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  • Oxford Univ. Press
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  • 1985  (2)
  • 1
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    Densities of Antarctic Seabirds at Sea and the Presence of the Krill Euphausia superba (1985)
    Oxford Univ. Press
    In:  The Auk, 102 (3). pp. 540-549.
    Details
    Publication Date: 2020-05-13
    Description: The antarctic krill Euphausia superba forms abundant, well-organized schools in the waters off the Antarctic Peninsula. Mean avian density is 2.6 times greater in waters where krill schools are present than in waters without krill schools. Seabird density is a good predictor of the presence of krill. Seabird density did not correlate with krill density or krill school depth. Disoriented krill routinely were observed swimming near the surface above submerged schools, providing potential prey for surface-feeding birds. Responses of seabird species to the distribution of krill schools varied. The small to medium-size procellariiform species were the best indicators of krill schools; large procellariiforms and coastal species were poor indicators. Pygoscelis penguins occurred at high densities only in the presence of krill schools. These responses are consistent with the constraints imposed by the metabolic requirements and reproductive strategies of each of these groups. Krill schools were detected near the sea surface throughout the day. Correlations between seabird density and the presence of krill during daylight hours suggest that diurnal foraging is important to the seabirds of this region.
    Type: Article , PeerReviewed
    Format: text
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  • 2
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    Seasonal succession of phytoplankton in Lake Constance (1985)
    American Institute of Biological Sciences | Oxford Univ. Press
    In:  BioScience, 5 . pp. 351-357.
    Details
    Publication Date: 2020-06-16
    Description: In Lake Constance, the phytoplankton growth season starts when stratification begins in spring. Initially, maximum growth rates are favored; later, as the water column stabilizes, zooplankton grazing and competition for nutrients become the dominant selective forces. When the mixing depth increases in autumn, algae that can tolerate low light are selected for. Temperature and sedimentation turn out to be less important in succession than traditionally assumed.
    Type: Article , PeerReviewed
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