Mitochondrial DNA diversity of Tor douronensis Valenciennes (Cyprinidae) in Malaysian Borneo

Siti Khalijah Daud, . and Siti Shapor Siraj, . and Mohd Tajuddin Abdullah, . and Jeffrine Rovie Ryan Japning, . and Yuzine Esa, . and Tan Soon Guan, . and Khairul Adha A. Rahim, . Mitochondrial DNA diversity of Tor douronensis Valenciennes (Cyprinidae) in Malaysian Borneo. pp. 47-55. ISSN 1511-3701

This study examines the population structure and taxonomy of Tor Douronensis an important indigenous freshwater fish species in Malaysian Borneo by using sequence analysis of 466 base pairs of the mitochondrial cytochrome c oxidase I (COI) gene. A total of 62 fish samples were collected from five locations in Sarawak (N54) and Sabah (N8). The phylogenetic analysis using the Neighbour-Joining (NJ) method supported the monophyletic status between T . douronensi s and To r tambroides which further reinforced their taxonomic status as distinct species. The T . douronensis haplotypes were further divided into three major groups with the Pelian fish from Sabah forming its own group (Cluster III) with strong bootstrap support. The large genetic differences separating the Sabah haplotypes from its Sarawak congeners suggested that the Pelian fish might represent a cryptic species. The current study showed high levels of intra and inter-population variations in T. douronensis. Within all population variations T . douronensis populations were found except in Bario. The presence of fixed haplotype differences along with high F ST values among the populations of T. douronensis support the conclusion that little or no migration occurred among the extant populations separated by large geographic distances or river systems. However the sharing of haplotypes between some such populations for example between Batang Ai and Bario (HS6) and between Batang Ai and Ulu Limbang/Ba Kelalan (HS2) provided support that T . douronensis had a historically widespread natural distribution in the region probably during the Quaternary period. Overall the present study was able to shed light on the taxonomy and population structure of T.douronensis in Malaysian Borneo

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Abstract

This study examines the population structure and taxonomy of Tor Douronensis an important indigenous freshwater fish species in Malaysian Borneo by using sequence analysis of 466 base pairs of the mitochondrial cytochrome c oxidase I (COI) gene. A total of 62 fish samples were collected from five locations in Sarawak (N54) and Sabah (N8). The phylogenetic analysis using the Neighbour-Joining (NJ) method supported the monophyletic status between T . douronensi s and To r tambroides which further reinforced their taxonomic status as distinct species. The T . douronensis haplotypes were further divided into three major groups with the Pelian fish from Sabah forming its own group (Cluster III) with strong bootstrap support. The large genetic differences separating the Sabah haplotypes from its Sarawak congeners suggested that the Pelian fish might represent a cryptic species. The current study showed high levels of intra and inter-population variations in T. douronensis. Within all population variations T . douronensis populations were found except in Bario. The presence of fixed haplotype differences along with high F ST values among the populations of T. douronensis support the conclusion that little or no migration occurred among the extant populations separated by large geographic distances or river systems. However the sharing of haplotypes between some such populations for example between Batang Ai and Bario (HS6) and between Batang Ai and Ulu Limbang/Ba Kelalan (HS2) provided support that T . douronensis had a historically widespread natural distribution in the region probably during the Quaternary period. Overall the present study was able to shed light on the taxonomy and population structure of T.douronensis in Malaysian Borneo

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Item Type:	Article
AGROVOC Term:	Mitochondrial genetics
AGROVOC Term:	DNA
AGROVOC Term:	Genetic diversity as resource
AGROVOC Term:	Freshwater fishes
AGROVOC Term:	Taxonomy
AGROVOC Term:	Cyprinidae
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	26 Apr 2025 02:57
URI:	http://webagris.upm.edu.my/id/eprint/21197

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