| use of spatial, visual, and olfactory information during foraging in wild nocturnal and diurnal anthropoids: a field experiment comparing aotus, callicebus, and saguinus. | early in their evolution, the ancestors of anthropoid primates radiated from a nocturnal to a diurnal niche. foraging during the night differs from foraging during the day in terms of the availability of light and color cues, and in the movement of odor molecules through the canopy. in this study, we compared the ability of nocturnal and diurnal new world monkeys to use perceptual cues (i.e., the sight or smell of food) and spatial information (place predictability) in within-patch foraging deci ... | 2004 | 15027091 |
| comparative analysis of cd45 proteins in primate context: owl monkeys vs humans. | transmembrane protein tyrosine phosphatase (ptpase) cd45 has been implicated in activating, differentiating and the development of different immune system cells. it regulates t-or b-cell activation during receptor-specific recognition by dephosphorylating tyrosine residues in protein kinase substrates. aotus nancymaae, aotus nigriceps, and aotus vociferans cd45 nucleotide and deduced amino acid sequences are presented here, where we found 90-92% identity with the human counterpart in the nucleot ... | 2004 | 15245371 |
| reference strand conformational analysis (rsca) is a valuable tool in identifying mhc-drb sequences in three species of aotus monkeys. | the aotus monkey has been of great value in the pre-clinical study of malaria vaccine candidates. several components of this primate's immune system have been studied and they display great similarity to their human counterparts. cloning and sequencing studies have revealed extensive sequence polymorphisms in aotus mhc-drb with very high similarities to several human allelic lineages, grouping at least nine distinct mhc-drb lineages. as the efficacy of peptide vaccines in this animal model may b ... | 2006 | 16733718 |
| owl monkey mhc-drb exon 2 reveals high similarity with several hla-drb lineages. | one hundred and ten novel mhc-drb gene exon 2 nucleotide sequences were sequenced in 96 monkeys from three owl monkey species (67 from aotus nancymaae, 30 from aotus nigriceps and 13 from aotus vociferans). owl monkeys, like humans, have high mhc-drb allele polymorphism, revealing a striking similarity with several human allele lineages in the peptide binding region and presenting major convergence with drb lineages from several catarrhini (humans, apes and old world monkeys) rather than with ot ... | 2006 | 16791623 |
| naturally acquired visceral leishmaniasis in non-human primates in brazil. | visceral leishmaniasis (vl) is a chronic and often fatal protozoal disease that is endemic in belo horizonte (state of minas gerais, brazil). leishmania sp. is an intracellular obligatory parasite of macrophages that can naturally infect several mammalian species. non-human primates (nhp) have been used as experimental models for infection with leishmania of the donovani complex. the present report describes a case of visceral leishmaniasis in a black-fronted titi. among 41 primates kept in capt ... | 2010 | 20056328 |
| synteny of human chromosomes 14 and 15 in the platyrrhines (primates, platyrrhini). | in order to study the intra- and interspecific variability of the 14/15 association in platyrrhini, we analyzed 15 species from 13 genera, including species that had not been described yet. the dna libraries of human chromosomes 14 and 15 were hybridized to metaphases of alouatta guariba clamitans, a. caraya, a. sara, ateles paniscus chamek, lagothrix lagothricha, brachyteles arachnoides, saguinus midas midas, leontopithecus chrysomelas, callimico goeldii, callithrix sp., cebus apella, aotus nig ... | 2009 | 21637455 |
| natural plasmodium infection in monkeys in the state of rondônia (brazilian western amazon). | simian malaria is still an open question concerning the species of plasmodium parasites and species of new world monkeys susceptible to the parasites. in addition, the lingering question as to whether these animals are reservoirs for human malaria might become important especially in a scenario of eradication of the disease. to aid in the answers to these questions, monkeys were surveyed for malaria parasite natural infection in the amazonian state of rondônia, brazil, a state with intense envir ... | 2013 | 23731624 |
| granulomatous meningoencephalitis due to toxoplasma gondii in a black-headed night monkey (aotus nigriceps). | this report describes toxoplasmosis infection in a black-headed night monkey (aotus nigriceps) from the zoological park of the federal university of mato grosso, brazil. the animal was submitted alive to the veterinary hospital of the federal university of mato grosso presenting neurologic clinical signs. there were no improvements on the animal's clinical condition after treatment, so it was euthanized. at necropsy, the most significant gross lesions observed were hemorrhages diffusely scattere ... | 2011 | 22946380 |
| are rainforest owl monkeys cathemeral? diurnal activity of black-headed owl monkeys, aotus nigriceps, at manu biosphere reserve, peru. | members of the genus aotus are traditionally considered strictly nocturnal, however, in recent years cathemeral habits have been described in a single species of owl monkey, aotus azarai, which occur in the highly seasonal habitat of the argentinean chaco. this finding raises the question as to whether other species of aotus exhibit cathemeral activity in less seasonal habitats. in this study, we observed the diurnal activity of one group of a. nigriceps living in the manu biosphere reserve, per ... | 2014 | 24201468 |
| owl monkeys (aotus nigriceps and a. infulatus) follow routes instead of food-related cues during foraging in captivity. | foraging at night imposes different challenges from those faced during daylight, including the reliability of sensory cues. owl monkeys (aotus spp.) are ideal models among anthropoids to study the information used during foraging at low light levels because they are unique by having a nocturnal lifestyle. six aotus nigriceps and four a. infulatus individuals distributed into five enclosures were studied for testing their ability to rely on olfactory, visual, auditory, or spatial and quantitative ... | 2014 | 25517894 |
| primate abundance and habitat preferences on the lower urubamba and tambo rivers, central-eastern peruvian amazonia. | we report information on population density, group size, and habitat preferences of primates along the lower río urubamba and in the río urubamba-río tambo interfluvium, in central-eastern peruvian amazonia, an area that has been little explored with regard to its primate fauna. during 425 km of transect walks in october-november 2008 and april-may 2009 totally 174 groups of nine primate species were encountered, the most common being callicebus brunneus (45 groups), saguinus imperator (41 group ... | 2013 | 23661029 |