Microhabitat use by the snow vole Chionomys nivalis in alpine environments reflects rock-dwelling preferences

作者: Juan José Luque-Larena , Pilar López , Joaquim Gosálbez

DOI: 10.1139/Z01-197

关键词:

摘要: Environmental conditions in mountainous regions have influenced the nature of some adaptations among small mammals and this may apply to strategies habitat use alpine biotopes. In present paper, microhabitat relation availability a population snow voles Chionomys nivalis Martins, 1842, nonhibernating microtine rodent that inhabits high-mountain environments exclusively, was studied. The results show C. did not microhabitats proportion availability, suggesting preference for certain charac - teristics. strongly used scree areas at all times, whereas available mixed shrubs (Juniperus communis Cytisus oromediterraneus) Scots pine (Pinus sylvestris) lower than expected. Factors other food, such as favourable microclimate or refuge from predators, might determine regular rocky microhabitats. also revealed differences structures related sex reproductive condi tion, different spatial tasks. Juveniles females central zones with junipers (J. communis) significantly more expected, repro- ductive males nonreproductive adults availability. Based on its unique morpholog ical, physiological, ecological characteristics, can be considered rock-dwelling specialist environments. Resume : Dans les montagneuses, environnementales ont influence la de certaines adapta- tions chez petits mammiferes et cela peut etre vrai des d'utilisation l'habitat dans biotopes alpins. On trouvera ici resultats d'une etude sur l'utilisation en fonction leur disponibilite une campagnols neiges un rongeur qui n'hiberne pas vit exclusivement habitats haute montagne. Les indiquent que n'utilise microha- bitats proportionnellement disponibilite, ce laisse supposer l'existence pour carac- teristiques l'habitat. frequentent beaucoup d'eboulis tout temps, alors qu'ils utilisent buissonneuses mixtes pins sylvestres moins prevu. Des facteurs autres nourriture, par exemple microclimat favorable ou protection contre predateurs, peuvent expliquer reguliere rocheux. I l y aussi dif- ferences rocheuses entre mâles femelles individus statuts reproducteurs diffe rents, suggere variables l'espace selon tâches reproductrices. juveniles reproductrices centrales eboulis d'eboulis-genevriers ( J. significativement plus prevu, adultes non disponibilite. caracteristiques morphologiques, physiologiques ecologiques particu lieres font espece specialiste milieux

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