English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/62557
Share/Impact:
Statistics
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:

Title

Variations in the age of mates as an early warning signal of changes in population trends? The case of Bonelli's eagle in Andalusia

AuthorsBalbontín, Javier; Penteriani, Vincenzo ; Ferrer, Miguel
Issue Date2003
PublisherElsevier
CitationBiological Conservation 109: 417- 423 (2003)
AbstractMethods to evaluate population trends have recently received particular attention because of the decreasing patterns shown by several species since the nineteenth century. We have studied demographic traits of the Bonelli's eagle (Hieraaetus fasciatus) population of Andalusia (southern Spain) for 20 years (1980-2000). This species is endangered and is suffering a rapid decline in most of its distribution range. Although our study population has remained stable for the last 10 years, both age at first breeding and productivity have decreased during the last 5 years. We propose that age at first breeding could be used as a potential early warning signal to detect possible future changes in population trends of long-lived species with deferred maturation age. In particular, in this species spatial variation in demographic traits could help to detect whether unnatural events such as shooting are decreasing age at first breeding and productivity. If occupation of territories by non-adults is caused by human persecution, conservation efforts in the particular case of Bonelli's eagle have to be directed to protect those breeding territories where an increase in the percentage of pairs containing at least one non-adult individual would be detected. © 2002 Elsevier Science Ltd. All rights reserved.
URIhttp://hdl.handle.net/10261/62557
DOI10.1016/S0006-3207(02)00168-4
Identifiersdoi: 10.1016/S0006-3207(02)00168-4
issn: 0006-3207
Appears in Collections:(EBD) Artículos
Files in This Item:
File Description SizeFormat 
biol.con.pdf394,6 kBAdobe PDFThumbnail
View/Open
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.