Population Genetics Of The Striped Snakehead, Channa Striata (Bloch, 1793) In Malaysia
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Date
2011-07
Authors
Tan, Min Pau
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
This research was aimed at the development of novel microsatellite markers for
C. striata, characterization of genetic diversity, population structure and phylogenetic
relationships among wild populations inferred from mitochondrial DNA and newly
derived microsatellite DNA markers. It also involved the investigation on the
phylogeography aspects that had influenced current genetic distribution at macro as well
as micro scale levels.. A recommendation on the management strategies (stock
enhancement and conservation) and the potential candidates for broodstock selection
was put forth. Mitochondrial and genotypic data consistently revealed moderate genetic
diversity among all the wild C. striata populations though a wide range of variation was
observed. In general, this suggested independent evolutionary history for each
population studied. High genetic structuring among populations was typical of
freshwater species with limited dispersal ability. However, mild gene flow could
occurred between adjacent populations. Three distinct genetic lineages were apparent
which discriminated the northwest Peninsular Malaysia, southeast Peninsular Malaysia
and Malaysian Borneo from each other. However, an ancient anthropogenic stock
translocation from Peninsular Malaysia to Malaysian Borneo was detected as inferred
from both mitochondrial and microsatellite DNA data. Furthermore, haplotype sharing
between the east Peninsular Malaysia and Sumatra populations revealed extraordinary
migration ability of C. striata (>500km). Fine scale study in Perak revealed upstream
refugia found at three different river systems but they were not differentiated from each
other.
Description
Keywords
Striped Snakehead , Channa Striata (Bloch, 1793)