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Marine Biology

, Volume 158, Issue 6, pp 1387–1402 | Cite as

The functional biology and trophic role of krill (Thysanoessa raschii) in a Greenlandic fjord

  • Mette Dalgaard Agersted
  • Torkel Gissel Nielsen
  • Peter Munk
  • Bent Vismann
  • Kristine Engel Arendt
Original Paper

Abstract

Despite being a key zooplankton group, knowledge on krill biology from the Arctic is inadequate. The present study examine the functional biology and evaluate the trophic role of krill in the Godthåbsfjord (64°N, 51°W) SW Greenland, through a combination of fieldwork and laboratory experiments. Krill biomass was highest in the middle fjord and inner fjord, whereas no krill was found offshore. The dominating species Thysanoessa raschii revealed a type III functional response when fed with the diatom Thalassiosira weissflogii. At food saturation, T. raschii exhibited a daily ration of 1% body C d−1. Furthermore, T. raschii was capable of exploiting plankton cells from 5 to 400 μm, covering several trophic levels of the pelagic food web. The calculated grazing impact by T. raschii on the fjord plankton community was negligible. However, the schooling and migratory behaviour of krill will concentrate and elevate the grazing in specific areas of the euphotic zone.

Keywords

Phytoplankton Functional Response Clearance Rate Oxygen Consumption Rate Prey Size 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This study (ECOGREEN) was funded by a grant from the Commission for Scientific Research in Greenland (KVUG), the Danish Natural Sciences Research Council, and is a contribution of the Greenland Climate Research Centre. Greenland Institute of Natural Resources is thanked for excellent laboratory facilities and logistical support. Also, we would like to thank Anja Retzel (GINR) for collecting krill biomass data, Prof. Thomas Kiørboe and Dr. Steffen Oppel for statistical advice, and Dr. Kam W. Tang for providing various data on mesozooplankton biomass.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Mette Dalgaard Agersted
    • 1
    • 2
  • Torkel Gissel Nielsen
    • 1
  • Peter Munk
    • 1
  • Bent Vismann
    • 2
  • Kristine Engel Arendt
    • 3
  1. 1.DTU Aqua, National Institute of Aquatic ResourcesSection for Ocean Ecology and ClimateCharlottenlundDenmark
  2. 2.Marine Biological LaboratoryInstitute of Biology, University of CopenhagenHelsingørDenmark
  3. 3.Greenland Climate Research Centre, c/o Greenland Institute of Natural ResourcesNuukGreenland

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