Observations on the sexual behavior and birth seasonality of proboscis monkey (Nasalis Larvatus) along the lower Kinabatangan, Northern Borneo

Sexual behavior of Nasalis larvatus was observed along the Lower Kinabatangan River in eastern Sabah, Bornean Malaysia, during a two-year field study. Eight sexual mounts and two non-sexual mounts in one-male groups were recorded using scan sampling and event sampling. All observed copulations compr...

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Main Author: Ramesh Boonratana
Other Authors: Mahidol University. Mahidol University International College. Science Division.
Format: Article
Language:English
Published: 2015
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Online Access:https://repository.li.mahidol.ac.th/handle/123456789/10541
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Institution: Mahidol University
Language: English
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spelling th-mahidol.105412023-04-12T15:25:07Z Observations on the sexual behavior and birth seasonality of proboscis monkey (Nasalis Larvatus) along the lower Kinabatangan, Northern Borneo Ramesh Boonratana Mahidol University. Mahidol University International College. Science Division. Birth seasonality Mating behavior Nasalis larvatus Proboscis monkey Sexual behavior Sexual harassment Sexual behavior of Nasalis larvatus was observed along the Lower Kinabatangan River in eastern Sabah, Bornean Malaysia, during a two-year field study. Eight sexual mounts and two non-sexual mounts in one-male groups were recorded using scan sampling and event sampling. All observed copulations comprised single mounts, with copulatory bouts averaging 25 seconds. The adult female was the solicitor when solicitations were observed with certainty. Sexual harassment by older infants and young juveniles of copulating pairs was also observed. Nasalis larvatus infants were observed almost throughout the study. No correlation could be established between birth dates and environmental parameters, although there appeared to be more births during the wet season. 2015-09-07T01:20:04Z 2018-04-17T14:35:15Z 2015-09-07T01:20:04Z 2018-04-17T14:35:15Z 2015 2011 Article Asian Primates Journal. Vol. 2, No. 1 (2011), 36-41 https://repository.li.mahidol.ac.th/handle/123456789/10541 eng Mahidol University
institution Mahidol University
building Mahidol University Library
continent Asia
country Thailand
Thailand
content_provider Mahidol University Library
collection Mahidol University Institutional Repository
language English
topic Birth seasonality
Mating behavior
Nasalis larvatus
Proboscis monkey
Sexual behavior
Sexual harassment
spellingShingle Birth seasonality
Mating behavior
Nasalis larvatus
Proboscis monkey
Sexual behavior
Sexual harassment
Ramesh Boonratana
Observations on the sexual behavior and birth seasonality of proboscis monkey (Nasalis Larvatus) along the lower Kinabatangan, Northern Borneo
description Sexual behavior of Nasalis larvatus was observed along the Lower Kinabatangan River in eastern Sabah, Bornean Malaysia, during a two-year field study. Eight sexual mounts and two non-sexual mounts in one-male groups were recorded using scan sampling and event sampling. All observed copulations comprised single mounts, with copulatory bouts averaging 25 seconds. The adult female was the solicitor when solicitations were observed with certainty. Sexual harassment by older infants and young juveniles of copulating pairs was also observed. Nasalis larvatus infants were observed almost throughout the study. No correlation could be established between birth dates and environmental parameters, although there appeared to be more births during the wet season.
author2 Mahidol University. Mahidol University International College. Science Division.
author_facet Mahidol University. Mahidol University International College. Science Division.
Ramesh Boonratana
format Article
author Ramesh Boonratana
author_sort Ramesh Boonratana
title Observations on the sexual behavior and birth seasonality of proboscis monkey (Nasalis Larvatus) along the lower Kinabatangan, Northern Borneo
title_short Observations on the sexual behavior and birth seasonality of proboscis monkey (Nasalis Larvatus) along the lower Kinabatangan, Northern Borneo
title_full Observations on the sexual behavior and birth seasonality of proboscis monkey (Nasalis Larvatus) along the lower Kinabatangan, Northern Borneo
title_fullStr Observations on the sexual behavior and birth seasonality of proboscis monkey (Nasalis Larvatus) along the lower Kinabatangan, Northern Borneo
title_full_unstemmed Observations on the sexual behavior and birth seasonality of proboscis monkey (Nasalis Larvatus) along the lower Kinabatangan, Northern Borneo
title_sort observations on the sexual behavior and birth seasonality of proboscis monkey (nasalis larvatus) along the lower kinabatangan, northern borneo
publishDate 2015
url https://repository.li.mahidol.ac.th/handle/123456789/10541
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