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  • 1
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    An examination of species within the genus Surirella from the Malili Lakes, Sulawesi Island, Indonesia, with descriptions of 11 new taxa. (2006)
    In:  EPIC3Diatom research, 21(1), pp. 1-56, ISSN: 0269-249X
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 2
    Electronic Resource
    Electronic Resource
    PHYSICAL PROCESSES AND EUTROPHICATION (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 18 (1982), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Biological responses to physical-chemical processes were examined in Toronto and Hamilton Harbours of Lake Ontario. Nutrient loadings to the harbors are large and are of similar magnitude, yet the trophic conditions of the harbors were considerably different. Lake oscillations were found to determine the flushing rates and environmental stability of the harbors. LOW residence times (〈10 days) resulted in homogenous chemical conditions in Toronto Harbour, and prevented the establishment of large phytoplankton crops. The longer retention time of Hamilton Harbour permitted the establishment of huger phytoplankton crops. There probably exists a critical retention time where nutrient input events persist for a sufficient period of time for the algal community to adapt to and exploit the environmental conditions of nearshore areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1982.tb00012.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Organic contaminants in snapping turtle (Chelydra serpentina) populations from southern Ontario, Canada (1993)
    Springer
    Archives of environmental contamination and toxicology 24 (1993), S. 35-43 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Organochlorine contaminant levels were measured in 78 adult snapping turtles collected from 16 sites in southern Ontario, Canada in 1988/89 to evaluate the risk to humans of consuming snapping turtles. Significant differences in turtle contaminant levels were observed among sites. Mean levels in muscle, at all sites, were below fish consumption guidelines for total polychlorobiphenyls (PCBs), total DDT and mirex. However, contaminant levels in older turtles from some sites exceeded guideline values. Multivariate statistical techniques indicated the existence of a highly significant relationship between contaminant levels in adult female turtles and their eggs. Multivariate techniques also identified differences in contaminant composition in adult snapping turtles from sites in the Great Lakes where differences in reproductive success have been previously observed. The mono-ortho substituted PCB congener 2,3,4,3′,4′-pentachlorobiphenyl (IUPAC #105) may be an important contributor to the toxic burden of snapping turtle populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01061087
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Spatial distribution of seston in an artificially mixed system (1977)
    Springer
    Hydrobiologia 54 (1977), S. 225-231 
    Details
    ISSN: 1573-5117
    Keywords: Seston mixed system ; seston ; phytoplankton production ; Wraisbury Reservoir ; artificial mixing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seston size distribution was determined with a Coulter Counter to investigate seston interaction and its effects on phytoplankton production. Spatial distribution patterns of the non-productive component of the seston were as complex as those commonly associated with algae. Seston might interact influencing production by changes in optical depth, abrasive actions and nutrient adsorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014289
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  • 5
    Electronic Resource
    Electronic Resource
    The production ecology of Stephanodiscus Astraea (Ehrenb.) Grun (1977)
    Springer
    Hydrobiologia 54 (1977), S. 247-255 
    Details
    ISSN: 1573-5117
    Keywords: Stephanodiscus ; artificial mixing ; Wraisbury Reservoir ; autotrophic versus heterotrophic production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The production ecology of Stephanodiscus astraea (Ehrenb.) Grun. is discussed with respect to other phytoplankton growths, mixing regimes and nutrient availability. Populations of Stephanodiscus were studied during 1972 and 1973 in an artificially mixed reservoir with a capacity of 3.5 × 107m3. Major nutrients such as soluble reactive phosphates (60–200 µg/1) and nitrates (1–8 mg/1) were not limiting. Large amounts of silicate (approximately 10 mg/1) were utilized to support moderately large populations of S. astraea (1.3 × 107 µm3/ml). Light penetration and mixing regimes strongly affected the periodicity and size of standing crops. It is suggested that heterotrophic production can interact with the mixing environment to influence the production of turbid waters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014292
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  • 6
    Electronic Resource
    Electronic Resource
    Organic contaminant exposure in the Lake St. Clair food web (1990)
    Springer
    Hydrobiologia 281 (1990), S. 19-27 
    Details
    ISSN: 1573-5117
    Keywords: food web ; contaminant exposure ; chemical equilibrium ; concentration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chemical concentrations and distributions in an aquatic food web were studied to quantify the relative importance of chemical properties versus food web processes in determining exposure dynamics of organic contaminants in aquatic ecosystems. Five organochlorines were measured (Pentachlorobenzene QCB, Hexachlorobenzene HCB, Octachlorostyrene OCS, Dichlorodiphenyldichloroethylene DDE and Polychlorinated Biphenyls PCBs) in the food web of Lake St. Clair. Levels of QCB in aquatic organisms ranged from 1.0 to 25 µg kg−1 lipid, and levels of HCB ranged from 10 to 410 µg kg−1 lipid. More elevated concentrations of OCS (13 to 392 µg kg−1 lipid), DDE (162 to 11 986 µg kg−1 lipid) and PCB (650 to 64 900 µg kg−1 lipid) were observed. Organism — water equilibrium ratios were calculated for all species sampled to quantify the importance of food web processes in regulating contaminant exposure dynamics. Correlations of organism — water equilibrium ratios with body size were not significant for QCB, HCB and OCS (P〉0.1), but were found to be significant for DDE and PCB (P〈0.01). Results support the conclusion that both chemical properties and food web dynamics regulate the distribution and concentration of organochlorines in aquatic ecosystems. Food web processes are important, however, for chemicals, that are not metabolized and have octanol — water partition coefficients (log K ow) greater than 5.5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006552
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  • 7
    Electronic Resource
    Electronic Resource
    Phytoplankton community structure and distribution in the nearshore zone of Lake Ontario (1984)
    Springer
    Hydrobiologia 114 (1984), S. 51-66 
    Details
    ISSN: 1573-5117
    Keywords: phytoplankton ; nearshore ; Lake Ontario ; environmental stability ; community structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Spatial and temporal distributions of phytoplankton were studied during 1979 in the nearshore zone of Lake Ontario. Genera such as Dinobryon, Oscillatoria, and Gymnodinium tended to be found at discrete depths whereas other genera such as Cryptomonas and Rhodomonas tended to be more uniformly distributed throughout the water column. The discrete depth distribution of some of these genera compared with the weak thermal stabilization of the area suggests depth selection and habitat preference within the algal community. Physical processes probably played a major role in regulating the timing and duration of vertical diatom pulses, and resuspension from the sediment played a major role as to the timing of the autumn growth. Vertical mixing in the nearshore zone was sufficient for some diatom genera such as Tabellaria to maintain populations throughout the summer. These mixing processes, however, affect the stability of community structures and associations that develop within the water column. The role of physical processes and their potential effects on algal production in the Great Lakes is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00016601
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  • 8
    Electronic Resource
    Electronic Resource
    Community structure in epilinmetic and metalimnetic phytoplankton assemblages (1989)
    Springer
    Hydrobiologia 182 (1989), S. 59-71 
    Details
    ISSN: 1573-5117
    Keywords: structure ; equilibrium ; community correlation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Epilimnetic and metalimnetic phytoplankton communities were compared to assess the relative importance of autogenic and allogenic factors regulating community composition and structure. In the epilimnion, opportunistic species were predominant, and as a result there was considerabletemporal change in the community as measured by the community coefficient. In the metalimnion, however, temporal changes in the community coefficient were small compared with changes along the vertical gradient. It appears that non-equilibrium dynamics caused by short term changes in physical processes might be regulating the phytoplankton community in the epilimnion, and vertical niche partitioning along the vertical gradient was minor compared with temporal changes of community structure. The metalimnion supported communities with a more persistent structure over time, although vertical resource partitioning between density layers resulted in considerable change of community structure with depths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006368
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  • 9
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    Photoferrotrophs thrive in an Archean Ocean analogue (2008)
    National Academy of Sciences
    Details
    Publication Date: 2008-10-06
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 10
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    Organic contaminants in snapping turtle (Chelydra serpentina) populations from southern Ontario, Canada (1993)
    Springer
    Details
    Publication Date: 1993-01-01
    Print ISSN: 0090-4341
    Electronic ISSN: 1432-0703
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Published by Springer
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