The effect of habitat fragmentation on the genetic structure of a top predator: loss of diversity and high differentiation among remnant populations of Atlantic Forest jaguars (Pan...

Authors
Haag, Taiana; Santos, Analisie S.; Sana, Dênis A.; Morato, Ronaldo G.; Cullen Jr., Laury; Crawshaw Jr., Peter G.; de Angelo, Carlos Daniel; Di Bitetti, Mario Santiago; Salzano, Francisco M.; Eizirik, Eduardo
Publication Year
2010
Language
English
Format
article
Status
Published version
Description
Habitat fragmentation may disrupt original patterns of gene flow and lead to drift‐induced differentiation among local population units. Top predators such as the jaguar may be particularly susceptible to this effect, given their low population densities, leading to small effective sizes in local fragments. On the other hand, the jaguar’s high dispersal capabilities and relatively long generation time might counteract this process, slowing the effect of drift on local populations over the time frame of decades or centuries. In this study, we have addressed this issue by investigating the genetic structure of jaguars in a recently fragmented Atlantic Forest region, aiming to test whether loss of diversity and differentiation among local populations are detectable, and whether they can be attributed to the recent effect of drift. We used 13 microsatellite loci to characterize the genetic diversity present in four remnant populations, and observed marked differentiation among them, with evidence of recent allelic loss in local areas. Although some migrant and admixed individuals were identified, our results indicate that recent large‐scale habitat removal and fragmentation among these areas has been sufficiently strong to promote differentiation induced by drift and loss of alleles at each site. Low estimated effective sizes supported the inference that genetic drift could have caused this effect within a short time frame. These results indicate that jaguars’ ability to effectively disperse across the human‐dominated landscapes that separate the fragments is currently very limited, and that each fragment contains a small, isolated population that is already suffering from the effects of genetic drift.
Fil: Haag, Taiana. Universidade Federal do Rio Grande do Sul; Brasil. Pontificia Universidade Católica do Rio Grande do Sul; Brasil
Fil: Santos, Analisie S.. Pontificia Universidade Católica do Rio Grande do Sul; Brasil
Fil: Sana, Dênis A.. Instituto Pró-Carnívoros; Brasil
Fil: Morato, Ronaldo G.. Centro Nacional de Pesquisa e Conservaçao de Mamíferos Carnívoros; Argentina. Instituto Pró-Carnívoros; Brasil
Fil: Cullen Jr., Laury. Instituto de Pesquisas Ecológicas; Brasil
Fil: Crawshaw Jr., Peter G.. Centro Nacional de Pesquisa e Conservaçao de Mamíferos Carnívoros; Argentina
Fil: de Angelo, Carlos Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Puerto Iguazú | Universidad Nacional de Misiones. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Puerto Iguazú; Argentina. Centro de Investigaciones del Bosque Atlántico; Argentina
Fil: Di Bitetti, Mario Santiago. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Puerto Iguazú | Universidad Nacional de Misiones. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Puerto Iguazú; Argentina. Centro de Investigaciones del Bosque Atlántico; Argentina
Fil: Salzano, Francisco M.. Universidade Federal do Rio Grande do Sul; Brasil
Fil: Eizirik, Eduardo. Pontificia Universidade Católica do Rio Grande do Sul; Brasil
Subject
PANTHERA ONCA
ATLANTIC FOREST
GENETIC DIVERSITY
POPULATION STRUCTURE
CARNIVORA
GENETIC DRIFT
NEOTROPICAL
Otras Ciencias Biológicas
Ciencias Biológicas
CIENCIAS NATURALES Y EXACTAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/56414