Aspects of the Roles of Squid in Food Chains of Marine Antarctic Ecosystems

  • T. Nemoto
  • M. Okiyama
  • M. Takahashi

Summary

Squid (Cephalopoda) are important organisms in marine food chains. However, there are very few studies of their ecological roles in marine ecosystems of the Antarctic. Seventy-six specimens of squid, both large (ca 355 mm in mantle length) and small (ca 40 mm), have been collected by large mid-water trawl operations of the Japanese pilot fishery for Antarctic Krill, Euphausia superba, in the Antarctic during 1980–81 and 1981–82. The squid collected are all considered to be young juveniles distributed at shallower depths than adults. Two species, Kondakovia longimana and Moroteuthis knipovitchi, are dominant. Alluroteuthis antarcticus, Pholidoteuthis boschmai, Brachioteu this picta and Galiteuthis glacialis also occurred in the collections. These squid consume various kinds of food, but they feed mainly on macro-zooplankton and micro-nekton. Krill is the main food item of squid in the Antarctic. An amphipod, Themisto gaudichaudii, is also a major component of the food of Kondakovia longimana. Small euphausiids, Thysanoessa macrura, and large chaetognaths, Sagitta gazellae, are also found in the stomachs of K. longimana, which indicates that the species is a plankton feeder. Fish are considered to be a major food item for Moroteuthis knipovitchi, together with E. superba. Cannibalism appears to be rather common in these squid. Predation by deep-diving Sperm Whales, Physeter catodon, on squid larger than 400 mm in mantle length was observed, and this, associated with the fact that such large squid were not caught in mid-water trawls, suggests that squid are segregated into different water depths according to size and maturity in the Antarctic.

Keywords

Biomass Formalin Sponge Meso 

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References

  1. Clarke MR (1977) Beaks, nets and numbers. Symp Zool Soc Lond 38: 89–126Google Scholar
  2. Clarke MR (1980a) Squids and whales. NERC News J 2 (9): 4–6Google Scholar
  3. Clarke MR (1980a) Cephalopoda in the diet of sperm whales of the outhern hemisphere and their bearing on sperm whale biology. Discovery Rep 27: 1–324Google Scholar
  4. Clarke MR, Lu CC (1975) Vertical distribution of cephalopods at 18°N 25°W in the North Atlantic. J Mar Biol Assoc UK 55: 165–182CrossRefGoogle Scholar
  5. Filippova JA (1972) New data on the squids (Cephalopoda: Oegopsida) from the Scotia Sea (Antarctica). Malacologia 11 (2): 391–406Google Scholar
  6. Laws RM (1977) Seals and whales of the Southern Ocean. Phil Trans R Soc Lond B 279: 81–96CrossRefGoogle Scholar
  7. Man JWS (1962) The natural history and geography of the Antarctic krill (Euphausia superba). Discovery Rep 32: 33–464Google Scholar
  8. McSweeny ES (1978) Systematics and morphology of the Antarctic cranchiid squid Galiteuthis glacialis (Chun). Antarc Res Ser 27: 1–39CrossRefGoogle Scholar
  9. Okiyama M (1965) On the feeding habits of the common squid, Todarodes pacificus Steenstrup in the off-shore region of the Japan Sea. Bull Jpn Sea Reg Fish Res Lab 14: 31–41Google Scholar
  10. Okutani T (1962) Diet of the common squid, Ommatrephes sloani pacificus landed around Ito Port, Shizuoka Prefecture. Bull Tokai Reg Fish Res Lab 32: 4–47Google Scholar
  11. Roper CFE (1977) Comparative capture of pelagic cephalopods by midwater trawls. Symp Zool Soc Lond (1977) 38: 61–87Google Scholar
  12. Tarasevich MN (1968) Dependence of distribution of the sperm whale males upon the character of feeding. Zool Z Ukrayiny 47 (11): 1683–1688Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1985

Authors and Affiliations

  • T. Nemoto
    • 1
  • M. Okiyama
    • 1
  • M. Takahashi
    • 2
  1. 1.Ocean Research InstituteUniversity of TokyoNakano, Tokyo 164Japan
  2. 2.Japan Marine Fisheries Resources Research CentreChiyoda, Tokyo 102Japan

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