Results 251 to 260 of about 246,250 (308)
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Immunocompetent birds choose larger breeding colonies
Journal of Animal Ecology, 2021Abstract Optimal size of social groups may vary between individuals, depending on their phenotypic traits, such as dominance status, age or personality. Larger social groups often enhance transmission rates of pathogens and should be avoided by individuals with poor immune defences.
Joanna Drzewińska‐Chańko +5 more
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Northwestern Naturalist, 2003
Washington. Portland, OR: USDA Forest Service, Pacific Northwest Region. Volume 1, 332 p, and Volume 2, 302 p. FRANKLIN JF, DYRNESS CT. 1973. Natural vegetation of Oregon and Washington. Portland, OR: USDA Forest Service, Pacific Northwest Forest and Range Experiment Station. General Technical Report, PNW-8. 417 p. FRANKLIN JF, DYRNESS CT.
Aaron L. Holmes +4 more
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Washington. Portland, OR: USDA Forest Service, Pacific Northwest Region. Volume 1, 332 p, and Volume 2, 302 p. FRANKLIN JF, DYRNESS CT. 1973. Natural vegetation of Oregon and Washington. Portland, OR: USDA Forest Service, Pacific Northwest Forest and Range Experiment Station. General Technical Report, PNW-8. 417 p. FRANKLIN JF, DYRNESS CT.
Aaron L. Holmes +4 more
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Nature, 1968
Ecological Adaptations for Breeding in Birds By David Lack. Pp. xii + 409. (Methuen: London, July 1968.) 84s.
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Ecological Adaptations for Breeding in Birds By David Lack. Pp. xii + 409. (Methuen: London, July 1968.) 84s.
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1990
Cooperative breeding is an unusual kind of social behaviour, found in a few hundred species worldwide, in which individuals other than the parents help raise young. Understanding the apparently altruistic behaviour of helpers has provided numerous challenges to evolutionary biologists.
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Cooperative breeding is an unusual kind of social behaviour, found in a few hundred species worldwide, in which individuals other than the parents help raise young. Understanding the apparently altruistic behaviour of helpers has provided numerous challenges to evolutionary biologists.
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THE BREEDING BIRDS OF BERMUDA.
Ibis, 1957Summary. The Bermudas are a small group of oceanic islets 600 miles from land in the eastern North Atlantic. This paper is an attempt to define the unusual features of the ornithology based upon personal experience from 1940 to 1944 and a review of the literature.
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Relationships Between Migration and Breeding Strategies in Arctic Breeding Birds
2003For successful breeding, good timing is of the utmost importance for birds inhabiting seasonal environments. Seasonal declines in reproductive success have been well documented in birds (e.g. Perrins 1970; Verhulst et al. 1995) and shown to be causally related to the timing of breeding (e.g. Verhulst et al. 1995; Brinkhof and Cave 1997).
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