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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Demographic decline and detection of genetic bottleneck in a population of Barn Owl Tyto alba in Hungary (2017)
Auteurs :	Robert Mátics, Auteur ; Gyula Hoffmann, Auteur ; Sándor Farkas, Auteur ; Deborah Dawson, Auteur ; Alain Frantz, Auteur ; Dániel Varga, Auteur ; Erika Mátics, Auteur ; Ákos Klein, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (158(3) 2017/07/01)
Article en page(s) :	811-821
Langues:	Anglais
Résumé :	The effects of population bottlenecks, from both the population and conservation genetics point of view, have attracted great interest. Heterozygosity and allelic diversity are basic components of the evolutionary potential of populations. Many endangered species go through bottlenecks from time to time. The consequences are important because in the resulting small populations the stochastic processes are more pronounced and, by strengthening each other, they can lead to extinction. Within the framework of the global climate change the question emerges of how the different species, primarily susceptible ones and those depending on protection measures, react to the climate extremities. It is well known that a large proportion of Barn Owl Tyto alba populations die following an unfavourable period. In the study reported here we genotyped 24 microsatellite loci of 58 unrelated Barn Owl individuals originating from a continuous population of three neighbouring Hungarian counties. We then performed the Wilcoxon sign-rank test, the L test and Monte Carlo simulation of the loss of alleles and heterozygosity. We also attempted to infer past population dynamics using two likelihood-based Bayesian methods. Although a 74% reduction of this population is well documented following the harsh winter of 2002/2003 and the sampling and resolution of the methods used are standard and considered to be commonly satisfactory, none of the tests showed pronounced signs of a recent bottleneck. These results are discussed in terms of the imminent and apparent drawbacks of the models and methods used, the roles of absolute numbers of survivors versus genotype percentages and the conservation biological viewpoint.
En ligne :	https://link.springer.com/article/10.1007/s10336-017-1433-z

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