Habitat selection and diet of Western Capercaillie Tetrao urogallus in an atypical biogeographical region

摘要: Ecological features and conservation requirements of populations at the latitudinal limits a species’ geographical range frequently differ from those in other parts range. Identifying such differences is key to implementing effective strategies for threatened range-edge especially, context rapid global warming, lower-latitude edge. We studied habitat selection diet endangered Cantabrian Capercaillie Tetrao urogallus cantabricus recently discovered population southernmost edge sub-species’ This only Western Mediterranean biogeographical region. combined non-systematic surveys based on questionnaires, reports field sampling with data radiotracking assess selection. Diet was surveyed by micro-histological methods droppings collected new population, which inhabits Pyrenean Oak Quercus pyrenaica forests Scots Pine Pinus sylvestris plantations, two inhabiting Eurosiberian forests. preferred large (> 500 ha) medium-sized (100–500 forest fragments plantations. Forest smaller than 100 ha non-forested habitats were always avoided. differed markedly between populations. Bilberry Vaccinium myrtillus common most but scarce study area so rare population. Instead, Rockrose Halimium lasianthum described first time as major food resource consumed autumn winter. needles also heavily document strong preference moderately high consumption leaves, buds acorns this tree species throughout year. Habitat core Our results suggest wider environmental tolerance (phenotypic plasticity) previously recognized. advocate specific protection unique its habitat.