age at first reproduction in philopatric female muriquis ( brachyteles arachnoides hypoxanthus).female northern muriquis ( brachyteles arachnoides hypoxanthus or b. hypoxanthus) at the estação biológica de caratinga/rppn-fma, minas gerais, brazil typically disperse from their natal groups at an average age of 6.1+/-0.6 years (median =6.0 years, range =5.3-7.8 years, n =22), prior to the onset of puberty and sexual activity. immigrants do not conceive until at least their second mating season, and the minimum interval from immigration to first reproduction has been 2.0 years. age at first r ...200414505181
hormonal changes during the mating and conception seasons of wild northern muriquis (brachyteles arachnoides hypoxanthus).we investigated hormonal and behavioral changes in wild male and female northern muriquis (brachyteles arachnoides hypoxanthus) at the estação biológica de caratinga, minas gerais, brazil, during a 6-mo period that encompassed the onset of the 1998-1999 mating and conception seasons. individual females resumed mating with the resumption of ovarian cycling, which was not synchronized among them or related to their cortisol levels. females experienced two to seven cycles prior to conceiving, and t ...200314582130
vocal sequential exchanges and intragroup spacing in the northern muriqui brachyteles arachnoides hypoxanthus.sequential exchanges of vocalizations (staccatos and neighs) emitted by northern muriquis brachyteles arachnoides hypoxanthus were recorded at the biological station of caratinga, minas gerais state, brazil. staccatos and neighs containing larger proportion of short elements were preferentially produced during short-range exchanges; neighs, produced by a larger number of participants, were typical of long-range exchanges. staccatos emitted by animals feeding in a dispersed manner contained a lar ...200415258657
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