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Grazing impact of Oikopleura dioica and copepods on an autumn plankton community

Artikel i vetenskaplig tidskrift
Författare Kajsa Tönnesson
M. Maar
C. Vargas
E. F. Moller
S. Satapoomin
S. Zervoudaki
E. Christou
A. Giannakourou
Anne Sell
J. K. Petersen
T. G. Nielsen
Peter Tiselius
Publicerad i Marine Biology Research
Volym 1
Nummer/häfte 5
Sidor 365-373
ISSN 1745-1000
Publiceringsår 2005
Publicerad vid Institutionen för marin ekologi
Sidor 365-373
Språk en
Länkar dx.doi.org/10.1080/1745100050039643...
Ämnesord grazing, Oikopleura dioica, copepods, FUNCTIONAL-RESPONSE, CALANOID COPEPODS, APPENDICULARIANS, SIZE, PHYTOPLANKTON, POPULATION, MICROSCOPY, PARTICLES, SKAGERRAK, TUNICATA
Ämneskategorier Ekologi

Sammanfattning

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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