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Seasonal fruiting and seed dispersal by the brown lemur in a tropical dry forest, north-western Madagascar

Published online by Cambridge University Press:  14 February 2013

Hiroki Sato
Hiroki Sato*
Affiliation:
Center for African Area Studies, Kyoto University, Japan Current address: 46 Shimoadachi-cho, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan. Email: [email protected]
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Abstract:

Community-wide seasonal fruiting and seed dispersal by the common brown lemur (Eulemur fulvus fulvus) was investigated in a tropical dry forest, north-western Madagascar. The brown lemur is the sole disperser of large seeds > 10 mm in diameter. Considering the limited assemblage of dispersers, large-seeded plants should display distinctive fruiting patterns to acquire dispersers. To compare fruiting patterns and seed dispersal by the brown lemur between small-seeded and large-seeded plants, fruiting conditions for 432 trees on a transect, feeding activity over 1212 h of observation, and the composition of 1126 dung samples were recorded for 1 y. Seeds of a total of 52 species were identified through both observations and faecal analysis. As rainfall increased, larger numbers of species and individuals of small-seeded plants fruited. Among the 52 species, the brown lemur dispersed 29 and 13 species with small and large seeds, respectively, during the rainy season. High moisture levels probably favoured seed germination and seedling establishment in various species. During the dry season, although small-seeded species rarely fruited, a few large-seeded species, particularly Vitex beraviensis, formed a long-term fruiting peak and provided essential food resources for the brown lemur. Because seeds of these large-seeded plants were frequently dispersed by the brown lemur, dry-season fruiting seemed to be favourable to avoid competition for dispersers with other plant species.

Keywords

common brown lemurEulemur fulvus fulvusfaecal analysisfrugivorefruiting phenologyseasonalityseed dispersalseed size
Type
Research Article
Information
Journal of Tropical Ecology , Volume 29 , Issue 1 , January 2013 , pp. 61 - 69
Copyright
Copyright © Cambridge University Press 2013

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