| disappearances of individuals from social groups have implications for understanding natal dispersal in monogamous owl monkeys (aotus azarai). | the socially monogamous owl monkeys (aotus spp.) live in small groups of two to five individuals. we used monthly demographic data collected from 16 social groups between 1997-2001 to estimate the age of disappearance from their natal groups and the timing of those disappearances in a population of owl monkeys (aotus azarai azarai) in formosa, argentina. we applied survival analysis techniques to 48 months of observations of 47 individuals to construct age-specific probabilities of disappearance ... | 2002 | 12210674 |
| cathemerality and lunar periodicity of activity rhythms in owl monkeys of the argentinian chaco. | although most south american owl monkeys are mainly nocturnal, aotus azarai azarai of the argentinean chaco regularly shows diurnal activity. in this study we examined the strong influence of moonlight on its diurnal and nocturnal activity, as well as the interaction of moonlight effects with other exogenous factors. we analyzed long-term automated activity recordings obtained with accelerometer collars from 7 owl monkeys during 2003 and 2004. our data show marked lunar periodic and seasonal mod ... | 2006 | 16415581 |
| food transfers to young and mates in wild owl monkeys (aotus azarai). | accounts of food sharing within natural populations of mammals have focused on transfers to offspring or transfers of food items that are difficult to obtain (such as meat). five groups of socially monogamous owl monkeys (aotus azarai azarai) in formosa, argentina were observed during 107 hr to determine the pattern of food sharing under natural conditions. there were a total of 42 social interactions involving food with food being transferred on eight occasions. adult males transferred food to ... | 2008 | 17849426 |
| mtdna diversity in azara's owl monkeys (aotus azarai azarai) of the argentinean chaco. | owl monkeys (aotus spp.) inhabit much of south america yet represent an enigmatic evolutionary branch among primates. while morphological, cytogenetic, and immunological evidence suggest that owl monkey populations have undergone isolation and diversification since their emergence in the new world, problems with adjacent species ranges, and sample provenance have complicated efforts to characterize genetic variation within the genus. as a result, the phylogeographic history of owl monkey species ... | 2011 | 21826638 |
| leishmania (viannia) dna detection by pcr-rflp and sequencing in free-ranging owl monkeys (aotus azarai azarai) from formosa, argentina. | american cutaneous leishmaniasis (acl) is caused by protozoan parasites of the leishmania genus, and transmitted by females of the phlebotominae family. the role of wild and domestic hosts in the cycle of leishmania is still unknown. acl is endemic in the province of formosa where nyssomyia neivai was the most abundant species in several captures and 31 cumulative acl human cases were reported between 2005 and 2011 in the province. the present report describes the detection, by pcr-rflp and conf ... | 2012 | 23305973 |
| can colour vision re-evolve? variation in the x-linked opsin locus of cathemeral azara's owl monkeys (aotus azarae azarae). | do evolutionary specializations lead to evolutionary constraint? this appears plausible, particularly when specialization leads to loss of complex adaptations. in the owl monkey lineage, nocturnality clearly arose from a diurnal ancestor. this behavioural shift was accompanied by morphological changes in the eye and orbit and complete loss of colour vision via missense mutations in the gene encoding the short-wave sensitive visual pigment (sws opsin). interestingly, at least one subspecies of ow ... | 2016 | 26913052 |
| seasonal variation of temporal niche in wild owl monkeys (aotus azarai azarai) of the argentinean chaco: a matter of masking? | among the more than 40 genera of anthropoid primates (monkeys, apes, and humans), only the south american owl monkeys, genus aotus, are nocturnal. however, the southernmostly distributed species, aotus azarai azarai, of the gran chaco may show considerable amounts of its 24-h activity during bright daylight. due to seasonal changes in the duration of photophase and climatic parameters in their subtropical habitat, the timing and pattern of their daily activity are expected to show significant se ... | 2012 | 22734571 |