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Behavioral Ecology Vol. 10 No. 5: 493-497
© 1999 International Society for Behavioral Ecology

No sibling odor preference in juvenile three-spined sticklebacks

Nicole Steck, Claus Wedekind and Manfred Milinski

Abteilung Verhaltensökologie, Universität Bern, Wohlenstrasse 50a, CH-3032 Hinterkappelen, Switzerland

Address correspondence to M. Milinski. E-mail: manfred.milinski{at}esh.unibe.ch .

Laboratory-bred juvenile three-spined sticklebacks from 11 sibships did not prefer to shoal with their siblings when they were offered the choice between odor from unfamiliar siblings and non-kin in a fluviarium, although the power for finding a significant preference was very high (0.99). The test fish preferred the side where odor from the heavier shoal was supplied; this shows that they could appreciate odor cues from conspecifics in our apparatus and should have preferred their siblings if such a preference exists. Our results are compatible with theoretical predictions but are at variance with previous findings by other authors. We used independent replicates in a blind protocol with strict randomization of fish and procedures.

Key words: Gasterosteus aculeatus, kin preference, odor, shoaling behavior, sticklebacks.


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