Dernière mise à jour le : 20 janvier 2015

Spatial heterogeneity in landscape structure influences dispersal and genetic structure: empirical evidence from a grasshopper in an agricultural landscape

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Dispersal may be strongly influenced by landscape and habitat characteristics that could either enhance or restrict movements of organisms. Therefore, spatial heterogeneity in landscape structure could influence gene flow and the spatial structure of populations. In the past decades, agricultural intensification has led to the reduction in grassland surfaces, their fragmentation and intensification. As these changes are not homogeneously distributed in landscapes, they have resulted in spatial heterogeneity with generally less intensified hedged farmland areas remaining alongside streams and rivers. In this study, we assessed spatial pattern of abundance and population genetic structure of a flightless grasshopper species, Pezotettix giornae, based on the surveys of 363 grasslands in a 430-km(2) agricultural landscape of western France. Data were analysed using geostatistics and landscape genetics based on microsatellites markers and computer simulations. Results suggested that small-scale intense dispersal allows this species to survive in intensive agricultural landscapes. A complex spatial genetic structure related to landscape and habitat characteristics was also detected. Two P.giornae genetic clusters bisected by a linear hedged farmland were inferred from clustering analyses. This linear hedged farmland was characterized by high hedgerow and grassland density as well as higher grassland temporal stability that were suspected to slow down dispersal. Computer simulations demonstrated that a linear-shaped landscape feature limiting dispersal could be detected as a barrier to gene flow and generate the observed genetic pattern. This study illustrates the relevance of using computer simulations to test hypotheses in landscape genetics studies.

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keyboard_arrow_right Titre : Spatial heterogeneity in landscape structure influences dispersal and genetic structure: empirical evidence from a grasshopper in an agricultural landscape
keyboard_arrow_right Type de documentation : Articles
keyboard_arrow_right Auteur(s) personne(s) : Badenhausser, Isabelle , Delaunay, Sabrina , Litrico, Isabelle , Leblois, Raphaël , Chapuis, Marie Pierre , Mallez, Sophie , Gauffre, Bertrand
keyboard_arrow_right Date de publication : 20 janvier 2015
keyboard_arrow_right Nombre de pages : pp. 1713-1728
keyboard_arrow_right Editeur(s) : Wiley
keyboard_arrow_right Tags thématiques : espèce capable de s'adapter, sauterelle, prairie, écosystème prairie, gestion du paysage, espèce
keyboard_arrow_right Mots-clés libres : clustering methods/computer simulations/dispersal/landscape genetics/microsatellites/pezotettix giornae/sauterelle
keyboard_arrow_right Langue : Anglais
keyboard_arrow_right N° d'édition (ISBN,DOI...) : 10.1111/mec.13152
keyboard_arrow_right Collection : Molecular Ecology
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