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Cooperative Breeding in Gray Jays: Philopatric Offspring Provision Juvenile Siblings

Thomas A. Waite and Dan Strickland
The Condor
Vol. 99, No. 2 (May, 1997), pp. 523-525
DOI: 10.2307/1369960
Stable URL: http://www.jstor.org/stable/1369960
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Cooperative Breeding in Gray Jays: Philopatric Offspring Provision Juvenile Siblings
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Abstract

We present evidence for cooperative breeding in Gray Jays (Perisoreus canadensis), a species characterized by delayed dispersal but long thought not to exhibit the life-history tactic of helping. Our findings to date suggest that the alloparental care of younger siblings by philopatric yearlings is confined to the post-fledging period of nutritional dependence. We encourage other workers to investigate whether helping may be confined to this period in other semi-social species as well. Ongoing work is aimed at evaluating the fitness consequences of helping in our study population.

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