Feeding behaviour of adult Centropages hamatus (Copepoda, Calanoida): Functional response and selective feeding experiments.

Saage, Andrea, Vadstein, O. and Sommer, Ulrich (2009) Feeding behaviour of adult Centropages hamatus (Copepoda, Calanoida): Functional response and selective feeding experiments. Journal of Sea Research, 62 . pp. 16-21. DOI 10.1016/j.seares.2009.01.002.

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Abstract

The feeding behaviour of adults of the marine calanoid copepod Centropages hamatus was studied in laboratory experiments with ciliates and phytoplankton as food sources. The ingestion rate of algal (flagellates, diatoms) and ciliate prey (oligotrichs) as a function of prey concentration could be described by a Holling type III functional response. with close to zero ingestion rates at concentrations below 5 mu g Cl-1. In general, ingestion of ciliates was higher than ingestion of algae, and maximum feeding rates by adult males reached were half the feeding rates of adult females at prey concentrations exceeding 50 mu g Cl-1. When diatoms and ciliates were offered together C. hamatus (both sexes) fed exclusively on ciliates as long as they contributed with more than 5% to the mixture. This indicates the capability of active prey selection and switching between suspension feeding and ambush predation. Therefore, the feeding behaviour of adult C hamaths can be characterised as omnivorous with a preference for larger motile prey. This implies a trophic level above two, if there is a sufficient abundance of protozoan food available. (C) 2009 Elsevier B.V. All rights reserved.

Document Type: Article
Keywords: Centropages hamatus; Feeding behaviour; Functional response; Selective feeding; Ciliates Diatoms; Flagellates;
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.seares.2009.01.002
ISSN: 1385-1101
Projects: Future Ocean
Date Deposited: 12 Jun 2009 09:54
Last Modified: 19 Jul 2017 07:55
URI: http://oceanrep.geomar.de/id/eprint/2165

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