English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/103651
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Citado 29 veces en Web of Knowledge®  |  Pub MebCentral Ver citas en PubMed Central  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)
Título

Nonlinear effects of winter sea ice on the survival probabilities of Adélie penguins

Autor Ballerini, Tosca; Tavecchia, Giacomo ; Olmastorni, Silvia; Pezzo, Francesco; Focardi, Silvano
Palabras clave Southern Oscillation Index
Population dynamics
Life history
Capture-mark-recapture
Age dependence
Fecha de publicación 2-jul-2009
EditorSpringer
Citación Oecologia 161(2): 253-265 (2009)
ResumenThe population dynamics of Antarctic seabirds are influenced by variations in winter sea ice extent and persistence; however, the type of relationship differs according to the region and the demographic parameter considered. We used annual presence/absence data obtained from 1,138 individually marked birds to study the influence of environmental and individual characteristics on the survival of Adélie penguins Pygoscelis adeliae at Edmonson Point (Ross Sea, Antarctica) between 1994 and 2005. About 25% of 600 birds marked as chicks were reobserved at the natal colony. The capture and survival rates of Adélie penguins at this colony increased with the age of individuals, and five age classes were identified for both parameters. Mean adult survival was 0.85 (SE = 0.01), and no effect of sex on survival was evident. Breeding propensity, as measured by adult capture rates, was close to one, indicating a constant breeding effort through time. Temporal variations in survival were best explained by a quadratic relationship with winter sea ice extent anomalies in the Ross Sea, suggesting that for this region optimal conditions are intermediate between too much and too little winter sea ice. This is likely the result of a balance between suitable wintering habitat and food availability. Survival rates were not correlated with the Southern Oscillation Index. Low adult survival after a season characterized by severe environmental conditions at breeding but favorable conditions during winter suggested an additional mortality mediated by the reproductive effort. Adélie penguins are sensitive indicators of environmental changes in the Antarctic, and the results from this study provide insights into regional responses of this species to variability in winter sea ice habitat. © Springer-Verlag 2009.
Versión del editorhttp://dx.doi.org/10.1007/s00442-009-1387-9
URI http://hdl.handle.net/10261/103651
DOI10.1007/s00442-009-1387-9
Identificadoresdoi: 10.1007/s00442-009-1387-9
issn: 0029-8549
Aparece en las colecciones: (IMEDEA) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
accesoRestringido.pdf15,38 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 



NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.