Food selection by two South-east Asian colobine monkeys (Presbytis rubicunda and Presbytis melalophos) in relation to plant chemistry

Abstract

The diets of the banded leaf monkey (Presbytis melalophos) at Kuala Lompat in the Krau Game Reserve of West Malaysia and the red leaf monkey (Presbytis rubicunda) in Sepilok Virgin Jungle Reserve, Sabah, East Malaysia have been examined in relation to plant chemistry. Both monkeys spent about half their time eating foliage, and about half their time eating fruits and seeds. 'l'hey both favoured leaves with high digestibility (due to relatively low levcls of fibre) and high levcls of protein, a combination found predominantly in young leaves and some flowers. The monkeys appeared to favour seeds and fruits with high concentrations of storage carbohydratcs or fats, but not those rich in simple sugars. Selection of seeds and fruits was not correlated with protein content.An analysis of the fibre and protein contents of foods showed that, on an annual basis, the two monkeys achieved a comparable intake for both items. However, these diets were obtained in radically different ways. Presbyfis melalophos was able to eat foliage from many of the common tree species in its home range, whereas P. rubicunda relied on rare trees and lianas. This difference is attributed to the very high density of Dipterocarpaceae at Sepilok, a tree family that provides little food for colobines. The rarity of P. rubicunda's food plants at Sepilok is considered to be the main reason for the greater home range size and lower population density in comparison to P. melalophnr.Finally, the biochemical profiles of the young leaf diet of these two monkeys were compared with previously published information on two African and one south Indian colobines. In many respects the intake of supposed critical components, protein and fibre, showed marked similarities between different animals, considering contrasts in their habitats.

Termite Soil Eating in Kirindy Sifakas (Madagascar): Proposing a New Proximate Factor

“…Nevertheless, no apparent association between occasional termite soil eating and seasonal feeding changes was noticed in the Kirindy sifakas. This is consistent with the results of observations in colobines, which are also specialised for folivory (Presbytis entellus [Hladik, 1977]; P. rubicunda [Davies et al, 1988]; Procolobus badius gordonorum [A. Pucci, pers. commun.]).…”

Habitat Use by White-Thighed Colobus in the Kikélé Sacred Forest: Activity Budget, Feeding Ecology and Selection of Sleeping Trees

“…Our findings are congruent with previous works that suggest that the Leguminosae provides the main food sources for colobus monkeys (Davies et al 1988). Consumption of Erythrophleum suaveolens leaves by C. vellerosus was also confirmed despite their toxicity (see Kay and Davies 1994).…”

Nutritional Aspects of Fruit Choice by Chimpanzees

“…Alouatta palliata [10]; Colobus polykomos [11]; Presbytis johnii [12]; P. melalophos and P. rubicunda [13]; C. guereza [14]; C. satanas [15]; P. entellus [16]; Gorilla gorilla beringei [17]. Only a few nutrition-oriented studies on food selection, however, especially fruit choice, in frugivorous primates such as the chimpanzees have been conducted (Pongo pygmaeus [18]; G. g. gorilla [19]).…”