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Documents disponibles écrits par cet auteur (7)
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Article
Joseph R. Jehl, Auteur ; Samuel Miller, Auteur
Article
Grebes are unique among birds in ingesting their own feathers. This behavior and the subsequent ejection of feathers as pellets have long puzzled ornithologists, who have tended to treat feather-eating and pellet-casting as independent behaviors[...]
Ouvrage
Article
Keith A. Hobson, Auteur ; Joseph R. Jehl, AuteurBirds migrating annually to high-latitude breeding grounds may benefit from the transport of endogenous nutrient reserves that ultimately contribute to reproduction. Shorebirds represent a diverse group of Arctic breeders that typically arrive o[...]
Article
Joseph R. Jehl, Auteur ; ANNETTE E. HENRY, AuteurAdjustments in body composition over the annual cycle have been documented in many organs and muscle groups. Here we consider the nature and significance of intra-organ variation in the eared grebe Podiceps nigricollis stomach, a large and varia[...]
Article
Lorian Cobra Straker, Auteur ; Joseph R. Jehl, AuteurEared grebes Podiceps nigricollis, like shorebirds and other long-distance migrants, lay down large amounts of fat to power their journeys. To investigate the pattern of how fat and soft tissue might be mobilized, we used grebes killed in migrat[...]
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[...]
