Feeding by Euphausia superba and Copepod Species in Response to Varying Concentrations of Phytoplankton

  • S. B. Schnack

Summary

The feeding behaviour of dominant copepod species (Calanus propinquus, Calanoides acutus, Rhincalanus gigas, Metridia gerlachei and M. curticauda) and of the Antarctic Krill, Euphausia superba, was studied during 2 cruises in the Atlantic sector of the Southern Ocean. The phytoplankton composition differed markedly between the 2 cruises. In November-December 1980, Thalassiosira spp. dominated close to the ice-edge, whereas Corethron criophilum was predominant in the Drake Passage. In February 1982, the diatoms, C. criophilum, Chaetoceros spp. and Biddulphia spp., as well as μ-flagellates were most abundant. However, all copepod species, as well as Krill, fed efficiently on the most abundant food item and, on both cruises, these animals fed on the same food organisms. However, feeding rates differed between the species; Metridia gerlachei showing higher feeding rates (in terms of food ingested on a weight-specific basis) than the other animals studied.

Keywords

Biomass Formalin Filtration Phytoplankton Polyethylene 

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References

  1. Antezana T; Ray K; Melo C (1982) Trophic behavior of Euphausia superbaDana in laboratory conditions. Polar Biol 1: 77–82Google Scholar
  2. Boyd CM; Heyraud M; Boyd CN (to be published) Feeding behavior of Antarctic krill, Euphausia superba. J Crust BiolGoogle Scholar
  3. Conover RJ (1966) Assimilation of organic matter by zooplankton. Limnol Oceanogr 11: 338–345CrossRefGoogle Scholar
  4. Cowles TJ (1979) The feeding response of copepods from the Peru upwelling system: Food size selection. J Mar Res 37: 601–622Google Scholar
  5. Frost BW (1972) Effects of size and concentration of food particles on the feeding behavior of the marine planktonic copepod Cala-nus pacificus. Limnol Oceanogr 17: 805–815CrossRefGoogle Scholar
  6. Fryer G (1957) The food of some fresh-water cyclopoid copepods and its ecological significance. J Animal Ecol 26: 263–286CrossRefGoogle Scholar
  7. Gamble JC (1978) Copepod grazing during a declining spring phytoplankton bloom in the northern North Sea. Mar Bio 149: 303–315CrossRefGoogle Scholar
  8. Harris RP (1982) Comparison of the feeding behaviour of Calanusand Pseudocalanusin two experimentally manipulated enclosed ecosystems. J Mar Biol Assoc UK 62: 71–91CrossRefGoogle Scholar
  9. Jacobs J (1974) Quantitative measurements of food selection. Oecologia (Berlin) 14: 413–417CrossRefGoogle Scholar
  10. Kato M; Murano M; Segawa S (1979) Estimation of the filtering rate of the Antarctic krill under laboratory conditions. Trans Tokyo Univ Fish 3: 107–112Google Scholar
  11. Kato M; Segawa S; Tanoue E; Murano M (1982) Filtering and ingestion rates of the Antarctic krill Euphausia superbaDana. Trans Tokyo Univ Fish 5: 167–175Google Scholar
  12. Lenz J (1974) Untersuchungen zum Nahrungsgefüge im Pelagial der Kieler Bucht, der Gehalt an Phytoplankton, Zooplankton and organischem Detritus in Abhängigkeit von Wasserschichtung, Tiefe and Jahreszeit. Habilitationsschrift, Universität KielGoogle Scholar
  13. Mackintosh NA (1934) Distribution of the macroplankton in the Atlantic Sector of the Antarctic. Discovery Rep 9: 65–160Google Scholar
  14. Maly EJ; Maly MP (1974) Dietary differences between two cooccurring calanoid copepod species. Oecologia (Berlin) 17: 325–333CrossRefGoogle Scholar
  15. Meyer MA; El-Sayed SZ (1983) Grazing of Euphausia superbaDana on natural phytoplankton populations. Polar Biol 1: 193–197CrossRefGoogle Scholar
  16. Morris DJ (to be published) Filtration rates of Euphausia superba Dana: Under or over estimates? J Crust BiolGoogle Scholar
  17. Moms DJ; Ward P; Clarke A (1983) Some aspects of feeding in the Antartic krill, Euphausia superba. Polar Biol 2: 21–26CrossRefGoogle Scholar
  18. Poulet SA (1978) Comparison between five coexisting species of marine copepods feeding on naturally occurring particulate matter. Limnol Oceanogr 23: 1126–1143CrossRefGoogle Scholar
  19. Poulet SA; Chanut JP (1975) Nonselective feeding of Pseudocalanus. J Fsh Res Board Can 32: 706–713CrossRefGoogle Scholar
  20. Richman S; Heinle DR; Huff R (1977) Grazing by adult estuarine calanoid copepods of the Chesapeake Bay. Mar Biol 42: 69–84CrossRefGoogle Scholar
  21. Schnack SB (1983) Feeding of two Antarctic copepod species (Cala-nus propinquusand Metridia gerlachei)on a mixture of centric diatoms. Polar Biol 2: 63–68CrossRefGoogle Scholar
  22. Schnack SB; Smetacek V; v. Bodungen B; Stegmann P (to be published) Utilization of phytoplankton by copepods in Antarctic waters during spring. In: Gray S, Christiansen ME (eds) 18th EMBS Marine Biology of Polar Regions and Effects of Stresseson Marine Organisms. Wiley, Chichester.Google Scholar
  23. Strathmann RR (1967) Estimating the organic carbon content of plankton from cell volume and plasma volume. Limnol Oceanogr 12: 411–418CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1985

Authors and Affiliations

  • S. B. Schnack
    • 1
  1. 1.Alfred-Wegener-Institut für PolarforschungColumbus-CenterBremerhavenGermany

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