Publications

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a craniometric study of the black and white colobus illiger 1811 (primates: ceropithecoidea).this study examines the craniometry of black and white colobus monkeys using 1072 specimens representing all the recognized subspecies (after rahm, '70) of the genus. seventy-six measurements were taken on each individual, and examined using canonical variates analysis and clustering by ward's error sum method. the assumptions of the analytical techniques are shown to be met, and the results demonstrated to be stable. examination of the populations for statistical difference and taxonomic distin ...1979114059
notes on the ecology and behaviour of the angola colobus (colobus angolensis p. l. sclater 1860) in n.e. tanzania. 20144204887
taxonomy and phylogeny of black-and-white colobus monkeys. inferences from an analysis of loud call variation.field recordings of male loud calls (or roars) from each major form of black-and-white colobus monkey have been analyzed spectrographically, and features of tempo and pitch measured. considered together with data on cranial dimensions, coat pattern, and geographical distribution, the results of this analysis suggest that there are five species of black-and-white colobus: colobus angolensis, c. guereza, c. polykomos, c. satanas, and c. vellerosus. c. guereza and c. vellerosus may have differentia ...19836862326
differential habitat utilizati of four cercopithecidae in a kenyan forest.the presence of papio cynocephalus, cercopithecus mitis, cercopithecus aethiops and colobus angolensis in a small coastal forest is attributed to their differential habitat utilization. data on diet, space-use patterns and polyspecific associations are given. habitat partitioning is found to be resource-related and is accomplished through differential reliance on resources as well as different means of exploiting overlapping resources. the implications of the data for understanding the relations ...1977403113
anogenital distance as a measure of male competitive ability in rwenzori angolan colobus.anogenital distance (agd) is positively correlated to fetal androgen exposure and developmental masculinization in mammals. independent of overall body size, agd shows a strong positive correlation with male fertility and in rodents, agd is a good indicator of male competitive ability and is associated with female choice. we hypothesized that agd will also predict male competitive ability in non-human primates. to test this, we measured agd noninvasively with a parallel laser in a wild populatio ...202032083334
spatiotemporal association patterns in a supergroup of rwenzori black-and-white colobus (colobus angolensis ruwenzorii) are consistent with a multilevel society.primates display broad diversity in their social organization. the social groups of a few primate species are organized in a multilevel fashion, with large groups composed of multiple, core one-male units (omus). a characteristic of multilevel societies is that the higher levels can include hundreds of individuals. the rwenzori black-and-white colobus (colobus angolensis ruwenzorii) in the montane forests of rwanda form supergroups and have been suspected to exhibit multilevel social organizatio ...202032249977
diet and activity budget in colobus angolensis ruwenzorii at nabugabo, uganda: are they energy maximizers?colobine monkeys are specialized folivores that use foregut fermentation to digest leaves. the slow process of fermentation forces them to spend a lot of time resting and to minimize their energy expenditure to subsist on a lower-quality diet.202033130677
a unique case of extra-group infant adoption in free-ranging angola black and white colobus monkeys (colobus angolensis palliatus).infant adoption has been reported in a variety of primate taxa both in captive and natural settings. adoption by females may be adaptive by increasing inclusive fitness via shared genes between adoptive mother and adoptee or by providing valuable maternal practice which, in turn, may increase the female's future reproductive success. others have argued that adoption may be non-adaptive and the result of a general attraction toward infants. our study examines a unique case of adoption by an adult ...201626872896
the role of leaf toughness on foraging efficiency in angola black and white colobus monkeys (colobus angolensis palliatus).examining the relationships among foraging behavior, food mechanical properties, and masticatory morphology is a bourgeoning research topic among behavioral ecologists and functional morphologists. the purpose of this study was to assess the degree to which leaf toughness influences foraging efficiency with regard to ingestion rate, masticatory investment, and masticatory rate.201627346431
novel simian foamy virus infections from multiple monkey species in women from the democratic republic of congo.zoonotic transmission of simian retroviruses in central africa is ongoing and can result in pandemic human infection. while simian foamy virus (sfv) infection was reported in primate hunters in cameroon and gabon, little is known about the distribution of sfv in africa and whether human-to-human transmission and disease occur. we screened 3,334 plasmas from persons living in rural villages in central democratic republic of congo (drc) using sfv-specific eia and western blot (wb) tests. pcr ampli ...201223217108
phylogeography of the angolan black and white colobus monkey, colobus angolesnsis palliatus, in kenya and tanzania.little is known about genetic variation in the 6-8 subspecies of colobus angolensis, currently distinguished by pelage differences. we present a comparative genetic analysis of one of these subspecies, c. a. palliatus, in kenya and tanzania that assesses evolutionary relationships and patterns of mitochondrial genetic diversity in 103 individuals across its geographic range. fecal samples from approximately 156 individuals were collected in four localities: (1) diani forest, kenya; (2) shimoni, ...201020568263
fallback foods of temperate-living primates: a case study on snub-nosed monkeys.only a few primate species thrive in temperate regions characterized by relatively low temperature, low rainfall, low species diversity, high elevation, and especially an extended season of food scarcity during which they suffer from dietary stress. we present data of a case study of dietary strategies and fallback foods in snub-nosed monkeys (rhinopithecus bieti) in the samage forest, northwest yunnan, prc. the snub-nosed monkeys adjusted intake of plant food items corresponding with changes in ...200919890849
passage marker excretion in red kangaroo (macropus rufus), collared peccary (pecari tajacu) and colobine monkeys (colobus angolensis, c. polykomos, trachypithecus johnii).ruminants are characterized by an efficient particle-sorting mechanism in the forestomach (frst) followed by selective rechewing of large food particles. for the nonruminating foregut fermenter pygmy hippo it was demonstrated that large particles are excreted as fast as, or faster than, the small particles. the same has been suggested for other nonruminating foregut fermenters. we determined the mean retention time of fluids and different-sized particles in six red kangaroos (macropus rufus), se ...200919551808
craniofacial variation and dietary adaptations of african colobines.african colobine monkeys show considerable craniofacial variation among species, although the evolutionary causes of this diversity are unclear. in light of growing evidence that diet varies considerably among colobine species, we investigated whether colobine craniofacial morphology varies as a function of their diet. we compared craniofacial morphology among five african species: colobus angolensis, c. guereza, c. polykomos, piliocolobus badius, and p. verus. matrix correlation analysis indica ...200919447469
a survey for cyclospora spp. in kenyan primates, with some notes on its biology.from march 1999 through august 2000, 511 stool samples collected from 11 different primate species in 10 geographically distinct locations in kenya, east africa, were screened for the presence of cyclospora spp. oocysts. positive samples (43/102, 42%) were identified in vervet monkeys (cercopithecus aethiops) in 4 of 4 locations; 19/206 (9%) in yellow and olive baboons (papio cynocephalus, p. anubis, respectively) in 5 of 5 locations; and 19/76 (25%) in black and white colobus monkeys (colobus a ...200111780827
genetically engineered mengo virus vaccination of multiple captive wildlife species.encephalomyocarditis virus (emcv), has caused the deaths of many species of animals in zoological parks and research institutions. the audubon park zoo, (new orleans, louisiana, usa) attempted vaccination of several species with a killed emcv vaccine with mixed results. this paper reports an attempt at vaccination against emcv using a genetically engineered, live attenuated mengo virus (vmc0) at the audubon park zoo and miami metro zoo, (miami, florida, usa) from december 1996 to june 1997. seve ...199910231768
a multi-level society comprised of one-male and multi-male core units in an african colobine (colobus angolensis ruwenzorii).several mammalian species exhibit complex, nested social organizations, termed multi-level or modular societies. multi-level societies comprise stable core units that fission and fuse with one another in a hierarchical manner, forming groups that vary in size over time. among nonhuman primates, these social systems have been confirmed in several african papionin and asian colobine species. we use data from august 2017 to july 2018 on individually-recognized rwenzori angolan colobus living near l ...201931618212
spatial patterns of primate electrocutions in diani, kenya.electrocution from power infrastructure threatens many primate species, yet knowledge of effective evidence-based mitigation strategies is limited. mitigation planning requires an understanding of the spatial distribution of electrocutions to prioritize high-risk areas. in diani, a coastal kenyan town, electrocution is an important cause of death for five primate species. in this study we aim to describe the spatial patterns of electrocutions and electric shock incidents (collectively referred t ...201830369684
effects of anthropogenic disturbance on primate density at the landscape scale.accurate estimations of the abundance of threatened animal populations are required for assessment of species' status and vulnerability and conservation planning. however, density estimation is usually difficult and resource demanding, so researchers often collect data at local scales. however, anthropogenic pressures most often have landscape-level effects, for example, through habitat loss and fragmentation. we applied hierarchical distance sampling (hds) to transect count data to determine th ...201930561170
census, habitat preference, and polyspecific associations of six monkeys in the lomako forest, zaire.this paper reports preliminary data on a number of poorly known cercopithecids inhabiting the lomako forest, zaire. data include those on density, biomass, group size, the relationship between group type (mono vs. polyspecific) and forest type (mixed primary, secondary, monodominant primary, and swamp), and vertical stratification. species examined are colobus angolensis, cercocebus aterrimus, cercopithecus wolfi, cercopithecus ascanius, cercopithecus neglectus, and allenopithecus nigroviridis. ...199431936961
proximity and grooming patterns reveal opposite-sex bonding in rwenzori angolan colobus monkeys (colobus angolensis ruwenzorii).close proximity and social grooming are important bonding mechanisms in primates. these behaviors show the social structure of a species and many studies have found positive correlations between the degree of kinship and grooming and proximity. we used 1 year of data collected via instantaneous scan sampling on a large "supertroop" of colobus angolensis ruwenzorii at lake nabugabo, uganda, to examine partner preferences for grooming and nearest neighbors in each age-sex class. little is known ab ...201829270880
clonal spread of yersinia enterocolitica 1b/o:8 in multiple zoo species.yersinia enterocolitica (ye) bioserotype 1b/o:8 (ye 1b/o:8) was identified in routine culture of a variety of zoo species housed at omaha's henry doorly zoo and aquarium (ohdza) from april to july 2011. animal cases representing 12 species had ye detected from 34 cases during routine fecal monitoring and/or during postmortem examination: coquerel's sifakas (propithecus coquereli, two cases), black & white (bw) ruffed lemurs (varecia variegata variegata, six cases), red ruffed lemurs (varecia rub ...202032212560
the angola black-and-white colobus (colobus angolensis palliatus) in kenya: historical range contraction and current conservation status.the angola black-and-white colobus (colobus angolensis palliatus) is a flagship species for kenya's coastal forests, a global biodiversity hotspot and a region for "priority" conservation investment. this study provides the first evaluation of colobus distribution, status, and current threats within its kenyan range: the southern coastal district of kwale. line transect and sweep count surveys were carried out between july and november of 2001, covering 25,514 ha of coastal forest within 124 for ...200717253633
vegetative predictors of primate abundance: utility and limitations of a fine-scale analysis.determining ecological predictors of primate abundance is important for both theoretical and applied conservation management. for forest primates, research has focused on comparisons of primate abundance and vegetation in different forest blocks or forest compartments with different management histories. however, great variation in primate abundance often occurs within single forests, especially in mountainous areas or in areas with habitat mosaics due to past disturbance. here we assess, for th ...200717358022
ontogeny of positional behavior and support use among colobus angolensis palliatus of the diani forest, kenya.in this project i studied black and white colobus monkeys (colobus angolensis palliatus) inhabiting the diani forest of south coastal kenya to test whether activity budgets, positional behavior, and support use differed among individuals in three age categories (juveniles, subadults, and adults). data for three habituated groups were collected from june to august 2012 and from may to july 2014. instantaneous sampling and pooled data were used to create overall behavior profiles for the three age ...201525649167
the complete mitochondrial genome of colobus angolensis palliatus.colobus angolensis palliatus (c.a. palliatus), known as the angolan black-and-white colobus monkey, is an old world monkey, belonging to the colobus genus. it is a subspecies of c. angolensis. here, we describe the complete mitochondrial genome (mitogenome) sequence of c.a. palliatus. the genome is 16 850 bp in length, comprising 13 protein-coding genes, 22 trnas, 2 rrnas, and a major non-coding region. phylogenic tree was constructed based on the complete mitogenome of c.a. palliatus and closel ...201626540578
quantifying soluble carbohydrates in tropical leaves using a portable mid-infrared sensor: implications for primate feeding ecology.identifying the nutritional composition of food items has significant ramifications for primate feeding ecology, which, in turn, influences investigations of primate sociality, cognition, and conservation. the aim of our study was to analyze water soluble carbohydrate (wsc) concentrations in the leaves of trees common to the diani forest of kenya. many of these leaves are consumed by black and white colobus monkeys (colobus angolensis palliatus). we assessed whether the infrared spectral data co ...201626822452
differences between ecological niches in northern and southern populations of angolan black and white colobus monkeys (colobus angolensis palliatus and colobus angolensis sharpei) throughout kenya and tanzania.ecological niche models can be useful for clarifying relationships between environmental factors and a species' geographic distribution. in this study, we use presence-only data and environmental layers to create an ecological niche model to better understand the distribution of the east african angolan black and white colobus monkey, colobus angolensis palliatus, and to assess whether the model supports considering the population as two separate subspecies, colobus angolensis sharpei and c. a. ...201931020687
nutrient intake and balancing among female colobus angolensis palliatus inhabiting structurally distinct forest areas: effects of group, season, and reproductive state.understanding intraspecific behavioral and dietary variation is critical for assessing primate populations' abilities to persist in habitats characterized by increasing anthropogenic disturbances. while it is evident that some species exhibit considerable dietary flexibility (in terms of species-specific plant parts) in relation to habitat disturbance, it is unclear if primates are characterized by similar variation and flexibility regarding nutrient intake. this study examined the effects of gr ...201829882365
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