Southwestern Water Vole (Arvicola sapidus) lives in freshwater wetlands across Southwestern Europe. It feeds on aquatic plants roots. Its conservation status is Near Threatened.
Fascinating facts about the Southwestern Water Vole
- The vole's specialised habitats cover under 2 % of the surveyed area in southern Spain, leaving its populations naturally fragmented and vulnerable to local loss. It lives in small patches of vegetation on muddy banks beside water, where dense plant cover shields it from predators and drought. This reliance on narrow strips of wetland forces the species to occupy isolated islands of suitable ground across the landscape.
- Field research shows that individual voles move an average of about 700 metres each dispersal event, and males travel the same distances as females, indicating no sex bias. Despite being habitat specialists, they display a surprisingly generalist dispersal strategy, crossing seemingly unsuitable terrain to reach new patches of suitable wetland. This ability to cover several hundred metres helps maintain gene flow between the fragmented patches they occupy.
- Mitochondrial DNA work across Iberian and French populations uncovered a total of 85 distinct haplotypes, revealing a high level of genetic diversity within the species. Analyses further identified seven geographical genetic groups, which together account for roughly 44 % of the observed mitochondrial variation. These groups reflect historical fragmentation into sub-refugia during the Pleistocene, followed by later expansions.
- French populations of the southwestern water vole trace their ancestry to a relatively recent colonisation from Iberia about 62 000 years ago, predating the Last Glacial Maximum. Genetic analyses show that these northern groups have markedly lower diversity than their Iberian counterparts, a pattern typical of a founder effect from a limited number of migrants.
- Female southwestern water voles can become pregnant again almost as soon as they have given birth, with some individuals observed to be simultaneously pregnant and lactating. This rapid successive breeding contributes to the species' capacity for multiple litters each year, and some females may produce up to six litters over their lifetime. The high reproductive output is linked to body weight, as heavier females tend to have larger litters.
Sources
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At a glance
RangeSouthwestern Europe
HabitatFreshwater wetlands
DietAquatic plants roots
About the Southwestern Water Vole
In the lush, verdant banks of southwestern Europe's rivers, the Southwestern Water Vole navigates its domain with stealthy purpose, its tiny paws barely disturbing the water's edge as it forages for aquatic delights. With a twitch of its whiskers and a flick of its tail, this diminutive creature darts through the dense vegetation, its remarkable ability to thrive in a world of flowing water and shifting currents a testament to its enduring adaptability. As it slips beneath the surface, the vole's sleek, water-repellent fur glistens in the sunlight, a fleeting glimpse of a secret life lived in harmony with the river's rhythms.
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