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  • Other Sources  (18)
  • Articles (OceanRep)  (18)
  • Springer  (18)
  • American Meteorological Society
  • Blackwell Publishing Ltd
  • International Union of Crystallography
  • Springer Nature
  • 1985-1989  (18)
  • 1975-1979
  • 1989  (18)
  • 1
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    The diets of five summer breeding seabirds in Adélie Land, Antarctica (1989)
    Springer
    In:  Polar Biology, 9 (3). pp. 137-145.
    Details
    Publication Date: 2020-06-10
    Description: The diets of five breeding seabird species were investigated on Adélie Land in January–February 1982. Stomach contents of Adélie penguins, Pygoscelis adeliae, were sampled by a water off-loading method and of Procellariiformes by spontaneous regurgitation. Diet compositions by mass were: Adélie penguin (79% euphausiid, 18% fish, 3% squid); Cape pigeon, Daption capense, (64% euphausiid, 29% fish, 7% carrion); Antarctic fulmar, Fulmarus glacialoides, (64% euphausiid, 20% carrion, 16% fish); snow petrel, Pagodroma nivea, (95% fish, 2% euphausiid, 1% carrion) and Wilson's stormpetrel, Oceanites oceanicus, (39% fish, 37% euphausiid, 13% carrion, 12% various crustaceans). The present Adélie penguin diet is consistent with those reported in other studies, given our knowledge of geographical variation in food availability. Differences in the diets of fulmarine petrels appear to relate to differences in foraging areas. The snow petrel is a fish-eating bird associated with pack-ice. Cape pigeon and Antarctic fulmar are mainly krill-eaters and we infer segregation along a neritic/oceanic gradient because of the importance of the neritic Euphausia crystallorophias in the former and the oceanic E. superba in the latter.
    Type: Article , PeerReviewed
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  • 2
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    Seabird and fur seal responses to vertically migrating winter krill swarms in Antarctica (1989)
    Springer
    In:  Polar Biology, 10 (1).
    Details
    Publication Date: 2020-06-10
    Description: The foraging behaviour of fur seals and two species of surface feeding seabirds was observed over swarms of vertically migrating krill along the Antarctic Peninsula in July 1987. Fur Seal haul out patterns were correlated with krill in the upper 30 m of the water column. Krill moved to the surface at night; seals subsequently foraged from 1400-0700 hours before returning to floes. Foraging was continuous through the night. Dive duration decreased as krill moved up to the surface; shorter dives may have been more successful than longer ones. It is possible that very deep dives, which occur early in a foraging bout, represent more of an attempt to assess krill depth and distribution rather than being a genuine foraging effort. Seabirds responded to the presence of a surface krill swarm by circling over it and foraging; krill at depths greater than 30 m elicited directional flight and low frequencies of prey capture attempts. Both Snow Petrels and Antarctic Terns preyed on krill, but each species approached the swarms from different habitats. Snow Petrels primarily overflew areas covered by ice; terns preferred open water. This suggested that prey encounters are essentially opportunistic, although the search for prey is limited to rather specific marine habitats. This feature may be important to our understanding of the factors that determine the pelagic distribution of seabirds.
    Type: Article , PeerReviewed
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  • 3
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    Mass transfer during sub-seafloor alteration of the upper Troodos crust (Cyprus) (1989)
    Springer
    In:  Contributions to Mineralogy and Petrology, 102 (1). pp. 93-101.
    Details
    Publication Date: 2018-03-02
    Description: Five major alteration zones in the Extrusive Series and the Sheeted Dike Complex of the Troodos Ophiolite are each characterized by (a) distinct elemental changes compared to the original composition and (b) secondary mineralogy. The upper ca. 300 m of the extrusive crust, the highly oxidatedcold seawater alteration zone (CSA), is strongly enriched in K2O and depleted in Na2O. It is followed downwards by alow temperature alteration zone (〈170° C) which is most widespread in the Troodos extrusives and where Na2O and K2O are enriched, the latter less strongly than in the CSA zone. Three types ofhigh temperature alteration zones (〈440° C; HTA I–III) are found in the Sheeted Dike Complex. All are marked by thorough leaching of K2O, while the behavior of Na2O (e.g. unchanged in type III) and CaO (depleted in type I, enriched in types II, III) is variable. Mass budgets of elemental changes are quantified by calibration of whole rock analyses via systematic stable element variations of fresh glasses found throughout the extrusive section. The Troodos extrusive crust and upper Sheeted Dike Complex are a major sink for MgO, K2O, and Na2O, and a source for CaO; the overall scale of fluxes drastically exceeds estimates based on fresh basalt compositions from present ocean crust.
    Type: Article , PeerReviewed
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  • 4
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    Seasonal growth lines in pleistocene scleractinians from barbados: Record potential and diagenesis (1989)
    Springer
    In:  Paläontologische Zeitschrift, 63 (3). pp. 207-214.
    Details
    Publication Date: 2016-02-23
    Description: Growth line analysis of diagenetically altered scleractinians is only possible if carbonate diagenesis has followed the pathway of aragonite leaching and coeval formation of low magnesium calcite. All other possibilities of aragonite transformation into calcite exclude the preservation of this growth line banding. Examples of these diagenetic patterns are found in the Pleistocene of Barbados.
    Type: Article , PeerReviewed
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  • 5
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    Authigenic zeolites and their relation to silica diagenesis in ODP Site 661 sediments (Leg 108, Eastern Equatorial Atlantic) (1989)
    Springer
    In:  Geologische Rundschau, 78 (3). pp. 779-792.
    Details
    Publication Date: 2020-07-30
    Description: At ODP Site 661 from the continental margin of Northwest Africa, authigenic clinoptilolites were investigated in detail. Based on chemical data, crystal size and shape and their intergrowth with associated mineral phases, two types of clinoptilolite (type A and B) occur representing different diagenetic conditions under which the formation of zeolites took place. Clinoptilolite type A was found in a sediment section comprises numerous hiatuses and stratigraphically condensed sediments and could have been formed during early diagenesis. In contrast, clinoptilolite type B was precipitated in Campanian sediments during later diagenesis, after the transformation from opal-A to opal-CT had taken place. At Site 661, the silica source for the authigenesis of both clinoptilolite types is biogenic opal. Volcanic ash material occurs, but in low amounts and thus is not a prerequisite for the formation of clinoptilolite at Site 661.
    Type: Article , PeerReviewed
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  • 6
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    Geology of an active hot spot: Teahitia-Mehetia region in the South Central Pacific (1989)
    Springer
    In:  Marine Geophysical Research, 11 (1). pp. 27-50.
    Details
    Publication Date: 2017-06-22
    Description: The Teahitia-Mehetia hot spot region located in the southeastern extension of the Society Islands chain, near 18° S–148° W consists of several active volcanoes. The distribution of recent volcanic activity correlates with seismic epicenters, and covers an area of more than 1000 km2. Intermittent volcanic activity has given rise to large (〉1000 m high) and small (〈500 m high) edifices composed of various types of flows. Several recent volcanic events have produced a suite of alkalic rocks ranging from ankaramites, through alkali basalts to trachy-phonolites. The presence of altered MORB-like tholeiites on one small seamount suggests that a different mantle source material was involved in forming some of the crust in this hot spot region.
    Type: Article , PeerReviewed
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  • 7
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    Antarctic cephalopods - a living marine resource (1989)
    Springer
    In:  AMBIO, 18 (1). pp. 55-59.
    Details
    Publication Date: 2020-09-18
    Description: In the Antarctic there are large unexploited stocks of cephalopods with high potential commercial value and there are two important fisheries for squid in the cool temperate waters of the Southern Ocean, adjacent to the Antarctic, in the Atlantic and Pacific sectors. Squid fisheries can develop very rapidly, and if this were to happen in the Antarctic before adequate management plans could be established, there would be serious consequences for the squid stocks, and also for the vertebrate predator populations which depend on them. It is especially important to increase our knowledge of the Antarctic cephalopod species, their distribution and role in the food chain, and to understand their life cycles
    Type: Article , PeerReviewed
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  • 8
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    Phytoplankton carbon dynamics during a winter/spring diatom bloom in an enclosed marine ecosystem: primary production, biomass and loss rates (1989)
    Springer
    In:  Marine Biology, 103 . pp. 131-142.
    Details
    Publication Date: 2018-03-21
    Description: Phytoplankton production, standing crop, and loss processes (respiration, sedimentation, grazing by zooplankton, and excretion) were measured on a daily basis during the growth, dormancy and decline of a winter-spring diatom bloom in a large-scale (13 m3) marine mesocosm in 1987. Carbonspecific rates of production and biomass change were highly correlated whereas production and loss rates were unrelated over the experimental period when the significant changes in algal biomass characteristic of phytoplankton blooms were occurring. The observed decline in diatom growth rates was caused by nutrient limitation. Daily phytoplankton production rates calculated from the phytoplankton continuity equation were in excellent agreement with rates independently determined using standard 14C techniques. A carbon budget for the winter bloom indicated that 82.4% of the net daytime primary production was accounted for by measured loss processes, 1.3% was present as standing crop at the end of the experiment, and 16.3% was unexplained. Losses via sedimentation (44.8%) and nighttime phytoplankton respiration (24.1%) predominated, while losses due to zooplankton grazing (10.7%) and nighttime phytoplankton excretion (2.8%) were of lesser importance. A model simulating daily phytoplankton biomass was developed to demonstrate the relative importance of the individual loss processes.
    Type: Article , PeerReviewed
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  • 9
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    The role of competition for limiting resources in phytoplankton species replacements (1989)
    Springer
    In:  In: Plankton ecology: succession in plankton communities. , ed. by Sommer, U. Springer, Berlin, Germany, pp. 57-106. ISBN 3-540-51373-6
    Details
    Publication Date: 2012-03-22
    Type: Book chapter , NonPeerReviewed
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  • 10
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    Plankton ecology, succession in plankton communities (1989)
    Springer
    In:  , ed. by Sommer, U. Springer, Berlin, Germany, 369 pp. ISBN 3-540-51373-6
    Details
    Publication Date: 2012-02-28
    Type: Book , NonPeerReviewed
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