Population genetic structure of molluscs in China based on DNA markers and a preliminary biophysical model

Name: Yingying Ye

keyword: Molluscs

; Popolation Structure

Abstract: Population genetic structure for three marine mollusc species (i.e., Meretrix meretrix, Macridiscus multifarious and Perna viridis) from China was examined using mitochondrial and microsatellite DNA data. Collectively, population genetic structure data of these three species suggested at least three genetic management units along the coastline of China. These units include (1) Yellow Sea population (suggested by M. meretrix results), (2) South China Sea population (suggested by M. meretrix, P. veridis results) and (3) East China Sea population (suggested by Ma. multifarious results). Microsatellite genetics data for M. meretrix revealed population homogeneity within Yellow Sea and some substructuring within South China Sea. On the other hand, both conventional and model-based population genetic analyses suggested significant genetic divergence between Yellow Sea and South China Sea regions. For Ma. multifarious, results from mitochondrial DNA data suggested clear East-South China Sea division. For P. veridis, low level and insignificant of genetic divergence was observed among samples in South China Sea based on both microsatellite and mitochondrial DNA data. Within South China Sea, species with short pelagic larval duration (PLD), M. meretrix and Ma. Multifarious, had stronger population genetic structure than one with long PLD (P. viridis). Management actions should aim to protect the integrity of the three management units. Compared to P. viridis, effective population size (Ne) estimates, based on linkage disequilibrium among microsatellite loci, were extremely low for M. meretrix populations. This finding indicates urgent need for a management action that would increase Ne for M. meretrix. This study developed the first biophysical model for estimating larval dispersal for species with pelagic larvae for South China Sea. The model integrates an oceanographic model specific to summer current in the South China Sea region and some life history traits for P. veridis, a species with a long PLD (21-28 days). Although the model gave a partially accurate prediction for population connectivity among locations in the open area, it partially disagreed with empirical genetics data in Beibu Gulf (Beihai, BH). The disagreement can be due to some model parameter settings. In this study, microsatellite loci had the highest-resolution for population genetics study. Mitochondrial DNA COI sequences are also informative. However, 16S rRNA, 12S rRNA and ND1 markers could not reveal genetic differences among samples, largely because they are in conserved regions of the mitochondrial genome.

Burapha University. Library

Address: CHONBURI

Email: buulibrary@buu.ac.th

Name: Wansuk Senanan

Role: Principal advisor

Created: 2015

Modified: 2565-07-25

Issued: 2016-05-24

วิทยานิพนธ์/Thesis

application/pdf

eng

DegreeName: Doctor of Science

Level: Doctoral Degree

Descipline: Aquatic Science

Grantor: Burapha University

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