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Polar Biology

, Volume 36, Issue 10, pp 1451–1462 | Cite as

Interannual variability in the feeding of ice fish (Notothenioidei, Channichthyidae) in the southern Scotia Arc and the Antarctic Peninsula region (CCAMLR Subareas 48.1 and 48.2)

  • Karl-Hermann Kock
  • Joachim Gröger
  • Christopher D. Jones
Original Paper

Abstract

We have studied the annual variation in food intake of three sub-Antarctic ice fish species (Champsocephalus gunnari, Chaenocephalus aceratus, and Pseudochaenichthys georgianus) and three high-Antarctic ice fish species (Chionodraco rastrospinosus, Cryodraco antarcticus, and Chaenodraco wilsoni). Stomach content analyses were conducted during bottom trawl surveys around the South Shetland Islands in 1998, 2001, 2002, 2003, and 2007, the South Orkney Islands in 1999 and 2009, and off the north-western Antarctic Peninsula in 2002, 2006, and 2006/2007 in order to obtain further insight into the amount of food of Antarctic demersal fish consume during summer. Annual variation in food intake was comparatively low within an area in the krill-feeding species C. gunnari and C. wilsoni. Food intake was much more variable, by a factor of 2 or 3 among years and areas, in larger C. aceratus and C. antarcticus, which rely heavily on fish as their dietary source. Food consumption was intermediate in the two species P. georgianus and C. rastrospinosus, which rely on both krill and fish.

Keywords

Southern Ocean Ice fish Food intake Daily food consumption 

Notes

Acknowledgments

The authors are very grateful to a large number of scientists onboard R/V ‘Yuzhmorgeologiya’ and R/V ‘Polarstern’ for their never-ending support during the cruises. We gratefully acknowledge the help of the masters and crews of the two vessels when collecting the field data.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Karl-Hermann Kock
    • 1
  • Joachim Gröger
    • 1
    • 2
  • Christopher D. Jones
    • 3
  1. 1.Institut für SeefischereiJohann Heinrich von Thünen Institut für Ländliche Räume, Wald und FischereiHamburgGermany
  2. 2.Institut für BiowissenschaftenUniversität RostockRostockGermany
  3. 3.Antarctic Ecosystem Research Division, Southwest Fisheries Science CenterNOAA National Marine Fisheries ServiceLa JollaUSA

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