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Ecologie et population de Rousettus madagascariensis G. Grandidier, 1928 (Pteropodidae)

Abstract : Forest habitat loss and associated changes in floristic composition are the major threats to the Malagasy terrestrial biodiversity. These processes are responsible for the decline of numerous species. However, for the vast majority of taxa, the mechanisms triggering these declines are poorly understood. Using the Malagasy rousette (Rousettus madagascariensis) as our model organism, we examine different genetic and ecological aspects of how this animal lives in natural habitats and copes with human modified landscapes of different physical and bioclimatic characteristics. This endemic species has a broad distribution, and appears to play a role in the regeneration of native forest. Through radio telemetry, faecal sample analysis, molecular genetics, and morphometric data, we were able to understand different aspects of the life-history traits and dispersal patterns of this taxon. Observations of wild animal placed in flight cages provided important inference on its feeding preferences between native and introduced plants, with economic value. Results indicate that R. madagascariensis i) uses both : the forest and human modified habitats while foraging; ii) it has a feeding preference for fruits of forest and pioneers species, as compared to plants of commercial importance; iii) it shows weak genetic structure, which is not associated with geographical distance; iv) and morphological variation that correlates with clines in altitude and latitude.
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Submitted on : Wednesday, May 23, 2012 - 4:16:50 PM
Last modification on : Friday, June 3, 2022 - 3:27:05 AM
Long-term archiving on: : Friday, November 30, 2012 - 12:06:09 PM


  • HAL Id : tel-00700678, version 1


Radosoa A. Andrianaivoarivelo. Ecologie et population de Rousettus madagascariensis G. Grandidier, 1928 (Pteropodidae). Biodiversité et Ecologie. Université Rennes 1, 2012. Français. ⟨NNT : ⟩. ⟨tel-00700678⟩



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