Monkey-dung study offers clues about land-use, wildlife ecology

Fecal matter of red colobus monkeys collected in western Uganda has yielded a wealth of knowledge about human land-use change and wildlife health and conservation. The main lesson, researchers say, is that the intensity of tree removal translates directly to parasite populations and the risk of infection of their hosts.

In an effort to glean predictive power out of years of research on the effects of forest fragmentation on various species and ecological processes, researchers looked at nine differently fragmented regions of forests located in what is now agricultural landscape just west of Kibale National Park, in the foothills of the Ruwenzori Mountains. Within these regions, they focused on populations of red colobus (Piliocolobus tephrosceles) monkeys and the presence of strongyle and rhabditoid nematodes.

For two years, Thomas R. Gillespie, a professor of pathobiology in the University of Illinois College of Veterinary Medicine, and Colin A. Chapman, an anthropologist at McGill University in Canada, surveyed the monkeys and determined nematode levels by examining 536 colobus fecal samples. Their study appears in the April issue of the journal Conservation Biology.

Gillespie is co-director with Illinois pathobiology colleague Tony Goldberg of the Kibale EcoHealth Project, a flagship program of the multidisciplinary U. of I. Earth and Society Initiative on Emerging Disease & Ecosystem Health.

Red colobus are one of the most endangered African colobine species. The two groups of nematodes have been documented to infect red colobus and have the capacity to cause gastrointestinal problems that can be fatal.

Gillespie and Chapman sorted through nine potential factors, including physical and biological attributes. They concluded that the degradation of the forest and human presence, as measured in stump density, strongly influenced the prevalence of parasitic nematodes. Infection risk, they reported also was higher in the fragme

Contact: Jim Barlow, Life Sciences Editor
University of Illinois at Urbana-Champaign

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