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Article

Nest cavity orientation in black-capped chickadees Poecile atricapillus: do the acoustic properties of cavities influence sound reception in the nest and extra-pair matings?

D. J. Mennill, Auteur ; L. M. Ratcliffe, Auteur

Dans Journal of Avian Biology (35(6) NOV 2004)

Birds that nest in cavities may regulate nest microclimate by orienting their nest entrance relative to the sun or prevailing winds. Alternatively, birds may orient their nest entrance relative to conspecific individuals around them, especially [...]

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Article

Sex allocation in black-capped chickadees Poecile atricapilla

S. M. Ramsay, Auteur ; D. J. Mennill, Auteur ; K. A. Otter, Auteur ; L. M. Ratcliffe, Auteur ; P. T. Boag, Auteur

Dans Journal of Avian Biology (34(2) JUN 2003)

Optimal sex allocation for individuals can be predicted from a number of different hypotheses. Fisherian models of sex allocation predict equal investment in males and females up to the end of parental care and predict brood compositions based o[...]

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Article

Tracking habitat use of a long-distance migratory bird, the American redstart Setophaga ruticilla, using stable-carbon isotopes in cellular blood

D. R. Norris, Auteur ; P. P. Marra, Auteur ; T. K. Kyser, Auteur ; L. M. Ratcliffe, Auteur

Dans Journal of Avian Biology (36(2) MAR 2005)

The successful use of stable isotopes to track migratory animals between different seasons of the annual cycle depends, in part, on the turnover rate of isotopes in sample tissue. We examined whether stable-carbon isotopes in the blood of a long[...]

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