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© 1996 International Society for Behavioral Ecology

research-article

Aggressiveness and kinship in brown trout (Salmo trutta) parr

K. Håkan Olséna, Torbjörn Järvib and Anna-Carin Löfc

aDepartment of Limnology, Vertebrate Physiology & Behaviour Unit, Uppsala University Norbyvagen 20, S-752 36 Uppsala, Sweden bInstitute of Freshwater Research, Swedish National Board of Fisheries S-170 11 Drottningholm, Sweden cFisheries Research Station, Swedish National Board of Fisheries Brobacken, S-810 70 Alvkarleby, Sweden

ABSTRACT

In a series of experiments, kin-biased behavior of young brown trout (Salmo trutta) was observed. The aggressiveness shown by groups of familiar siblings (siblings reared together since fertilization) and groups of unfamiliar siblings (siblings reared apart since fertilization) was significantly lower compared to that of mixed groups of two unrelated sibling groups (offspring of two different pairs of parents). The evolution of kin-biased behavior, as shown by a reduction in aggressiveness, is assumed to have evolved through a kin-selective mechanism.[Behav Ecol 7: 445-450 (1996)]

Key words: aggressiveness, brown trout, kin recognition, salmonids, siblings.


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 Behav EcolHome page
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