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  • Other Sources  (1,287)
  • Elsevier  (922)
  • Taylor & Francis  (158)
  • AMS (American Meteorological Society)  (116)
  • Wiley-Blackwell  (65)
  • American Geophysical Union
  • Annual Reviews
  • Copernicus
  • 2005-2009  (826)
  • 1990-1994  (279)
  • 1985-1989  (124)
  • 1980-1984  (48)
  • 1960-1964  (10)
Collection
Publisher
Years
Year
  • 1
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    American Geophysical Union
    In:  J. Geophys. Res., Washington, D.C., American Geophysical Union, vol. 97, no. 8, pp. 11995-12013, pp. 2340, (ISSN: 1340-4202)
    Publication Date: 1992
    Keywords: Stress ; Fault plane solution, focal mechanism ; 16 ; (Structural ; Geology) ; 18 ; (Geophysics, ; Solid ; Earth) ; JGR ; California ; tectonophysics ; crust ; Indonesia ; structural ; geology ; neotectonics ; faults ; displacements ; active ; faults ; Pacific ; Coast ; Western ; U.S. ; United ; States ; San ; Andreas ; Fault ; Far ; East ; Asia ; Sumatra ; strike-slip ; faults ; borehole ; breakouts ; earthquakes ; focal ; mechanism ; plate ; tectonics
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  • 2
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    Elsevier
    In:  Signal Processing, Tokyo, Elsevier, vol. 8, no. 1, pp. 401-413, pp. L16603
    Publication Date: 1985
    Keywords: Spectrum ; Maximum likelihood
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  • 3
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    Unknown
    Elsevier
    In:  Amsterdam, Elsevier, vol. 3, pp. 6322, (ISBN 0-521-79203-7)
    Publication Date: 1990
    Keywords: Textbook of geophysics ; Seismics (controlled source seismology) ; Applied geophysics ; Vibroseis
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  • 4
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 14 B, pp. 225, (ISBN 3-7643-7011-4)
    Publication Date: 1984
    Keywords: Applied geophysics ; seismic Migration ; Seismics (controlled source seismology) ; Acoustics
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  • 5
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 3, pp. 6322, (ISBN 0-521-79203-7)
    Publication Date: 1989
    Keywords: Textbook of physics ; Textbook of geophysics ; Stress ; Boundary Element Method
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  • 6
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    American Geophysical Union
    In:  London, American Geophysical Union, vol. 1, no. 3, pp. 632 pp., (ISBN-10: 1-84628-053-2, ISBN-13:978-1-84628-053-5, eISBN 1-84628-054-0, xx + 591 pp. + CD-ROM)
    Publication Date: 1994
    Keywords: Seismology ; GeodesyY ; Synthetic seismograms
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  • 7
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    Elsevier
    In:  New York, Elsevier, vol. 138, no. 2, pp. 125-169, (ISBN 0-7923-5034-0)
    Publication Date: 1987
    Keywords: Borehole geophys. ; Textbook of geophysics
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  • 8
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    Elsevier
    In:  Amsterdam, 432 pp., Elsevier, vol. 167, no. XVI:, pp. 385-389, (ISBN 1-56670-263-3)
    Publication Date: 1994
    Keywords: 93.1060 ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Textbook of geophysics ; Plate tectonics ; Fracture ; Tectonics ; Geol. aspects ; Rheology ; Stress ; cracks and fractures (.NE. fracturing) ; salt
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  • 9
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    Elsevier
    In:  Amsterdam, 652 pp., Elsevier, vol. 39, no. XVI:, pp. 227-235, (0-444-51955-6)
    Publication Date: 1989
    Keywords: Borehole geophys. ; Textbook of geophysics ; Dual Induction Latero log
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  • 10
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    Unknown
    Elsevier
    In:  Amsterdam, Elsevier, vol. Developments in Petroleum Science vol. 15B, no. Publ. No. 12, pp. 9, (ISBN: 0-12-636380-3)
    Publication Date: 1986
    Keywords: Borehole geophys. ; Textbook of geophysics ; Tectonics ; Geol. aspects ; GFZ ; RUB ; GMG ; 3.45.8 ; UniL ; IfGuG ; in ; Französisch
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  • 11
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    Elsevier
    In:  Amsterdam, Elsevier, vol. Developments in Petroleum Science vol. 15A, no. Publ. No. 12, pp. 9, (ISBN: 0-12-636380-3)
    Publication Date: 1984
    Keywords: Borehole geophys. ; Textbook of geophysics ; GFZ ; RUB ; GMG ; 3.45.8 ; UniL ; IfGuG ; in ; Französisch
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  • 12
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 26, no. ALEX(01)-FR-77-01, AFTAC Contract F08606-76-C-0025, pp. 329, (ISBN: 0-08-043649-8)
    Publication Date: 1987
    Keywords: Seismology ; Seismics (controlled source seismology) ; Applied geophysics ; Layers
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  • 13
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    Elsevier
    In:  Amsterdam, 253 pp., Elsevier, vol. 10, no. 1, pp. 1-40, (ISBN: 3-540-23712-7)
    Publication Date: 1983
    Keywords: Textbook of geophysics ; Acoustics ; Seismics (controlled source seismology) ; Waves ; Wave propagation
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  • 14
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    American Geophysical Union
    In:  Washington, D.C., American Geophysical Union, vol. 6, no. 1, pp. 1-40, (ISBN: 0-444-51340-X)
    Publication Date: 1990
    Keywords: EUROPROBE (Geol. and Geophys. in eastern Europe) ; Handbook of geology ; Geol. aspects ; Plate tectonics
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  • 15
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    American Geophysical Union
    In:  Professional Paper, Earthquake Source Mechanics, Washington, D.C., American Geophysical Union, vol. 37, no. 16, pp. 275-283, (ISBN 0080419208)
    Publication Date: 1986
    Keywords: Spectrum ; Source parameters ; Seismology
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  • 16
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    American Geophysical Union
    In:  Professional Paper, Nonlinear Dynamics and Predictability of Geophysical Phenomena, Washington, American Geophysical Union, vol. 24, no. 231, pp. 7-13, (ISBN: 3-540-23712-7)
    Publication Date: 1994
    Keywords: Modelling ; Earthquake precursor: prediction research ; Earthquake precursor: statistical anal. of seismicity ; criticality ; Review article ; Chaotic behaviour ; FractureT
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  • 17
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    American Geophysical Union
    In:  Bull., Polar Proj. OP-O3A4, Nonlinear Dynamics and Predictability of Geophysical Phenomena, Washington, American Geophysical Union, vol. 1, no. 4, pp. 1-5, (ISBN 0080419208)
    Publication Date: 1994
    Keywords: Review article ; Non-linear effects ; Chaotic behaviour
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  • 18
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    Elsevier
    In:  Bull., Open-File Rept., Ground Motion and Engineering Seismology, Amsterdam, Elsevier, vol. 14, no. 86-425, pp. 231-241, (ISBN 0080419208)
    Publication Date: 1987
    Keywords: Seismology ; Strong motions
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  • 19
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    Elsevier
    In:  Bull., Open-File Rept., The Origin of Arcs, Amsterdam, Elsevier, vol. 65, no. 1, pp. 63-78, (ISBN 0080419208)
    Publication Date: 1986
    Keywords: Tectonics ; Geol. aspects ; Fault zone ; Plate tectonics
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  • 20
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    Elsevier
    In:  Advances in Geophysics, ed.: Renata Dmowska, Warszawa, Elsevier, vol. 47, no. 7, pp. 65-111, pp. L21303, (ISBN: 0-12-018847-3)
    Publication Date: 2005
    Keywords: Fault zone ; Rock mechanics ; Friction ; Fracture ; Physical properties of rocks ; geometry
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  • 21
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    Elsevier
    In:  Advances in Geophysics, ed.: Renata Dmowska, Heidelberg, Elsevier, vol. 47, no. 8, pp. 1-64, pp. 1516, (ISBN: 0-12-018847-3)
    Publication Date: 2005
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Subduction zone ; USA
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  • 22
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    Unknown
    American Geophysical Union
    In:  Washington, D.C., American Geophysical Union, vol. 96, pp. 225, (ISBN 0-471-95596-5)
    Publication Date: 1990
    Keywords: Nuclear explosion ; Textbook of geophysics ; Review article
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  • 23
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    Unknown
    Elsevier
    In:  Amsterdam, Elsevier, vol. 12, pp. 225, (ISBN 3-7643-7011-4)
    Publication Date: 1985
    Keywords: Textbook of geophysics ; Seismics (controlled source seismology) ; seismic Migration ; Acoustics ; Wave propagation ; Waves
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  • 24
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    Unknown
    Elsevier
    In:  Amsterdam, Elsevier, vol. 6, no. 16, pp. 220, (ISBN: 3540148477)
    Publication Date: 1989
    Keywords: Fracture ; Rock mechanics ; Elasticity
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  • 25
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 81A and 81B, no. 22, pp. 65-70, (1405101733, 336 p.)
    Publication Date: 1984
    Keywords: Textbook of geophysics ; Earth model, also for more shallow analyses !
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  • 26
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    Elsevier
    In:  Amsterdam, 566+XIII pp., Elsevier, vol. 65, no. ALEX(01)-FR-77-01, AFTAC Contract F08606-76-C-0025, pp. 95-104, (ISBN: 0-08-044051-7)
    Publication Date: 1986
    Keywords: Elasticity theory of dislocations ; Textbook of geophysics ; Dislocation
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  • 27
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    Elsevier
    In:  Amsterdam, 613 pp., Elsevier, vol. 52, no. ALEX(01)-FR-77-01, AFTAC Contract F08606-76-C-0025, pp. 95-104, (ISBN: 0-08-044051-7)
    Publication Date: 1987
    Keywords: Inversion ; Textbook of mathematics ; Textbook of geophysics
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  • 28
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 65, no. ALEX(01)-FR-77-01, AFTAC Contract F08606-76-C-0025, pp. 95-104, (ISBN: 0-08-044051-7)
    Publication Date: 1989
    Keywords: Textbook of geophysics ; Gravimetry, Gravitation ; Crustal deformation (cf. Earthquake precursor: deformation or strain)
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  • 29
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    Elsevier
    In:  Bull., Polar Proj. OP-O3A4, Signal Processing II: Theories and Applications, Bath, Elsevier, vol. 186, no. XVI:, pp. 689-692, (ISBN: 3-540-23712-7)
    Publication Date: 1983
    Keywords: Seismology ; Seismic arrays ; Spectrum ; Broad-band ; Data analysis / ~ processing ; f-k-Analysis ; Schuessler ; Schussler
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  • 30
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    Elsevier
    In:  Bull., Polar Proj. OP-O3A4, Signal Processing II: Theories and Applications, Leiden, Elsevier, vol. 11, no. XVI:, pp. 673-680, (ISBN: 3-540-23712-7)
    Publication Date: 1983
    Keywords: Seismology ; Seismics (controlled source seismology) ; Filter- ; Data analysis / ~ processing ; Schuessler ; Schussler
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  • 31
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    Elsevier
    In:  Bull., Polar Proj. OP-O3A4, Computer-aided Seismic Analysis and Discrimination, London, Elsevier, vol. 16, no. 4, pp. 97-109, (ISBN 0080419208)
    Publication Date: 1981
    Keywords: Group veloc. ; Velocity analysis
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  • 32
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    American Geophysical Union
    In:  Bull., Open-File Rept., Earthquake Source Mechanics, Washington, D.C., American Geophysical Union, vol. 37, no. 16, pp. 285-296, (ISBN 1-86239-165-3, vi + 330 pp.)
    Publication Date: 1986
    Keywords: Seismology ; Seismic networks ; Fracture ; Source
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  • 33
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 54, no. XVI:, pp. 9-66, (ISBN: 3486274473, 2. Auflage 2004, xxiv, 244 Seiten)
    Publication Date: 1992
    Keywords: FractureT ; Geol. aspects ; Seismicity ; Statistical investigations
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  • 34
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 1, no. 22, pp. 65-70, (ISBN 3-7643-0253-4)
    Publication Date: 1990
    Keywords: Seismology ; Textbook of geophysics
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  • 35
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    Elsevier
    In:  Amsterdam, I-VII + 329 pp., Elsevier, vol. 1, no. Publ. No. 12, pp. 127, (ISBN 3-540-44363-0)
    Publication Date: 1980
    Keywords: Geothermics ; application ; and ; prospection ; Earthquake hazard ; nuclear ; power ; plants ; Earthquake risk ; solar ; Energy (of earthquakes) ; pollution ; FROTH ; pp. ; 1-81, ; 279-288
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  • 36
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 20, no. Publ. No. 12, pp. 23-40, (ISBN 3935922167)
    Publication Date: 1986
    Keywords: Textbook of geophysics ; Data analysis / ~ processing ; Elasticity
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  • 37
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 65, no. ALEX(01)-FR-77-01, AFTAC Contract F08606-76-C-0025, pp. 95-104, (ISBN: 0-08-044051-7)
    Publication Date: 1993
    Keywords: Textbook of geophysics ; GeodesyY ; Geothermics ; Planetology ; ConvolutionE
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  • 38
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 2, no. 1, pp. 1-40, (ISBN 3-7643-6675-3)
    Publication Date: 1989
    Keywords: Textbook of geophysics ; Seismics (controlled source seismology) ; Applied geophysics ; Data analysis / ~ processing
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  • 39
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    American Geophysical Union
    In:  Earthquake Source Mechanics, Washington, D.C., American Geophysical Union, vol. 37, pp. 311-318, (ISBN 3-540-24988-5)
    Publication Date: 1986
    Keywords: Seismology ; Source ; Attenuation
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  • 40
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    Elsevier
    In:  Professional Paper, State of Stress in the Earth Crust, Amsterdam, Elsevier, vol. 146, no. 16, pp. 281-300, (ISBN 1-4020-1729-4)
    Publication Date: 1964
    Keywords: CRUST ; Tectonics ; Stress ; Strength ; Anisotropy ; ERYBACKI
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  • 41
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    Unknown
    American Geophysical Union
    In:  Bull., Polar Proj. OP-O3A4, Earthquake Source Mechanics, Washington, D.C., American Geophysical Union, vol. 37, no. 16, pp. 269-274, (ISBN: 3-540-23712-7)
    Publication Date: 1986
    Keywords: Seismology ; Green's function ; Source
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  • 42
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    American Geophysical Union
    In:  Bull., Polar Proj. OP-O3A4, Nonlinear Dynamics and Predictability of Geophysical Phenomena, Washington, American Geophysical Union, vol. 48, no. 4, pp. 37-41, (ISBN 0080419208)
    Publication Date: 1994
    Keywords: Dynamic ; Chaotic behaviour ; Non-linear effects
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  • 43
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    Elsevier
    In:  Bull., Polar Proj. OP-O3A4, Fractals in Physics, Amsterdam, Elsevier, vol. 24, no. 4, pp. 177-180, (ISBN 0080419208)
    Publication Date: 1986
    Keywords: Fracture ; FractureT
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  • 44
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    Elsevier
    In:  Bull., Polar Proj. OP-O3A4, The Origin of Arcs, Amsterdam, Elsevier, vol. 13, no. Subvol. a, pp. 93-113, (ISBN 0080419208)
    Publication Date: 1986
    Keywords: CRUST ; earth mantle ; Plate tectonics ; Muller
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  • 45
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    Elsevier
    In:  Amsterdam, Elsevier
    Publication Date: 1980
    Keywords: Seismology ; Seismics (controlled source seismology) ; Wave propagation ; Waves ; Textbook of geophysics
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  • 46
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 1, pp. 225, (ISBN 3-7643-7011-4)
    Publication Date: 1987
    Keywords: Textbook of geophysics ; Applied geophysics ; Seismics (controlled source seismology)
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  • 47
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    Elsevier
    In:  Amsterdam, 652 pp., Elsevier, vol. 39, no. XVI:, pp. 227-235, (0-444-51955-6)
    Publication Date: 2005
    Keywords: Seismics (controlled source seismology) ; Applied geophysics ; Wave propagation ; plane ; spherical ; and ; cylindrical ; Waves ; in ; isotropic ; and ; transversely ; isotropic ; solids, ; liquid-solid ; models, ; and ; media ; with ; cylindrical ; inclusions ; (boreholes) ; Textbook of geophysics
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  • 48
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 16, no. 22, pp. 662-664, (ISBN 0-470-87000-1 (HB), ISBN 0-470-87001-X (PB))
    Publication Date: 1987
    Keywords: Surface waves ; Seismology ; Textbook of geophysics ; Wave propagation
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  • 49
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 16, no. 1, pp. 662-664, (ISBN 0-470-87000-1 (HB), ISBN 0-470-87001-X (PB))
    Publication Date: 1988
    Keywords: Textbook of geology ; Tectonics ; Fault zone ; Stress ; Fracture ; Engineering geophys.
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  • 50
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    American Geophysical Union
    In:  Washington, 107 pp., American Geophysical Union, vol. IUGG Volume 18, no. 85, pp. 799-804, (ISBN 3-540-23219-2)
    Publication Date: 1994
    Keywords: Non-linear effects ; FractureT ; Chaotic behaviour ; SOC ; criticality ; Textbook of geophysics ; Dynamic ; Earthquake precursor: prediction research
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  • 51
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    Elsevier
    In:  Amsterdam, Elsevier, vol. 31, no. 1, pp. 1-40, (ISBN 0-691-01019-6)
    Publication Date: 1994
    Keywords: Textbook of geophysics ; Geoelectrics ; Applied geophysics
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  • 52
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    American Geophysical Union
    In:  Earthquake Source Mechanics, Washington, D.C., American Geophysical Union, vol. 37, pp. 259-267, (ISBN 3-540-24988-5)
    Publication Date: 1986
    Keywords: Seismology ; Source parameters ; Seismicity
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  • 53
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    American Geophysical Union
    In:  Earthquake Source Mechanics, Washington, D.C., American Geophysical Union, vol. 37, no. 16, pp. 195-207, (ISBN 0080419208)
    Publication Date: 1986
    Keywords: Source parameters ; Fault zone ; Inelastic ; Creep observations and analysis ; Source ; Earthquake precursor: prediction research
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  • 54
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    American Geophysical Union
    In:  Nonlinear Dynamics and Predictability of Geophysical Phenomena, Washington, American Geophysical Union, vol. 22, no. 16, pp. 69-74, (ISBN 0080419208)
    Publication Date: 1994
    Keywords: SOC ; Chaotic behaviour ; Non-linear effects ; Earthquake precursor: prediction research ; Earthquake precursor: statistical anal. of seismicity
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  • 55
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    American Geophysical Union
    In:  Professional Paper, Properties and Processes of the Earth's Lower Crust, Oxford, American Geophysical Union, vol. 54, no. 16, pp. 197-213, (ISBN 1-4020-1729-4)
    Publication Date: 1989
    Keywords: CRUST ; Geothermics ; Inelastic ; Muller
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  • 56
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    American Geophysical Union
    In:  Professional Paper, Nonlinear Dynamics and Predictability of Geophysical Phenomena, Washington, American Geophysical Union, vol. 65, no. 16, pp. 15-35, (ISBN: 3-540-23712-7)
    Publication Date: 1994
    Keywords: Non-linear effects ; Friction ; Fracture ; Physical properties of rocks
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  • 57
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    Elsevier
    In:  Bull., Polar Proj. OP-O3A4, Continental Lower Crust, Amsterdam, Elsevier, vol. 4, no. Subvol. b, pp. 45, (ISBN 0080419208)
    Publication Date: 1992
    Keywords: Reflectivity ; Review article ; Reflection seismics ; CRUST ; Meissner
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  • 58
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    American Geophysical Union
    In:  Professional Paper, Open-File Rept., Nonlinear Dynamics and Predictability of Geophysical Phenomena, Washington, American Geophysical Union, vol. 4, no. 2, pp. 55-60, (ISBN 0080419208)
    Publication Date: 1994
    Keywords: Earthquake precursor: prediction research ; Non-linear effects ; Earthquake precursor: stresses ; Modelling ; Stress
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  • 59
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    Elsevier
    In:  Bull., Open-File Rept., Continuum Theories in Solid Earth Physics, Amsterdam, 566+XIII pp., Elsevier, vol. 186, no. 16, pp. 18-186, (ISBN 0080419208)
    Publication Date: 1986
    Keywords: Elasticity theory of dislocations ; Dislocation ; Review article
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  • 60
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    Elsevier
    In:  Bull., Open-File Rept., Signal Processing II: Theories and Applications, Orlando, Elsevier, vol. 37, no. 16, pp. 681-684, (ISBN 1-86239-165-3, vi + 330 pp.)
    Publication Date: 1983
    Keywords: Detectors ; Seismic arrays ; Seismology ; Schuessler ; Schussler
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  • 61
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    American Geophysical Union
    In:  Professional Paper, Open-File Rept., Nonlinear Dynamics and Predictability of Geophysical Phenomena, Washington, American Geophysical Union, vol. 3, no. 16, pp. 43-53, (ISBN 1-86239-165-3, vi + 330 pp.)
    Publication Date: 1994
    Keywords: Earthquake ; Dynamic ; Seismicity ; Hypocentral depth
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  • 62
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    Elsevier
    In:  Professional Paper, Open-File Rept., Thermodynamics of Point Defects and the Relation with Bulk Properties, New York, Elsevier, vol. 1, no. 16, pp. 410-412, 417-420, (ISBN 0080419208)
    Publication Date: 1986
    Keywords: Geomagnetics ; Earthquake precursor: prediction research ; Earthquake precursor: magnetic ; Geoelectrics ; Physical properties of rocks
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  • 63
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    American Geophysical Union
    In:  Professional Paper, Open-File Rept., Nonlinear Dynamics and Predictability of Geophysical Phenomena, Washington, American Geophysical Union, vol. 4, no. 2, pp. 75-80, (ISBN 0080419208)
    Publication Date: 1994
    Keywords: Chaotic behaviour ; Friction
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  • 64
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    American Geophysical Union
    In:  Bull., Open-File Rept., Nonlinear Dynamics and Predictability of Geophysical Phenomena, Washington, American Geophysical Union, vol. 5, no. 16, pp. 81-89, (ISBN 1-86239-165-3, vi + 330 pp.)
    Publication Date: 1994
    Keywords: Modelling ; Earthquake precursor: prediction research ; Earthquake precursor: models ; Chaotic behaviour
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  • 65
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    Elsevier
    In:  Fisheries Research, 8 (1). pp. 35-44.
    Publication Date: 2017-01-10
    Description: In Moreton Bay, Queensland, the catch obtained using monofilament polyamide (PA) otter trawl-nets with multifilament polyethylene (PE) cod ends was compared with that obtained using multifilament PE trawl-nets of identical mesh opening (38 mm). Monofilament PA otter trawl-nets retained fewer small prawns ( 〈 24 mm carapace length) than conventional multifilament PE nets, but both nets caught similar quantities of larger prawns ( 〉 24 mm carapace length). The higher retention rate of small prawns by multifilament PE gear was reflected in the greater catch weights of Peraeus plebejus, Metapenaeus bennettae and Metapenaeopsis novaeguineae in those nets. Catch weights of larger prawn species such as Penaeus esculentus and Metapenaeus endeavouri did not differ between nets. Winter whiting (Sillago maculata) and squid (Loligo spp.) were trawled in similar abundance in both nets, although the monofilament retained fewer squid 〈 50 mm mantle length. More marketable ( 〉 15 cm carapace width) sand crabs (Portunus pelagicus) were caught in the monofilament net. There was not significant difference in the trash (noncommercial component) weight caught in both nets. Over the range of towing speeds tested (1.7–2.3 kn), use of monofilament nets significantly reduced total gear drag.
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  • 66
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    Taylor & Francis
    In:  South African Journal of Marine Science, 9 (1). pp. 11-26.
    Publication Date: 2020-05-26
    Description: The biology of the chokker squid Loligo vulgaris reynaudii on inshore grounds in the South-East Cape was studied by examination of trends in jig catches, length frequency analyses, length/weight relationships, analyses of maturity stages and SCUBA diving transects in a spawning area. Commercial catches probably reflected the influx of squid into shallow waters to spawn. Modal length at spawning was between 265 and 305 mm mantle length (ML) in males and between 175 and 195 mm ML in females. There was no modal progression to indicate growth, nearly all squid were mature, a percentage of males were spent, the level of feeding on the grounds was very low, and mantle walls were thinner than those of squid offshore. These factors all indicate that the squid population inshore had reached the end of its life cycle and was in the spawning phase. The sex ratio was biased towards males, an indication either of differential inshore migration or of greater longevity in males than in females. The frequency of occurrence of trawled egg capsules was highest in summer and all eggs were between 18 and 25 m deep. The preferred substratum for spawning appeared to be low-relief reef interspersed with coarse sand, and the stalks of egg capsules were always embedded in the sand to form individual clusters, as in most other loliginids. No evidence was found of post-spawning mortality in the areas examined.
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  • 67
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    Taylor & Francis
    In:  Invertebrate Reproduction & Development, 19 (1). pp. 13-24.
    Publication Date: 2017-02-01
    Description: Oogenesis in four commercial Caribbean sponge species, Hippospongia lachne, Spongia barbara, S. cheiris and S. graminea, was studied using light and transmission electron microscopy. Eggs and embryos develop asynchronously in localized endosomal nurseries of these viviparous and gonochoristic species. Statistical analyses of specific morphological characteristics of reproductive elements have unequivocally identified four specific stages in the process of oogenesis. Oogonia undergo mitotic division to produce primary oocytes. Meiotic division occurs producing secondary oocytes which are fertilized before zygotes undergo major growth by phagocytosis and the transfer of nutrients through cytoplasmic bridges. During cleavage of the zygote, umbilici form between embryos and nurse cell layers and these function in the transfer of symbiotic bacteria and other mesohyl substances from the maternal parent to the embryo. These symbionts were observed dispersed between blastomeres of all young and maturing embryos and between internal cells of cytodifferentiated parenchymella larvae. Extracellular transfer of symbiotic bacteria from maternal tissues to developing embryos has not been reported in any other viviparous invertebrate.
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  • 68
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    Taylor & Francis
    In:  New Zealand Journal of Marine and Freshwater Research , 25 . pp. 275-282.
    Publication Date: 2020-06-22
    Description: Before 1985, Martialia hyadesi (Cephalopoda: Ommastrephidae) in the Pacific Ocean was known only from the Eltanin Fracture Zone and Macquarie Island. A joint Japan‐New Zealand squid survey around New Zealand captured many immature ommastrephid squids. Gel electrophoresis confirmed the presence of immature M. hyadesi. Aspects of the external morphology are described. The distinctive tentacle club was evident in the smallest specimen examined, 19 mm dorsal mantle length (ML). Arm trabeculae were first evident in specimens of 40–50 mm ML. Immature squid were distributed around and southward of the Subtropical Convergence Zone. The presence of very small squid (〈 10 mm ML) indicated spawning on or near the Auckland Island Shelf.
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  • 69
    Publication Date: 2020-07-31
    Description: Distribution and abundance of the horned octopus Eledone cirrhosa in the Tyrrhenian Sea are described on the basis of stratified-random bottom trawl surveys in spring and summer of the years 1985–1987. Specimens were caught between 25 and 630 m depth (higher densities between 50 and 200 m depth); mature males were found to prefer deeper bottoms than mature females. Young specimens occurred in spring samples from the Western Ligurian Sea and in summer samples from the Lower Tyrrhenian Sea, but were scarcely represented in the Higher Tyrrhenian Sea. Thus recruitment seems to be progressively delayed later in the season from north to south. The greatest abundance was recorded in the Higher Tyrrhenian Sea; wide seasonal variations of minimum stock biomass estimates have been observed and total biomass decreased from 1985 to 1987 in the surveyed areas.
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  • 70
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    Wiley-Blackwell
    In:  Journal of Zoology, 214 (2). pp. 189-197.
    Publication Date: 2020-07-17
    Description: The cuttlefish ingests much skeleton from the crustaceans and fish it preys upon. The skeletal pieces are relatively large and their dimensions bear a close relationship to the length of the buccal mass and diameter of the oesophagus. The structures of the buccal mass are instrumental in the breakdown of prey and orientation of long pieces of skeleton to ensure their entry into the oesophagus. Many pieces of skeletal material present in the stomach contents still have attached muscles, showing that there is little, or no, external digestion. Skeletal material may be important for long-term maintenance of young Sepia in captivity.
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  • 71
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    Wiley-Blackwell
    In:  Journal of Zoology, 179 (3). pp. 291-295.
    Publication Date: 2020-07-17
    Description: The cartilaginous tubercles of the mantle of the squid Cranchia scabra have been examined with the scanning electron microscope. Some tubercles are small, simple nodules whereas others are large with a complex Maltese cross form. The varying shapes and sizes probably represent a developmental sequence. The possible role of the tubercles is discussed.
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  • 72
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    Taylor & Francis
    In:  Journal of the Royal Society of New Zealand, 22 (4). pp. 243-263.
    Publication Date: 2020-07-16
    Description: The beaks of 9,994 cephalopods of 61 species, obtained mainly from chick regurgitations of wandering albatrosses (Diomedea exulans L.) at Gough, Auckland, Antipodes, Prince Edward and Macquarie Islands and South Georgia, were used to specify and calculate the biomass of cephalopods consumed. Histioteuthidae were most important by numbers and biomass at Gough Island (in warmest seas), but Onycboteuthidae increasingly superseded them southwards; Kondakovia longimana formed 59 to 75% of biomass eaten at the three localities nearest the Antarctic Polar Front. Other important families were Octopoteuthidae, Cranchiidae, Architeuthidae (juveniles) and Ommastrephidae (South Georgia only). Most frequently eaten were Histioteuthis atlantica 13.7%, Galiteuthis glacialis 12.4%, H. eltaninae 12.0% and Kondakovia longimana 11.6%. Wandering albatrosses rearing chicks can forage at least to 3,000 km in a single foray, and may exploit an important food source about 1200 km from the nest (as in the probable commensalism of South Georgian birds with the Falkland Islands fishery). They feed, sometimes opportunistically, on cephalopods active or moribund at the surface, or discarded or lost by trawlers, cetaceans or seals. Vertically migrating cephalopods, especially bioluminescent species, are disproportionately frequent in their non-commensal diet, suggesting that they often feed at night.
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  • 73
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    Taylor & Francis
    In:  New Zealand Journal of Zoology, 13 (2). pp. 169-174.
    Publication Date: 2020-06-22
    Description: Food samples from 27 Buller’s mollymawks Diomedea bulleri from the New Zealand region showed that cephalopods were, by frequency of occurrence and by mass, their preferred food. Fish, crustaceans, and tunicates, in decreasing order of importance, also were taken. Seventeen species of Cephalopoda were identified by their beaks, with 78.5% of individuals belonging to the Ommastrephidae (77% Nototodarus spp.) and 10% to the Histioteuthidae. The diet was compared with that of four other small species of Diomedea, and found to be similar to that of D. chrysostoma, D. irrorata, and D. cauta, but different from that of D. melanophris, whose preferred food is euphausiids. Squid-fishing operations around New Zealand may come into competition with Buller’s mollymawk.
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  • 74
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    Taylor & Francis
    In:  South African Journal of Marine Science, 12 (1). pp. 225-235.
    Publication Date: 2020-05-26
    Description: A link is proposed between the processes that led to the evolution of large species of squid and the highly variable, cyclic recruitment seen in squid fisheries. Maximum growth requires maximal feeding and minimal routine metabolism at optimum temperatures, which decrease as squid grow. Topographically induced upwelling zones, inshore of western boundary currents, provide productive environments with appropriate temperatures for all life stages. Most squid are small and live in the tropics or subtropics; locomotor constraints prevent them from swimming long distances. Long annual migrations to spawn upstream in current systems require short-lived squids to maximize rates of growth. Therefore, such systems provide the opportunity and a powerful selective advantage for large size and rapid growth. Increased fecundity and cannibalism provide additional directional selection for large individuals. Current systems show food production peaks (blooms); paralarval release must match these to increase survival. Because squid are semelparous, disruption of delicately balanced lifecycles by physical events can virtually annihilate stocks. Recovery probably requires that populations of large squid "re-evolve" from smaller, more-stable tropical populations of small squid. This recovery phase may extend the "down-side" of abundance cycles. Studies of squid/current systems have focused on western boundary currents, but the Illex complex also associates with eastern boundaries. Such populations are generally smaller than in larger systems, supporting the hypothesis, but more detailed comparisons are required.
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  • 75
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    Taylor & Francis
    In:  South African Journal of Marine Science, 12 (1). pp. 739-752.
    Publication Date: 2020-05-26
    Description: During a cruise in March 1988 dedicated to investigation of the marine resources of South Africa's continental slope, 62 species in 22 families of Cephalopoda were collected from the Cape Canyon and Cape Point Valley. Multivariate analysis revealed a clear distinction between cephalopods of the upper and lower continental slope in both benthic and epibenthic habitats. Todaropsis eblanae and Todarodes angolensis were indicator species for the upper slope benthic, from 300 to 500 m, but on the lower slope, in 700–900 m of water, they were replaced by Histioteuthis miranda and Opisthoteuthis agassizii. In the epibenthic, both upper and lower slopes were dominated by Abraliopsis gilchristi and Lycoteuthis ?diadema, but other species characteristic of the lower slope were the oceanic species Mastigoteuthis hjorti, Ctenopteryx sicula and Taonius sp. A. Cranchia scabra indicated the presence of oceanic water at stations 700–900 m deep. Other species of significance in the catches were Todarodes filippovae, Histioteuthis macrohista, Rossia enigmatica and Bathypolypus valdiviae. Species affinities indicate that the cephalopod fauna of the southern African continental slope includes the following zoogeographic components: southern African endemic, circum-Subantarctic species associated with Antarctic Intermediate Water, circum-global southern tropical/subtropical, tropical Indo-Pacific and cosmopolitan tropical/subtropical.
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  • 76
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    Taylor & Francis
    In:  South African Journal of Marine Science, 12 (1). pp. 651-662.
    Publication Date: 2020-05-26
    Description: Literature on trophic relationships in the Benguela ecosystem has stressed the importance of cephalopods as prey of groundfish. The groundfish community of the shelf and upper slope of southern Africa is dominated by the Cape hakes, and the results presented (1984–1991) confirm that both species of hake are important predators of cephalopods, especially taking into consideration the abundance of hake in the ecosystem. However, geographic, seasonal and species variability are evident in the patterns observed. The main prey species are Sepia spp. (predominantly Sepia australis), Loligo vulgaris reynaudii, Todaropsis eblanae and Lycoteuthis ?diadema. The last-named is an important food organism for fish. Its systematic status needs revision, however. Qualitative results of studies of cephalopod predation are also provided for kingklip and monkfish.
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  • 77
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    Taylor & Francis
    In:  South African Journal of Marine Science, 12 (1). pp. 791-802.
    Publication Date: 2020-05-26
    Description: Cephalopods of importance in the Benguela ecosystem include Loligo vulgaris reynaudii, Todarodes angolensis, Todaropsis eblanae, Lycoteuthis ?diadema, Sepia australis, Octopus spp. (up to three species) and Argonauta spp., and possibly also Ocythoe tuberculata and Rossia enigmatica. Species which may prove important as a result of further research are Lolliguncula mercatoris, Ommastrephes bartramii, Todarodes filippovae, Histioteuthis miranda and Abraliopsis gilchristi. "Importance" is defined on the basis of "survey abundance" (including commercial fisheries) and their trophic links with other organisms. Use of the latter criterion indicates that Sepia australis, Todaropsis eblanae and Lycoteuthis ?diadema are sufficiently abundant to be exploited by fisheries. Unknown factors are dispersal, availability and market considerations. The only examples of cephalopods feeding on commercial species of fish are Loligo v. reynaudii feeding on anchovy Engraulis capensis and Cape hakes Merluccius capensis and/or M. paradoxus in the southern Benguela and Todarodes angolensis preying on Cape hake in the northern Benguela. Such feeding is opportunistic and is not believed to threaten the fish stocks. Predators of cephalopods are mostly opportunistic, switching to other prey when cephalopods are not available. There is no evidence that such predators pose a threat to the Loligo fisheries. The opportunistic nature of cephalopods as prey and predators makes quantification of predation (in both directions) difficult. Data for such quantification are, as yet, unavailable.
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  • 78
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    Taylor & Francis
    In:  Journal of Natural History, 27 (1). pp. 15-46.
    Publication Date: 2020-07-21
    Description: The present study contributes new information on the cephalopods off Namibia, contains the first record of Ornithoteuthis volatilis (Sasaki, 1915) in the Atlantic, and adds records of six species in the Benguela Current and three species in Namibian waters. The presence of certain species seldom encountered in the Benguela Current has been confirmed. A compilation of the cephalopod fauna off Namibia had also been included, listing 65 species. Additional morphological data on Stoloteuthis leucoptera, Lycoteuthis lorigera, Architeuthis sp., Pholidoteuthis boschmai, Ornithoteuthis volatilis, Eledone nigra, and Graneledone sp. have been provided. The status of the genus Lycoteuthis has been reviewed in the light of the first collection of Lycoteuthis lorigera (Steenstrup, 1875) males in the Atlantic, and Lycoteuthis diadema (Chun, 1900) has been considered to be a synonym for Lycoteuthis lorigera
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  • 79
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    Taylor & Francis
    In:  South African Journal of Marine Science, 12 (1). pp. 927-941.
    Publication Date: 2020-05-26
    Description: The results of ichthyoplankton surveys carried out by the Instituto Nacional de Pesca (INAPE) in the Argentine–Uruguayan Common Fishing Zone (AUCFZ) in summer 1980 and the winters of 1980–1982 are presented. In addition, the results of joint research with INIDEP, the Argentine and Japan Fisheries Agency, on larvae, juveniles and adults of the short-finned squid Illex argentinus carried out in winter 1989 are given, as are data obtained during the joint sardine and anchovy recruitment project carried out by R.V. Meteor in November/December 1989. The short-finned squid Illex argentinus is the most important cephalopod resource of the area, and an extended fishery is carried out on the Patagonian shelf and in the proximity of the Falkland Islands. The fishing season in the AUCFZ, for pre-spawning and spawning animals, extends from early autumn to winter (March–August). Abundance of rhynchoteuthion larvae (417–485 larvae·10 m−2) was greatest in winter in surface temperatures of 12,1–16,9°C and surface salinities of 34,8 – 35,2 × 10−3. The distribution of the larvae is related to the western boundary of the Brazil Current and the convergence front.
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  • 80
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    Taylor & Francis
    In:  South African Journal of Marine Science, 12 (1). pp. 903-918.
    Publication Date: 2020-05-26
    Description: The question whether the chokka squid Loligo vulgaris reynaudii resource can be managed effectively is examined in the light of developments in the fishery and knowledge of the resource gathered in recent years. The history of the fishery since its inception in 1985, management controls and the current state of knowledge of stock identity, distribution, seasonality and abundance, life cycle and population dynamics are reviewed as a background to a discussion of management alternatives. Long-term measures, such as fleet limitation, seasonal closures and de facto closed areas and size limits, all appropriate in the early stages of a fishery when knowledge is limited, should be replaced by more-flexible alternatives as knowledge improves. Methods of stock assessment, stock-recruitment studies and further basic biological analyses are recognized as being crucial to improving management methods. An explanation embracing physical oceanographic features and plankton productivity in the vicinity of the spawning grounds is advanced for the mechanisms underlying hatchling survival. The possible contribution of trophic studies to squid management is recognized. Effective management of the chokka squid resource is concluded to be possible provided that the specific areas needing attention be addressed by means of goal-orientated research. Rational, but not necessarily optimal, management decisions can, however, be made even in the absence of stock-recruitment data, by the employment of common-sense measures which generally include some form of effort control.
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  • 81
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    Wiley-Blackwell
    In:  Journal of Zoology, 224 (3). pp. 431-477.
    Publication Date: 2020-07-17
    Description: Three specimens of the rare giant squid (genus Architeuthis, 18 nominal species) are described from the waters around southern Africa. Consideration of their internal and external morphology, including beaks, radula, statocyst and statolith give no reason to suppose that the three specimens do not pertain to the same species. A standardized data collection form and a summary of existing morphometric data are presented for the first time and the morphology and systematics of the genus are discussed. The value of various systematic characters is examined and certain guidelines are proposed, with an appeal for a more scientific approach to Architeuthis studies. Features of the internal anatomy, including the female reproductive tract, are described and illustrated and the beak dimensions are used to evaluate existing regression formulae for beak and body parameters. The statocyst and statolith are described and illustrated in full, the statolith for the first time, and are compared with those of other squids. The value of recent data from trawl-caught specimens, as well as indirect evidence, is cited to replace speculation in discussions on distribution and habitat. Our specimens suggest that the waters off the south-western coast of Africa may be one of the natural habitats of Architeurhis, during both feeding and spawning periods of the life cycle.
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  • 82
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    Elsevier
    In:  Journal of Experimental Marine Biology and Ecology, 163 (2). pp. 261-276.
    Publication Date: 2017-03-29
    Description: An investigation was carried out on the morphology, growth and microstructure of statoliths of 833 specimens of Sthenoteuthis pteropus (Steenstrup) mantle length (ML): 2–548 mm collected in the open waters of the Gulf of Guinea in 1984–1988. Statolith morphology is similar to that of other species of the subfamily Ommastrephinae and is similar to the sibling species S. oulaniensis. Statolith development includes five stages resembling those of Illex illecebrosus and other ommastrephids. Statolith growth is characterized by negative allometry. Increments visible in ground sections of statoliths can be grouped into four main growth zones, differing mainly in colour and increment width. Age and growth rates of S. pteropus were calculated using increment counts. The life span of females of all size groups does not exceed 1 yr, that of males is 1–2 months shorter, probably due to preliminary mating. Instantaneous relative growth rage (G) of paralarvae is high (up to 16% of body weight (BW)). G values for juveniles decline, but remain relatively high (7–8% BW). Juveniles attain 100–110 mm ML by age 100–110 days. G values for adults are the lowest (1.8–2% BW), but daily growth rates reach maximum values (40–70 g per day in large females of 450–500 mm ML). Each ontogenetic phase of S. pteropus corresponds to features of morphology, growth and microstructure of the statolith.
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  • 83
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    Wiley-Blackwell
    In:  Journal of Quaternary Science, 23 (1). pp. 3-20.
    Publication Date: 2017-04-06
    Description: Investigations indicate that the Iceland Ice Sheet was reduced in size during MIS 3 but readvanced to the shelf break at the LGM. Retreat occurred very rapidly around 15 k–16 k cal. yr BP. By contrast, the margin of the ice sheet on the East Greenland shelf, north of the Denmark Strait, was at or close to the shelf break during MIS 3 and 2 and retreat starting ∼17 k cal. yr BP. Quantitative X-ray diffraction analysis of the 〈2 mm sediment fraction was undertaken on 161 samples from Iceland and East Greenland diamictons, and from cores on the slopes and margins of the Denmark Strait. Weight% mineralogical data are used in a principal component analysis to differentiate sediments derived from the two margins. The first two PC axes explain 52% of the variance. These associations are used to characterise sediments as being affiliated with (a) Iceland, (b) East Greenland or (c) mixed. The contribution from Iceland becomes prominent during MIS 2. The extensive outcrop of early Tertiary basalts on East Greenland between 68° and 71° N is an alternative source for basaltic clasts and North Atlantic sediments with εNd(0) values close to ±0.
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  • 84
    Publication Date: 2020-05-14
    Description: The volcanic arc of the Hellenic subduction zone with its four volcanic centers is of major relevance when evaluating the seismovolcanic hazard for the Aegean region. We present results from a 22-station temporary seismic network (CYCNET) in the central Hellenic Volcanic Arc (HVA). CYCNET recordings allow to analyze the level and spatio-temporal evolution of microseismic activity in this region for the first time. A total of 2175 events recorded between September 2002 and July 2004 are analyzed using statistical methods, cluster analysis and relative relocation techniques. We identify distinct regions with significantly varying spatiotemporal behavior of microseismicity. A large portion of the seismic activity within the upper crust is associated with the presence of islands representing horst structures that were generated during the major Oligocene extensional phase. In contrast, the central part of the Cyclades metamorphic core complex remains aseismic considering our magnitude threshold of 1.8 except one spot where events occur swarm-like and with highly similar waveforms. The highest activity in the study area was identified along the SW–NE striking Santorini–Amorgos zone. Within this zone the submarine Columbo volcano exhibits strong temporal variations of seismic activity on a high background level. This activity is interpreted to be directly linked to the magma reservoir and therein the migration of magma and fluids towards the surface. NE of Columbo where no volcanic activity has yet been reported we observe a similar seismicity pattern with small-scaled activity spots that might represent local pathways of upward migrating fluids or even developing volcanic activity within this zone of crustal weakness. In contrast, the Santorini and Milos volcanic complexes do not show significant temporal variations and low to moderate background activity, respectively. Relating our results to the distribution of historical earthquakes and the GPS-derived horizontal velocity field we conclude that the Santorini–Amorgos zone is presently in the state of right-lateral transtension reflecting a major structural boundary of the volcanic arc subdividing it into a seismically and volcanically quiet western and an active eastern part.
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  • 85
    Publication Date: 2020-06-03
    Description: Mean intracellular pH (pHi) and PCO2 (PiCO2) have been analysed based on pH and total CO2 measurements in tissue homogenates. Tissues were sampled from undisturbed worms (Sipunculus nudus), squid (Illex illecebrosus), trout (Salmo gairdneri), toads (Bufo marinus), and rats. Homogenate metabolism was inhibited by the addition of potassium fluoride and nitrilotriacetic acid (NTA). Model calculations revealed that the influence of dilution, medium buffers, and contamination by extracellular fluids was negligible. In white muscle tissue the resulting pHi values were virtually the same as found in studies using DMO (dimethyloxazolidinedione). If large fractions of mitochondria were present (e.g. in heart muscle), DMO derived pHi values were considerably higher, probably representing overestimates. Homogenate derived pHi values are concluded to represent the effective mean pHi by taking into account pH gradients, and the volumes and buffering of cellular compartments. High time resolution and small variability make this method especially useful to assess rapid changes in pHi, e.g. in exercising animals.
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  • 86
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    Elsevier
    In:  Deep Sea Research and Oceanographic Abstracts, 11 (1). pp. 113-126.
    Publication Date: 2017-05-12
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  • 87
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    Elsevier
    In:  Journal of Experimental Marine Biology and Ecology, 177 (1). pp. 73-78.
    Publication Date: 2020-07-27
    Description: The periodicity of deposition of growth increments in the cuttlebone of juvenile Sepia officinalis was investigated under controlled conditions for a short period after hatching (19 days). The slope of time elapsed and increment counts was significantly different from 1 indicating that lamellae are not deposited on a daily basis. The relationship between increment counts and juvenile length was, however, highly significant. Also significant were the relationships between the number of growth increments and shell length and increment counts and cuttlebone area. These data show that the number of growth increments is related primarily to the growth rate of the juvenile rather than to its chronological age. Taking into account these data, the cuttlebone lamellae cannot be used for age determination in the juvenile cuttlefish just after hatching.
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  • 88
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    Elsevier
    In:  Organic Geochemistry, 39 (8). pp. 1000-1006.
    Publication Date: 2017-06-26
    Description: The anaerobic oxidation of methane (AOM), by converting methane to bicarbonate which is then precipitated as extensive carbonate crusts, is an important methane sink in the Earth’s ocean systems. Here we employ a multidisciplinary approach to investigate the role of microorganisms in carbonate precipitation using biomarker analysis, scanning electron microscopy (SEM) and X-ray diffraction. We examined two microbial mats from the Black Sea and found that one comprised carbonate in both aragonite and Mg calcite forms and most likely ANME-1 archaea, whereas the other contained only Mg calcite and most likely ANME-2 archaea. We conclude, as have others, that the different microbial communities could impart different influences on carbonate mineralogy and morphology. Although further research is needed, this is a contribution to our understanding of those relationships, which could prove critical in the interpretation of ancient sedimentary deposits.
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  • 89
    Publication Date: 2017-06-27
    Description: There is growing concern about the transfer of methane originating from water bodies to the atmosphere. Methane from sediments can reach the atmosphere directly via bubbles or indirectly via vertical turbulent transport. This work quantifies methane gas bubble dissolution using a combination of bubble modeling and acoustic observations of rising bubbles to determine what fraction of the methane transported by bubbles will reach the atmosphere. The bubble model predicts the evolving bubble size, gas composition, and rise distance and is suitable for almost all aquatic environments. The model was validated using methane and argon bubble dissolution measurements obtained from the literature for deep, oxic, saline water with excellent results. Methane bubbles from within the hydrate stability zone (typically below 500 m water depth in the ocean) are believed to form an outer hydrate rim. To explain the subsequent slow dissolution, a model calibration was performed using bubble dissolution data from the literature measured within the hydrate stability zone. The calibrated model explains the impressively tall flares (〉1300 m) observed in the hydrate stability zone of the Black Sea. This study suggests that only a small amount of methane reaches the surface at active seep sites in the Black Sea, and this only from very shallow water areas (〈100 m). Clearly, the Black Sea and the ocean are rather effective barriers against the transfer of bubble methane to the atmosphere, although substantial amounts of methane may reach the surface in shallow lakes and reservoirs.
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  • 90
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    Taylor & Francis
    In:  Israel Journal of Zoology, 39 (4). pp. 299-336.
    Publication Date: 2017-08-10
    Description: During the years 1989–1993 an intensive collection of fishes from the aphotic zone (below 150 m) of the northern part of the Gulf of Aqaba was conducted. This survey recorded 69 fish species, 8 elasmobranchs, and 61 teleosts, belonging to 45 families. Fifteen species are endemic to the Red Sea: Mustelus mosis, Narcine bentuviai, Rhinobatos punctifer, Ophichthus echeloides, Rhynchoconger sp., Physiculus marisrubri, Ostichthys hypsipterygion sufensis, Pterygotrigla sp., Uranoscopus marisrubri, Parascolopsis sp.1 and sp. 2, Atrobucca geniae, Chromis pelloura, Samariscus sp., Thamnaconus modestoides erythraeensis. Eleven species are new records for the Red Sea: Gymnothorax johnsoni, Rhynchoconger sp., Synodus doaki, Pterygotrigla sp., Chelidoperca pleurospilus, Carangoides equula, Parascolopsis sp. 1 and sp. 2, Bodianus leucostictus, Paracaesio sordidus, and Samariscus sp. Two species, Cociella crocodilo and Parascolopsis eriomma, are first substantiated records for the Red Sea. None of the species recorded in this list is considered conventional deep-sea fishes. The ichthyofauna of the aphotic zone of the Gulf of Aqaba is composed of species of shallower origin.
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  • 91
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    Taylor & Francis
    In:  Beitrage zur Neotropischen Fauna, 4 (1). pp. 1-44.
    Publication Date: 2017-09-07
    Description: Description of 64 species of fresh‐water Fishes of the suborder Characoidei (Cypriniformes), collected by Dr. K. H. Lüling during his 1959/60 Expedition in lower Ucayali and Iquitos regions. New forms for science (about 10 per cent of the collected species) are: a new genus, Oxybrycon, which seems to be close to Leptobrycon and Macropsobrycon; a Hemigrammus‐species and 2 Hyphessobrycon‐species; a Cheirodon (the genus was not signaled from Peruvian Amazon); and a Serrasalmus. Besides, 10 species seem to be new for the concerned territory, whereas 2 other forms have been described in former papers (see References). Some identification‐Keys are given, concerning Amazonian Triportheus and Schizodon, as well as concerning one Curimatus‐group of species. Finally a list of the characoid Fishes, known to occur in the Iquitos surroundings and in the lower Ucayali, is given.
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  • 92
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    Wiley-Blackwell
    In:  Journal of Quaternary Science, 25 (5). pp. 633-650.
    Publication Date: 2017-12-19
    Description: Two cores were recovered in the southeastern part of Lake Shkodra (Montenegro and Albania) and sampled for identification of tephra layers. The first core (SK13, 7.8 m long) was recovered from a water depth of 7 m, while the second core (SK19, 5.8 m long) was recovered close to the present-day shoreline (water depth of 2 m). Magnetic susceptibility investigations show generally low values with some peaks that in some cases are related to tephra layers. Naked-eye inspection of the cores allowed the identification of four tephra layers in core SK13 and five tephra layers in core SK19. Major element analyses on glass shards and mineral phases allowed correlation of the tephra layers between the two cores, and their attribution to six different Holocene explosive eruptions of southern Italy volcanoes. Two tephra layers have under-saturated composition of glass shards (foiditic and phonolitic) and were correlated to the AD 472 and the Avellino (ca. 3.9 cal. ka BP) eruptions of Somma-Vesuvius. One tephra layer has benmoreitic composition and was correlated to the FL eruption of Mount Etna (ca. 3.4 cal. ka BP). The other three tephra layers have trachytic composition and were correlated to Astroni (ca. 4.2 cal. ka BP), Agnano Monte Spina (ca. 4.5 cal. ka BP) and Agnano Pomici Principali (ca. 12.3 cal. ka BP) eruptions of Campi Flegrei. The ages of tephra layers are in broad agreement with eight 14C accelerator mass spectrometric measurements carried out on plant remains and charcoal from the lake sediments at different depths along the two cores. The recognition of distal tephra layers from Italian volcanoes allowed the physical link of the Holocene archive of Lake Shkodra to other archives located in the central Mediterranean area and the Balkans (i.e. Lake Ohrid). Five of the recognised tephra layers were recognised for the first time in the Balkans area, and this has relevance for volcanic hazard assessment and for ash dispersal forecasting in case of renewed explosive activity from some of the southern Italy volcanoes. Copyright © 2009 John Wiley & Sons, Ltd.
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  • 93
    Publication Date: 2018-03-07
    Description: Structure-based inhibitor design has led to the discovery of a number of potent inhibitors of glycogen phosphorylase b (GPb), N-acyl derivatives of β-d-glucopyranosylamine, that bind at the catalytic site of the enzyme. The first good inhibitor in this class of compounds, N-acetyl-β-d-glucopyranosylamine (NAG) (Ki = 32 μM), has been previously characterized by biochemical, biological and crystallographic experiments at 2.3 Å resolution. Bioisosteric replacement of the acetyl group by trifluoroacetyl group resulted in an inhibitor, N-trifluoroacetyl-β-d-glucopyranosylamine (NFAG), with a Ki = 75 μM. To elucidate the structural basis of its reduced potency, we determined the ligand structure in complex with GPb at 1.8 Å resolution. To compare the binding mode of N-trifluoroacetyl derivative with that of the lead molecule, we also determined the structure of GPb–NAG complex at a higher resolution (1.9 Å). NFAG can be accommodated in the catalytic site of T-state GPb at approximately the same position as that of NAG and stabilize the T-state conformation of the 280s loop by making several favourable contacts to Asn284 of this loop. The difference observed in the Ki values of the two analogues can be interpreted in terms of subtle conformational changes of protein residues and shifts of water molecules in the vicinity of the catalytic site, variations in van der Waals interaction, and desolvation effects.
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  • 94
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    Elsevier
    In:  Journal of Experimental Marine Biology and Ecology, 162 (2). pp. 229-241.
    Publication Date: 2018-03-16
    Description: The presented data on indirect and direct calorimetry in Halicryptus spinulosus, a species with prominent ecological significance in parts of the Baltic Sea, provide a basis for a better understanding of the metabolic adaptation of these animals to low oxygen availability in their environment. Metabolic rates in H. spinulosus were measured respirometrically as oxygen consumption and calorimetrically as heat dissipation. Oxygen uptake rates are in the range of M O2 = 3.81 ± 1.37 μmol O2·g−1 dry mass·h−1. Upon reimmersion into normoxic seawater after an anoxic incubation of 7 days, the animals exhibit an overshoot of oxygen consumption by a factor of 2.4. It takes at least 2 days for the animals to balance their oxygen consumption to previously measured rates. Direct calorimetry exhibits different strategies of H. spinulosus to cope with declining oxygen and anoxia. During the first 2 transitional days to anoxia in the calorimeter, the animals decreased heat dissipation moderately down to 53.4 and 26%, respectively, of aerobic values. The animals are not necessarily quiescent at the beginning of anoxia, but at the end of the experiments after 14 days metabolic rates have dropped substantially down to ≈2% of normoxic values. These findings are discussed with regard to an effective adaption to frequently changing oxygen regimes in deeper parts of the Baltic Sea.
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  • 95
    Publication Date: 2018-03-15
    Description: CO2 partial pressure in surface water was measured in the Northeast Atlantic and in the Hebride Shelf/North Sea area during a cruise with R.V. Poseidon in June 1991. A mean pCO2 of 303 μatm was found in the Atlantic between 50°N and 60°N. For an atmospheric CO2 content of 357.5 ppm(v) this corresponds to a partial pressure difference of −55 μatm. This supports the view that the subarctic Atlantic is a significant sink within the CO2 cycle between the ocean and the atmosphere. A comparison of our measurements with other data reveals that the pCO2 distribution changes significantly during May/June. This explained by seasonal warming, CO2 exchange with the atmosphere and biomass production. The contribution by each of these processes to the seasonal variations is calculated. It was found that during a plankton bloom the production of biomass is the dominating factor and may lower seawater pCO2 by almost 100 μatm. The shelf areas are charactrized by strong pCO2 gradients which are explained by water exchange with the Atlantic, temperature effects and biomass production.
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  • 96
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    Elsevier
    In:  Marine Pollution Bulletin, 26 (3). pp. 152-155.
    Publication Date: 2018-03-22
    Description: Skin and hair samples of harbour seals (Phoca vitulina) found dead along the west coast of northern Germany in 1988 were analysed for total mercury, cadmium and lead. Cadmium and lead concentrations were below the detection limit in most skin samples. The mercury content of the hair (median: 23.1 μg g−1 wet wt) was several magnitudes higher than the mercury content of the skin (0.27 μg g−1 wet wt). Mercury concentrations in hair samples were significantly higher than lead concentrations (0.54 μg g−1 wet wt), which significantly exceeded cadmium levels (0.09 μg g−1 wet wt). Female seals revealed lower cadmium concentrations in the hair than male seals. Accumulations of metals with age were observed for cadmium and lead in hair samples and for mercury in skin samples of male seals. A connection between metal accumulation and pigmentation or rather moult was clearly recognizable.
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  • 97
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    Elsevier
    In:  Deep Sea Research Part I: Oceanographic Research Papers, 40 (2). pp. 267-291.
    Publication Date: 2018-03-22
    Description: The spreading of Mediterranean Water (MW) released through the Straits of Gibraltar is studied with hydrographic data, oxygen, nutrients and for the first time with chlorofluoromethane (CFM, compounds F11 and F12) distributions along seven sections in the Gulf of Cadiz, and with measurements in the Western Alboran Sea and west of the Gulf. The properties of MW entering the Gulf are deduced from CFM-salinity correlations east and west of the Straits as well as from property-depth profiles in the Western Alboran Sea. At the time of the survey, the outflow originated from depths above the salinity maximum of the Intermediate Water in the Alboran Sea. It turned out that the F11/F12 ratio of the outflow is equal to the ratios found in the Atlantic water in the Gulf of Cadiz; thus the ratio carries no time information in the region. A model is developed to describe mixing of the MW undercurrent with overlying North Atlantic Central Water (NACW) from different depths. The contribution of each layer to the mixing is parameterized by a weighting factor, which has to satisfy the balances of potential temperature (θ), CFMs, oxygen and nutrients in the MW undercurrent. It is shown that entrainment of water from shallower depths into the undercurrent is important near the Iberian Continental Shelf. Farther west and south, the undercurrent mainly mixes with water from near the salinity minimum of the NACW. For regions where the undercurrent has left the bottom, additional mixing with North Atlantic Deep Water (NADW) has to be taken into account. The percentage of MW in the undercurrent decreases from 76% hear the Straits to about 34% at 7°30′W for the lower core (MI) and about 22–24% for the upper core (Mu). Assuming an outflow of undiluted MW through the Straits of 1.0 Sv, the transport of the undercurrent can be calculated by determining an average dilution factor for each section. The undercurrent transports 2.0 Sv just west of the Straits and 3.6 Sv leave the Gulf of Cadiz. At 36°N, 9°54′W, a meddy with unusually high temperatures and salinities below 500 m was found, covering the density range for both cores, Mu and Ml. From the θ−S characteristics and the evaluated mixing scheme of the meddy it appears to have formed near 7°W in the Gulf, a region up to now not proposed in the literature, and moved westward without much further mixing.
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  • 98
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    Elsevier
    In:  Advances in Parasitology, 68 . pp. 111-137.
    Publication Date: 2020-04-23
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  • 99
    Publication Date: 2020-07-28
    Description: Carbohydrates on parasite surfaces have been shown to play an important role in host–parasite coevolution, mediating host non-self recognition and parasite camouflage. Parasites that switch hosts can change their surface molecules to remain undetected by the diverse immune systems of their different hosts. However, the question of individual variation in surface sugar composition and its relation to infectivity, virulence, immune evasion and growth of a parasite in its different hosts is as yet largely unexplored. We studied such fitness consequences of variation in surface sugars in a sympatric host–parasite system consisting of the cestode Schistocephalus solidus and its intermediate hosts, a copepod and the three-spined stickleback. Using lectins to analyse the sugar composition, we show that the tapeworm changes its surface according to the invertebrate or vertebrate host. Importantly, sugar composition seems to be genetically variable, as shown by differences among tapeworm sibships. These differences are related to variation in parasite fitness in its second intermediate host, i.e. infectivity and growth. Surface sugar composition may thus be a proximate correlate of the evolutionarily relevant variability in infectivity and virulence of parasites in different hosts.
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  • 100
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    Taylor & Francis
    In:  Marine Behaviour and Physiology, 7 (1). pp. 15-24.
    Publication Date: 2018-04-18
    Description: Foraging rate was highly variable among shore crabs of the same size category and for individual crabs from day to day. Possible physiological reasons for this variability are discussed. Shore crab foraging rate, both in terms of mussels eaten per day and energy intake per day, was estimated to be higher at 17°C than at 10°C. The shape of diet curves and their mode for male shore crabs at 17°C closely resembled those for 10°C, indicating that the temperature increase had no effect on their previously demonstrated optimal foraging strategy. Female and certain male shore crabs showed a preference for prey smaller than for other equivalent sized males. These suboptimally feeding male and female crabs attained a relatively higher prédation rate (mussels day‐1), although their energy intake (KJ day‐1) remained lower than that of optimally feeding males. Preferred mussel size, number of mussels eaten per day and energy intake were strongly related to master chela height. The diet curves for female and suboptimally feeding male shore crabs could be explained by these crabs’ proportionately smaller master chelae.
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