Abstract
The distribution and abundance of Danfoss’ mouse lemurs (Microcebus danfossi) and Grewcock’s sportive lemurs (Lepilemur grewcockorum), two regional endemics from northwestern Madagascar, were studied from May to December 2008 in the Sofia region between the rivers Sofia and Maevarano. The goal was to investigate the size and quality of forest fragments and to determine the presence and abundance of the recently described M. danfossi and L. grewcockorum. They are confined to this region and their conservation status has not yet been determined. A total of eleven sites were visited and systematic census observations were carried out in each of them. M. danfossi was present in ten of eleven sites and its abundance ranged from 4.5 to 8.5 individuals per kilometer. L. grewcockorum was present in only three of eleven sites and its abundance ranged from 0.8 to one individual per kilometre. Based on the results of this study M. danfossi should be listed as Vulnerable and L. grewcockorum as Endangered. Based on the abundance data, the size and the general condition of the fragments, the forests of Anjajavy, Ambarijeby and Bekofafa are most favorable for future protection, because they still contain the most intact nocturnal lemur communities. KEYWORDS: Mouse lemur, distribution, fragmentation, primates, sportive lemur.
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