PMID(sorted ascending)
number-related discrimination and summation by squirrel monkeys (saimiri sciureus sciureus and s. boliviensus boliviensus) on the basis of the number of sides of experiment 1, with the number of sides or angles of irregular polygons as cues, programmed training, and a 90% correct criterion (36 of 40), 2 squirrel monkeys' (saimiri sciureus sciureus and s. boliviensus boliviensus) best performances were to discriminate heptagons from octagons, a 3rd's best was hexagons from heptagons, and a 4th's best was pentagons from heptagons. in experiment 2, on most trials 2 polygons on one or both discriminanda had to be summed to determine which discrimination h ...19902225761
distribution of chromosomal polymorphisms in three subspecies of squirrel monkeys (genus saimiri).the presence of nucleolar organizer regions (nors) and c-band polymorphisms has been examined in three subspecies of squirrel monkeys, saimiri sciureus sciureus, s. boliviensis boliviensis, and s. boliviensis peruviensis. pericentric inversions in chromosomes 15 and 16 were also examined in the three groups. chromosome 15 was acrocentric in s. s. sciureus and submetacentric in s.b. boliviensis and s.b. peruviensis. chromosome 16 was acrocentric in s.s. sciureus and s.b. boliviensis while being s ...19902369837
elevation in plasma glucagon levels in response to stress in squirrel monkeys: comparisons of two subspecies (saimiri sciureus boliviensis and saimiri sciureus sciureus).bolivian (bo) and brazilian (br) squirrel monkeys (sms) were captured and restrained to determine patterns of glucagon and glucose response. in both subspecies, plasma glucagon and glucose levels rose rapidly in response to restraint procedures; glucagon levels in brsms and glucose levels in both subspecies returned to basal values in 15 minutes. the magnitude of the glucagon and glucose responses differed significantly between bosms and brsms.19883193450
a semi-natural habitat for housing small, nonhuman primates.a semi-natural habitat that was designed to house a social group of squirrel monkeys (saimiri sciureus sciureus) at goucher college, in maryland is described. the design could be readily adapted for use with other small primate species.19938138984
mycobacterium kansasii infection in squirrel monkeys (saimiri sciureus sciureus).this report documents asymptomatic infections of mycobacterium kansasii in four of five tuberculin positive squirrel monkeys (saimiri sciureus sciureus). the mycobacterial dna amplified by polymerase chain reaction (pcr) from a bronchial lymph node had no affinity for the species specific probes of m. tuberculosis, m. avium, and m. intracellulare, thus allowing the presumptive diagnosis of an atypical mycobacterial infection. infection by mycobacterium kansasii was confirmed by culture of bronch ...19958750498
[vaccination trials and immune response against plasmodium falciparum in saimiri monkeys].testing in experimental animal model is an essential phase in the development of a vaccine against as sexual blood stages of plasmodium falciparum. in the last ten years, the saimiri sciureus sciureus monkey has been widely used as a primate host of human malaria in immunological and parasitological experiments. the purpose of this report is to describe some breakthroughs that have been achieved using this model with particular emphasis on the essential role of immune phagocytosis by protective ...19989718561
determination of fetal biparietal diameter without the use of ultrasound in squirrel monkeys.this study evaluated manual caliper measurement of fetal bpd in saimiri through the abdomen of the dam (tbpd) for correlation with paired ultrasound measurements, prediction of delivery date, subspecies variation, prediction of pregnancy outcome, and correlation between postpartum bpd and tbpd. regression analysis revealed a close relationship between tbpd measurements and those obtained by ultrasound (p < 0.001). tbpd for saimiri boliviensis boliviensis increased from a mean of 14.8 +/- 0.3 mm ...19989926983
genetic analysis of the saimiri breeding colony of the pasteur institute (french guiana): development of a molecular typing method using a combination of nuclear and mitochondrial dna markers.saimiri (cebidae) groups a complex of species and subspecies, which present a large morphological plasticity. genetic analysis is complicated by the absence of consensus on classification criteria and the paucity of molecular tools available for the genus. as the squirrel monkey is widely used in biomedical research, breeding centers have been established, but the genetic make up and diversity of many of the existing colonies is unknown precluding a rationale breeding policy. to develop a geneti ...200314641788
effects of altered enclosure size and substrates on squirrel monkey (saimiri sciureus sciureus) behavior.we evaluated the effects of decreasing spatial density and changing substrate availability on activity, social spacing, and substrate use in a well-established, social group of 12 squirrel monkeys (saimiri sciureus sciureus). using instantaneous scan samples, we recorded the specific activity, distance to nearest neighbor, and substrate type for each animal at 10-min intervals during daylight hours and at three variations in spatial density and substrate availability. decreased spatial density w ...200516370574
tularemia as a cause of fever in a squirrel monkey.a 3-year-old female squirrel monkey (saimiri sciureus sciureus) was examined because of sudden onset of lethargy and fever.200616842053
uterine leiomyoma in a guyanese squirrel monkey (saimiri sciureus sciureus).an adult female squirrel monkey (saimiri sciureus) presented with a 3.0 x 2.5 cm firm mass palpable within the caudal abdomen. differentiation of the organs or structures involved with the mass could not be achieved with radiography or ultrasonography. exploratory laparotomy revealed a mass within the lumen of the uterus; the mass was removed by partial hysterectomy. on gross examination, the mass was a focally extensive, unencapsulated, firm, solitary tumor. histologic examination revealed that ...201020353700
comparison of rectal and tympanic core body temperature measurement in adult guyanese squirrel monkeys (saimiri sciureus sciureus).measuring core body temperature in a manner that is safe for animals and veterinary personnel is an important part of a physical examination. for nonhuman primates, this can involve increased restraint, additional stress, as well as the use of anesthetics and their deleterious effects on body temperature measurements. the purpose of this study was to compare two non-invasive methods of infrared tympanic thermometry to standard rectal thermometry in adult squirrel monkeys.201020946145
pleistocene diversification of living squirrel monkeys (saimiri spp.) inferred from complete mitochondrial genome order to enhance our understanding of the evolutionary history of squirrel monkeys (saimiri spp.), we newly sequenced and analyzed data from seven complete mitochondrial genomes representing six squirrel monkey taxa. while previous studies have lent insights into the taxonomy and phylogeny of the genus, phylogenetic relationships and divergence date estimates among major squirrel monkey clades remain unclear. using maximum likelihood and bayesian procedures, we inferred a highly resolved phyl ...201121443955
social organization of a stable natal group of captive guyanese squirrel monkeys (saimiri sciureus sciureus).socioecological models suggest competition for food, foraging efficiency, predation, infanticide risk, and the costs of dispersal regulate primate social structure and organization. wild populations of squirrel monkeys (saimiri spp.) appear to conform to the predictions of the predation/competition socioecological model (sterck et al. in behav ecol sociobiol 41:291-309, 1997) and the dispersal/foraging efficiency model (isbell in kinship and behavior in primates. oxford university, new york, pp ...201121826586
audio-vocal interactions during vocal communication in squirrel monkeys and their neurobiological implications.several strategies have evolved in the vertebrate lineage to facilitate signal transmission in vocal communication. here, i present a mechanism to facilitate signal transmission in a group of communicating common squirrel monkeys (saimiri sciureus sciureus). vocal onsets of a conspecific affect call initiation in all other members of the group in less than 100 ms. the probability of vocal onsets in a range of 100 ms after the beginning of a vocalization of another monkey was significantly decrea ...201323516002
morphology and mitochondrial phylogenetics reveal that the amazon river separates two eastern squirrel monkey species: saimiri sciureus and s. collinsi.saimiri has a complicated taxonomic history, and there is continuing disagreement about the number of valid taxa. despite these controversies, one point of consensus among morphologists has been that the eastern amazonian populations of squirrel monkeys form a single terminal taxon, saimiri sciureus sciureus (linnaeus, 1758). this group is distributed to both the north and south of the middle to lower amazon river and in the marajó archipelago. however, a recent molecular study by lavergne and c ...201525451802
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