Grazing impact ofOikopleuradioicaand copepods on an autumn plankton communityPublished in collaboration with the University of Bergen and the Institute of Marine Research, Norway, and the Marine Biological Laboratory, University of Copenhagen, Denmark

Autor: Epaminondas Christou, Sultana Zervoudaki, Kajsa Tönnesson, Anne F. Sell, Torkel Gissel Nielsen, Jens Kjerulf Petersen, Peter Tiselius, Antonia Giannakourou, Eva Friis Møller, Marie Maar, Suree Satapoomin, Cristian A. Vargas
Rok vydání: 2005
Předmět:
Zdroj: Marine Biology Research. 1:365-373
ISSN: 1745-1019
1745-1000
DOI: 10.1080/17451000500396435
Popis: 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 µg C l−1 at the surface to 14 µg C l−1 at 30 m with a dominance of larger dinoflagellates (10–25 µm 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 µg C−1 h−1 on most diatoms, flagellates and ciliates, whereas Pseudo-nitzschia sp. and dinoflagellates and ciliates >25 µm were not removed by O. dioica. Appendicularian grazing impact was 0.06% d−1 on the phytoplankton and 0.4% d−1 on bacterial...
Databáze: OpenAIRE
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