Feeding ecology of the proboscis monkey (Nasalis larvatus)

  title={Feeding ecology of the proboscis monkey (Nasalis larvatus)},
  author={Carey P. Yeager},
  journal={International Journal of Primatology},
  • C. Yeager
  • Published 1 December 1989
  • Environmental Science
  • International Journal of Primatology
Proboscis monkey (Nasalis larvatus) feeding behavior and ecology were studied at the Natai Lengkuas Station, Tanjung Puting National Park, Kalimantan Tengah, Indonesia. Data on feeding behavior were collected using scan sampling during group follows. Three vegetational plots containing 1,732 trees were established and monitored monthly for changes in fruit, flower, and young leaf production. Basal area and canopy cover were calculated and used in estimating food abundance. Proboscis monkeys… 
Feeding ecology of the long-tailed macaque(Macaca fascicularis) in Kalimantan Tengah, Indonesia
  • C. Yeager
  • Environmental Science
    International Journal of Primatology
  • 2007
Long- tailed macaques appear to be selective feeders but can exploit a variety of food sources during periods of food scarcity, and selection ratios for 19 food species indicate that 13 of them were selected more often than expected.
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The diet and feeding behavior of the silver leaf monkey (Trachypithecus auratus sondaicus) in Indonesia
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  • Environmental Science
    International Journal of Primatology
  • 2005
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The ecology and behaviour of proboscis monkey (Nasalis larvatus) in mangrove habitat of Labuk Bay, Sabah
The results indicated that the activity patterns for semi-Wild proboscis monkeys are similar with those In the wild, and the significant positive correlations between monthly feeding frequencies to monthly pancakes and young leaves feeding frequencies suggest that pancakes and mangroves plants are equally important food sources for proboscIS monkeys in LBPMS.
Proboscis Monkey (Nasalis larvatus): Bio-ecology and Conservation
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Proboscis monkeys (Nasalis larvatus) are endemic to Borneo and live in habitats threatened by land clearance for agriculture, aquaculture and timber. This thesis examines the roles of structural and
Behavioural Activities and Foraging Ecology of Proboscis Monkey in Sarawak , Malaysia ( Borneo )
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Population dynamics of the proboscis monkey Nasalis larvatus in the Lower Kinabatangan, Sabah, Borneo, Malaysia
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Status and Conservation of Proboscis Monkeys (Nasalis larvatus) in Sabah, East Malaysia
Abstract: The proboscis monkey (Nasalis larvatus) was surveyed in the East Malaysian state of Sabah to establish its population status and to assess threats to its survival. It was found to be more


Ecology and behavior of the wild proboscis monkey,Nasalis larvatus (Wurmb), in Sabah, Malaysia
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Food selection by black colobus monkeys (Colobus satanas) in relation to plant chemistry
It is proposed that relative importance of digestion-inhibitors, low nutrient content and toxins as constraints on food selection by generalist herbivores will vary greatly among forests with different nutrient and secondary chemistry profiles.
Seasonal Variations of Diet Related to Species and Sex in a Community of Cercopithecus Monkeys
Interspecific differences are related to search strategies which depend on body weight, forest levels used, social roles, etc, which suggests that interspecific competition is important in determining resource partitioning.
Notes on the size and composition of groups of proboscis monkey, Nasalis larvatus.
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  • Biology, Environmental Science
    Folia primatologica; international journal of primatology
  • 1982
Proboscis monkeys, Nasalis larvatus, were observed from a boat in coastal mangrove swamps in Brunei and there was evidence that these parties were of ephemoral composition.
Social organization and ecology of proboscis monkeys (Nasalis larvatus) in mixed coastal forest in Sarawak
The population density, social organization, and feeding and ranging behavior are described in detail, and results are compared with those from other primates in an attempt to understand why females of certain species (including proboscis monkeys) transfer between social groups.
Proboscis monkey (Nasalis larvatus) social organization: Intergroup patterns of association
  • C. Yeager
  • Biology
    American journal of primatology
  • 1991
Proboscis monkey social organization was studied at the Natai Lengkuas station, Tanjung Puting National Park in Kalimantan Tengah, Indonesia and indicated that the groups formed two separate bands, the first evidence for such a two‐tiered system of organization in an arboreal colobine species.
Food selection by the South Indian leaf-monkey, Presbytis johnii, in relation to leaf chemistry
Additional data on mature leaf petioles and young leaves suggest that the high ratio of cell-sap to cell-wall in these items, and their related high digestibility, explain the high relative abundance of these items in the P. johnii diet.
Food selection by two South-east Asian colobine monkeys (Presbytis rubicunda and Presbytis melalophos) in relation to plant chemistry.
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 and showed marked similarities between different animals, considering contrasts in their habitats.
Ecology and behavior ofPresbytis thomasi in Northern Sumatra
The occurrence of male replacement suggests instability of multi-male organization in bisexual troops, and the different mortality rate between males and females and the unequal sex ratios forced by the formation of one-male troops, maintained high tension levels among males competing on females.
Socio-ecological study ofPresbytis aygula in West Java
Field studies of the Sunda Island leaf monkey,Presbytis aygula, were made in the montane forests of West Java at an altitude of 1,400–1,800 m between September 1976 and August 1981. The troop size