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Accueil du site → Doctorat → Argentine → Ecología de la marmosa pálida, Thylamys pallidior (Marsupialia, Didelphidae), en el desierto de Monte Central

Universidad de Buenos Aires (2010)

Ecología de la marmosa pálida, Thylamys pallidior (Marsupialia, Didelphidae), en el desierto de Monte Central

Albanese, María Soledad

Titre : Ecología de la marmosa pálida, Thylamys pallidior (Marsupialia, Didelphidae), en el desierto de Monte Central

Ecology of the mouse opossum, Thylamys Pallidior (Marsupialia, didelphidae) in the central Monte Desert

Auteur : Albanese, María Soledad

Université de soutenance : Universidad de Buenos Aires

Grade : Doctor de la Universidad de Buenos Aires en el área de Ciencias Biológicas 2010

Résumé
The desert mouse opossum is a small marsupial inhabiting the aridlands of South America with the largest geographic distribution in the genus. Knowledge about its ecology is scarce, this being the first ecological study of a marsupial in the Monte. The objective of this thesis was to analyze the ecology of a mouse opossum population in an arid and heterogeneous environment. Three aspects of its ecology were studied : temporal population structure, habitat utilization and feeding habits. The study was carried out in three habitat types of the Ñacuñan Reserve, Mendoza, during the period 2005-2007. The capture effort was 27.600 trap-nights and 118 individuals were captured. Mouse opossums showed a strong seasonal abundance influenced by rainfall and probably limited by the availability of arthropods, their main food resource. Reproduction was coincident with the most favorable season, and showed some evidence of post-reproductive mortality and an annual replacement of generations, probably implying a semelparous strategy, very uncommon among vertebrates. T. pallidior showed scansorial habits and mostly used open and low complexity areas. The results support spatial, trophic and also temporal segregation mechanisms among species of this assemblage, and suggest an additional mechanism of resource partitioning : vertical spatial segregation. T. pallidior showed synchronicity with the environment in many aspects of its natural history. These strategies, coupled with physiological adaptations, allow the desert mouse opossum to cope with the heterogeneous and rigorous conditions that characterize the Monte desert.

Mots clés : DESIERTOS ; MONTE ; MARSUPIALES ; THYLAMYS PALLIDIOR ; USO DE HABITAT ; DIETA ; ESTRATEGIA REPRODUCTIVA ; SEMELPARIDAD ; DESERTS ; MONTE ; MARSUPIALS ; THYLAMYS PALLIDIOR ; HABITAT USE ; DIET ; REPRODUCTIVE STRATEGY ; SEMELPARITY

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