Can we use laboratory reared copepods for experiments - a comparison of feeding behavior and reproduction between a field and a laboratory population of Acartia tonsa

P. Tiselius, B. Hansen, P. Jonsson, Thomas Kiørboe, Torkel Gissel Nielsen, S. Piontkovski, E. Saiz

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Abstract

Motility patterns and egg production were investigated in two populations of Acartia tonsa, field animals from the Oresund and laboratory animals from a 12-year-old (approximate to 120 generations) culture. When observed in aquaria with a layer of Thalassiosira weissflogii in the middle, laboratory animals displayed weak aggregation behaviour, while field animals did not aggregate at all. Both populations made longer and more frequent feeding bouts inside the patch. Egg production measurements were in accordance with the behaviour of the laboratory population if no diel feeding rhythm was assumed. The held population produced fewer eggs than predicted from activity measurements, probably due to a diel feeding rhythm. It is concluded that laboratory reared A. tonsa can be used for experiments involving behaviour, but that the possible loss of diel rhythms should be a concern. Both populations differed considerably from held-caught A. tonsa from the eastern United States, where both behaviour and egg production changed consistently and in accordance with a strong aggregation in food patches. (C) 1995 International Council for the Exploration of the Sea
Original languageEnglish
JournalICES Journal of Marine Science
Volume52
Issue number3-4
Pages (from-to)369-376
ISSN1054-3139
Publication statusPublished - 1995

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