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dc.contributor.authorGonzález, Elena G.-
dc.contributor.authorCerón-Souza, Ivania-
dc.contributor.authorMateo, José Antonio-
dc.contributor.authorZardoya, Rafael-
dc.identifier.citationBMC Genetics 15: 121 (2014)es_ES
dc.description.abstract[Background] The giant lizard of La Gomera (Gallotia bravoana), is an endemic lacertid of this Canary Island that lives confined to a very restricted area of occupancy in a steep cliff, and is catalogued as Critically Endangered by IUCN. We present the first population genetic analysis of the wild population as well as of captive-born individuals (for which paternity data are available) from a recovery center. Current genetic variability, and inferred past demographic changes were determined in order to discern the relative contribution of natural versus human-mediated effects on the observed decline in population size.es_ES
dc.description.abstract[Results] Genetic analyses indicate that the only known natural population of the species shows low genetic diversity and acts as a single evolutionary unit. Demographic analyses inferred a prolonged decline of the species for at least 230 generations. Depending on the assumed generation time, the onset of the decline was dated between 1200–13000 years ago. Pedigree analyses of captive individuals suggest that reproductive behavior of the giant lizard of La Gomera may include polyandry, multiple paternity and female long-term sperm retention.es_ES
dc.description.abstract[Conclusions] The current low genetic diversity of G. bravoana is the result of a long-term gradual decline. Because generation time is unknown in this lizard and estimates had large credibility intervals, it is not possible to determine the relative contribution of humans in the collapse of the population. Shorter generation times would favor a stronger influence of human pressure whereas longer generation times would favor a climate-induced origin of the decline. In any case, our analyses show that the wild population has survived for a long period of time with low levels of genetic diversity and a small effective population size. Reproductive behavior may have acted as an important inbreeding avoidance mechanism allowing the species to elude extinction. Overall, our results suggest that the species retains its adaptive potential and could restore its ancient genetic diversity under favorable conditions. Therefore, management of the giant lizard of La Gomera should concentrate efforts on enhancing population growth rates through captive breeding of the species as well as on restoring the carrying capacity of its natural habitat.es_ES
dc.description.sponsorshipThis research was funded by the European Life Project n° LIFE 02 NAT-E-008614 to JAM and by the projects of the Ministerio de Ciencia e Innovación, REN 2001- 1514/GLO and CGL 2010–18216 to RZ.es_ES
dc.publisherBioMed Centrales_ES
dc.relation.isversionofPublisher's versiones_ES
dc.subjectMicrosatellite characterizationes_ES
dc.subjectGenetic diversityes_ES
dc.subjectMultiple paternityes_ES
dc.subjectHistorical demographyes_ES
dc.subjectCanary Islandses_ES
dc.titleIsland survivors: population genetic structure and demography of the critically endangered giant lizard of La Gomera, Gallotia bravoanaes_ES
dc.description.peerreviewedPeer reviewedes_ES
dc.contributor.funderEuropean Commission-
dc.contributor.funderMinisterio de Ciencia e Innovación (España)-
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