Cathemerality in the mongoose lemur, Eulemur mongoz
Version of Record online: 11 MAR 1999
Copyright © 1999 Wiley-Liss, Inc.
American Journal of Primatology
Volume 47, Issue 4, pages 279–298, 1999
How to Cite
Curtis, D. J., Zaramody, A. and Martin, R. D. (1999), Cathemerality in the mongoose lemur, Eulemur mongoz. Am. J. Primatol., 47: 279–298. doi: 10.1002/(SICI)1098-2345(1999)47:4<279::AID-AJP2>3.0.CO;2-U
- Issue online: 11 MAR 1999
- Version of Record online: 11 MAR 1999
- Manuscript Accepted: 1 APR 1998
- Manuscript Received: 30 JUL 1997
- A.H. Schultz Stiftung
- G. & A. Claraz-Schenkung
- Goethe Stiftung
- Schweizerische Akademie der Naturwissenschaften
- Primate Conservation Inc.
- EU-Project (AIR3-CT94-2107); Bundesamt für Bildung und Wissenschaft. Grant Number: 94.0156
- Eulemur mongoz;
- activity pattern;
- annual variation;
Results of a 10 month study of the mongoose lemur (Eulemur mongoz) at Anjamena are presented. The activity pattern is documented in detail for both wet and dry seasons based on observations conducted over the entire 24 h period. E. Mongoz was found to be cathemeral throughout the year but exhibited shifts towards more diurnal activity in the wet season and more nocturnal activity in the dry season. The cathemeral activity pattern in the mongoose lemur appears to be coordinated with sunrise, sunset, and day length and modulated by an inhibitory effect of low nocturnal light intensity in the forest during the wet season, resulting in mainly diurnal activity. Temperature and rainfall may also influence the activity pattern. Few advantages to food-related behavior appear to derive from this activity pattern, although resource accessibility may be enhanced by nocturnal behavior in the dry season, leading to reduction in interspecific competition. Cathemerality may also represent a behavioral thermoregulatory mechanism allowing the mongoose lemur to conserve energy by being active during the cool nights of the dry season. In addition, nocturnal behavior in the dry season probably allows avoidance of predation by raptors at the time of year when least protection is afforded by vegetation. Am. J. Primatol. 47:279–298, 1999. © 1999 Wiley-Liss, Inc.