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Population genetic structures of Eleutheronema tetradactylum (Shaw, 1804) and Eleutheronema rhadinum (Jordan and Evermann, 1902) in Malaysian waters

The four finger threadfin, Eleutheronema tetradactylum (Shaw, 1804) and East Asian four finger threadfin, Eleutheronema rhadinum (Jordan and Everman, 1902) are two species of the Polynemidae family that can be found in Malaysian waters. Common name among local is Senangin. There have been no popu...

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Main Author: Wahid, Nurul Atikah
Format: Thesis
Language:English
Published: 2019
Subjects:
Fishes - Genetics
Polynemidae
Online Access:http://psasir.upm.edu.my/id/eprint/99175/1/FP%202020%2043%20IR.pdf
http://psasir.upm.edu.my/id/eprint/99175/
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spelling my.upm.eprints.991752023-03-06T04:24:33Z http://psasir.upm.edu.my/id/eprint/99175/ Population genetic structures of Eleutheronema tetradactylum (Shaw, 1804) and Eleutheronema rhadinum (Jordan and Evermann, 1902) in Malaysian waters Wahid, Nurul Atikah The four finger threadfin, Eleutheronema tetradactylum (Shaw, 1804) and East Asian four finger threadfin, Eleutheronema rhadinum (Jordan and Everman, 1902) are two species of the Polynemidae family that can be found in Malaysian waters. Common name among local is Senangin. There have been no population genetic studies in both species in Malaysia, which are important to provide genetic information for sustainable fisheries management of the two species. Moreover, both Senangin species are also difficult to distinguish morphologically, thus their taxonomic classification are not fully resolved. Therefore, the aims for this study were to determine the levels of genetic divergences between the two Senangin fishes, and to quantify their population genetic structure by using both mitochondrial DNA and microsatellite markers. Totally 151 samples of Senangin were collected from six location around Malaysian coastal water. Samples were obtained from commercial fishing activities. Among 151 individuals, 20 distinct haplotypes were defined. The phylogenetic tree (maximum likelihood) showed two genealogical branches were recognized among the haplotype, this also proven in pairwise distance among the haplotypes. Level of genetic divergence was substantially high (15-17%) supported their taxonomic status as distinct species. The nucleotide diversity was low in E. tetradactylum and E. rhadinum. Both species show the sharing of haplotypes between different populations and this support that both species had a historically widespread natural distribution in the region in the past. Microsatellites analyses for E. tetradactylum also indicated low levels of genetic variation and high degree of population structure among the E. tetradactylum populations. The average observed heterozygosity (HO = 0.5191) obtained was lower than the standard heterozygosity found in most marine populations (HO = 0.79). Through assignment test all samples were assigned to their respective populations. The low genetic variation in both of mitochondrial DNA and microsatellite proved the evidence of over-exploitation of E. tetradactylum in Malaysia. In conclusion, the present study was able to differentiate between E. tetradactylum and E. rhadinum using mitochondrial gene, Cytochrome Oxidase I. The levels of genetic differentiation and population structure between the two species were successfully quantified. 2019-11 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/99175/1/FP%202020%2043%20IR.pdf Wahid, Nurul Atikah (2019) Population genetic structures of Eleutheronema tetradactylum (Shaw, 1804) and Eleutheronema rhadinum (Jordan and Evermann, 1902) in Malaysian waters. Masters thesis, Universiti Putra Malaysia. Fishes - Genetics Polynemidae
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
topic Fishes - Genetics
Polynemidae
spellingShingle Fishes - Genetics
Polynemidae
Wahid, Nurul Atikah
Population genetic structures of Eleutheronema tetradactylum (Shaw, 1804) and Eleutheronema rhadinum (Jordan and Evermann, 1902) in Malaysian waters
description The four finger threadfin, Eleutheronema tetradactylum (Shaw, 1804) and East Asian four finger threadfin, Eleutheronema rhadinum (Jordan and Everman, 1902) are two species of the Polynemidae family that can be found in Malaysian waters. Common name among local is Senangin. There have been no population genetic studies in both species in Malaysia, which are important to provide genetic information for sustainable fisheries management of the two species. Moreover, both Senangin species are also difficult to distinguish morphologically, thus their taxonomic classification are not fully resolved. Therefore, the aims for this study were to determine the levels of genetic divergences between the two Senangin fishes, and to quantify their population genetic structure by using both mitochondrial DNA and microsatellite markers. Totally 151 samples of Senangin were collected from six location around Malaysian coastal water. Samples were obtained from commercial fishing activities. Among 151 individuals, 20 distinct haplotypes were defined. The phylogenetic tree (maximum likelihood) showed two genealogical branches were recognized among the haplotype, this also proven in pairwise distance among the haplotypes. Level of genetic divergence was substantially high (15-17%) supported their taxonomic status as distinct species. The nucleotide diversity was low in E. tetradactylum and E. rhadinum. Both species show the sharing of haplotypes between different populations and this support that both species had a historically widespread natural distribution in the region in the past. Microsatellites analyses for E. tetradactylum also indicated low levels of genetic variation and high degree of population structure among the E. tetradactylum populations. The average observed heterozygosity (HO = 0.5191) obtained was lower than the standard heterozygosity found in most marine populations (HO = 0.79). Through assignment test all samples were assigned to their respective populations. The low genetic variation in both of mitochondrial DNA and microsatellite proved the evidence of over-exploitation of E. tetradactylum in Malaysia. In conclusion, the present study was able to differentiate between E. tetradactylum and E. rhadinum using mitochondrial gene, Cytochrome Oxidase I. The levels of genetic differentiation and population structure between the two species were successfully quantified.
format Thesis
author Wahid, Nurul Atikah
author_facet Wahid, Nurul Atikah
author_sort Wahid, Nurul Atikah
title Population genetic structures of Eleutheronema tetradactylum (Shaw, 1804) and Eleutheronema rhadinum (Jordan and Evermann, 1902) in Malaysian waters
title_short Population genetic structures of Eleutheronema tetradactylum (Shaw, 1804) and Eleutheronema rhadinum (Jordan and Evermann, 1902) in Malaysian waters
title_full Population genetic structures of Eleutheronema tetradactylum (Shaw, 1804) and Eleutheronema rhadinum (Jordan and Evermann, 1902) in Malaysian waters
title_fullStr Population genetic structures of Eleutheronema tetradactylum (Shaw, 1804) and Eleutheronema rhadinum (Jordan and Evermann, 1902) in Malaysian waters
title_full_unstemmed Population genetic structures of Eleutheronema tetradactylum (Shaw, 1804) and Eleutheronema rhadinum (Jordan and Evermann, 1902) in Malaysian waters
title_sort population genetic structures of eleutheronema tetradactylum (shaw, 1804) and eleutheronema rhadinum (jordan and evermann, 1902) in malaysian waters
publishDate 2019
url http://psasir.upm.edu.my/id/eprint/99175/1/FP%202020%2043%20IR.pdf
http://psasir.upm.edu.my/id/eprint/99175/
_version_ 1759690991020802048
score 13.211869

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