English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/64930
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:


Density-dependent productivity depression in Pyrenean Bearded Vultures: Implications for conservation

AuthorsCarrete, Martina ; Donázar, José A. ; Margalida, Antoni
Issue Date2006
PublisherEcological Society of America
CitationEcological Applications 16(5): 1674-1682 (2006)
AbstractThe main objective of many conservation programs is to increase population size by improving a species' survival and reproduction. However, density dependence of demographic parameters may confound this approach. In this study we used a 25-year data set on Bearded Vultures (Gypaetus barbatus) in Spain to evaluate the consequences of population growth on reproductive performance. Unlike its coefficient of variation (CV), mean annual productivity decreased with increasing population size. After controlling for territorial heterogeneity, productivity also was negatively related to the distance to the nearest conspecific breeding pair and to supplementary feeding points where floaters congregate. These results suggest that vulture populations are regulated as posited by the site-dependency hypothesis: as the population increases, average productivity decreases because progressively poorer territories are used. The combined effects of the shrinkage of territories and the presence of floaters around supplementary feeding points seem to be the main causes of productivity decline and are therefore the main determinants of territory quality. This has conservation implications, especially concerning the role of supplementary feeding points. Supplementary feeding should be reviewed given that its usefulness in reducing preadult mortality has not yet been proved and its effect on productivity, as our results suggest, is negative. © 2006 by the Ecological Society of America.
Publisher version (URL)https://doi.org/10.1890/1051-0761(2006)016[1674:DPDIPB]2.0.CO;2
Identifiersdoi: 10.1890/1051-0761(2006)016[1674:DPDIPB]2.0.CO;2
issn: 1051-0761
Appears in Collections:(EBD) Artículos
(IREC) Artículos
Files in This Item:
File Description SizeFormat 
ecol. Appl..pdf222,64 kBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.