Day Range

P. diadema at Mantadia have long daily path lengths (1629 m/day; Powzyk, 1997) while those of P. edwardsi at Ranomafana are shorter (670 m/day; Wright, 1987). P. diadema in continuous forest at Tsinjoarivo (Irwin, 2006) show intermediate values (987 m/day), as do P. tattersalli (461.7-1077 m/day; Meyers, 1993) and P. candidus (710 m/day; E. Patel, personal communication). These values are similar to those reported for western sifakas (Jolly, 1966; Richard, 1978) which is surprising given the marked difference in home range.

Daily path length is longest during the rainy season (approximately December to March) and shortest during the dry season (July-October) (Meyers, 1993;

Powzyk, 1997; Irwin, 2006). This suggests that it requires more ranging effort to procure an adequate supply of the fruits which are preferred in the rainy season. In contrast, the leaves and flowers used as a fallback in the dry season may be more uniformly available, or sifakas may be less selective about which plant species are used. Further research is necessary to adequately explain this pattern.

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