Inter-individual variability and conspecific densities: consequences for population regulation and range expansion.

The presence of conspecifics can strongly modulate the quality of a breeding site. Both positive and negative effects of conspecifics can act on the same individuals, with the final balance between its costs and benefits depending on individual characteristics. A particular case of inter-individual...

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Autores principales:	Laura Cardador, Martina Carrete, Santi Mañosa
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/64a4ad0a1309451da84c2c612ad915ec
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spelling	oai:doaj.org-article:64a4ad0a1309451da84c2c612ad915ec2021-11-18T07:24:15ZInter-individual variability and conspecific densities: consequences for population regulation and range expansion.1932-620310.1371/journal.pone.0033375https://doaj.org/article/64a4ad0a1309451da84c2c612ad915ec2012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22479391/?tool=EBIhttps://doaj.org/toc/1932-6203The presence of conspecifics can strongly modulate the quality of a breeding site. Both positive and negative effects of conspecifics can act on the same individuals, with the final balance between its costs and benefits depending on individual characteristics. A particular case of inter-individual variation found in many avian species is chromatic variability. Among birds, plumage coloration can co-vary with morphology, physiology and behavior as well as with age. These relationships suggest that cost-benefit balances of conspecific presence may be different for individuals with different colorations. We investigated whether inter-individual variability affects population regulation and expansion processes by analyzing potential differences in density-dependent productivity and settlement patterns in relation to plumage coloration in a population of a long-lived avian species recently undergoing a notable increase in numbers and distribution range. Our results show strong variation in the effect of density on productivity of breeding pairs depending on plumage coloration of their members. Productivity of dark birds decreased along the breeding density gradient while that of lighter breeders remained unchanged with conspecific density. In a similar way, our results showed an uneven occupation of localities by individuals with different plumage coloration in relation to local densities, with the breeding of lighter harriers more aggregated than that of dark-brown ones. At a population scale, darker birds had higher probability of colonization of the most isolated, empty sites. Explanations for species range expansion and population regulation usually make the inferred assumption that species traits are similar among individuals. However, in most species, there could be individual variation in niche requirements or dispersal propensities among individuals with different traits. Our results contribute to the growing appreciation that the individual traits, but not the average trait at the level of species, are important during population regulation and expansion processes.Laura CardadorMartina CarreteSanti MañosaPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 3, p e33375 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Laura Cardador Martina Carrete Santi Mañosa Inter-individual variability and conspecific densities: consequences for population regulation and range expansion.
description	The presence of conspecifics can strongly modulate the quality of a breeding site. Both positive and negative effects of conspecifics can act on the same individuals, with the final balance between its costs and benefits depending on individual characteristics. A particular case of inter-individual variation found in many avian species is chromatic variability. Among birds, plumage coloration can co-vary with morphology, physiology and behavior as well as with age. These relationships suggest that cost-benefit balances of conspecific presence may be different for individuals with different colorations. We investigated whether inter-individual variability affects population regulation and expansion processes by analyzing potential differences in density-dependent productivity and settlement patterns in relation to plumage coloration in a population of a long-lived avian species recently undergoing a notable increase in numbers and distribution range. Our results show strong variation in the effect of density on productivity of breeding pairs depending on plumage coloration of their members. Productivity of dark birds decreased along the breeding density gradient while that of lighter breeders remained unchanged with conspecific density. In a similar way, our results showed an uneven occupation of localities by individuals with different plumage coloration in relation to local densities, with the breeding of lighter harriers more aggregated than that of dark-brown ones. At a population scale, darker birds had higher probability of colonization of the most isolated, empty sites. Explanations for species range expansion and population regulation usually make the inferred assumption that species traits are similar among individuals. However, in most species, there could be individual variation in niche requirements or dispersal propensities among individuals with different traits. Our results contribute to the growing appreciation that the individual traits, but not the average trait at the level of species, are important during population regulation and expansion processes.
format	article
author	Laura Cardador Martina Carrete Santi Mañosa
author_facet	Laura Cardador Martina Carrete Santi Mañosa
author_sort	Laura Cardador
title	Inter-individual variability and conspecific densities: consequences for population regulation and range expansion.
title_short	Inter-individual variability and conspecific densities: consequences for population regulation and range expansion.
title_full	Inter-individual variability and conspecific densities: consequences for population regulation and range expansion.
title_fullStr	Inter-individual variability and conspecific densities: consequences for population regulation and range expansion.
title_full_unstemmed	Inter-individual variability and conspecific densities: consequences for population regulation and range expansion.
title_sort	inter-individual variability and conspecific densities: consequences for population regulation and range expansion.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/64a4ad0a1309451da84c2c612ad915ec
work_keys_str_mv	AT lauracardador interindividualvariabilityandconspecificdensitiesconsequencesforpopulationregulationandrangeexpansion AT martinacarrete interindividualvariabilityandconspecificdensitiesconsequencesforpopulationregulationandrangeexpansion AT santimanosa interindividualvariabilityandconspecificdensitiesconsequencesforpopulationregulationandrangeexpansion
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Inter-individual variability and conspecific densities: consequences for population regulation and range expansion.

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