Publications

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the social life of a black-and-white colobus monkey, colobus guereza.to investigate relationships between ecology and social organization, observations were made on several populations of colobus guereza in east africa in 1970-74. study time was concentrated in the kibale forest and the kabalega national park, uganda. findings on social behaviour are reported in this paper. assessments of group composition were made. the repertoire of communicatory acts was analysed. during five-day continuous observation periods at kibale (12 consecutive months) and at kabalega ...1977414475
positional behavior in five sympatric old world monkeys.observations of positional behavior and habitat use were recorded on focal individuals of five species of old world monkeys at kibale forest, uganda, through the dry season of 1990 and 1991. cercopithecus ascanius, cercopithecus mitis, cercocebus albigena, colobus badius, and colobus guereza commonly utilize five similar types of positional behavior (i.e., quadrupedalism, leaping, climbing, sitting, and standing), but in varying frequencies and situations. as a group, colobines use oblique suppo ...19957645673
behavioral and endocrine dynamics associated with infanticide in a black and white colobus monkey (colobus guereza).infanticide has been observed in several colobines, but only one infanticide has previously been documented for black and white colobus monkeys (colobus guereza). this report describes an infanticide observed in kibale national park, uganda, in the summer of 2001. an adult male from a neighboring group attacked and killed a young infant whose mother subsequently remained in her own group and was observed mating 10 days later. she engaged in two mating periods of several days each, separated by a ...200314610731
predicting folivorous primate abundance: validation of a nutritional model.understanding the determinants of animal abundance has become more vital as ecologists are increasingly asked to apply their knowledge to the construction of informed management plans. however, there are few general models are available to explain variation in abundance. some notable exceptions are studies of folivorous primates, in which the protein-to-fiber ratio of foods has been shown to predict biomass. here we examine the generality of milton's [american naturalist 114:363-378, 1979] prote ...200414983464
spatial distribution of primates in a mosaic of colonizing and old growth forest at ngogo, kibale national park, uganda.primate censuses were conducted in a mosaic of colonizing (two locations) and old-growth forests using line transect methods at the ngogo study site, kibale national park, uganda. black and white colobus monkeys (colobus guereza) were encountered more frequently in the colonizing forests than in the old growth forest, while chimpanzees (pan troglodytes) were encountered more frequently in the old growth forest than in colonizing forests. although not significant, results suggest that blue monkey ...200616479411
primate abundance along five transect lines at ngogo, kibale national park, uganda.using the line transect methods, i studied the primate density at ngogo, kibale national park, uganda for 18 months. comparisons with other studies show that the population of red colobus monkeys (procolobus rufomitratus) and blue monkeys (cercopithecus mitis) is declining, whereas the populations of black-and-white colobus (colobus guereza), red-tailed monkeys (cercopithecus ascanius), grey-cheeked mangabeys (lophocebus albigena), baboons (papio anubis), and chimpanzees (pan troglodytes) remain ...200717330309
variation in diet and ranging of black and white colobus monkeys in kibale national park, uganda.recently, considerable intraspecific variation in the diets and ranging behavior of colobine monkeys has been described, although in most cases this has involved documenting variation between, not within, sites. some african colobines, such as guerezas (colobus guereza), are relatively abundant in disturbed habitats that are very heterogeneous, raising the intriguing possibility that even groups with overlapping home ranges may exhibit large behavioral differences. if such differences occur, it ...200717429575
giardia sp. and cryptosporidium sp. infections in primates in fragmented and undisturbed forest in western uganda.in june 2005, we collected 115 fecal samples from wild primates in western uganda and examined them for cryptosporidium sp. and giardia sp. with the use of immunofluorescent antibody (ifa) detection. we sampled primates from an undisturbed forest in kibale national park and from 3 highly disturbed forest fragments outside the park. of disturbed forest samples, red colobus (pilocolobus tephrosceles) and red-tailed guenons (cercopithecus ascanius) harbored species of cryptosporidium or giardia, bu ...200717539436
forest fragmentation, the decline of an endangered primate, and changes in host-parasite interactions relative to an unfragmented forest.forest fragmentation may alter host-parasite interactions in ways that contribute to host population declines. we tested this prediction by examining parasite infections and the abundance of infective helminths in 20 forest fragments and in unfragmented forest in kibale national park, uganda. over 4 years, the endangered red colobus (procolobus rufomitratus) declined by 20% in fragments, whereas the black-and-white colobus (colobus guereza) in fragments and populations of both colobines in unfra ...200817879941
neither genetic nor observational data alone are sufficient for understanding sex-biased dispersal in a social-group-living species.complex sex-biased dispersal patterns often characterize social-group-living species and may ultimately drive patterns of cooperation and competition within and among groups. this study investigates whether observational data or genetic data alone can elucidate the potentially complex dispersal patterns of social-group-living black and white colobus monkeys (colobus guereza, "guerezas"), or whether combining both data types provides novel insights. we employed long-term observation of eight neig ...200919302351
coinfection of ugandan red colobus (procolobus [piliocolobus] rufomitratus tephrosceles) with novel, divergent delta-, lenti-, and spumaretroviruses.nonhuman primates host a plethora of potentially zoonotic microbes, with simian retroviruses receiving heightened attention due to their roles in the origins of human immunodeficiency viruses type 1 (hiv-1) and hiv-2. however, incomplete taxonomic and geographic sampling of potential hosts, especially the african colobines, has left the full range of primate retrovirus diversity unexplored. blood samples collected from 31 wild-living red colobus monkeys (procolobus [piliocolobus] rufomitratus te ...200919692478
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