| abo blood groups in the primate species of cebidae from the amazon region. | the abo blood groups were determined in blood and saliva collected from 40 aotus infulatus, 74 saimiri sciureus, and 96 cebus apella from the amazonian region along the tocantins river. saliva samples were tested for human abh antigens by a standard hemagglutination inhibition test. aotus infulatus showed monomorphism, exhibiting only the b blood group. saimiri sciureus exhibited the a (67) and ab (7) phenotypes. all four phenotypes have been found in c. apella: o (8), a (52), b (19) and ab (17) ... | 2002 | 12190854 |
| behavior patterns of southern bearded sakis (chiropotes satanas) in the fragmented landscape of eastern brazilian amazonia. | the endangered but poorly studied southern bearded saki, chiropotes satanas, faces extremes of habitat fragmentation throughout its geographic range in eastern amazonia. this article focuses on the behavior of the members of two groups--a large one (30-34 members) in continuous forest (home range=69 ha) and a much smaller one (7 members) on a 17-ha man-made island--at the tucuruí reservoir on the tocantins river. quantitative behavioral data were collected through scan and all-events sampling. b ... | 2009 | 18850586 |
| habitat use by chiropotes satanas utahicki and syntopic platyrrhines in eastern amazonia. | primates were surveyed at two sites in the xingu-tocantins interfluvium, in eastern amazonia, where at least eight platyrrhines are known to occur, including the endemic chiropotes satanas utahicki, vulnerable to extinction. only three other forms; alouatta belzebul belzebul, cebus apella apella, and saguinus midas niger; were recorded at both sites. data on habitat use (forest type and strata) were collected in standard line transect surveys and analyzed with relation to the availability of for ... | 2000 | 10711535 |
| diversity of nutcracking tool sites used by sapajus libidinosus in brazilian cerrado. | cracking nuts with tools is a behavior documented in a small number of populations of tufted capuchins, mainly in semi-arid caatinga and caatinga-cerrado transitional environments of northeastern brazil. only one of these populations inhabits the less arid cerrado in central brazil, where environments are composed of a heterogeneous mosaic of fields, savannas and forest formations. we conducted surveys in 10 of 20 localities where nutcracking by capuchins was reported by the local inhabitants in ... | 2015 | 25676549 |
| polyspecific associations between squirrel monkeys (saimiri sciureus) and other primates in eastern amazonia. | one of the most common types of polyspecific association observed in neotropical primate communities is that between squirrel monkeys (saimiri) and capuchins (cebus). the present study focused on association patterns in two saimiri sciureus groups in eastern brazilian amazonia, between march and october, 2009. the associations were analyzed in terms of the species involved, the degree of association, and niche breadth and overlap. the study involved two s. sciureus groups (b4 and gi) on the righ ... | 2011 | 21809365 |