Effects of Pack Ice on the Composition of Micronektonic Communities in the Weddell Sea

  • D. G. Ainley
  • W. R. Fraser
  • K. L. Daly


Using seabirds as sampling devices on two cruises in the northwestern Weddell Sea, we investigated the species and lengthfrequency distribution of micronekton in surface waters. Our micronekton samples are among the first ever collected simultaneously in both ice-covered and adjacent ice-free waters in the Antarctic using the same technique. Changes in the abundance or presence of certain crustacean, squid, and fish species were related to the presence of ice, and to distance from the ice edge. Length-frequency distributions representing age- or sex-classes of fish and krill were also affected by proximity to the ice edge. Our data indicate that the proximity of sampling to pack ice may affect our perception of the composition of micronektonic communities, and that the marginal ice zone is an important area for juvenile age-classes of pelagic fish and krill.


Emperor Penguin Myctophid Fish Antarctic Prion Seabird Diet Juvenile Krill 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • D. G. Ainley
    • 1
  • W. R. Fraser
    • 1
  • K. L. Daly
    • 2
  1. 1.Point Reyes Bird ObservatoryStinson BeachUSA
  2. 2.School of OceanographyUniversity of WashingtonSeattleUSA

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