Abstract :
[en] Background:
The European mink (Mustela lutreola, L. 1761) is a critically endangered mustelid, which inhabits
several main river drainages in Europe. Here, we assess the genetic variation of existing populations of this species,
including new sampling sites and additional molecular markers (newly developed microsatellite loci specific to
European mink) as compared to previous studies. Probabilistic analyses were used to examine genetic structure
within and between existing populations, and to infer phylogeographic processes and past demography.
Results:
According to both mitochondrial and nuclear microsatellite markers, Northeastern (Russia, Estonia and
Belarus) and Southeastern (Romania) European populations showed the highest intraspecific diversity. In contrast,
Western European (France and Spain) populations were the least polymorphic, featuring a unique mitochondrial
DNA haplotype. The high differentiation values detected between Eastern and Western European populations could
be the result of genetic drift in the latter due to population isolation and reduction. Genetic differences among
populations were further supported by Bayesian clustering and two main groups were confirmed (Eastern vs.
Western Europe) along with two contained subgroups at a more local scale (Northeastern vs. Southeastern Europe;
France vs. Spain).
Conclusions:
Genetic data and performed analyses support a historical scenario of stable European mink
populations, not affected by Quaternary climate oscillations in the Late Pleistocene, and posterior expansion events
following river connections in both North- and Southeastern European populations. This suggests an eastern refuge
during glacial maxima (as already proposed for boreal and continental species). In contrast, Western Europe was
colonised more recently following either natural expansions or putative human introductions. Low levels of genetic
diversity observed within each studied population suggest recent bottleneck events and stress the urgent need for
conservation measures to counteract the demographic decline experienced by the European mink.
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