Density-dependent regulation of population size in colonial breeders: allee and buffer effects in the migratory Montagu's harrier
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http://hdl.handle.net/10045/7310
Títol: | Density-dependent regulation of population size in colonial breeders: allee and buffer effects in the migratory Montagu's harrier |
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Títol alternatiu: | Regulación denso-dependiente del tamaño de población en especies de reproducción colonial: efecto Allee y efecto buffer en una especie migradora como el Aguilucho cenizo |
Autors: | Soutullo, Alvaro | Limiñana, Rubén | Urios, Vicente | Surroca Royo, Martín | Gill, Jennifer A. |
Grups d'investigació o GITE: | Zoología de Vertebrados |
Centre, Departament o Servei: | Universidad de Alicante. Departamento de Ciencias Ambientales y Recursos Naturales | Centro de Recuperación de Fauna “Forn del Vidre” | University of East Anglia. School of Biological Sciences |
Paraules clau: | Allee effect | Buffer effect | Density dependence | Ideal despotic distribution | Ideal free distribution |
Àrees de coneixement: | Ornitología |
Data de creació: | 24-de gener-2006 |
Data de publicació: | 23-de juny-2006 |
Editor: | Springer Berlin / Heidelberg |
Citació bibliogràfica: | SOUTULLO BUGALLO, Álvaro Alberto, et al. "Density-dependent regulation of population size in colonial breeders: allee and buffer effects in the migratory Montagu's harrier". Oecologia. Vol. 149, No. 3 (Sept. 2006). ISSN 0029-8549, pp. 543-552 |
Resum: | Expanding populations offer an opportunity to uncover the processes driving spatial variation in distribution and abundance. Individual settlement decisions will be influenced by the availability and relative quality of patches, and by how these respond to changes in conspecific density. For example, conspecific presence can alter patch suitability through reductions in resource availability or territorial exclusion, leading to buffer effect patterns of disproportionate population expansion into poorer quality areas. However, conspecific presence can also enhance patch suitability through Allee effect processes, such as transmission of information about resources or improved predator detection and deterrence. Here, we explore the factors underlying the settlement pattern of a growing population of Montagu’s harriers (Circus pygargus) in Spain. The population increased exponentially between 1981 and 2001, but stabilised between 2001 and 2004. This population increase occurred alongside a remarkable spatial expansion, with novel site use occurring prior to maximum densities in occupied sites being reached. However, no temporal trends in fecundity were observed and, within sites, average fecundity did not decline with increasing density. Across the population, variance in productivity did increase with population size, suggesting a complex pattern of density-dependent costs and benefits. We suggest that both Allee and buffer effects are operating in this system, with the benefits of conspecific presence counteracting density-dependent declines in resource availability or quality. |
Patrocinadors: | Fundación Terra Natura; Aeropuerto de Castellón |
URI: | http://hdl.handle.net/10045/7310 |
ISSN: | 0029-8549 (Print) | 1432-1939 (Online) |
DOI: | 10.1007/s00442-006-0465-5 |
Idioma: | eng |
Tipus: | info:eu-repo/semantics/article |
Drets: | The original publication is available at www.springerlink.com |
Revisió científica: | si |
Versió de l'editor: | http://dx.doi.org/10.1007/s00442-006-0465-5 |
Apareix a la col·lecció: | INV - ZV - Artículos Científicos INV - CYT - Otros Trabajos de Investigación |
Arxius per aquest ítem:
Arxiu | Descripció | Tamany | Format | |
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density_oecologia.pdf | 913,17 kB | Adobe PDF | Obrir Vista prèvia | |
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