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Article
P. Dee Boersma, Auteur ; Ginger A. Rebstock, AuteurEgg volume is often calculated from length and breadth, assuming little variation in egg shape within species. However, egg shape may vary among females, over time, or within clutches. If this variation is not predictable, volume should be estim[...]
Article
David L. Stokes, Auteur ; P. Dee Boersma, Auteur ; Javier Lopez de Casenave, Auteur ; Pablo Garcia-Borboroglu, AuteurConservation of migratory species requires an understanding of their migration path and pattern. We used band returns and satellite tracking to characterize the seasonal migration of Magellanic penguins breeding in southern Argentina, with the p[...]
Article
P. Dee Boersma, Auteur ; Ginger A. Rebstock, AuteurBanding penguins is controversial because bands can alter the survival, reproduction, and behavior of marked individuals. The effects of bands are not consistent among band types and, although stainless steel is thought to be better than other m[...]
Article
P. Dee Boersma, Auteur ; Ginger A. Rebstock, AuteurFlipper bands are used to mark penguins because leg bands can injure their legs. However, concerns remain over the possible effects of flipper bands on penguins. We examined the effects of stainless-steel flipper bands on the duration of foragin[...]
Article
P. Dee Boersma, Auteur ; Ginger A. Rebstock, AuteurMost penguin species lay two eggs 3-4 days apart that hatch 1-2 days apart. Hypotheses to explain the shorter incubation period for the second egg include differences in porosity of the eggshells. Eggs with more or larger pores and/or thinner sh[...]
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P. Dee Boersma, Auteur ; Ginger A. Rebstock, Auteur ; Pablo Garcia-Borboroglu, AuteurMagellanic penguins (Spheniscus magellanicus) are listed as near threatened by the IUCN. At their largest colony, Punta Tombo, Chubut, Argentina, active nests declined >30% over 30 years. Reproductive success is low, many penguins forage far fro[...]
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F. Hernan Vargas, Auteur ; Robert C. Lacy, Auteur ; Paul J. Johnson, Auteur ; Antje Steinfurth, Auteur ; Robert J. M. Crawford, Auteur ; P. Dee Boersma, Auteur ; David W. Macdonald, AuteurSmall populations are vulnerable to long-term declines, even where short-term censuses indicate increasing trends in numbers. Census data for the Galapagos penguin (Spheniscus mendiculus) collected between 1970 and 2004 provide evidence that des[...]
Article
Eric L. Wagner, Auteur ; Eleanor J. Lee, Auteur ; P. Dee Boersma, AuteurLife history theory predicts that parents will not raise unrelated offspring. For seabirds, an ability to recognize their own eggs and chicks can prevent a costly mistake. We tested whether Magellanic Penguins (Spheniscus magellanicus) would dis[...]
Article
Ginger A. Rebstock, Auteur ; Maria Laura Agueero, Auteur ; P. Dee Boersma, Auteur ; Luis Augusto Ebert, Auteur ; Agustina Gomez Laich, Auteur ; Nora Lisnizer, Auteur ; Walter S. Svagelj, Auteur ; M. Magdalena Trivellini, AuteurDans Ostrich (81(2) 2010)
