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  • Other Sources  (3)
  • American Chemical Society
  • American Meteorological Society
  • Nature Publishing Group
  • PANGAEA
  • Taylor & Francis
  • 1985-1989  (3)
  • 1965-1969
  • 1985  (3)
  • 1
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    Unknown
    Aspects of natural foraging bySepietta oweniana(Mollusca, Cephalopoda) (1985)
    Taylor & Francis
    In:  Ophelia, 24 (1). pp. 65-74.
    Details
    Publication Date: 2020-06-15
    Description: The feeding biology of the nectobenthic, sepiolid squid, Sepietta oweniana is treated based on behavioural observations in aquaria and stomach content analyses on 859 trawl caught squid. Juvenile squid in aquaria catch free-swimming prey, preferably the mysid Praunus flexuosus, day and night using the bottom only for shorter resting periods. Adult squid forage from dusk till dawn from positions close to the bottom and spend the day buried in the bottom. Praunus flexuosus is preferred as prey in comparison with demersal and benthic crustaceans as Palaemon elegans and Crangon crangon. Stomach analyses show that in daytime catches, only 16% of all analyzed specimens had stomach contents. Low frequencies were consistent throughout most sampled months in 1979 and 1982. Of the specimens with stomach contents most (50–100%) contained fragments of the euphausiid Meganyctiphanes norvegica. Specimens with remains of decapod shrimps were found in late spring and early summer. It is concluded that S. oweniana feeds in the hyperbenthic habitat at very low light intensities mostly on Meganyctiphanes norvegica in northern waters. A tentative ecological trade off explanation for this apparently inefficient feeding pattern is briefly discussed.
    Type: Article , PeerReviewed
    Format: text
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  • 2
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    Anomalous 13C enrichment in modern marine organic carbon (1985)
    Nature Publishing Group
    In:  Nature, 315 (6016). pp. 216-218.
    Details
    Publication Date: 2016-10-26
    Description: Marine organic carbon is heavier isotopically (13C enriched) than most land-plant or terrestrial organic C1. Accordingly, δ 13C values of organic C in modern marine sediments are routinely interpreted in terms of the relative proportions of marine and terrestrial sources of the preserved organic matter2,3. When independent geochemical techniques are used to evaluate the source of organic matter in Cretaceous or older rocks, those rocks containing mostly marine organic C are found typically to have lighter (more-negative) δ 13C values than rocks containing mostly terrestrial organic C. Here we conclude that marine photosynthesis in mid-Cretaceous and earlier oceans generally resulted in a greater fractionation of C isotopes and produced organic C having lighter δ 13C values. Modern marine photosynthesis may be occurring under unusual geological conditions (higher oceanic primary production rates, lower P CO2) that limit dissolved CO2 availability and minimize carbon isotope fractionation4.
    Type: Article , PeerReviewed
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  • 3
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    Does the ocean–atmosphere system have more than one stable mode of operation? (1985)
    Nature Publishing Group
    In:  Nature, 315 (6014). pp. 21-26.
    Details
    Publication Date: 2016-06-10
    Description: The climate record obtained from two long Greenland ice cores reveals several brief climate oscillations during glacial time. The most recent of these oscillations, also found in continental pollen records, has greatest impact in the area under the meteorological influence of the northern Atlantic, but none in the United States. This suggests that these oscillations are caused by fluctuations in the formation rate of deep water in the northern Atlantic. As the present production of deep water in this area is driven by an excess of evaporation over precipitation and continental runoff, atmospheric water transport may be an important element in climate change. Changes in the production rate of deep water in this sector of the ocean may push the climate system from one quasi-stable mode of operation to another.
    Type: Article , PeerReviewed
    Format: text
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