Habitat suitability-density relationship in an endangered woodland species: The case of the Blue Chaffinch (Fringilla polatzeki)

Background. Understanding constraints to the distribution of threatened species may help to ascertain whether there are other suitable sectors for reducing the risks associated with species that are recorded in only one protected locality, and to inform about the suitability of other areas for reint...

ver descrição completa

Detalhes bibliográficos
Autores: Carrascal, Luis M., Moreno, Ángel C., Delgado, Alejandro, Suárez, Víctor, Trujillo, Domingo
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/158727
Acesso em linha:http://hdl.handle.net/10261/158727
Access Level:acceso abierto
Palavra-chave:Canary Islands
Blue chaffinch
Abundance
And density
Habitat suitability modelling
Population size
suitability relationship
id ES_72f00d2c8f694eb516a169dd1d9301fa
oai_identifier_str oai:digital.csic.es:10261/158727
network_acronym_str ES
network_name_str España
repository_id_str
spelling Habitat suitability-density relationship in an endangered woodland species: The case of the Blue Chaffinch (Fringilla polatzeki)Carrascal, Luis M.Moreno, Ángel C.Delgado, AlejandroSuárez, VíctorTrujillo, DomingoCanary IslandsBlue chaffinchAbundanceAnd densityHabitat suitability modellingPopulation sizesuitability relationshipBackground. Understanding constraints to the distribution of threatened species may help to ascertain whether there are other suitable sectors for reducing the risks associated with species that are recorded in only one protected locality, and to inform about the suitability of other areas for reintroduction or translocation programs. Methods. We studied the Gran Canaria blue chaffinch (Fringilla polatzeki), a habitat specialist endemic of the Canary Islands restricted to the pine forest of Inagua, the only area where the species has been naturally present as a regular breeder in the last 25 years. A suitability distribution model using occurrences with demographic relevance (i.e., nest locations of successful breeding attempts analysed using boosted classification trees) was built considering orographic, climatic and habitat structure predictors. By means of a standardized survey program we monitored the yearly abundance of the species in 100 sectors since the declaration of Inagua as a Strict Nature Reserve in 1994. Results. The variables with the highest relative importance in blue chaffinch habitat preferences were pine height, tree cover, altitude, and rainfall during the driest trimester (July-September). The observed local abundance of the blue chaffinch in Inagua (survey data) was significantly correlated with habitat suitability derived from modelling the location of successful nesting attempts (using linear and quantile regressions). The outcomes of the habitat suitability model were used to quantify the suitability of other natural, historic, pine forests of Gran Canaria. Tamadaba is the forest with most suitable woodland patches for the species. We estimated a population size of 195-430 blue chaffinches in Inagua since 2011 (95% CI), the smallest population size of a woodland passerine in the Western Palearctic. Discussion. Habitat suitability obtained from modelling the location of successful breeding attempts is a good surrogate of the observed local abundance during the reproductive season. The outcomes of these models can be used for the identification of potential areas for the reintroduction of the species in other suitable pine forests and to inform forest management practices.Peer ReviewedPeerJConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2018201820172018info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/158727reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1587272026-05-22T06:33:51Z
dc.title.none.fl_str_mv Habitat suitability-density relationship in an endangered woodland species: The case of the Blue Chaffinch (Fringilla polatzeki)
title Habitat suitability-density relationship in an endangered woodland species: The case of the Blue Chaffinch (Fringilla polatzeki)
spellingShingle Habitat suitability-density relationship in an endangered woodland species: The case of the Blue Chaffinch (Fringilla polatzeki)
Carrascal, Luis M.
Canary Islands
Blue chaffinch
Abundance
And density
Habitat suitability modelling
Population size
suitability relationship
title_short Habitat suitability-density relationship in an endangered woodland species: The case of the Blue Chaffinch (Fringilla polatzeki)
title_full Habitat suitability-density relationship in an endangered woodland species: The case of the Blue Chaffinch (Fringilla polatzeki)
title_fullStr Habitat suitability-density relationship in an endangered woodland species: The case of the Blue Chaffinch (Fringilla polatzeki)
title_full_unstemmed Habitat suitability-density relationship in an endangered woodland species: The case of the Blue Chaffinch (Fringilla polatzeki)
title_sort Habitat suitability-density relationship in an endangered woodland species: The case of the Blue Chaffinch (Fringilla polatzeki)
dc.creator.none.fl_str_mv Carrascal, Luis M.
Moreno, Ángel C.
Delgado, Alejandro
Suárez, Víctor
Trujillo, Domingo
author Carrascal, Luis M.
author_facet Carrascal, Luis M.
Moreno, Ángel C.
Delgado, Alejandro
Suárez, Víctor
Trujillo, Domingo
author_role author
author2 Moreno, Ángel C.
Delgado, Alejandro
Suárez, Víctor
Trujillo, Domingo
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Canary Islands
Blue chaffinch
Abundance
And density
Habitat suitability modelling
Population size
suitability relationship
topic Canary Islands
Blue chaffinch
Abundance
And density
Habitat suitability modelling
Population size
suitability relationship
description Background. Understanding constraints to the distribution of threatened species may help to ascertain whether there are other suitable sectors for reducing the risks associated with species that are recorded in only one protected locality, and to inform about the suitability of other areas for reintroduction or translocation programs. Methods. We studied the Gran Canaria blue chaffinch (Fringilla polatzeki), a habitat specialist endemic of the Canary Islands restricted to the pine forest of Inagua, the only area where the species has been naturally present as a regular breeder in the last 25 years. A suitability distribution model using occurrences with demographic relevance (i.e., nest locations of successful breeding attempts analysed using boosted classification trees) was built considering orographic, climatic and habitat structure predictors. By means of a standardized survey program we monitored the yearly abundance of the species in 100 sectors since the declaration of Inagua as a Strict Nature Reserve in 1994. Results. The variables with the highest relative importance in blue chaffinch habitat preferences were pine height, tree cover, altitude, and rainfall during the driest trimester (July-September). The observed local abundance of the blue chaffinch in Inagua (survey data) was significantly correlated with habitat suitability derived from modelling the location of successful nesting attempts (using linear and quantile regressions). The outcomes of the habitat suitability model were used to quantify the suitability of other natural, historic, pine forests of Gran Canaria. Tamadaba is the forest with most suitable woodland patches for the species. We estimated a population size of 195-430 blue chaffinches in Inagua since 2011 (95% CI), the smallest population size of a woodland passerine in the Western Palearctic. Discussion. Habitat suitability obtained from modelling the location of successful breeding attempts is a good surrogate of the observed local abundance during the reproductive season. The outcomes of these models can be used for the identification of potential areas for the reintroduction of the species in other suitable pine forests and to inform forest management practices.
publishDate 2017
dc.date.none.fl_str_mv 2017
2018
2018
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/158727
url http://hdl.handle.net/10261/158727
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv PeerJ
publisher.none.fl_str_mv PeerJ
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869410772406239232
score 15,812455

Registos relacionados