- III — Méthodes D’inventaire et de Caractérisation de la Diversité Génétique en Milieu Naturel / Methods for Inventory and Characterization of Genetic Diversity in Natural Environment
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Setting conservation priorities: the case study of Carabus solieri (Col. Carabidae)
Choix des priorités de conservation: le cas de Carabus solieri (Col. Carabidae)
Genetics Selection Evolution volume 33, Article number: S141 (2001)
Abstract
C. solieri is an endangered species of Carabidae which is mostly associated with humid forests of the Alps, in Prance and in Liguria (Italy). We reanalysed morphological data published by Bonadona and compared the results to the molecular data set presented here. We used partial sequences of the mitochondrial cytochrome b gene and seven microsatellite loci to evaluate genetic diversity among and between populations and to propose a phylogeographic scenario. We recognised two basic entities, considered as subspecies, which probably colonised the present distribution range from two main refugia (in France and in Italy). There is no strict agreement between morphological and molecular data and we propose that hybridisation and introgres-sion between the two subspecies have led to the observed patterns of distribution of the characters. Our results show that sampled populations differ significantly in microsatellite allele frequencies even though some populations are < 15 km apart. Gene flow estimates between the 19 sampled populations indicated very restricted exchange. This is in agreement with the low vagility observed for most species of Carabus. Consequently, the Solier’s Carab is genetically structured on an extremely fine scale, and local population within a definite forest should be considered as management units. In the light of our data on C. solieri we discuss the usefulness, when hybridisation occurs, of the two main criteria usually quoted for identifying candidate populations for conservation management (uniqueness and diversity) and give some conservation recommendations for C. solieri.
Résumé
C. solieri est une espèce de Carabidae en danger d’extinction. Cette espèce est principalement associée aux forêts humides des Alpes frangaises et liguriennes (Italië). Nous réanalysons les données morphologiques publiées par Bonadona et comparons les résultats a ceux obtenus a partir des données géné-tiques présentées ici. Nous utilisons des séquences partielles du gêne du cytochrome b et sept loei microsatellites pour mesurer la diversité génétique au sein et entre les 19 populations échantillonnées et pour proposer un scénario phylogéographique. Nous reconnaissons deux entités de base, considérées comme sous-espèces, qui ont proba-blement colonisé l’actuelle aire de distribution a partir de deux refuges glaciaires (en France et en Italië). Il n’existe pas de congruence stricte entre les données morphologiques et moléculaires, et nous proposons l’hybridation et l’introgression entre les sous-espèces comme facteurs expliquant le patron de distribution des caractères observé. Nos résultats montrent que les populations étudiées différent significative-ment par leurs fréquences alléliques, même pour des populations séparées par moins de 15 kilomètres. Les estimations de flux génique entre les populations indiquent un faible niveau d’échange. Ceci est en accord avec la faible vagilité observée chez la plupart des espèces de Carabus. En conséquence le Carabe de Solier est génétique-ment structuré a une tres fine échelle, en conséquence toute population associée a un bloc forestier peut être considérée comme une unité de gestion. Nos résultats sur C. solieri, et en particulier la mise en évidence de l’introgression mitochondriale, nous amènent a discuter les deux principales methodes (originalité et diversité) utilisées couramment pour identifier les populations susceptibles d’être protégées. Enfin nous donnons quelques considérations générales sur les mesures de protection pouvant être prises.
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Rasplus, JY., Garnier, S., Meusnier, S. et al. Setting conservation priorities: the case study of Carabus solieri (Col. Carabidae). Genet Sel Evol 33 (Suppl 1), S141 (2001). https://doi.org/10.1186/BF03500878
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DOI: https://doi.org/10.1186/BF03500878