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High density of ice krill (Euphausia crystallorophias) in the Amundsen sea coastal polynya, Antarctica

La, Hyoung Sul; Lee, Hyungbeen; Fielding, Sophie; Kang, Donhyug; Ha, Ho Kyung; Atkinson, Angus; Park, Jisoo; Siegel, Volker; Lee, Sang Hoon; Shin, Hyoung Chul. 2015 High density of ice krill (Euphausia crystallorophias) in the Amundsen sea coastal polynya, Antarctica. Deep Sea Research Part I: Oceanographic Research Papers, 95. 75-84. 10.1016/j.dsr.2014.09.002

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Text (This article has been accepted for publication and will appear in a revised form in Deep Sea Research I, published by Elsevier. Copyright Elsevier.)
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Abstract/Summary

High densities of ice krill Euphausia crystallorophias were observed along six acoustic transects within the Amundsen Sea Coastal Polynya, Antarctica. Two-frequency acoustic backscatter data was examined in the austral summers of January 2011 and February 2012. A dB identification window (Sv120−38) identified ice krill dominating the acoustic backscatter. The density of ice krill, calculated with the stochastic distorted-wave born approximation model, ranged between 4.5 and 30 g wet mass m−2 for each transect (a mean of 16 g wet mass m−2 for all transects), these high values are an order of magnitude higher than recorded previously in the Ross Sea Polynya. High densities were detected along the ice shelf and near the boundary between pack ice and coastal polynya, and we postulate that these could be important habitats for ice krill. The high densities observed along the transects make ice krill a potentially important, but poorly known contributor to these high-latitude shelf food webs.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.dsr.2014.09.002
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Ecosystems
ISSN: 09670637
Additional Keywords: ice krill (Euphausia crystallorophias, krill identification, acoustic data, coastal polynya, Amundsen Sea
Date made live: 17 Sep 2014 10:19 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/508427

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