Phaeocystis blooming enhanced by copepod predation on protozoa: evidence from incubation experiments .

Hansen, F. C., Reckermann, M, Klein Breteler, W. C. M. and Riegman, R. (1993) Phaeocystis blooming enhanced by copepod predation on protozoa: evidence from incubation experiments . Open Access Marine Ecology Progress Series, 102 . pp. 51-57. DOI 10.3354/meps102051.

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Abstract

Laboratory experiments were carried out to investigate the effect of protozoan, copepod and combined grazing on Phaeocystis biomass. Phaeocystis cf. globosa single cells were offered to 3 different protozoan species, to the calanoid copepod Temora longicornis, as well as to mixtures of both grazer types. The heterotrophic dinoflagellate Oxyrrhis marina and the oligotrich ciliate Strombidinopsis acuminatum ingested Phaeocystis at much higher rates than did the copepod. Nevertheless, protozoan growth and ingestion rates were submaximal, indicating Phaeocystis to be suboptimal food.
The oligotrich ciliate Strombidium elegans did not feed on Phaeocystis. In grazing experiments with mixtures of both predator types, the decline of Phaeocystis single cells could be explained by protozoan grazing alone, implying no grazing by the copepods on Phaeocystis. Instead, copepods ingested the protozoans at high rates. Predation on 0. marina and S. acuminatum by T. longicornis resulted in a
reduction of the total grazing pressure on Phaeocystis of 21 and 67 % respectively. We conclude that mesozooplankton predation on herbivorous ciliates and heterotrophic dinoflagellates, which consumed Phaeocystis cells, can considerably reduce the overall grazing pressure and may enhance Phaeocystis
bloomng.

Document Type: Article
Keywords: Ciliates; Copepods; Dinoflagellates; Grazing; Oxyrrhis marina; Phaeocystis; Predation; Selective feeding; Strombidinopsis acuminatum; Strombidium elegans; Temora longicornis
Research affiliation: OceanRep > Institute for Marine Science Kiel
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.3354/meps102051
ISSN: 0171-8630
Date Deposited: 07 Mar 2018 10:59
Last Modified: 07 Mar 2018 10:59
URI: http://oceanrep.geomar.de/id/eprint/42177

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