Claire’s mouse lemur 113
FIG. 1 (a) Madagascar, showing the location of Nosy Be, and (b) the survey area and line transects (Table 1). Transect IDs: top row T1–T4, middle row T5–T10, bottom row T11–T16. VOI, Vondron’Olona Ifotony.
adjustment provided the best fit to the data (χ2 = 2.06,df = 3, P=0.56; detection probability = 0.23; effective strip width = 7.05; Fig. 2). Extrapolating this density estimate across the forested area within the extent of occurrence of M. mamir- atra on Nosy Be yields a population of c. 4,700 individuals.
Discussion
We report the first population estimates for M. mamiratra, an Endangered and little-known mouse lemur of north-west Madagascar. We applied randomization and replication in our survey design and employed survey protocols that en- sured we met the key assumptions of distance sampling, al- lowing valid inference and extrapolation from our results. Our population data will inform future conservation status assessments and management decisions and provide a start- ing point for monitoring local population changes over time. More broadly, our study also helps to address the need for baseline population data for newly described mouse lemurs, and our use of standardized survey methods facilitates meaningful inter-site and interspecific compari- sons (Setash et al., 2017; Hending, 2021). Our density estimates for M. mamiratra (125.1 individ-
FIG. 2 Histogram showing the detection probability of Microcebus mamiratra as a function of perpendicular distance from the transect line on Nosy Be, north-west Madagascar (Fig. 1). The columns represent grouped detections of M. mamiratra and the curve represents the detection function. Data were right-truncated by 10%.
uals/km2) are intermediate compared to those of other mouse lemurs (see Setash et al., 2017, Hending, 2021 and Hending et al., 2022b for summaries of published Microcebus spp. population densities). Mouse lemur dens- ities are generally higher for western dry forest species and lower for eastern humid forest species, probably driven by
Oryx, 2025, 59(1), 109–118 © The Author(s), 2025. Published by Cambridge University Press on behalf of Fauna & Flora International doi:10.1017/S0030605324000772
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