Population estimation of proboscis monkey (Nasalis larvatus) with new analysis based on forest types in Sarawak Malaysian Borneo


Citation

Charlie Justin Mergie Laman, . and Ahmad Fitri Aziz, . Population estimation of proboscis monkey (Nasalis larvatus) with new analysis based on forest types in Sarawak Malaysian Borneo. pp. 91-101. ISSN 1823-8556

Abstract

A new method of analysis of estimation based on forest types has been conducted on proboscis monkey to update the out-dated population estimation of this primate in Sarawak. Boat survey technique was applied in all surveyed sites (except in Bako National Park) within a period of 17 months starting from April 2015 to August 2016. A cumulative riverbank distance of 618.6 km and a line transect of 24.14 km were surveyed. In this study the estimation was conducted based on the forest types surveyed. Overall 9 586 individuals of proboscis monkeys were estimated within three forest types namely mangrove peat swamp and tropical heath (kerangas) forests. Peat swamp forest has the highest population of 6 174 individuals with an estimated population density of 0.96 individuals/km2. The estimated populations in mangrove and tropical heath forests are 1 789 and 1 623 individuals and with estimated population densities of 1.13 and 2.76 individuals/km respectively. A comparison of population estimates from different studies is complicated by their different methods of analyses. A standard method of analysis in lieu of using forest types in the estimation is needed so that the population estimates and the changes in the population size of the proboscis monkeys can be systematically compared and monitored in the future.


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Abstract

A new method of analysis of estimation based on forest types has been conducted on proboscis monkey to update the out-dated population estimation of this primate in Sarawak. Boat survey technique was applied in all surveyed sites (except in Bako National Park) within a period of 17 months starting from April 2015 to August 2016. A cumulative riverbank distance of 618.6 km and a line transect of 24.14 km were surveyed. In this study the estimation was conducted based on the forest types surveyed. Overall 9 586 individuals of proboscis monkeys were estimated within three forest types namely mangrove peat swamp and tropical heath (kerangas) forests. Peat swamp forest has the highest population of 6 174 individuals with an estimated population density of 0.96 individuals/km2. The estimated populations in mangrove and tropical heath forests are 1 789 and 1 623 individuals and with estimated population densities of 1.13 and 2.76 individuals/km respectively. A comparison of population estimates from different studies is complicated by their different methods of analyses. A standard method of analysis in lieu of using forest types in the estimation is needed so that the population estimates and the changes in the population size of the proboscis monkeys can be systematically compared and monitored in the future.

Additional Metadata

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Item Type: Article
AGROVOC Term: Monkeys
AGROVOC Term: Primates
AGROVOC Term: Endangered species
AGROVOC Term: Population density
AGROVOC Term: Surveys
AGROVOC Term: Forests
AGROVOC Term: Mangrove forests
AGROVOC Term: Riverbanks
AGROVOC Term: Population distribution
AGROVOC Term: Animal population
Depositing User: Mr. AFANDI ABDUL MALEK
Last Modified: 24 Apr 2025 00:54
URI: http://webagris.upm.edu.my/id/eprint/8110

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