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Documents disponibles écrits par cet auteur (8)
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Article
Marjorie C. Sorensen, Auteur ; J. Mark Hipfner, Auteur ; T. Kurt Kyser, Auteur ; D. Ryan Norris, AuteurUnderstanding the interactions between different periods of the annual cycle in migratory animals has been constrained by our inability to track individuals across seasons. In seabirds, virtually nothing is known about how diet quality during th[...]
Article
Amy-Lee Kouwenberg, Auteur ; J. Mark Hipfner, Auteur ; Donald W. McKay, Auteur ; Anne E. Storey, AuteurExamining factors that operate outside the breeding season may provide new insights into life-history traits such as egg size, in which individual variation has not been fully explained. We measured corticosterone (CORT) levels and 15N values (t[...]
Article
J. Mark Hipfner, Auteur ; Laura A. McFarlane-Tranquilla, Auteur ; BriAnne Addison, AuteurAccording to the environmental cues hypothesis, female birds use information available to them in the early-season environment to fine-tune egg production annually. However, support for the hypothesis derives largely from correlational studies. [...]
Article
Karen Zimmermann, Auteur ; J. Mark Hipfner, Auteur ; A. E. Burger, AuteurAbstract Although the ultimate factors that influence the duration of avian incubation periods are well known, we know much less about the proximate mechanisms by which birds adjust incubation period in response to selection. We tested the hypot[...]
Article
Gwylim S. Blackburn, Auteur ; J. Mark Hipfner, Auteur ; Ronald C. Ydenberg, AuteurPredation, foraging and mating costs are critical factors shaping life histories. Among colonial seabirds, colony overflights may enhance foraging or mating success, or diminish the risk of predation and kleptoparasitism. The latter possibility [...]
Article
J. Mark Hipfner, Auteur ; Moira J. F. Lemon, Auteur ; Michael S. Rodway, AuteurThe Scott Islands, British Columbia, Canada, support the largest aggregation of breeding seabirds in the eastern Pacific Ocean south of Alaska. However, large seabird populations were eradicated by American Mink Neovison vison and Raccoons Procy[...]
Article
Marjorie C. Sorensen, Auteur ; J. Mark Hipfner, Auteur ; T. Kurt Kyser, Auteur ; D. Ryan Norris, AuteurUnderstanding the mechanisms that influence variation in sexually selected ornaments in seabirds has been challenging owing to the difficulty of capturing and sampling individuals outside of the breeding period when ornaments are usually grown. [...]
Article
J. Mark Hipfner, Auteur ; Laura McFarlane-Tranquilla, Auteur ; BriAnne Addison, Auteur ; Keith A. Hobson, AuteurWe used delta N-15 and delta C-13 stable isotope analysis on blood drawn from adult and nestling Rhinoceros Auklets (Cerorhinca monocerata) in 4 years to answer two questions: (1) do adults tend to feed at higher trophic level while provisioning[...]
