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Grazing impact of O...
Grazing impact of Oikopleura dioica and copepods on an autumn plankton community
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- Tönnesson, Kajsa, 1971 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för marin ekologi,Department of Marine Ecology
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Maar, M. (author)
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Vargas, C. (author)
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Moller, E. F. (author)
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Satapoomin, S. (author)
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Zervoudaki, S. (author)
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Christou, E. (author)
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Giannakourou, A. (author)
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- Sell, Anne (author)
- Gothenburg University,Göteborgs universitet,Institutionen för marin ekologi,Department of Marine Ecology
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Petersen, J. K. (author)
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Nielsen, T. G. (author)
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- Tiselius, Peter, 1958 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för marin ekologi,Department of Marine Ecology
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(creator_code:org_t)
- Informa UK Limited, 2005
- 2005
- English.
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In: Marine Biology Research. - : Informa UK Limited. - 1745-1000 .- 1745-1019. ; 1:5, s. 365-373
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https://doi.org/10.1...
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Abstract
Subject headings
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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.
Subject headings
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Keyword
- grazing
- Oikopleura dioica
- copepods
- FUNCTIONAL-RESPONSE
- CALANOID COPEPODS
- APPENDICULARIANS
- SIZE
- PHYTOPLANKTON
- POPULATION
- MICROSCOPY
- PARTICLES
- SKAGERRAK
- TUNICATA
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
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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.
-
Zervoudaki, S.
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show more...
-
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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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Biological Scien ...
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and Ecology
- Articles in the publication
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Marine Biology R ...
- By the university
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University of Gothenburg