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Brood sex ratios in Merlins reflect characteristics of the associated breeding male and population density

Ian G. Warkentin, Auteur ; Darin W. Brooks, Auteur ; David J. Lieske, Auteur ; Richard H. M. Espie, Auteur ; Paul C. James, Auteur

Dans Ibis (165(2) February, 2023)

Population-level estimates of offspring sex ratios in birds typically approximate parity whereas biased ratios within nests are not uncommon. In sexually dimorphic raptors, the costs and relative fitness benefits of rearing male and female proge[...]

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Variation in selection pressure acting on body size by age and sex in a reverse sexual size dimorphic raptor

Ian G. Warkentin, Auteur ; Richard H. M. Espie, Auteur ; David J. Lieske, Auteur ; Paul C. James, Auteur

Dans Ibis (158(3) July 2016)

Body size strongly influences fitness, with larger individuals benefiting in terms of both greater productivity and survivorship; for reverse sexual size dimorphic (RSD) species, this relationship may be more complex. We examined the selection p[...]

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Maps, models, and marine vulnerability: Assessing the community distribution of seabirds at-sea

David J. Lieske, Auteur ; David A. Fifield, Auteur ; Carina Gjerdrum, Auteur

Dans Biological Conservation (172 APR 2014)

Whether considering the cumulative impact of chronic, small-size oil discharges or accidents associated with marine traffic and offshore oil and gas development, seabirds face a variety of threats in the marine environment. Assessing the vulnera[...]

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