Mangabey (Cercocebus albigena) population density, group size, and ranging: A twenty‐year comparison

Abstract

Mangabey groups studied in the Kibale Forest Reserve, Uganda, in 1971 were studied again in 1991 using similar data collection protocols. The results were used to assess the effect of group size on activity budgets and travel costs, and to document the effects of habitat changes on mangabey density and demography. Larger mangabey groups traveled longer distances per day than smaller groups. Time budgets were less clearly influenced by group size. Mangabey population density increased over the 20 year period. This increase in population density paralleled habitat changes, particularly an increase in tree density, and was accompanied by increased use of regenerating forest. o

Monitoring Impacts of Natural Resource Extraction on Lemurs of the Masoala Peninsula, Madagascar

“…Primate groups found in disturbed or marginal forests may be smaller when available resources are limited, or larger if regenerating forests produce increased food resources (Ganzhorn 1988, Olupot et al 1994. However, analysis of our preliminary results did not detect a significant difference in group size between study sites that are differentially affected by natural resource extraction by villagers.…”

Understanding long‐term primate community dynamics: implications of forest change

“…Since that time, they may have become important in determining primate abundance. Olupot et al (1994) suggested that these regenerating areas are related to increasing mangabey numbers. However, it is not clear why only mangabey populations responded positively when other species, such as red colobus monkeys, which feed on many of the species recruiting into these regenerating areas, were not increasing in group density (C. A.…”

Skeletal and dental morphology supports diphyletic origin of baboons and mandrills

“…Groves (2) reported numerous cranial differences between the two species groups and urged separation of the albigena group into a separate genus, Lophocebus. Most recently Nakatsukasa (9-11) has documented skeletal differences between the two genera of mangabeys that distinguish the more terrestrial (12)(13)(14)(15) Cercocebus from the more arboreal (16)(17)(18)(19) Lophocebus. Subsequent molecular studies, especially by Disotell (20,21) and colleagues (22,23) have confirmed the polyphyly of the mangabeys and clarified that the central African mandrills and drills (Mandrillus) are the sister taxon of Cercocebus whereas Lophocebus, Papio, and Theropithecus form a separate, unresolved clade.…”