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Effects of seasonal pack ice on the distribution of macrozooplankton and micronekton in the northwestern Weddell Sea

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Abstract

The presence of mesopelagic organisms in the guts of surface-foraging seabirds feeding in open areas within seasonal pack ice in the Antarctic has given rise to questions regarding the effects of pack ice on the underlying mesopelagic community. Bottom-moored free-vehicle acoustic instruments were used in concert with midwater trawls and baited traps to examine the abundance, size distribution and vertical distribution of pelagic organisms in the uppermost 100 m of the water column during the austral spring of 1992 in two areas of the northwestern Weddell Sea, one covered by seasonal pack icc and the other free of ice cover. Acoustic largets were more abundant and significantly larger at the open-water station than beneath pack ice. However, targets at the ice-covered site exhibited a pronounced diel pattern, with the largest targets detected only at night. Samples from night trawls at the icecovered site contained several species of large, vertically-migrating mesopelagic fishes, whereas these species were absent from trawls taken during the day. In addition, baited traps deployed in pack ice just beneath the ice-water interface collected large numbers of scavenging lysianassoid amphipods, while deeper traps beneath the ice and traps at the open-water station were empty, indicating the presence of a scavenging community associated with the undersurface of the ice. These results sapport the idea that mesopelagic organisms migrate closer to the surface beneath pack ice than in open water, exposing them to possible predation by surface-foraging seabirds.

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Authors and Affiliations

  1. Marine Biology Research Division, Scripps Institution of Oceanography, 92093-0202, La Jolla, California, USA

    R. S. Kaufmann, K. L. Smith Jr., R. J. Baldwin & R. C. Glatts

  2. Monterey Bay Aquarium Research Institute, 160 Central Avenue, 93950, Pacifie Grove, California, USA

    B. H. Robison & K. R. Reisenbichler

Authors
  1. R. S. Kaufmann
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  2. K. L. Smith Jr.
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  3. R. J. Baldwin
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  4. R. C. Glatts
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  5. B. H. Robison
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  6. K. R. Reisenbichler
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Communicated by M.F. Strathmann, Friday Harbor

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Kaufmann, R.S., Smith, K.L., Baldwin, R.J. et al. Effects of seasonal pack ice on the distribution of macrozooplankton and micronekton in the northwestern Weddell Sea. Marine Biology 124, 387–397 (1995). https://doi.org/10.1007/BF00363912

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  • DOI: https://doi.org/10.1007/BF00363912

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