Literaturdatenbank
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Duli, N. B. (2009). Morphometric and genetic variability of river terrapin (batagur baska) and painted terrapin (batagur borneoensis). Unpublished thesis , Universiti Sains Malaysia.
Added by: Admin (06 Jan 2014 18:24:21 UTC) |
| Resource type: Thesis/Dissertation BibTeX citation key: anon2009j View all bibliographic details  |
Categories: General Keywords: Batagur baska, Batagur borneoensis, Genetik - genetics, Geoemydidae, Morphologie - morphology, Schildkröten - turtles + tortoises, Systematik - taxonomy Creators: Duli Publisher: Universiti Sains Malaysia |
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| Abstract |
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Information on the population genetic structure is pivotal to the conservation of endangered species. This is the first investigation on the population genetics of the Malaysian freshwater terrapins, Batagur baska and Batagur borneoensis. Sampling was done in the Terengganu, Setiu, Paka, and Cherating Rivers (East coast), and Kedah, Muda, Perak, and Linggi Rivers (West coast), and four hatchery and conservation centres in Linggi, Bota Kanan, Bukit Pinang, and Kuala Berang. Eighty two wild females of B. baska, and thirty seven wild females of B. borneoensis were sampled during the nesting season of 2003 and 2004. Forty two captive females of B. baska and nine captive females of B. borneoensis were sampled in four hatchery and conservation centers. All samples were measured for morphometric analysis and blood was drawn for molecular analysis. The ten morphometric parameters measured were analysed based on analysis of variance (Oneway ANOVA), Principal Component Analysis (PCA), and Discriminant Function Analysis (DFA) using SPSS ver. 11.5 software. Both species showed a trend of separation between the east and the west coast populations, where the east coast turtles were on the average larger than the west coast turtles. Size variation (which is largely influenced by environmental factors) plays a major role in the population differentiation based on their high loadings on PC1. Fifty nine samples were successfully sequence for B. baska and 35 for B. borneoensis for molecular analysis. Phylogenetic analysis conducted on the PAUP software based on NJ and MP methods showed geographic structuring where the east and the west coast populations which is divided by the Banjaran Titiwangsa, were clearly differentiated in B. baska. Thus each region should be managed as separate management unit (MU). There were some signs of admixture of genetic composition in B. borneoensis between east and west coast populations which need further investigation. Six haplotypes were observed in the total B. baska populations, and four haplotypes in B. borneoensis populations based on Arlequin ver.2.0 software. Genetic variability was very low or even non existent within populations and between populations within regions. Some discrepancies were observed but this was believed to be attributable to translocation events. More detailed study of the mtDNA and nDNA of these species is suggested in planning effective conservation management.
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