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Heterozygosity-Fitness Correlations in a Continental Island Population of Thorn-Tailed Rayadito.
Botero-Delgadillo, Esteban; Quirici, Verónica; Vásquez, Rodrigo A; Kempenaers, Bart.
Afiliación
  • Botero-Delgadillo E; Department of Behavioural Ecology and Evolutionary Genetics, Max Plank Institute for Ornithology, Seewiesen, Germany.
  • Quirici V; Departamento de Ecología y Biodiversidad, Facultad de Ecología y Recursos Naturales, Universidad Andrés Bello, Santiago, Chile.
  • Vásquez RA; Centro de investigación para la sustentabilidad, Universidad Andrés Bello, Santiago, Chile.
  • Kempenaers B; Instituto de Ecología y Biodiversidad, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile.
J Hered ; 111(7): 628-639, 2020 12 31.
Article en En | MEDLINE | ID: mdl-33277658
Heterozygosity-fitness correlations (HFCs) have been used to monitor the effects of inbreeding in threatened populations. HFCs can also be useful to investigate the potential effects of inbreeding in isolated relict populations of long-term persistence and to better understand the role of inbreeding and outbreeding as drivers of changes in genetic diversity. We studied a continental island population of thorn-tailed rayadito (Aphrastura spinicauda) inhabiting the relict forest of Fray Jorge National Park, north-central Chile. This population has experienced a long-term, gradual process of isolation since the end of the Tertiary. Using 10 years of field data in combination with molecular techniques, we tested for HFCs to assess the importance of inbreeding depression. If inbreeding depression is important, we predict a positive relationship between individual heterozygosity and fitness-related traits. We genotyped 183 individuals at 12 polymorphic microsatellite loci and used 7 measures of reproductive success and estimates of apparent survival to calculate HFCs. We found weak to moderate statistical support (P-values between 0.05 and 0.01) for a linear effect of female multi-locus heterozygosity (MLH) on clutch size and nonlinear effects on laying date and fledging success. While more heterozygous females laid smaller clutches, nonlinear effects indicated that females with intermediate values of MLH started laying earlier and had higher fledging success. We found no evidence for effects of MLH on annual fecundity or on apparent survival. Our results along with the long-term demographic stability of the study population contradict the hypothesis that inbreeding depression occurs in this population.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Aves / Aptitud Genética / Genética de Población / Heterocigoto Tipo de estudio: Prognostic_studies Límite: Animals País/Región como asunto: America do sul / Chile Idioma: En Revista: J Hered Año: 2020 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos
Texto completo
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XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Aves / Aptitud Genética / Genética de Población / Heterocigoto Tipo de estudio: Prognostic_studies Límite: Animals País/Región como asunto: America do sul / Chile Idioma: En Revista: J Hered Año: 2020 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos