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Behavioral Ecology Vol. 14 No. 2: 246-250
© 2003 International Society for Behavioral Ecology

Nepotistic vigilance behavior in Siberian jay parents

Michael Griesser

Department of Population Biology, Evolutionary Biology Centre, Norbyvägen 18D, SE-75236 Uppsala, Sweden

Address correspondence to M. Griesser. E-mail: michael.griesser{at}ebc.uu.se.

Many Siberian jay offspring (up to 50%) postpone independence and stay with their parents for up to 3 years. Parents offer such nondispersers a benefit in that they increase their vigilance while feeding together with retained offspring. In contrast, parents reduce their vigilance while in company of nonrelated flock members according to the "many eyes" principle. The preferential treatment offered by the parents provides an incentive for offspring to forego dispersal. Given evidence for mortality via surprise attacks by predators (goshawks), such nepotistic vigilance by parents could have a bearing on offspring survival and thereby promote delayed dispersal.

Key words: delayed dispersal, nepotistic vigilance, kin groups, Perisoreus infaustus, Siberian jays.


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