Morphological variation of mountain blackeye (Chlorocharis emiliae) populations in Malaysian Borneo

The mountain blackeye (Chlorocharis emiliae) is one of the few Bornean endemic birds which presents an excellent model species to illustrate evolution and speciation. Here, we use discriminant function analysis to elucidate the morphological variation on 40 specimens of mountain blackeye from four...

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Main Authors:	Ramji, M.F.S, Rahman, M.A, Tuen, A.A.
Format:	Article
Language:	English
Published:	Penerbit Universiti Kebangsaan Malaysia 2012
Online Access:	http://journalarticle.ukm.my/7402/ http://journalarticle.ukm.my/7402/ http://journalarticle.ukm.my/7402/1/41_1_1.pdf

id	ukm-7402
recordtype	eprints
spelling	ukm-74022016-12-14T06:43:58Z http://journalarticle.ukm.my/7402/ Morphological variation of mountain blackeye (Chlorocharis emiliae) populations in Malaysian Borneo Ramji, M.F.S Rahman, M.A Tuen, A.A. The mountain blackeye (Chlorocharis emiliae) is one of the few Bornean endemic birds which presents an excellent model species to illustrate evolution and speciation. Here, we use discriminant function analysis to elucidate the morphological variation on 40 specimens of mountain blackeye from four populations namely Mount Kinabalu, Mount Trus Madi, Mount Murud and Mount Mulu. The test successfully distinguished all four populations accordingly by respective nominated subspecies. Tarsus length and bill length were identified as the best predictors from nine character loadings observed which also included bill depth, bill width, head bill, wing length, wing span, tail length and total length. Along with this, the morphological patterns also revealed that solid skeletal characters such as bill length, bill depth, bill width and tarsus are genuine predictors of morphological variation and body size within species as compared to feather-based characters. The evolution of such morphological traits is more pronounced due to different ecological adaptation of the mountain blackeye populations. Several factors such as phenotypic plasticity, foraging behaviours and food availability may have influenced the morphological variation between the subspecies. Penerbit Universiti Kebangsaan Malaysia 2012-06 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/7402/1/41_1_1.pdf Ramji, M.F.S and Rahman, M.A and Tuen, A.A. (2012) Morphological variation of mountain blackeye (Chlorocharis emiliae) populations in Malaysian Borneo. Malaysian Applied Biology, 41 (1). pp. 1-10. ISSN 0126-8643 http://mabjournal.com/
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
language	English
description	The mountain blackeye (Chlorocharis emiliae) is one of the few Bornean endemic birds which presents an excellent model species to illustrate evolution and speciation. Here, we use discriminant function analysis to elucidate the morphological variation on 40 specimens of mountain blackeye from four populations namely Mount Kinabalu, Mount Trus Madi, Mount Murud and Mount Mulu. The test successfully distinguished all four populations accordingly by respective nominated subspecies. Tarsus length and bill length were identified as the best predictors from nine character loadings observed which also included bill depth, bill width, head bill, wing length, wing span, tail length and total length. Along with this, the morphological patterns also revealed that solid skeletal characters such as bill length, bill depth, bill width and tarsus are genuine predictors of morphological variation and body size within species as compared to feather-based characters. The evolution of such morphological traits is more pronounced due to different ecological adaptation of the mountain blackeye populations. Several factors such as phenotypic plasticity, foraging behaviours and food availability may have influenced the morphological variation between the subspecies.
format	Article
author	Ramji, M.F.S Rahman, M.A Tuen, A.A.
spellingShingle	Ramji, M.F.S Rahman, M.A Tuen, A.A. Morphological variation of mountain blackeye (Chlorocharis emiliae) populations in Malaysian Borneo
author_facet	Ramji, M.F.S Rahman, M.A Tuen, A.A.
author_sort	Ramji, M.F.S
title	Morphological variation of mountain blackeye (Chlorocharis emiliae) populations in Malaysian Borneo
title_short	Morphological variation of mountain blackeye (Chlorocharis emiliae) populations in Malaysian Borneo
title_full	Morphological variation of mountain blackeye (Chlorocharis emiliae) populations in Malaysian Borneo
title_fullStr	Morphological variation of mountain blackeye (Chlorocharis emiliae) populations in Malaysian Borneo
title_full_unstemmed	Morphological variation of mountain blackeye (Chlorocharis emiliae) populations in Malaysian Borneo
title_sort	morphological variation of mountain blackeye (chlorocharis emiliae) populations in malaysian borneo
publisher	Penerbit Universiti Kebangsaan Malaysia
publishDate	2012
url	http://journalarticle.ukm.my/7402/ http://journalarticle.ukm.my/7402/ http://journalarticle.ukm.my/7402/1/41_1_1.pdf
first_indexed	2023-09-18T19:49:36Z
last_indexed	2023-09-18T19:49:36Z
_version_	1777406130169839616

Morphological variation of mountain blackeye (Chlorocharis emiliae) populations in Malaysian Borneo

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