Abstract
Estrous synchrony in seasonal breeders can in principle be based on and shaped by environmental, internal, and/or social cues. We analyzed the dynamics of estrous synchrony for the first time in a seasonal, nocturnal primate species, the gray mouse lemur (Microcebus murinus). We compared successive estrous cycles and different levels of spatial proximity over two reproductive seasons in a captive population in order to identify possible social influences on estrous synchrony. The females exhibited a marked estrous synchrony at the beginning of each reproductive season, but we found no indication of a process of socially induced synchronization among them. Females housed in the same cage/room were not more strongly synchronized than females housed in different cages/rooms. Moreover, cycles desynchronized from the first to the second estrus of the season. Estrous cycle length did not depend on age, parity, or social housing conditions, but instead mainly on the individuality of the lemurs. This individuality, shown for the first time in a nocturnal primate species, is likely to be based on an endogenous rhythm with a genetic basis. We discuss possible social advantages, e.g., communal rearing, and disadvantages, e.g., mate choice and female-female competition, of estrous synchrony for nocturnal primates living in a dispersed individualized social network, and propose that a moderate flexibility within the individual cycle lengths probably enables the females to compromise between the different socioecological pressures.
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Radespiel, U., Zimmermann, E. Dynamics of Estrous Synchrony in Captive Gray Mouse Lemurs (Microcebus murinus). International Journal of Primatology 22, 71–90 (2001). https://doi.org/10.1023/A:1026466015443
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DOI: https://doi.org/10.1023/A:1026466015443