WINTER GUT CONTENTS OF ANTARCTIC KRILL (EUPHAUSIA SUPERBA DANA) COLLECTED IN THE SOUTH GEORGIA AREA (15th Symposium on Polar Biology)

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概要

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• Foregut contents of Antarctic krill Euphausia superba DANA which were collected in the South Georgia area in austral winter, July 12-August 4, 1992 were observed. A total of 130 individuals (adults: 78, subadults: 49, juveniles: 3) which were caught by krill trawling from various depths were examined in this study. The foregut contents of the krill consisted of various fragments of crustacean zooplankton in 77 individuals out of 130 examined. Among the fragments a portion of the pereiopods of krill was found from all specimens examined. Although the obtained materials were geographically confined to South Georgian waters, which were free from fast ice throughout the year, the results might imply that E. superba seemed to seasonally switch their food source: E. superba demonstrated herbivorous food habits during rich phytoplankton bloom, but might change to carnivorous habits in the fall and winter. Strong cannibalistic food habits during the austral winter as found in this study are considered to be important for the population dynamics of krill.

• 国立極地研究所の論文

著者

• Kawamura Akito

  Faculty Of Bioresources Mie University

• Nishino Yasuto

  Faculty Of Bioresources Mie University

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