Dr. Kazi Ahsan Habib

Dr. Kazi Ahsan Habib  |Clyto Access

SAU, Bangladesh

Organizing Committee Member

Expertise: Biodiversity study, DNA taxonomy, Population and phylogenetics, Molecular evolution and conservation biology of marine organisms

Biography: Prof. Dr. Kazi Ahsan Habib has been working as a Faculty in the Department of Fisheries, Sher-e-Bangla Agricultural University (SAU), Bangladesh since 2002. Currently He is serving as the chairman of this department. He has received PhD in Marine Biology in 2011 from Korea Institute of Ocean Science and Technology (KIOST) campus of University of Science and Technology (UST), South Korea. His research interests include biodiversity study, DNA taxonomy, population and phylogenetics, molecular evolution and conservation biology of marine organisms. He already has completed several national and international research projects. One of his current research projects focus on the distribution, diversity, DNA barcoding and conservation of brackish water and marine fauna of the Sundarbans mangrove forest, a UNESCO world heritage site of Bangladesh funded by Yeosu Foundation of the Korean government. His another research is biodiversity study, molecular identification and DNA taxonomy of the coral associated organisms with their conservation of the St. Martin’s Island, the only coral island of Bangladesh. He is also working on the elasmobranch biodiversity of the Bay of Bengal and comparing their genetic structure with the populations of other seas. Dr. Habib attended different national and international conference and symposiums both at home and abroad. He is also involved with different professional societies including Bangladesh Fisheries Research Forum (BFRF), Bangladeshi Barcode of Life network (BDBOLn), Bangladesh Oceanography Society (BOS) and Save Our Sea (SOS), Bay of Bengal.

Presentation:

Title: Genetic diversity and population structure of mud crab Scylla olivacea in the Bay-of-Bengal and West Pacific

Abstract:

Mud crabs (Scylla sp.) are widely distributed in estuarine environments between the lower intertidal zone and offshore such as mangrove forest and creeks throughout Indo-Pacific region. The mud crab species Scylla olivacea is the commercially most important crab in Sundarbans mangrove ecosystem of Bangladesh due to high demand and price in the international market. Genetic diversity and population genetic structure Scylla olivacea population of Sundarbans mangrove forest stretched to the north Bay-of-Bangal coast were assessed and compared to other two populations of the west Pacific i.e. Malacca strait and South China Sea. Sequence variation in the mitochondrial COI gene of 26 mud crab individuals of the Sundarbans forest, and 78 individuals of the West coast (Malacca strait) and 13 individuals of the East coast (South China Sea) of Malaysia were examined. A total of 62 haplotypes were identified. Nine haplotypes were shared at least by any of the two populations. For all the populations, nucleotide diversities were low (0.009 - 0.01) while the haplotype diversities were as high as 0.94 to 0.96, indicating that the species has undergone a recent population expansion after experiencing bottleneck. Star-shaped patterns of haplotype networks as well as the neutrality test by assessing the Tajima’s D and Fu’s Fs values corroborate the recent population expansion. Mismatch distribution analysis reveals that the demographic expansion of the species started during the Early Pleistocene ice age approximately 1.37 million years ago. The pairwise population statistics (FST), and the exact test of haplotype differentiation demonstrate significant genetic differentiation only between the Sundarbans and the Malacca strait populations, suggesting that S. olivacea is not panmictic in the studied area. Two distinct phylogenetic lineages were recognized in the studied area.

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