Census, habitat preference, and polyspecific associations of six monkeys in the Lomako Forest, Zaire

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Abstract
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. The density and biomass for the Lomako Forest anthropoids (excluding Cercopithecus neglectus and A. nigroviridis) are 165 ind/km2 and 1,034 kg/km2, respectively. Cercopithecus wolfi and Colobus angolensis are found in group sizes similar to those reported from other sites while Cercopithecus ascanius, Cercocebus aterrimus, and A. nigroviridis display group sizes unique to the Lomako. While Colobus angolensis, Cercocebus aterrimus, Cercopithecus ascanius and Cercopithecus wolfi were found, to varying extents, in all four forest types, Cercopithecus neglectus and A. nigroviridis inhabited only swamp forest. The different species sort out along vertical continua both within and between the four forest types.

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