Isotopic signature in isolated south-western populations of European brown bear (Ursus arctos)

Abstract Stable isotope analysis of animal tissue samples is increasingly used to study the trophic ecology target species. The isotopic signatures respond type diet, but also environmental conditions their habitat. In case omnivorous, seasonal or opportunistic feeding species, interpretation values more complex, as it largely determined by food selection, either due individual choice because availability. We analysed C and N isotopes in brown bear ( Ursus arctos ) hair from four isolated populations south-western Europe (Cantabrian, Pyrenees, Central Apennines Alpine) accounting for geographical climatic differences among areas. found inter-population that cannot be attributed alone, indicating at least some bears relatively higher altitude experiencing precipitation (Pyrenees) show a greater consumption foods than those lower altitudes (Cantabrian Apennines). quantification niche space using Layman’s metrics identified significant similarities between Cantabrian Apennine markedly differ Pyrenean Alpine. Our provides baseline allow further comparisons spaces broad ranged omnivorous mammal, whose European distribution requires conservation attention especially southern populations.