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The functional biology and trophic role of krill (Thysanoessa raschii) in a Greenlandic fjord |
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| Authors: | Mette Dalgaard Agersted Torkel Gissel Nielsen Peter Munk Bent Vismann Kristine Engel Arendt |
| Institution: | 1. DTU Aqua, National Institute of Aquatic Resources, Section for Ocean Ecology and Climate, J?gersborg All?? 1, 2920, Charlottenlund, Denmark 2. Marine Biological Laboratory, Institute of Biology, University of Copenhagen, Strandpromenaden 5, 3000, Helsing?r, Denmark 3. Greenland Climate Research Centre, c/o Greenland Institute of Natural Resources, PO Box 570, Kivioq 2, 3900, Nuuk, Greenland |
| 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 Godth?bsfjord (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???m, 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. |
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