| marmoset species variation in the humoral antibody response: in vivo and in vitro studies. | a comparison of the in vivo and in vitro antibody response capabilities of two marmoset species, saguinus fuscicollis and saguinus oedipus oedipus, revealed the former to be superior in elaborating humoral antibody. in vivo challenges with escherichia coli lipopolysaccharide (lps) and salmonella typhi flagella consistently yielded higher antibody titres in s. fuscicollis; indeed, with lps antigen, multiple inoculations of s.o. oedipus marmosets led ultimately to a decrease in antibody formation, ... | 1978 | 100417 |
| chronic herpesvirus saimiri infection in an owl monkey. | an adult owl monkey (aotus tricirgatus) used for immunologic studies of herpesvirus saimiri (hvs) developed early, late, membrane, and neutralizing antibodies to hvs approximately 3 weeks after the beginning of the experiment. hvs was isolated by the cocultivation of peripheral blood for over 1 year. no clinical, gross, or histopathologic findings of malignancy were exhibited by the animal. the hvs isolate from the animal was indistinguishable biologically and serologically from the original hvs ... | 1976 | 186615 |
| isolation of a cytomegalovirus from salivary glands of white-lipped marmosets (saguinus fuscicollis). | minced salivary glands from seven white-lipped marmosets (saguinus fuscicollis and saguinus nigricollis) and one cotton-topped marmoset (saguinus oedipus) were cocultivated with marmoset cell cultures. a viral agent, designated ssg, was isolated from two saguinus fuscicollis. slowly progressing foci of rounded, vacuolated, refractile cells were first observed at 40-43 days incubation. electron microscopy revealed intranuclear herpesvirus nucleocapsids and intracytoplasmic and extracellular envel ... | 1979 | 220464 |
| quantification and excretion profiles of pteridines in primate urine. | biopterin, 6-hydroxymethyl-pterin, isoxanthopterin, neopterin and, pterin were quantified in stress-free collected spontaneous morning urine samples from callithrix jacchus, saguinus fuscicollis, saguinus labiatus, saimiri sciureus, presbytis entellus, cercopithecus albogularis, cercocebus torquatus, macaca fascicularis, hylobates concolor, pongo pygmaeus, and gorilla gorilla. in most species, biopterin was the most frequent urinary pteridine followed by neopterin. sex differences in biopterin a ... | 1992 | 1404333 |
| mr 40,000 human colonic epithelial protein expression in colonic mucosa and presence of circulating anti-mr 40,000 antibodies in cotton top tamarins with spontaneous colitis. | saguinus oedipus, callithrix jacchus, and saguinus fuscicollis are three species of new world monkeys which develop a form of colitis that is similar to human ulcerative colitis. only s oedipus, however, develop colon cancer. we examined intestinal tissues from these animals for the presence of an antigen cross reacting to the mr 40,000 human colonic epithelial protein that acts as an autoantigen in ulcerative colitis. using an anti-mr 40,000 monoclonal antibody (7e12h12, igm isotype), by an imm ... | 1992 | 1740277 |
| studies on the ascorbic acid metabolism of callitrichid monkeys by 14c isotope excretion technique. | recently it has been found that the two monkey species callithrix jacchus and saguinus fuscicollis, both belonging to the same new world monkey family callitrichidae and held in the same colony under identical conditions, had extremely different serum ascorbate levels. to examine the ascorbic acid metabolism the 14c-excretion of orally given 1-14c-ascorbic acid was studied under conditions of marginal and abundant vitamin c supply and under intentional stress. there were large differences in the ... | 1990 | 2251861 |
| connections of primary auditory cortex in the new world monkey, saguinus. | connections of primary auditory cortex (a-i) were investigated in the tamarin (saguinus fuscicollis), a new world monkey. in each case, a-i was defined by multiunit recordings, and best frequencies were determined for neurons at different recording sites. microlesions were placed to mark recording sites for correlation with cortical architecture. following mapping, separate injections of up to three different tracers (hrp-wga and fluorescent dyes) were placed into the representations of differen ... | 1989 | 2474584 |
| ascorbic acid in a new world monkey family: species difference and influence of stressors on ascorbic acid metabolism. | like other simian primates, the new world monkey callithrix jacchus, marmoset, and saguinus fuscicollis, tamarin, require ascorbic acid as an essential nutrient. for adult marmosets, a daily intake of 15 mg/kg metabolic body weight was found to be necessary to obtain a serum level above the kidney threshold. a survey of the serum ascorbic acid level of marmosets and tamarins in a breeding colony resulted in a vast divergence between the two species, indicating a higher ascorbic acid requirement ... | 1989 | 2497592 |
| effects of erythromycin and ciprofloxacin on chronic fecal excretion of campylobacter species in marmosets. | ciprofloxacin was compared with erythromycin for the eradication of campylobacter species that were chronically excreted in the stools of marmosets (saguinus labiatus labiatus, saguinus fuscicollis nigrifrons, and saguinus fuscicollis illigeri). stool cultures were negative within 48 h of the beginning of treatment with either agent. within 10 days after the end of therapy, however, campylobacter species were again isolated from the stools of six animals that had received erythromycin. during an ... | 1986 | 2940963 |
| transplantable primate tumors induced by rous sarcoma virus. i. induction of tumors transplantable into young marmosets. | the tumors induced in white-lipped marmosets (saguinus fuscicollis, s. nigricollis) by rous sarcoma virus (rsv) of chicken origin (rsv-sr) were not transplantable to allogeneic hosts. in contrast, rsv rescued from these tumors (rsv-m) induced sarcomas that were transplantable to young but not to adult marmosets. the tumors induced by rsv-m and the transplants rapidly enlarged, metastasized to various organs, and killed the recipients 29-59 days post inoculation. cell lines were readily establish ... | 1986 | 3016397 |
| experimental schistosoma mansoni infection in a small new world monkey, the saddle-back tamarin (saguinus fuscicollis). | twelve young adult captivity-born tamarin monkeys (saguinus fuscicollis) were each exposed to 150 cercariae of schistosoma mansoni (keb strain): 6 by the percutaneous (pc) and 6 by the subcutaneous (sc) route. the prepatent period, as determined by eggs in the feces, was 34-39 days for both groups. weekly quantitative fecal examinations revealed that although both groups actively passed eggs for as long as the duration of the experiment (18 months), the sc group excreted a significantly higher n ... | 1986 | 3085525 |
| body weights in mixed species troops of saguinus mystax mystax and saguinus fuscicollis nigrifrons in amazonian peru. | an investigation of body weights of members of mixed species troops of saguinus mystax mystax and saguinus fuscicollis nigrifrons was conducted at the rio blanco research station in northeastern peru. a total of 107 adult and subadult tamarin monkeys were trapped, measured, and released. data collected indicate that mean body weights for adult male and female moustached tamarins are 564 gm and 626 gm, respectively, whereas for adult saddle-back tamarins these values are 412 gm and 411 gm. subadu ... | 1986 | 3101505 |
| difference in serum ascorbate in two species of callithricidae. | in one species each of the subfamilies marmosets and tamarins of the new world monkey family callithricidae, serum levels of ascorbic acid were compared. although the feeding regimen had been the same for both species for several years, the average concentration of serum ascorbate in the tamarins saguinus fuscicollis (n = 21; 0.54 +/- 0.29 mg/100 ml) was only one-fifth that of the marmosets callithrix jacchus (n = 19; 2.56 +/- 1.07 mg). | 1987 | 3119508 |
| color vision polymorphism and its photopigment basis in a callitrichid monkey (saguinus fuscicollis). | the color vision of five saddle-backed tamarins (saguinus fuscicollis) was studied. behavioral tests of color discrimination and spectral sensitivity indicate that this species has a color vision polymorphism. individual monkeys have either dichromatic or trichromatic color vision. measurements of the spectral sensitivity of cones on this species were made on nine animals with the technique of electroretinogram (erg) flicker photometry. both the electrophysiological and the behavioral results su ... | 1987 | 3128920 |
| characterization of colonic cellular glycoconjugates in colitis and cancer-prone tamarins versus colitis and cancer-resistant primates. | differences in colonic secretory glycoconjugates (ie, mucin) between normal and ulcerative colitis-prone patients have been noted. similar differences may occur in a corresponding primate model, the cotton-top tamarin (ctt), saguinus oedipus, a new world monkey which suffers from spontaneous chronic colitis and colon cancer. lectin reagents were used to characterize and compare colonic cell surface, cytoplasmic, and secretory glycoconjugates of 9 clinically healthy cotton-top tamarins, 7 colitis ... | 1988 | 3132857 |
| immunoprecipitation as a tool for studying humoral immunity of natural and experimental hosts of herpesvirus saimiri. | herpesvirus saimiri strain 11 and attenuated h. saimiri strain 11 proteins synthesized during the lytic cycle of virus replication were used for immunoprecipitation with various sera from natural (saimiri sciureus) and experimental (saguinus nigricollis, saguinus fuscicollis, aotus trivirgatus, new zealand white rabbits) hosts. the analysis of the precipitates separated in sodium dodecyl sulfate:polyacrylamide gels revealed that in tumor-developing animals a specific set of viral polypeptides we ... | 1983 | 6303583 |
| detection of infectious hepatitis a virus in blood factor concentrates by experimental infection of the new world primate saguinus fuscicollis. | at present, the hepatitis a virus cannot be detected readily by cell culture techniques. however, the new world primate saguinus fuscicolis is particularly susceptible to this virus. this paper gives details of the in vivo detection of hepatitis a virus in s. fuscicolis, and the method is used to show that a blood factor viii preparation, suspected of being contaminated with hepatitis a, did not contain the virus. | 1995 | 7495965 |
| distribution of human endogenous retrovirus herv-k genomes in humans and different primates. | the distribution of the human endogenous retrovirus (herv)-k genome was investigated by southern-blot analyses using a herv-k-env dna probe. with the exception of one dna-sample, obtained from a chinese individual in whom an amplification of herv-k was detected, southern-blot analyses yielded identical hybridization patterns with dna from peripheral blood lymphocytes of 37 normal healthy blood donors, with dna from six tumor cell lines, or with 23 dna samples prepared from various carcinoma tiss ... | 1995 | 7635468 |
| cholesterol metabolism in new world primates: comparative studies in two tamarin species (saguinus oedipus and saguinus fuscicollis) and the squirrel monkey (saimiri sciureus). | 1. cholesterol metabolism has been characterized in three species of new world primates, the cotton-top tamarin, the saddle-back tamarin, and the squirrel monkey. 2. when fed a diet containing cholesterol, the three species exhibited differing responses of plasma cholesterol levels. 3. dietary cholesterol absorption was determined and plasma cholesterol die-away kinetics were analyzed in terms of a two-pool model. 4. the results of the analyses of cholesterol turnover are consistent with the obs ... | 1993 | 8299347 |
| age of epiphyseal closure in tamarins and marmosets. | estimates of the chronological age for animals of unknown age provide useful information for medical, demographic, and evolutionary studies. skeletal development, as indicated by epiphyseal closure, can be used to estimate an animal's chronological age or specify its stage of development. many studies of primate skeletal development have used animals of unknown age, with the order of epiphyseal closure providing a relative age for each animal. this study examines the age of epiphyseal closure at ... | 1997 | 9050370 |
| development of an enzyme-immunoassay (eia) for the measurement of follicle-stimulating-hormone (fsh) in callitrichid primates using a monoclonal antibody against the human-fsh-beta-subunit. | despite the importance of callitrichid primates in both biomedical and conservation research, practical and reliable immunoassays for the measurement of follicle-stimulating hormone (fsh) have not yet been described. a panel of monoclonal antibodies against specific peptide fragments within either the alpha or beta subunit of human fsh was evaluated for their ability to recognize fsh from callitrichid and other new world primates. one of these, monoclonal antibody 46.3h6.b7 raised against human ... | 1997 | 9057964 |
| adrenal cortical epithelial cysts in two saddleback tamarins (saguinus fuscicollis). | adrenal cysts of epithelial origin were found incidentally in the adrenal cortical tissues of two adult female saddleback tamarins. in one case, a small cluster of minor cysts was located at the cortico-medullary border. the cysts were filled with a periodic acid-schiff (pas)-positive, amorphous substance and lined by a cuboidal pas-negative epithelium, which resembled morphologically the ascending henle's loops of the kidney. these microcysts were thought to be mesonephric remnants. in the seco ... | 1998 | 9749363 |
| gongylonema macrogubernaculum in captive african squirrels (funisciurus substriatus and xerus erythropus) and lion-tailed macaques (macaca silenus). | necropsies performed between 1989 and 1995 on 15 african rope squirrels (funisciurus substriatus) and 20 african ground squirrels (xerus erythropus) from the baltimore zoo revealed 13 cases of gongylonemiasis. nematodes were embedded in the epithelium of the esophagus, pharynx, buccal mucosa, and tongue, resulting in varying degrees of esophagitis, pharyngitis, stomatitis, and glossitis, respectively. routine fecal examinations were negative, and the nematodes appeared to be unaffected by repeat ... | 1998 | 9809609 |
| gastrointestinal tumors observed in nonhuman primates at the german primate center. | twenty-six gastrointestinal tumors were observed in twenty-three nonhuman primates during routine necropsies at the german primate center, göttingen. the majority (15 cases) were colorectal mucoid adenocarcinomas in cotton-top tamarins (saguinus oedipus), which in two animals were associated with gastric adenomas. three cases of small intestinal mucoid adenocarcinomas occurred in common marmosets (callithrix jacchus). one colonic leiomyoma was observed in a dwarf galago (galagoides demidovii) an ... | 1998 | 10203013 |
| abundance, diversity, and patterns of distribution of primates on the tapiche river in amazonian peru. | this work presents data on the relative diversity, abundance, and distribution patterns of primates in a 20 km2 area of the tapiche river in the peruvian amazon. population data were collected while the study area was both inundated and dry (march to september 1997) using conventional line-transect census techniques. survey results reflected the presence of 11 primate species, but population parameters on only eight of the species will be presented, including saddleback tamarins (saguinus fuscic ... | 2001 | 11376449 |
| anterograde projections of the motorcortical tongue area in the saddle-back tamarin (saguinus fuscicollis). | in the new world monkey saguinus fuscicollis, the anterograde projections of the motorcortical tongue area were studied. three animals were analyzed. in two, biotin dextran amine was used as tracer; in the third, phaseolus vulgaris leucoagglutinin was used. identification of the tongue area was carried out by electrical brain stimulation. intracortical projections were found into the neighboring primary motor cortex, ventral premotor cortex, frontoopercular cortex, and primary and secondary soma ... | 2002 | 12373061 |
| the effect of colour vision status on the detection and selection of fruits by tamarins (saguinus spp.). | the evolution of trichromatic colour vision by the majority of anthropoid primates has been linked to the efficient detection and selection of food, particularly ripe fruits among leaves in dappled light. modelling of visual signals has shown that trichromats should be more efficient than dichromats at distinguishing both fruits from leaves and ripe from unripe fruits. this prediction is tested in a controlled captive setting using stimuli recreated from those actually encountered by wild tamari ... | 2003 | 12909697 |
| leaders of progressions in wild mixed-species troops of saddleback (saguinus fuscicollis) and mustached tamarins (s. mystax), with emphasis on color vision and sex. | leadership of travel progression is an important aspect of group living. it is widely believed that trichromacy evolved to facilitate the detection and selection of fruit in the dappled light of a forest. further, it has been proposed that in new world primate species, which typically contain a range of color vision phenotypes, at least one female in a group will be trichromatic (i.e., having three types of visual pigment, in contrast to the two types of pigment found in dichromatic individuals) ... | 2003 | 14669267 |
| niche expansion of a cryptic primate, callimico goeldii, while in mixed species troops. | we examined the effects of polyspecific associations on the behavior of one group of callimico goeldii in northwestern bolivia. data were collected for 1 year using focal animal sampling at 5-min intervals, for a total of 1,375 observation hours. in total, c. goeldii formed mixed species troops with five groups of saguinus fuscicollis and six groups of s. labiatus, and these were maintained during 81% of observations. c. goeldii rested more and traveled less while alone than while associated, bu ... | 2007 | 17486597 |
| long-term patterns of sleeping site use in wild saddleback (saguinus fuscicollis) and mustached tamarins (s. mystax): effects of foraging, thermoregulation, predation, and resource defense constraints. | sleeping sites are an important aspect of an animal's ecology given the length of time that they spend in them. the sleep ecology of wild saddleback and mustached tamarins is examined using a long-term data set covering three mixed-species troops and 1,300+ tamarin nights. seasonal changes in photoperiod accounted for a significant amount of variation in sleeping site entry and exit times. time of exit was more closely correlated with sunrise than time of entry was with sunset. both species ente ... | 2007 | 17632801 |
| marmosets (saguinus fuscicollis): are learning sets learned? | confronted with a novel object, a social group of marmoset monkeys investigated it. if they found food on it they returned to it readily the next day; whoever had led in eating usually did so again. if they did not find food, day 2 responsiveness decreased. these untrained performances were sufficient for one-trial visual discrimination learning. | 1982 | 17772318 |
| prey foraging of red titi monkeys, callicebus cupreus, in comparison to sympatric tamarins, saguinus mystax and saguinus fuscicollis. | we compared the prey capture strategies of red titi monkeys, callicebus cupreus, with those of sympatric mustached, saguinus mystax, and saddleback tamarins, saguinus fuscicollis, to examine whether animal prey is important in niche differentiation between these neotropical primates. we collected data on strata and substrate use during foraging, on prey searching and capturing, and on prey type of two c. cupreus groups and one group each of s. mystax and s. fuscicollis during a 5-month field stu ... | 2008 | 17787001 |
| trabecular bone structure in the mandibular condyles of gouging and nongouging platyrrhine primates. | the relationship between mandibular form and biomechanical function is a topic of significant interest to morphologists and paleontologists alike. several previous studies have examined the morphology of the mandible in gouging and nongouging primates as a means of understanding the anatomical correlates of this feeding behavior. the goal of the current study was to quantify the trabecular bone structure of the mandibular condyle of gouging and nongouging primates to assess the functional morpho ... | 2010 | 19918988 |
| the influence of human settlements on the parasite community in two species of peruvian tamarin. | although there is a growing recognition that the transfer of diseases between humans and non-human primates can be of great significance for conservation biology, there have been only a few studies focusing on parasites. in this study, saddleback (saguinus fuscicollis) and moustached tamarin (saguinus mystax) from the rainforest of the peruvian lowlands were used as models to determine helminth parasite associations between canopy-dwelling primate species and a nearby human settlement. the human ... | 2010 | 20025821 |
| functions of intermittent locomotion in mustached tamarins (saguinus mystax). | many animals interrupt their moving with brief pauses, which appear to serve several different functions. we examined the function of such intermittent locomotion in wild living mustached tamarins (saguinus mystax), small arboreal new world primates that form mixed-species groups with saddleback tamarins (saguinus fuscicollis). we investigated how different environmental and social factors affect pausing during locomotion and used these data to infer the function of this behavior. as measures of ... | 2010 | 20949115 |
| the social behavior of a marmoset (saguinus fuscicollis) group iii. spatial analysis of social structure. | the social behavior, and particularly the spacing patterns, of a marmoset (saguinus fuscicollis) group in a semi-naturalistic enclosure were observed for 14 months. data analysis revealed various changes as the group grew in size from four to eventually six members. weekly mean distances between the adult pair supported a spatial measure for estrus for the female. group dispersion, mean squared distance between all possible pairs, seemed to vary with the age composition of the group. factor anal ... | 2000 | 97193 |
| chromosome banding patterns and nucleolar organizing regions in three species of callithricidae (saguinus oedipus, saguinus fuscicollis, and callithrix jacchus). | chromosome complements of three species of callithricidae, saguinus oedipus, saguinus fuscicollis and callithrix jacchus, were analyzed by various banding techniques. morphometric data are presented. a diploid chromosome number of 2n = 46 is reconfirmed for all three species. several interesting interspecies chromosomal variations were demonstrated by g- and c-band patterns. active nucleolar organizing regions (nors) were revealed by the ag-as silver histochemical stain. | 2000 | 101664 |
| lack of effects of castration on scent marking, displays, and aggression in a south american primate (saguinus fuscicollis). | | 1998 | 108190 |
| features of female reproductive senescence in tamarins (saguinus spp.), a new world primate. | cyclical changes in concentration of plasma progesterone, urinary oestrone-conjugates and urinary luteinizing hormone (lh) were compared in young and older cotton-top tamarins (saguinus oedipus) and saddle-backed tamarins (s. fuscicollis). a group of six young adult tamarin females (4-5 years of age) was sampled over eight periods of 6-8 weeks and six older (14-20 years of age) females were sampled over thirteen periods. there was hormonal evidence of ovulation in all of the sampling periods for ... | 2005 | 1317448 |
| skin surface microflora of the saddle-back tamarin monkey,saguinus fuscicollis. | the resident skin surface microflora of 12 male and three femalesaguinus fuscicollis was studied. the suprapubic-circumgenital gland surface and the perirectal area were most heavily colonized (10(6)-10(8) colony forming units/cm(2)), but high numbers of organisms were also present on the abdomen, the sternal gland surface, and palms and plantar surfaces. bacteria were also recovered from hair clippings as well as from shaven skin surface, although at much lower densities (10(2)-10(4) colony for ... | 1989 | 24271804 |
| the structure of the vomeronasal organ and nasopalatine ducts in aotus trivirgatus and some other primate species. | a vomeronasal organ and patent nasopalatine ducts were found in adult specimens of aotus trivirgatus, arctocebus calabarensis, ateles geoffroyi and saguinus fuscicollis. the vomeronasal complex appeared to be functional except in ateles. however, the relative size of the organ in the platyrrhini is much reduced compared to that in prosimians. the possible role of the organ in mediating neuroendocrine processes in primates is discussed. | 1984 | 6425250 |
| finite element analysis of performance in the skulls of marmosets and tamarins. | reliance on plant exudates is a relatively rare dietary specialization among mammals. one well-studied example of closely related exudate feeders is the new world marmosets and tamarins. whereas marmosets actively gouge tree bark with their incisors to stimulate the flow of sap, tamarins are opportunistic exudate feeders that do not gouge bark. several studies of the dentaries and jaw adductors indicate that marmosets exhibit specializations for increased gape at the expense of bite force. few s ... | 2011 | 20572898 |
| islet hyperplasia in callitrichids. | five callitrichids (three common marmosets -callithrix jacchus -, a black tufted-eared marmoset -c. penicillata-, and a saddle-back tamarin -saguinus fuscicollis) were diagnosed with islet hyperplasia by histopathology and immunohistochemistry. all were privately-owned, unrelated callitrichids ranging from 2- to 4-year-old. relevant findings were anorexia (3/5), vomiting (2/5), ptyalism (1/5), polyuria/polydipsia (1/5), respiratory distress (1/5), hyperglycemia (2/3) and glycosuria (1/1); hyperg ... | 2002 | 12145399 |
| ultrasonographic and hormonal monitoring of pregnancy in the saddle back tamarin, saguinus fuscicollis. | ultrasonography was used in six saddle back tamarin females (saguinus fuscicollis) to diagnose pregnancy, monitor the patterns of uterine growth and embryonic/foetal development and examine the incidence loss of single embryos/foetuses. pregnancy was reliably diagnosed 17 days after conception, 10 days earlier than by plasma progesterone measurement. the patterns of uterine and embryonic/foetal growth paralleled those reported for the common marmoset, including a delay in embryonic development. ... | 1997 | 9438223 |
| genetic and environmental impacts on litter size and early infant survival in three species of callitrichids. | callitrichids are unusual among anthropoid primates in that they can deliver one to four offspring per litter in captivity. factors underlying intraspecific variation in litter size are unclear. data from the oak ridge associated universities (orau) marmoset research center provided an opportunity to investigate determinants of variation in (1) average litter size at birth and (2) average litter size surviving to 2 weeks of age in saguinus fuscicollis, s. oedipus, and callithrix jacchus. the obj ... | 2003 | 8742821 |
| measurement of faecal steroids for monitoring ovarian function in new world primates, callitrichidae. | measurement of immunoreactive progesterone, pregnanediol and oestradiol in faeces collected throughout ovarian cycles in three species of callitrichid primates is reported. faecal hormone concentrations were compared with plasma progesterone profiles during pgf2 alpha-controlled (n = 7) and natural (n = 8) cycles in callithrix jacchus and saguinus fuscicollis, respectively, and with urinary oestrone conjugates during five cycles in saguinus oedipus. unconjugated steroids, which predominated over ... | 1993 | 8283445 |
| effect of various biological factors on spontaneous marmoset and tamarin colitis. a retrospective histopathologic study. | histological sections of colons from 69 tamarins (46 saguinus oedipus and 23 saguinus fuscicollis illigeri) and 27 marmosets (callithrix jacchus) that died between 1979 and 1984 were examined for colitis. evaluated biological factors were species, age at death, source of animals, manner of death, presence of colon cancer, and time after importation. most normal colons were found in young animals (dead at less than 1 years of age). nearly all (approximately 96%) animals had colitis; 70-80% of mos ... | 1988 | 3134175 |
| palatability and digestibility of soya- and milk proteins in callithricidae. | 4 protein sources were tested for palatability, digestibility, influence on bodyweight and consistency of faeces in callithrix jacchus and saguinus fuscicollis. the protein sources were incorporated at crude protein levels of 12, 17 and 22% in a pelleted diet. a banana supplement was also fed which reduced the total protein content to 10.7, 14.7 and 18.3%. the test diets, fed for 3 weeks, were well accepted with the milk proteins being slightly preferred. consumption of the 12% protein pellets w ... | 1985 | 2993740 |
| x-ray-induced translocations in marmoset (callithrix jacchus) stem-cell spermatogonia. | the induction of reciprocal translocations in spermatogonial stem cells of marmosets (callithrix jacchus) was studied after irradiation with different doses of x-rays (50, 100 and 200 rad) via spermatocyte analysis many cell generations later. the obtained results show a dose-effect relationship with clear saturation effects at 200 rad. the recorded frequencies of translocations were much lower than those reported for closely related marmosets (saguinus fuscicollis and saguinus oepidus). possibl ... | 1984 | 6504061 |
| effects of fibre on digestibility and passage time in callithricidae. | the effects of fibre in a pelleted diet on food intake, digestibility of crude fibre, dry matter and energy, on passage time and consistency of faeces were studied in 2 species of callithricidae, callithrix jacchus and saguinus fuscicollis. coarse cellulose, microcellulose, wheat bran and shrimp meal (chitin = crude fibre) were tested in diets containing 2,4 and 6% total crude fibre, respectively. digestibility and passage time were determined by inclusion of 0.5% cr2o3 in the diet. both cellulo ... | 1984 | 6087023 |
| reproductive performance of three species of callitrichidae. | the reproductive performance of three species of callitrichidae housed under identical conditions, including relatively spacious caging and visual screening, was compared. the three species were callithrix jacchus, saguinus fuscicollis, and saguinus oedipus. callithrix jacchus was the most reliable breeder, with the lowest percentage of stillborn and the highest post-weaning survival. while the reproductive performance of s oedipus was better than that generally reported for other colonies, the ... | 1984 | 6431191 |
| organophosphate poisoning in marmosets. | due to faulty use of a chlorpyriphos-diazinon combination as a pesticide within a laboratory animal house, 19 marmosets of 2 species (saguinus fuscicollis and callithrix jacchus) of 98 at risk died from organophosphorous poisoning (19%) mortality). the clinical signs were those of cholinesterase inhibitors. the morphological lesions consisted predominantly of haemorrhages in several organs, particularly the cns, and of bone marrow necroses. | 1982 | 6176756 |
| reproduction of wild-caught and laboratory-born marmoset species used in biomedical research (saguinus sp, callithrix jacchus). | reproductive performances of wild-caught and laboratory-born marmosets maintained in a paired-cage system were summarized. wild-caught, white-lipped (wl) marmosets (saguinus fuscicollis, s nigricollis) averaged 2.6 live births per pair per yr compared with 1.6 for cotton-topped (ct) marmosets (s oedipus); s fuscicollis illigeri pairs were the best producers. of first and second generation laboratory-born animals, crossbred or hybrid wl pairs were the best producers; first generation pairs averag ... | 1975 | 813062 |
| re-description and assessment of the taxonomic status of saguinus fuscicollis cruzlimai hershkovitz, 1966 (primates, callitrichinae). | cruz lima's saddle-back tamarin saguinus fuscicollis cruzlimai hershkovitz, 1966, was described from a painting by eládio da cruz lima in his book mammals of amazonia, vol. 1, primates (1945). the painting was of four saddle-back tamarins from the upper rio purus, one of them distinct and the inspiration for hershkovitz to describe it as a new subspecies. its exact provenance was unknown, however, and the specimen was lost. surveys in the purus national forest in 2011 resulted in sightings of th ... | 2015 | 25688005 |
| chronic plasmodium brasilianum infections in wild peruvian tamarins. | there is an increased interest in potential zoonotic malarias. to date, plasmodium malariae that infects humans remains indistinguishable from plasmodium brasilianum, which is widespread among new world primates. distributed throughout tropical central and south america, the callitrichidae are small arboreal primates in which detection of natural plasmodium infection has been extremely rare. most prior screening efforts have been limited to small samples, the use of low-probability detection met ... | 2017 | 28902879 |
| vocal divergence and discrimination of long calls in tamarins: a comparison of allopatric populations of saguinus fuscicollis nigrifrons and s. f. lagonotus. | divergence in vocalizations can reduce gene flow by serving as a premating barrier during secondary contact between previously isolated populations. in primates, vocal divergence in long calls of separated populations has been documented, yet recognition of these differences by the respective populations has seldom been studied in the field. to investigate this issue, we studied populations of two subspecies of saddle-back tamarins (saguinus fuscicollis nigrifrons and s. f. lagonotus) that are s ... | 2015 | 25759142 |
| primary urinary bladder haemangiosarcoma in a captive saddleback tamarin (saguinus fuscicollis). | a captive adult male saddleback tamarin, saguinus fuscicollis, was lethargic, unresponsive to its surrounding and died before medical care. | 2014 | 24784233 |
| navigating in small-scale space: the role of landmarks and resource monitoring in understanding saddleback tamarin travel. | recent studies of spatial memory in wild nonhuman primates indicate that foragers may rely on a combination of navigational strategies to locate nearby and distant feeding sites. when traveling in large-scale space, tamarins are reported to encode spatial information in the form of a route-based map. however, little is known concerning how wild tamarins navigate in small-scale space (between feeding sites located at a distance of ≤60 m). therefore, we collected data on range use, diet, and the a ... | 2014 | 24038234 |
| territorial polemics: a response to roberts. | our recent paper lledo-ferrer et al. (international journal of primatology 32: 974-991, 2011) questioned the classic view of territoriality and chemical communication in wild callitrichids, saddleback tamarins (saguinus fuscicollis). we suggested that rather than defending a territory or resources, chemical communication was more likely to be a way of exchanging reproductive information between groups. roberts (international journal of primatology 33, 2012). challenged this interpretation, consi ... | 2012 | 22865945 |
| dna fingerprinting validates seed dispersal curves from observational studies in the neotropical legume parkia. | determining the distances over which seeds are dispersed is a crucial component for examining spatial patterns of seed dispersal and their consequences for plant reproductive success and population structure. however, following the fate of individual seeds after removal from the source tree till deposition at a distant place is generally extremely difficult. here we provide a comparison of observationally and genetically determined seed dispersal distances and dispersal curves in a neotropical a ... | 2012 | 22514748 |
| the equivocal relationship between territoriality and scent marking in wild saddleback tamarins (saguinus fuscicollis). | researchers have often assumed that scent marking serves a territorial function in callitrichines, although some controversy exists. to fulfill such a function, scent marks should 1) prevent intrusions, 2) ensure access to feeding resources, 3) enable avoidance of intergroup encounters, or 4) play an important role in the aggressive encounters between groups. we studied 13 saddleback tamarins (saguinus fuscicollis) belonging to 3 free-ranging groups, which formed mixed-species troops with mousta ... | 2011 | 21892237 |
| effect of resting patterns of tamarins (saguinus fuscicollis and saguinus mystax) on the spatial distribution of seeds and seedling recruitment. | the spatial distributions of dispersed seeds have important evolutionary consequences for plants. repeated defecations in sites frequently used by seed dispersers can result in high seed concentrations. we observed the resting behavior of a mixed-species group of tamarins in peru and recorded the occurrence of seed dispersal (over 8 mo) and seed fate (over 11-22 mo) to determine whether the location and use of resting sites influenced the spatial distribution of dispersed seeds and seedlings. th ... | 2011 | 21423318 |
| can overmarking be considered as a means of chemical mate guarding in a wild callitrichid? | mate guarding is a male strategy to monopolize matings and thus to ensure paternity. since in callitrichids female reproductive status is advertised by scent marks, one may expect mate guarding by chemical means. we addressed this question during an episode of consortship observed in a polyandrous trio of wild saddleback tamarins (saguinus fuscicollis). during consortship, the consort male was the only one to allomark the female. scent marking frequency decreased for all individuals, although th ... | 2010 | 20975281 |
| vigilance in a cooperatively breeding primate. | collective vigilance is considered a major advantage of group living in animals. we investigated vigilance behavior in wild mustached tamarins (saguinus mystax), small, arboreal, cooperatively breeding new world primates that form stable mixed-species groups with saddleback tamarins (saguinus fuscicollis). we aimed 1) to investigate whether vigilance patterns change according to individual activity and 2) to examine whether there is a social component of vigilance in their cooperative and nonagg ... | 2010 | 20174438 |
| vigilance of mustached tamarins in single-species and mixed-species groups-the influence of group composition. | species that participate in mixed-species groups (msg) may have complementary roles in antipredator strategies. we studied vigilance in mustached tamarins (saguinus mystax), small arboreal primates that form stable mixed-species groups with saddleback tamarins (saguinus fuscicollis), in order to examine how the direction of vigilance changes with different species group compositions and whether the division of labor between the two species can be confirmed. we did so by comparing quantitative an ... | 2010 | 20119489 |
| spontaneous inclusion body hepatitis in young tamarins: i. morphological study. | over a period of 4 years approximately 60% of the new born and juvenile animals in a breeding colony of tamarins (saguinus fuscicollis) died a sudden death. histological examination at necropsy revealed interstitial hepatitis in 22 of the 30 young animals of the present study. the hepatocytes contained intranuclear inclusion bodies in 12 of the 22 cases. upon ultrastructural examination, tubulovesicular structures and amorphous material were found in the nuclei. the endoplasmic reticulum had pro ... | 1992 | 1518281 |
| patterns of positional behavior in mixed-species troops of callimico goeldii, saguinus labiatus, and saguinus fuscicollis in northwestern brazil. | we present the results of a 4-month field investigation of positional behavior, vertical ranging, and species differences in limb proportions and body mass in a mixed-species troop of saguinus fuscicollis, saguinus labiatus, and callimico goeldii in northwestern brazil. despite certain similarities in overall positional repertoire, patterns of positional behavior varied significantly between species. travel in callimico occurred principally in the lowest levels of the canopy, and was characteriz ... | 2001 | 11329165 |
| the chromosomes of saguinus fuscicollis illigrei (pucheran, 1845) and aotus trivirgatus (humboldt, 1811). | | 1969 | 4979357 |
| evaluation of serum parameters relevant to vitamin d status in tamarins. | serum levels of 25(oh)d, alkaline phosphatase (ap), and parathormone (pth) were evaluated to investigate the vitamin d requirement of saguinus fuscicollis. diets with various vitamin d content were fed 4 weeks and longer. the values of 25(oh)d (30-300 nmol/l), ap (less than 300 u/l), and pth (less than or equal to 1,000 equl/l) considered as normal were obtained with 2,000 iu d3/kg diet, or 33 iu/animal/day, which we regard as the level required. animals depleted of vitamin d for 215 days develo ... | 2011 | 3039143 |
| effects of support size and orientation on symmetric gaits in free-ranging tamarins of amazonian peru: implications for the functional significance of primate gait sequence patterns. | the adoption of a specific gait sequence pattern during symmetrical locomotion has been proposed to have been a key advantage for the exploitation of the fine branch niche in early primates. diverse aspects of primate locomotion have been extensively studied in technically equipped laboratory settings, but evolutionary conclusions derived from these investigations have rarely been verified in wild primates. bridging the gap from the lab to the field, we conducted an actual performance determinat ... | 2010 | 20060568 |
| the win-stay rule in foraging decisions by free-ranging titi monkeys (callicebus cupreus cupreus) and tamarins (saguinus imperator imperator and saguinus fuscicollis weddelli). | rainforest primates need to apply distinct foraging rules for efficiently using the spatial knowledge of the distribution of resources showing different temporal patterns of renewal. a win-stay rule is very important for exploiting abundant, long-lasting resources. here, the author tests the use of this rule in wild groups of emperor tamarins (saguinus imperator imperator), saddle-back tamarins (saguinus fuscicollis weddelli), and titi monkeys (callicebus cupreus cupreus) during a series of fora ... | 2005 | 16131263 |
| ontogenetic bases of canine dimorphism in anthropoid primates. | this study tests hypotheses regarding the ontogeny of canine tooth size dimorphism in five anthropoid primate species (saguinus fuscicollis, macaca mulatta, cercocebus atys, papio hamadryas, and mandrillus sphinx). canine measurements and chronological age data are analyzed to determine if bimaturism, a sex difference in the age at which eruption ceases, accounts for canine tooth sexual dimorphism. canine height measurements are evaluated through a variety of regression techniques. results show ... | 2005 | 15584072 |
| forest use and activity patterns of callimico goeldii in comparison to two sympatric tamarins, saguinus fuscicollis and saguinus labiatus. | callimico goeldii, saguinus fuscicollis, and s. labiatus are sympatric in northern bolivia and differ from each other in patterns of spatial and structural use of their environment. c. goeldii has a home range five times larger than that of mixed-species troops of s. fuscicollis and s. labiatus. the larger overlapping home range of c. goeldii allows it to move among saguinus troops, giving it access to a wide range of different microhabitats. all three species use the most common microhabitat in ... | 2004 | 15160367 |
| field observations of the golden-mantled tamarin, saguinus tripartitus, on the río curaray, peruvian amazonia. | during a primatological survey on the río curaray in north-eastern peruvian amazonia, observations on the ecology and behaviour of the golden-mantled tamarin, saguinus tripartitus, were made. two groups consisting of 6 and 9 individuals were observed. the diet of one group that was observed in some detail consisted of fruit, insects (tettigoniid orthopterans) and gums. patterns of height use were very similar to those observed in saddle-back tamarins, saguinus fuscicollis. this similarity and th ... | 2000 | 11155027 |
| infanticide in a group of wild saddle-back tamarins, saguinus fuscicollis. | an infanticide was observed in a group of wild saddle-back tamarins, saguinus fuscicollis. the newborn singleton was killed by its mother after it had fallen from the carrier several times. this infanticide may represent a case of parental manipulation: the mother terminated investment in an offspring that probably had a low chance of survival. also, stress associated with the simultaneous pregnancy of another adult female in the group may have played a role. | 2000 | 10676711 |
| hand specialization, sympatry, and mixed-species associations in callitrichines. | hand morphology in callitrichines (i.e., tamarins, marmosets, and goeldi's monkey) is correlated with positional and foraging behaviors. this study examines hand shape in callitrichines using an allometric approach. it addresses a series of questions relating hand anatomy, insect foraging behavior, and resource partitioning in callitrichines. the main questions are: 1. do the hands of leontopithecus differ in shape from all other callitrichine taxa allowing it to perform highly manipulative prey ... | 1999 | 10208791 |
| anti-predation benefits in a mixed-species group of amazonian tamarins. | because of their small body size, tamarins are potentially vulnerable to a wide range of predator species. this paper examines the general patterns of predator avoidance of the avila-pires saddle-back tamarin (saguinus fuscicollis avilapiresi) and the red-cap moustached tamarin (saguinus mystax pileatus) in the upper urucu river, amazonas, brazil. one highly stable mixed-species group of these species suffered an average of 1 attack by carnivorous raptors every 8.8 days of activity. although non ... | 1993 | 8188122 |
| associations of tamarins (saguinus mystax and saguinus fuscicollis) and double-toothed kites (harpagus bidentatus) in peruvian amazonia. | | 1992 | 1473781 |
| copulatory behavior of adult tamarins (saguinus fuscicollis) castrated as neonates or juveniles: effect of testosterone treatment. | the sexual interactions of saguinus fuscicollis males castrated as neonates, at 37 days of age, or prepubertally with adult intact females were studied. prepubertally castrated males were observed while receiving testosterone, and while being treated with saline. males castrated neonatally or at 37 days of age were observed while receiving testosterone. neonatal castrates had previously been studied without hormone treatment and therefore no control condition was included for these animals. prep ... | 1990 | 2286363 |
| trichobezoars in two saddleback tamarins (saguinus fuscicollis). | two captive-born saddleback tamarins (saguinus fuscicollis) died unexpectedly in the primate colony at the peruvian primatological project. at necropsy, a firm, mobile, oblong, obscure mass was discovered in the stomach of each. they were removed and determined to be trichobezoars. | 1990 | 2110980 |
| c-fos expression during vocal mobbing in the new world monkey saguinus fuscicollis. | in order to find brain areas involved in the vocal expression of emotion, we compared c-fos expression in three groups of saddle-back tamarins (saguinus fuscicollis). one group, consisting of three animals, was made to utter more than 800 mobbing calls by electrical stimulation of the periaqueductal grey of the midbrain (pag). a second group, consisting of two animals, was stimulated in the pag with the same intensity and for the same duration as the first group but at sites that did not produce ... | 1996 | 8713445 |
| genetic basis of polymorphism in the color vision of platyrrhine monkeys. | it was earlier proposed that the polymorphism of color vision observed in some neotropical monkeys could be accounted for by assuming that these animals have only a single photopigment gene locus on the x-chromosome. three kinds of evidence have been added to existing data sets in an effort to evaluate the adequacy of the single locus model: (1) photopigment complements of squirrel monkeys (saimiri sciureus) have been determined using electroretinogram flicker photometry; (2) photopigment pedigr ... | 1993 | 8447099 |
| the vomeronasal organ of the new world monkey saguinus fuscicollis (callitrichidae). a light and transmission electron microscopic study. | the vomeronasal organ (vno) of the new world monkey saguinus fuscicollis (callitrichidae) is located at the base of the most distal portion of the nasal septum opening into the nasal portion of the ductus nasopalatinus which also communicates with the oral cavity. the lumen of the vno is limited medially and laterally by a neuroepithelium which is devoid of intraepithelially located blood vessels and composed of receptor, supporting and basal cells. ultrastructural analysis of the vno of saguinu ... | 1994 | 8059964 |
| effects of prepubertal ovariectomy on the development of scent glands, scent marking, and aggressive behaviors of female tamarin monkeys (saguinus fuscicollis). | | 1982 | 6890940 |
| polyspecific association between saguinus fuscicollis, saguinus labiatus, callimico goeldii and other primates in north-western bolivia. | during a 5-month field study on the primates of northern bolivia, it was found that two callitrichid species, saguinus fuscicollis and saguinus labiatus, formed apparently stable mixed troops, sharing a common home range, and associating for approximately 50% of their day. the groups joined together each morning and sometimes stayed together for several hours, up until mid-afternoon. in some localities, a callimico goeldii group was also present, and they shared the same home range and associate ... | 1982 | 6813207 |
| antibody formation by one or both lymphoid populations present in chimeric marmosets. | development of an isoimmune serum capable of identifying a specific leukocyte antigen in the marmoset, saguinus fuscicollis illigeri, permitted detection of lymphoid cell chimerism in this species by the cytotoxic test. this reagent was then used to identify the cell population in the chimera responsible for antibody production against a test antigen, sheep red blood cells. primary in vitro antibody formation as measured by plaque-forming cells with blood leukocytes or splenic lymphocytes of six ... | 1983 | 6352057 |
| histochemistry of mucosubstances in brunner's-gland cells and duodenal goblet cells of two new world monkey species (saimiri sciureus and saguinus fuscicollis). | duodenal goblet cells and brunner's-gland cells obtained from two species of new world monkeys (saimiri sciureus and saguinus fuscicollis) were studied using conventional histochemical methods and by applying a panel of 17 labelled lectins. the secretions of both goblet and brunner's-gland cells were found to contain neutral mucosubstances, while those of goblet cells also exhibit acid and sulphated carbohydrate components. lectin binding studies allowed a more detailed analysis of the mucus gly ... | 1988 | 3130342 |
| rates of epithelial cell proliferation in the oral mucosa and skin of the tamarin monkey (saguinus fuscicollis). | epithelial cell proliferation was determined in skin and various regions of the oral cavity of the tamarin monkey and was expressed by means of two mitotic indices: the number of metaphases per mm of epithelial surface, and the number of metaphases per mm basement membrane. a significant correlation was obtained between the rank ordering of the different regions according to each index. generally, the non-keratinized tissues of the oral cavity had mitotic rates higher than those of the keratiniz ... | 1986 | 2444635 |
| [feeding activity, spontaneous activity and body core temperature of saddle-back tamarins (saguinus fuscicollis)]. | eating behaviour and spontaneous activity (videometry) as well as deep body temperature (radiotelemetry) of 3 adult saddle back tamarins (saguinus fuscicollis) were investigated (singly housed, environmental temperature 28 degrees c, relative air humidity 60%, light 6:00-18:00 h, drinking-water and pelleted colony diet ad lib.). the experimental animals (1 female, 2 males; 3-8 years old), born in captivity, showed only some slight individual differences within their inborn species pattern, with ... | 1991 | 1905860 |
| gummivory and gut morphology in two sympatric callitrichids (callithrix emiliae and saguinus fuscicollis weddelli) from western brazilian amazonia. | a comparative analysis of the gastrointestinal tracts of wild-caught marmosets, callithrix emiliae, and tamarins, saguinus fuscicollis weddelli, was undertaken in order to evaluate the degree of specialisation for digestion of plant exudates. compared to s.f. weddelli, c. emiliae exhibits a reduced small intestine and a relatively large, compartmentalised caecum in which gum is probably fermented. the apparent specialisation of the digestive tract in c. emiliae correlates with that of its dentit ... | 1992 | 1510116 |
| vertical clinging, small body size, and the evolution of feeding adaptations in the callitrichinae. | primates of the subfamily callitrichinae (callimico, callithrix, leontopithecus, and saguinus) are small-bodied new world monkeys (105-700 g) possessing clawlike nails on all manual and pedal digits excluding the hallux. specialized nails in these genera serve a critical function in feeding by enabling tamarins and marmosets to cling to trunks and other large vertical supports while exploiting food resources. within the subfamily, there is evidence of at least four distinct large-branch feeding ... | 1992 | 1503119 |
| structure and synthesis of hemoglobin in marmosets (saguinus fuscicollis). | marmoset reticulocytes and bone marrow provide a valuable tissue resource for the study of primate hemoglobin structure and synthesis. the amino acid sequence of the marmoset hemoglobin has been determined, and the close homology between it and that of the human suggest it may be a valuable model for study of the effects of chemical modification on hemoglobin function. hemoglobin synthesis by fetal bone marrow has been reported to be stimulated by physiologic levels of l-thyroxine. differences i ... | 1978 | 417320 |
| social interaction with non-averse group-mates modifies a learned food aversion in single- and mixed-species groups of tamarins (saguinus fuscicollis and s. labiatus). | for social species, being a member of a cohesive group and performing activities as a coordinated unit appear to provide a mechanism for the efficient transmission of information about food. social learning about food palatability was investigated in two captive primates, saguinus fuscicollis and s. labiatus, which form stable and cohesive mixed-species groups in the wild. we explored whether an induced food aversion toward a preferred food is modified during and after social interaction with no ... | 2005 | 15834888 |
| seed dispersal by sympatric tamarins, saguinus mystax and saguinus fuscicollis: diversity and characteristics of plant species. | in a comparative study of saguinus mystax and saguinus fuscicollis, we examined the spectrum of plant species whose seeds are dispersed by these two tamarin species. we characterize these plants in terms of life form, fruit colour, pulp consistency and seed dimensions. the tamarins disperse a much broader spectrum of plant species than previously reported (88 of the total of 155 species exploited for fruit). while the distribution over plant life form, fruit colour and pulp consistency is identi ... | 2010 | 12606849 |
| assessing habitat utilization by neotropical primates: a new approach. | this study aims to ascertain habitat utilization, in relation to forest structural variation, by a multi-species group of primates in tropical lowland rainforest in southeast peru during dry season. a new approach to assessing habitat utilization was used. habitat variation was described by structural and indicator variables collected in quadrats along transects through a study area within terra firme and floodplain forest. variables were grouped into 'factors' accounting for most of the variati ... | 2002 | 12091748 |
| single-copy nuclear dna sequences obtained from noninvasively collected primate feces. | noninvasively collected primate feces have been shown to provide a useful source of mitochondrial dna for sequencing and nuclear microsatellite dna for size analysis. in this study, single-copy nuclear dna sequences were obtained from noninvasively collected fecal samples of two species of wild tamarins, saguinus fuscicollis and s. mystax, in the context of a project on the functional utility of color vision. noninvasive genotyping of the x-linked opsin gene is important for future studies of se ... | 2002 | 11857654 |
| crested eagle (morphnus guianensis) predation on infant tamarins (saguinus mystax and saguinus fuscicollis, callitrichinae). | | 2006 | 11805427 |
| interspecific variation of scent-marking behaviour in wild tamarins, saguinus mystax and saguinus fuscicollis. | the scent-marking behaviour of sympatric moustached, saguinus mystax, and saddle-back tamarins, saguinus fuscicollis, was compared in order to explore interspecific differences and potential sources of variation. the author examined basic patterns of scent marking (types, intensity, complexity), substrate use (type, orientation, height), and social patterning of scent marking in three groups of s. mystax and one group of s. fuscicollis at the estación biológica quebrada blanco, peruvian amazonia ... | 2006 | 11805422 |
| subspecific genetic differences in the saddle-back tamarin (saguinus fuscicollis) postcranial skeleton. | saddle-back tamarins (saguinus fuscicollis) have been differentiated into subspecies based on coat color and facial morphology. morphology of first-generation genetic hybrids can provide an understanding of population differences and evolution that may otherwise be difficult to obtain. this study compares postcranial morphology in two hybrids of saddle-back tamarins (s. f. illigeri x s. f. lagonotus and s. f. illigeri x s. f. leucogenys) to the purebred subspecies. we examine whether postcranial ... | 2001 | 11329167 |
| vertebrate predation by sympatric tamarins, saguinus mystax and saguinus fuscicollis. | vertebrate predation was examined in sympatric moustached tamarins (saguinus mystax) and saddle-back tamarins (saguinus fuscicollis) in the amazon rainforest of northeastern peru. both species prey on frogs and lizards, and very rarely on nestling birds. as a result of divergent foraging strategies, s. mystax primarily exploited frogs at higher strata of the forest, while s. fuscicollis predominantly preyed on reptiles in the lower strata and on the ground. this difference may strengthen the nic ... | 2000 | 10830798 |