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Documents disponibles écrits par cet auteur (6)
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Article
David L. Swanson, Auteur ; Reza Goljani Amirkhiz, AuteurAnecdotal observations of mid-summer arrival of Blue Grosbeaks (Passerina caerulea) in South Dakota, in the northern portion of their breeding range, suggest that this species may show a pattern of arrival at the northern breeding grounds that d[...]
Article
David L. Swanson, Auteur ; François Vézina, AuteurSmall birds inhabiting regions with cold winter climates show seasonally flexible metabolic phenotypes, with the winter phenotype characterized by increments of summit metabolic rate (Msum) and cold tolerance. In the study reported here, we focu[...]
Article
Joseph R. Jehl, Auteur ; ANNETTE E. HENRY, Auteur ; David L. Swanson, AuteurThe eared grebe Podiceps nigricollis shows seasonal variation in the relative size of the major flight muscles that lift and lower the wing: respectively, supracoracoideus (s) and pectoralis (p). S/p ratios are low (approximate to 0.07-0.12) whe[...]
Article
David L. Swanson, Auteur ; Chris Merkord, AuteurChanges in flight muscle size are important mediators of phenotypic flexibility in birds, so the ability to track such changes over time in individual birds is a valuable tool for investigating phenotypic flexibility. Ultrasonography has been us[...]
Article
David L. Swanson, Auteur ; Jeffrey S. Palmer, AuteurIn apparent response to recent periods of global warming, some migratory birds now arrive earlier at stopover sites and breeding grounds. However, the effects of this warming on arrival times vary among locations and species. Migration timing is[...]
Article
Ming Liu, Auteur ; David L. Swanson, AuteurStopover behavior of migrant birds is influenced by their energetic condition, but also by extrinsic factors, including weather conditions and habitat attributes such as vegetation structure, microclimates, predation pressure, competition, and f[...]
