Genetic Structure and Diversity of the Yellowbelly Threadfin Bream <i>Nemipterus bathybius</i> in the Northern South China Sea

The genetic structure and demography of the yellowbelly threadfin bream, <i>Nemipterus bathybius</i>, in the northern South China Sea were examined using the mitochondrial DNA cytochrome b gene (1141 bp). High levels of haplotype and nucleotide diversities (0.98 and 5.26 × 10<sup>−...

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Main Authors: Mu-Rong Yi, Kui-Ching Hsu, Jin-Xi Wang, Bo Feng, Hung-Du Lin, Yun-Rong Yan
Format: Article
Language:English
Published: MDPI AG 2021-07-01
Series:Diversity
Subjects:
Online Access:https://www.mdpi.com/1424-2818/13/7/324
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spelling doaj-9001abef284f4ee0a191bf3a1eb8418f2021-07-23T13:37:38ZengMDPI AGDiversity1424-28182021-07-011332432410.3390/d13070324Genetic Structure and Diversity of the Yellowbelly Threadfin Bream <i>Nemipterus bathybius</i> in the Northern South China SeaMu-Rong Yi0Kui-Ching Hsu1Jin-Xi Wang2Bo Feng3Hung-Du Lin4Yun-Rong Yan5College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, ChinaCollege of Fisheries, Guangdong Ocean University, Zhanjiang 524088, ChinaCollege of Fisheries, Guangdong Ocean University, Zhanjiang 524088, ChinaCollege of Fisheries, Guangdong Ocean University, Zhanjiang 524088, ChinaThe Affiliated School of National Tainan First Senior High School, Tainan 701, TaiwanCollege of Fisheries, Guangdong Ocean University, Zhanjiang 524088, ChinaThe genetic structure and demography of the yellowbelly threadfin bream, <i>Nemipterus bathybius</i>, in the northern South China Sea were examined using the mitochondrial DNA cytochrome b gene (1141 bp). High levels of haplotype and nucleotide diversities (0.98 and 5.26 × 10<sup>−3</sup>, respectively) showed that all populations exhibited a high level of genetic diversity. Analysis of molecular variance (AMOVA), <i>F</i><sub>ST</sub> statistics, and haplotype networks suggested the absence of significant genetic differentiation along the coast of the northern South China Sea. Although the results suggested that the lack of differentiation within the population structure of <i>N. bathybius</i> was shaped by ocean currents, our results also showed that the Qiongzhou Strait limited their migration between Beibu Gulf and the northern South China Sea. Neutrality tests and mismatch distributions indicated population expansion, but the Bayesian skyline plots and approximate Bayesian computation approaches suggested that the population sizes recently contracted. The diversification of multiple stocks, which were induced by two ocean current systems, contributed to these discordant results. Although these analyses of demographic history revealed no evidence for recent population bottlenecks, the population demography needs to be evaluated further.https://www.mdpi.com/1424-2818/13/7/324mitochondriaocean currentsqiongzhou straitdemographymultiple stocks
collection DOAJ
language English
format Article
sources DOAJ
author Mu-Rong Yi
Kui-Ching Hsu
Jin-Xi Wang
Bo Feng
Hung-Du Lin
Yun-Rong Yan
spellingShingle Mu-Rong Yi
Kui-Ching Hsu
Jin-Xi Wang
Bo Feng
Hung-Du Lin
Yun-Rong Yan
Genetic Structure and Diversity of the Yellowbelly Threadfin Bream <i>Nemipterus bathybius</i> in the Northern South China Sea
Diversity
mitochondria
ocean currents
qiongzhou strait
demography
multiple stocks
author_facet Mu-Rong Yi
Kui-Ching Hsu
Jin-Xi Wang
Bo Feng
Hung-Du Lin
Yun-Rong Yan
author_sort Mu-Rong Yi
title Genetic Structure and Diversity of the Yellowbelly Threadfin Bream <i>Nemipterus bathybius</i> in the Northern South China Sea
title_short Genetic Structure and Diversity of the Yellowbelly Threadfin Bream <i>Nemipterus bathybius</i> in the Northern South China Sea
title_full Genetic Structure and Diversity of the Yellowbelly Threadfin Bream <i>Nemipterus bathybius</i> in the Northern South China Sea
title_fullStr Genetic Structure and Diversity of the Yellowbelly Threadfin Bream <i>Nemipterus bathybius</i> in the Northern South China Sea
title_full_unstemmed Genetic Structure and Diversity of the Yellowbelly Threadfin Bream <i>Nemipterus bathybius</i> in the Northern South China Sea
title_sort genetic structure and diversity of the yellowbelly threadfin bream <i>nemipterus bathybius</i> in the northern south china sea
publisher MDPI AG
series Diversity
issn 1424-2818
publishDate 2021-07-01
description The genetic structure and demography of the yellowbelly threadfin bream, <i>Nemipterus bathybius</i>, in the northern South China Sea were examined using the mitochondrial DNA cytochrome b gene (1141 bp). High levels of haplotype and nucleotide diversities (0.98 and 5.26 × 10<sup>−3</sup>, respectively) showed that all populations exhibited a high level of genetic diversity. Analysis of molecular variance (AMOVA), <i>F</i><sub>ST</sub> statistics, and haplotype networks suggested the absence of significant genetic differentiation along the coast of the northern South China Sea. Although the results suggested that the lack of differentiation within the population structure of <i>N. bathybius</i> was shaped by ocean currents, our results also showed that the Qiongzhou Strait limited their migration between Beibu Gulf and the northern South China Sea. Neutrality tests and mismatch distributions indicated population expansion, but the Bayesian skyline plots and approximate Bayesian computation approaches suggested that the population sizes recently contracted. The diversification of multiple stocks, which were induced by two ocean current systems, contributed to these discordant results. Although these analyses of demographic history revealed no evidence for recent population bottlenecks, the population demography needs to be evaluated further.
topic mitochondria
ocean currents
qiongzhou strait
demography
multiple stocks
url https://www.mdpi.com/1424-2818/13/7/324
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