Current genetic admixture between relictual populations might enhance the recovery of an elusive carnivore
Abstract
The present study investigated the natural recovery of the Eurasian otter (Lutra lutra) in France. The otter was widely distributed in France at the dawn of the 20th century, but then its range considerably shrank and became highly fragmented until the early 1970s, just before it was legally protected. However, for more than 25 years, the otter has been reconquering several parts of its original range and is now considered to be in expansion in France. We investigated the genetic differentiation and diversity of several populations from western and central France and northern Spain to gain insight into the recolonisation dynamics of this elusive species. The present study, based on the use of 14 microsatellite markers, revealed that otter populations seem to be split into five distinct groups. The distribution of samples in those five clusters was closely correlated with suspected refugia where the otter probably survived during the 20th century. Admixture was observed between genetic lineages, possibly enhancing their genetic diversity and thus increasing the recolonisation dynamics of these populations. This phenomenon resembles the genetic pattern noted in many invasive exotic species derived from multiple sources and introduction events. Finally, a demographic approach revealed the probable link between historical human pressure and otter population fragmentation patterns.
Keywords
Eurasian otter France Genetic diversity Lutra lutra Population genetic structure RecolonisationNotes
Acknowledgements
The authors thank all sample contributors from the different regions, and especially Sébastien Gautier (ONCFS), Ludovic Fleury and the following partners: Cistude-Nature, Charente-Nature, CEN Midi-Pyrénées, GREGE, ONCFS (a.o. Délégation Interrégionale Nord Ouest and Cellule Technique Sud Ouest), GMB, GMN, GMHL, LPO, Museum of Toulouse (MHNT), Fédération Aude Claire, Government of Navarra via the GANASA (Gestión Ambiental de Navarra), French ministry MTES and the DREAL’s, SFEPM and PNA Loutre. The authors thank the editor and three anonymous reviewers for their fruitful comments on the manuscript. We are also grateful to Prof. K. Van Doninck (University of Namur) for help in fundraising and logistic support.
Author contributions
CFC, DM, PF, NS, JRM and LMP designed research, performed analyses and wrote the paper. CFC, PF, DM, GC, XG, BL, FS, ES, JS and FUM contributed samples and helped for interpreting data and improving the manuscript.
Funding
LMP and JRM benefited from FRS-FNRS grants (“chargée de recherches” and “directeur de recherches”, respectively).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
Supplementary material
References
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