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Grazing impact of O...
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Tönnesson, Kajsa,1971Gothenburg University,Göteborgs universitet,Institutionen för marin ekologi,Department of Marine Ecology
(author)
Grazing impact of Oikopleura dioica and copepods on an autumn plankton community
- Article/chapterEnglish2005
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LIBRIS-ID:oai:gup.ub.gu.se/59877
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https://gup.ub.gu.se/publication/59877URI
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https://doi.org/10.1080/17451000500396435DOI
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Subject category:art swepub-publicationtype
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Copepods and appendicularians are major grazers in the pelagic environment. They have different retention efficiencies for prey and may therefore exert a variable grazing pressure on the spectrum of pico- to micro-plankton. We determined clearance rates of both groups at one station during 24 h in the Gullmar fjord, west Sweden, in autumn 1999. Total potential prey biomass ranged from 75 mu g C l(-1) at the surface to 14 mu g C l(-1) at 30 m with a dominance of larger dinoflagellates (10-25 mu m athecate species and Gymnodinium /Gyrodinium sp.) and the pennate diatom Pseudo -nitzschia sp. Grazer biomass was dominated by copepods (Acartia clausi, Paracalanus parvus) and appendicularians (Oikopleura dioica). O. dioica showed non-selective clearance rates of 0.7-1.8 ml mu g C-1 h(-1) on most diatoms, flagellates and ciliates, whereas Pseudo -nitzschia sp. and dinoflagellates and ciliates > 25 mu m were not removed by O. dioica. Appendicularian grazing impact was 0.06% d(-1) on the phytoplankton and 0.4% d(-1) on bacterial biomass. Despite a seven-fold higher biomass, the grazing impact of copepods on phytoplankton biomass was only 0.28% d(-1) indicating that O. dioica had a proportionally greater impact and, in contrast to copepods, also utilised bacteria. The low observed grazing impact was due to a low grazer biomass and a prey community largely unavailable to the investigated grazers.
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Maar, M.
(author)
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Vargas, C.
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Moller, E. F.
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Satapoomin, S.
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Zervoudaki, S.
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Christou, E.
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Giannakourou, A.
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Sell, AnneGothenburg University,Göteborgs universitet,Institutionen för marin ekologi,Department of Marine Ecology
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Petersen, J. K.
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Nielsen, T. G.
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Tiselius, Peter,1958Gothenburg University,Göteborgs universitet,Institutionen för marin ekologi,Department of Marine Ecology(Swepub:gu)xtispe
(author)
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Göteborgs universitetInstitutionen för marin ekologi
(creator_code:org_t)
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In:Marine Biology Research: Informa UK Limited1:5, s. 365-3731745-10001745-1019
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Tönnesson, Kajsa ...
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Maar, M.
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Vargas, C.
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Moller, E. F.
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Satapoomin, S.
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Zervoudaki, S.
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Christou, E.
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Giannakourou, A.
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Sell, Anne
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Petersen, J. K.
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Nielsen, T. G.
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Tiselius, Peter, ...
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