Population Genetic Structure of Pantropical Spotted Dolphin, Stenella attenuata, in Waters of Taiwan and South China Sea Based on Mitochondrial DNA Control Region Sequences
Resource
Taiwania,49(二)
Journal
Taiwania
Journal Volume
49
Journal Issue
二
Pages
-
Date Issued
2004
Date
2004
Author(s)
DOI
246246/2006121215550995
Abstract
A total of 447 base pairs of the mitochondrial DNA control region from 34 pantropical
spotted dolphins, Stenella attenuata, in the waters of Taiwan and South China Sea were sequenced and
analyzed. In this study, we tested the null hypothesis of non-differentiation genetic structure of the
spotted dolphin of Taiwanese and adjacent waters. There were three putative populations in this study
－Taiwan Strait, eastern Taiwan and South China Sea. The genetic structure and population
differentiation of the putative populations were estimated to clarify the population status. There were
14 variable sites within the sequences and 13 haplotypes defined. Among the haplotypes, nine were
unique and four were shared. The South China Sea population had three haplotypes, all of these were
unique. The haplotype diversity estimates of the three populations range from 0.8883 in South China
Sea, followed by 0.8182 in Taiwan Strait and 0.7778 in eastern Taiwan. Nucleotide diversity estimates
range from 0.0096 in eastern Taiwan, 0.0078 in South China Sea and 0.0049 in Taiwan Strait. The
Minimum-spanning network does not describe a clear pattern of haplotype and geographical locale
relationship. Neighbor-joining and Maximum Likelihood phylogenetic analyses with Stenella
longiroatris as outgroup also could not divide the haplotypes into clades representing the three
putative populations. The Analysis of Molecular Variance (AMOVA) results show two patterns of
population differentiation. The analysis using haplotype frequency, Fst, indicates significant
population subdivision between South China Sea and Taiwan Strait (Fst = 0.1761, p = 0.0156), and
between South China Sea and eastern Taiwan populations (Fst = 0.2029, p = 0.0059). However, the
analysis using genetic distance and frequency information, Φst, does not reveal significant population
differentiation between any pair of comparisons. Additionally, the relatively lower genetic diversity
estimates of pantropical spotted dolphins in Taiwanese waters suggest that future monitoring is needed.
A more systematic collecting method and expanding sampling area should be carried out for future
investigations.
Subjects
Mitochondrial DNA
Taiwan
South China Sea
Stenella attenuata
Population structure
Publisher
臺北市：生態學與演化生物學研究所
Type
other
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