Preliminary Morphometric Analysis of Aethalops aequalis Populations in Sabah and Sarawak, Malaysian Borneo

Aethalops aequalis was previously recorded as a subspecies of A. alecto in Borneo. They are difficult to distinguish by external morphology as Malaysian Aethalops species are similar in size. The objective of this study was to characterize the morphological differences within the Malaysian A. aequal...

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Main Authors:	R.C.T , Tingga, Abdullah, M.T
Format:	Article
Language:	English
Published:	Chulalongkorn University 2012
Subjects:	QL Zoology S Agriculture (General)
Online Access:	http://ir.unimas.my/732/ http://ir.unimas.my/732/1/Preliminary%20Morphometric%20Analysis%20of%20Aethalops%20aequalis%20%28abstract%29.pdf

id	unimas-732
recordtype	eprints
spelling	unimas-7322015-09-14T00:16:14Z http://ir.unimas.my/732/ Preliminary Morphometric Analysis of Aethalops aequalis Populations in Sabah and Sarawak, Malaysian Borneo R.C.T , Tingga Abdullah, M.T QL Zoology S Agriculture (General) Aethalops aequalis was previously recorded as a subspecies of A. alecto in Borneo. They are difficult to distinguish by external morphology as Malaysian Aethalops species are similar in size. The objective of this study was to characterize the morphological differences within the Malaysian A. aequalis populations based upon the evaluation of seven selected populations in Borneo. To this end, 11 skull and 11 dental characters were examined and analyzed using SPSS software. Six of these characters were found to be polymorphic across populations, with CM1 being the strongest character in most of the extracted functions followed by IM1, both of which are dental characters that relate to the lower jaw length. Character CM1 was generally shorter in most of the Southwest Sarawak populations compared to the Northeast Sarawak and Sabah populations. Aethalops aequalis from Sabah and Sarawak possessed a single skull morphotype and mountain isolation is, or has not yet been a sufficient barrier to lead to morphological divergence. The body and skull sizes were not affected by altitude or elevations, with A. aequalis possessing a single morphotype in Malaysian Borneo. In conclusion, little morphological variation was detected within and among the different geographical populations of A. aequalis in Sabah and Sarawak. The few differences found are likely to have arisen via natural selection driven adaptation to the new environment. KEY WORDS: Morphometric, Aethalops aequalis, Malaysian Borneo, skull, dental, single morphotype Chulalongkorn University 2012-04 Article PeerReviewed text en http://ir.unimas.my/732/1/Preliminary%20Morphometric%20Analysis%20of%20Aethalops%20aequalis%20%28abstract%29.pdf R.C.T , Tingga and Abdullah, M.T (2012) Preliminary Morphometric Analysis of Aethalops aequalis Populations in Sabah and Sarawak, Malaysian Borneo. Tropical Natural History, 12 (1). pp. 29-41.
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Sarawak
building	UNIMAS Institutional Repository
collection	Online Access
language	English
topic	QL Zoology S Agriculture (General)
spellingShingle	QL Zoology S Agriculture (General) R.C.T , Tingga Abdullah, M.T Preliminary Morphometric Analysis of Aethalops aequalis Populations in Sabah and Sarawak, Malaysian Borneo
description	Aethalops aequalis was previously recorded as a subspecies of A. alecto in Borneo. They are difficult to distinguish by external morphology as Malaysian Aethalops species are similar in size. The objective of this study was to characterize the morphological differences within the Malaysian A. aequalis populations based upon the evaluation of seven selected populations in Borneo. To this end, 11 skull and 11 dental characters were examined and analyzed using SPSS software. Six of these characters were found to be polymorphic across populations, with CM1 being the strongest character in most of the extracted functions followed by IM1, both of which are dental characters that relate to the lower jaw length. Character CM1 was generally shorter in most of the Southwest Sarawak populations compared to the Northeast Sarawak and Sabah populations. Aethalops aequalis from Sabah and Sarawak possessed a single skull morphotype and mountain isolation is, or has not yet been a sufficient barrier to lead to morphological divergence. The body and skull sizes were not affected by altitude or elevations, with A. aequalis possessing a single morphotype in Malaysian Borneo. In conclusion, little morphological variation was detected within and among the different geographical populations of A. aequalis in Sabah and Sarawak. The few differences found are likely to have arisen via natural selection driven adaptation to the new environment. KEY WORDS: Morphometric, Aethalops aequalis, Malaysian Borneo, skull, dental, single morphotype
format	Article
author	R.C.T , Tingga Abdullah, M.T
author_facet	R.C.T , Tingga Abdullah, M.T
author_sort	R.C.T , Tingga
title	Preliminary Morphometric Analysis of Aethalops aequalis Populations in Sabah and Sarawak, Malaysian Borneo
title_short	Preliminary Morphometric Analysis of Aethalops aequalis Populations in Sabah and Sarawak, Malaysian Borneo
title_full	Preliminary Morphometric Analysis of Aethalops aequalis Populations in Sabah and Sarawak, Malaysian Borneo
title_fullStr	Preliminary Morphometric Analysis of Aethalops aequalis Populations in Sabah and Sarawak, Malaysian Borneo
title_full_unstemmed	Preliminary Morphometric Analysis of Aethalops aequalis Populations in Sabah and Sarawak, Malaysian Borneo
title_sort	preliminary morphometric analysis of aethalops aequalis populations in sabah and sarawak, malaysian borneo
publisher	Chulalongkorn University
publishDate	2012
url	http://ir.unimas.my/732/ http://ir.unimas.my/732/1/Preliminary%20Morphometric%20Analysis%20of%20Aethalops%20aequalis%20%28abstract%29.pdf
first_indexed	2018-09-06T14:38:32Z
last_indexed	2018-09-06T14:38:32Z
_version_	1610869335874600960

Preliminary Morphometric Analysis of Aethalops aequalis Populations in Sabah and Sarawak, Malaysian Borneo

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