Abstract In many mammal species, mothers are crucial for the survival and development of young offspring. primates, maternal investment may ensure immatures’ also foster their social integration in group, providing long-term fitness benefits. this study, we analysed a wild group (N = 49) male philopatric spider monkeys ( Ateles geoffroyi ). We assessed whether is biased toward sons (compared wi...

Parker, I. M. 1997. Pollinator limitation of Cytisus scoparius (Scotch broom), an invasive exotic shrub. Ecology 78: 1457–1470. Passos, F. C. and Kim, A. C. 1999. Nectar feeding on Mabea fistuifera Mart. (Euphorbiaceae) by black lion tamarin, Leontopithecus chrysopygus Mikan, 1983 (Callitrichidae), during the dry season in southeastern Brazil. Mammalia 63(4): 519–521. Pereira, M. E. and Fairban...

Cross-site comparison studies of behavioral variation can provide evidence for traditions in wild species once ecological and genetic factors are excluded as causes for cross-site differences. These studies ensure behavior variants are considered within the context of a species' ecology and evolutionary adaptations. We examined wide-scale geographic variation in the behavior of spider monkeys (...

Most platyrrhine monkeys have an X-linked tri-allelic polymorphism for medium and long wavelength (M/L) sensitive cone photopigments. These pigments' sensitivity maxima (lambdamax) range from 535 to 562 nm. All animals also have an autosomally coded short-wavelength-sensitive (S) cone pigment. In populations with three M/L alleles there are six different colour vision phenotypes. Heterozygous f...

Animal home ranges may vary little in their size and location in the short term but nevertheless show more variability in the long term. We evaluated the degree of site fidelity of two groups of spider monkeys (Ateles geoffroyi) over a 10- and 13-year period, respectively, in the northeastern Yucatan peninsula, Mexico. We used the Local Convex Hull method to estimate yearly home ranges and core...