منابع مشابه
Cooperative nest defence in red-winged blackbirds: reciprocal altruism, kinship or by-product mutualism?
Male red-winged blackbirds (Agelaius phoeniceus) often cooperate with their neighbours in defending nests against predators. Some studies have suggested that this is an example of by-product mutualism, whereas others have suggested the possibility of reciprocal altruism. No study has addressed the possibility of kin-selected cooperation in nest defence in this species. Reciprocal altruism, kin ...
متن کاملNest building by birds
state and at a private university. Despite the great diversity among them, there is a common theme. All universities have flaws, but the ideal is a universal one, a place where scholars are free to study and teach, and young people to learn. Robert Maynard Hutchins was chancellor of the University of Chicago when I was an undergraduate student. At the time, Senator Joseph McCarthy was attacking...
متن کاملA Comparative Study of Cowbird Parasitism in Yellow-headed Blackbirds and Red-winged Blackbirds
--We compared Yellow-headed Blackbirds (Xanthocephalus xanthocephalus) and Red-winged Blackbirds (Agelaius phoeniceus) to determine possible explanations for the lack of Brown-headed Cowbird (Molothrus ater) parasitism on Yellow-heads. Twenty-three cowbird eggs were cross-fostered from Red-winged Blackbird nests to Yellow-headed Blackbird nests. Eleven of the cross-fostered cowbird eggs hatched...
متن کاملDoes Nonrandom Nest Placement Imply Nonrandom Nest Predation?: a Reply
In response to the critique by Schmidt and Whelan (1999), we find that the relationship between nest success and tree selectivity is dependent upon inclusion or exclusion of particular tree species, whether or not years are pooled, and the selectivity index used. We question their use of point estimates of nest success with extremely high variances, defend our index, question the application of...
متن کاملNest Predation and Nest Sites
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ژورنال
عنوان ژورنال: Nature
سال: 1897
ISSN: 0028-0836,1476-4687
DOI: 10.1038/056248f0