TY  - THES
T1  - Molecular Phylogenetics and Population Structure of two Mahseer Species (Tor Tambroides Bleeker and Tor Douronensis Valenciennes: Cyprinidae) in Malaysia
A1  - Esa, Yuzine
LA  - English
LA  - English
YR  - 2009
UL  - http://discoverylib.upm.edu.my/discovery/Record/oai:psasir.upm.edu.my:10712
AB  - This study examines the phylogenetic relationships of mahseer (genus Tor and
Neolisssochillus) and their relationships with other selected cyprinids using sequence
analysis of mitochondrial DNA cytochrome c oxidase I (COI) gene (464 base pairs). This
study also describes the genetic structure of Tor tambroides and Tor douronensis, two
important mahseer in Malaysia using both mitochondrial COI sequences and nuclear
microsatellites DNA.
The findings of the phylogenetic study strongly support the reciprocally monophyletic status
between genus Tor (T. douronensis and T. tambroides) and genus Neolissochillus
(represented by Neolissochillus stracheyi.) thus, strengthen the taxonomic status for all the
three indigenous mahseer. For the other indigenous cyprinids, an interesting finding was that Barbonymus gonionotus was phylogenetically distinct from its morphologically similar
species, Barbonymus schwanenfeldii (K2P distance value = 15.1%), and did not group
together in a single Barbonymus clade.
The population structure analysis inferred from mitochondrial COI sequences found high
levels of intra and inter-population variations in T. douronensis. The presence of fixed
haplotype differences among the populations, along with high FST values indicated that there
has been little or no migration occur among the extant populations separated by large
geographic distances, or river systems. For T. tambroides, low level of mitochondrial
variations was found among the populations. The reason is probably due to the high
proportion of the HKE1 haplotype found in most populations (0.736-1.000) studied except
from Endau-Rompin (HKE4 is the dominant haplotype), or by the small number of samples
used in the present study.
KW  - Phylogeny - Molecular aspects
KW  - Molecular genetics
KW  - Cypridinidae - Classification
ER  -