...Patrick Tojotanjona Razanaparany; Hiroki Sato Cathemeral primates perform significant amounts of activity during the daylight and dark portions of the 24-h cycle. Most brown lemurs have been reported to be cathemeral. A previous study reported that brown lemurs in Ankarafantsika National Park (ANP...

..., Lorisidae, Daubentoniidae, Cheirogaleidae, Indriidae, and Lemuridae), to explore differences between nocturnal, diurnal and cathemeral species. As predicted by the variable importance of urine marking across species, the urine of nocturnal strepsirrhines contained the most VOCs and putative semiochemicals...

... ratio averages 0.271, while the night-time ratio averages 0.283. In 1978 I proposed the new word ‘cathemeral’, compounded from the Greek roots ĸατα (through) and &eta&;ogon;µΕρα (the day), to describe this unusual activity pattern, though for reasons described in this article the term...

... of abiotic factors in entraining the activity of cathemeral primates, focussing on results from a long-term study of Eulemur fulvus collaris (collared brown lemur) in south-eastern Malagasy littoral forest. Two groups of lemurs were followed for 60 whole-day and 59 whole-night observation periods over 14...

...Stefan Halle Cathemeral species are routinely active during the day, the night and at twilight. For the majority of species it is advantageous to specialize on the environmental conditions of a particular phase of the 24-hour day, so this rather uncommon type of activity must be a consequence...

...R.A. Hill As a behavioural strategy, cathemerality is thought to confer considerable advantages by allowing animals to extend activity flexibly into either the diurnal or nocturnal phase in response to the prevailing ecological conditions. Factors such as temperature, access to food sources...

...S.K. Bearder; K.A.I. Nekaris; D.J. Curtis This paper examines the importance of vision in the lives of nocturnal primates in comparison to diurnal and cathemeral species. Vision is the major sense in all primates and there is evidence that the eyesight of nocturnal species is more acute...

...Sybille Y. Traber; Alexandra E. Müller We studied the activity cycle of captive-born white-fronted lemurs (Eulemur fulvus albifrons) at Zurich Zoo with the aim to discuss current hypotheses on the evolution of cathemerality in lemurs. In contrast to their relatives in the wild, these lemurs were...

...Ian C. Colquhoun The removal, or absence, of predatory species could be a contributing proximate factor to the rise of primate cathemerality. But predators themselves can also be cathemeral, so cathemerality could well be an evolutionary stable strategy. From a comparative perspective, it appears...