The significance of fibrous foods for Kibale forest Chimpanzees

Four categories of plant dominated the diet of chimpanzees in Kibale forest; Uganda: non-fig tree fruits; fig tree fruits; herbaceous piths and terrestrial leaves. Fruit abundance varied unpredictably; more among non-figs than figs. Pith intake was correlated negatively with fruit abundance and low sugar and protein levels. Compared with fruits and leaves they are consistently high in hemicellulose and cellulose; which are insoluble fibres partly digestible by chimpanzees. Herbaceous paths appear to be a vital resource for African forest apes; offering an alternative energy supply when fruits are ecarse