| transmission dynamics of cryptosporidium infection in a natural population of non-human primates at polonnaruwa, sri lanka. | infections from cryptosporidium parvum are of interest not only to public health, but also to wildlife conservation, particularly when humans and livestock encroach on nature and thereby increase the risk of cross-species transmissions. to clarify this risk, we used polymerase chain reaction to examine the hypervariable region of the c. parvum 18s rrna gene in feces from three monkey species. samples were isolated from regions where disease transmission between monkeys, livestock, and humans was ... | 2007 | 17984333 |
| prevalence of cryptosporidium and other enteric parasites among wild non-human primates in polonnaruwa, sri lanka. | cryptosporidiosis is a rapidly emerging disease in the tropics. this is the first report of cryptosporidium and other protozoan infections (entamoeba spp., iodamoeba, chilomastix, and balantidium spp.) in wild primates that inhabit the natural forest of sri lanka. it is unclear if non-human primates serve as a reservoir for these parasites under certain conditions. a cross-sectional coprologic survey among 125 monkeys (89 toque macaques, 21 gray langurs, and 15 purple-faced langurs) indicated th ... | 2006 | 16474091 |
| assessing public perceptions and solutions to human-monkey conflict from 50 years in sri lanka. | sri lanka is a biodiversity hotspot with high human density that contributes to increasing human-monkey conflict (hmc). in 50 years of primate studies there, the development of hmc has been documented, and many workshops and interventions organized to ameliorate hmc. these activities prompted the present survey. in the extensive lowland dry zone of sri lanka, the affected nonhuman primates are the toque macaque, gray and purple-faced langurs and slender loris. we surveyed and evaluated the attit ... | 2019 | 30814470 |
| mixed-species associations and attempted mating suggest hybridization between purple-faced and tufted gray langurs of sri lanka. | hybridization is increasingly recognized as an important mechanism of evolutionary change in the order primates. here, we present the first observational data supporting natural hybridization between the critically endangered purple-faced langur (semnopithecus vetulus philbricki) and the threatened tufted gray langur (semnopithecus priam thersites) in kaludiyapokuna forest reserve in sri lanka. in one case study, we observed a long-term (> 1 year) mixed-species group consisting of one adult tuft ... | 2020 | 32804328 |
| an ethnoprimatological approach to assessing levels of tolerance between human and commensal non-human primates in sri lanka. | human and non-human primates increasingly are forced to live commensally, and understanding the human-nonhuman interconnections are paramount in understanding tolerance and conflict. in our study area, the heavily deforested parts of southern sri lanka humans and primates live side by side and prevalent religious tenets encourage a peaceful co-existence. we quantify the attitudes of rural communities towards three resident primate species (red slender loris, purple-faced langur, toque macaque) a ... | 2013 | 23836757 |
| diet versus phylogeny: a comparison of gut microbiota in captive colobine monkey species. | both diet and host phylogeny shape the gut microbial community, and separating out the effects of these variables can be challenging. in this study, high-throughput sequencing was used to evaluate the impact of diet and phylogeny on the gut microbiota of nine colobine monkey species (n = 64 individuals). colobines are leaf-eating monkeys that fare poorly in captivity-often exhibiting gastrointestinal (gi) problems. this study included eight asian colobines (rhinopithecus brelichi, rhinopithecus ... | 2017 | 28735426 |
| molecular systematics and conservation of the langurs and leaf monkeys of south asia. | numerous morphology-based classification schemes have been proposed for langurs and leaf monkeys of south asia but there is very little agreement between them. an incorrect classification scheme when used as a basis for biogeographic studies can support erroneous hypotheses. further, lack of taxonomic resolution will also confound conservation efforts, given that conservation biologists use traditional morphology-based-classification schemes to prioritize species for conservation. here, i have r ... | 2010 | 21273689 |
| craniodental mechanics and diet in asian colobines: morphological evidence of mature seed predation and sclerocarpy. | folivory has been accepted as the general dietary pattern for colobines. however, recent ecological studies have revealed that extensive seed eating is found in some colobine species. the ripeness of foraged seeds is also reported to differ between seed eaters. as seeds are generally stress-limited and may pose greater mechanical demands, seed-eating species are predicted to exhibit morphological features adaptive for seed predation. in addition, species that feeds on seeds from unripe fruits wi ... | 2010 | 20091848 |
| molecular phylogeny and biogeography of langurs and leaf monkeys of south asia (primates: colobinae). | the two recently proposed taxonomies of the langurs and leaf monkeys (subfamily colobinae) provide different implications to our understanding of the evolution of nilgiri and purple-faced langurs. groves (2001) [groves, c.p., 2001. primate taxonomy. smithsonian institute press, washington], placed nilgiri and purple-faced langurs in the genus trachypithecus, thereby suggesting disjunct distribution of the genus trachypithecus. [brandon-jones, d., eudey, a.a., geissmann, t., groves, c.p., melnick ... | 2008 | 18191589 |
| taeniasis in a purple-faced langur. | | 1985 | 4077664 |
| the reproductive cycles of two subspecies of purple-faced langurs (presbytic senex) with relation to environmental factors. | | 1973 | 4198057 |
| adult male replacement in one-male troops of purple-faced langurs (presbytis senex senex) and its effect on population structure. | | 2014 | 4201908 |
| mitochondrial and nuclear markers suggest hanuman langur (primates: colobinae) polyphyly: implications for their species status. | recent molecular studies on langurs of the indian subcontinent suggest that the widely-distributed and morphologically variable hanuman langurs (semnopithecus entellus) are polyphyletic with respect to nilgiri and purple-faced langurs. to further investigate this scenario, we have analyzed additional sequences of mitochondrial cytochrome b as well as nuclear protamine p1 genes from these species. the results confirm hanuman langur polyphyly in the mitochondrial tree and the nuclear markers sugge ... | 2010 | 19897046 |
| retention marker excretion suggests incomplete digesta mixing across the order primates. | the digestive tract of animals, and the patterns how passage markers are excreted from them, have been fruitfully compared to chemical reactor models from engineering science. an important characteristic of idealized reactor models is the smoothness of the curves plotting marker concentrations in outflow (i.e., faeces) over time, which is the result of the assumed complete mixing of the marker with the reactor contents. published excretion patterns from passage experiments in non-primate mammals ... | 2019 | 31125579 |
| loud calls of male purple-faced langurs (presbytis senex). | | 1990 | 2262177 |
| stable carbon, oxygen, and nitrogen, isotope analysis of plants from a south asian tropical forest: implications for primatology. | stable isotope analysis of primate tissues in tropical forest contexts is an increasingly popular means of obtaining information about niche distinctions among sympatric species, including preferences in feeding height, forest canopy density, plant parts, and trophism. however, issues of equifinality mean that feeding height, canopy density, as well as the plant parts and plant species consumed, may produce similar or confounding effects. with a few exceptions, researchers have so far relied lar ... | 2017 | 28345759 |