Sains Malaysiana 52(2)(2023): 369-380

http://doi.org/10.17576/jsm-2023-5202-05

Population Genetic Structure of the Blue Swimming Crab (Portunus pelagicus) along the Andaman Sea Coast of Thailand

(Struktur Genetik Populasi Ketam Renang Biru (Portunus pelagicus) di sepanjang Pantai Laut Andaman, Thailand)

JUTHAMAS SUPPAPAN¹, APIRAK SONGRAK², WORAWITOO MEESOOK³ & VERAKIAT SUPMEE ^3,*

¹Master of Education in Science Program, Faculty of Education, Nakhon Si Thammarat Rajabhat University, Nakhon Si Thammarat, Thailand

²Department of Fishery Technology, Faculty of Science and Fisheries Technology, Rajamangala University of Technology Srivijaya, Trang Campus, Trang, Thailand

³Department of Science, Faculty of Science and Technology, Rajamangala University of Technology Srivijaya, Nakhon Si Thammarat Campus, Nakhon Si Thammarat, Thailand

  Diserahkan: 31 Ogos 2022/Diterima: 11 November 2022

Abstract

The blue swimming crab (Portunus pelagicus) is a valuable commercial species. In Thailand, the consumption of the blue swimming crab is increasing. To construct an effective sustainable management plan, genetic information is required. Knowledge of natural stock genetic information can help policymakers design fishing and conservation management policies to maintain genetic diversity. In our study, we examined the genetic structure of the blue swimming crab population on the Andaman Sea coast of Thailand. Partial sequences of the mitochondrial DNA control region (mtDNA CR) with a size of 369-371 base pairs were studied in 150 individuals collected from five sampling sites along Thailand's Andaman Sea coast. Seventy-one haplotypes were characterized by 127 polymorphic sites, indicating high haplotype diversity but low nucleotide diversity across five localities. The multiple tests of population genetic analysis showed a lack of genetic structure. The absence of genetic structure was possibly caused by a high level of gene flow due to the larval blue swimming crab's high dispersal ability. Demographic history findings indicate that the blue swimming crab population has expanded. The findings of our study can be used to guide the management of the blue swimming crab in this region of the Andaman Sea to conserve genetic diversity.

Keywords: Andaman Sea; genetic diversity; marine crab; mitochondrial DNA

Abstrak

Ketam renang biru (Portunus pelagicus) adalah spesies komersial yang berharga. Di Thailand, pengambilan ketam renang biru semakin meningkat. Untuk membina pelan pengurusan mampan yang berkesan, maklumat genetik diperlukan. Pengetahuan tentang maklumat genetik stok semula jadi boleh membantu penggubal dasar membentuk dasar pengurusan perikanan dan pemuliharaan untuk mengekalkan kepelbagaian genetik. Dalam penyelidikan ini, kami mengkaji struktur genetik populasi ketam renang biru di pantai Laut Andaman, Thailand. Jujukan separa kawasan kawalan DNA mitokondria (mtDNA CR) dengan saiz 369-371 pasangan asas telah dikaji dalam 150 individu yang dikumpulkan dari lima tapak persampelan di sepanjang pantai Laut Andaman, Thailand. Tujuh puluh satu haplotip dicirikan oleh 127 tapak polimorfik, menunjukkan kepelbagaian haplotaip yang tinggi tetapi kepelbagaian nukleotida rendah merentas lima lokaliti. Pelbagai ujian analisis genetik populasi mendedahkan kekurangan struktur genetik. Ketiadaan struktur genetik mungkin disebabkan oleh tahap aliran gen yang tinggi disebabkan oleh keupayaan penyebaran tinggi ketam renang biru larva. Penemuan sejarah demografi menunjukkan bahawa populasi ketam renang biru telah berkembang. Penemuan kajian kami boleh digunakan sebagai bimbingan pengurusan ketam renang biru di wilayah Laut Andaman ini untuk memulihara kepelbagaian genetik.

Kata kunci: DNA mitokondria; kepelbagaian genetik; ketam marin; Laut Andaman

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