Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments
Background: Dispersal ability, population genetic structure and species divergence in marine nematodes are still poorly understood, especially in remote areas such as the Southern Ocean. We investigated genetic differentiation of species and populations of the free-living endobenthic nematode genera...
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ftunivgent:oai:archive.ugent.be:8521833 2023-06-11T04:04:52+02:00 Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments Hauquier, Freija Leliaert, Frédérik Rigaux, Annelien Derycke, Sofie Vanreusel, Ann 2017 application/pdf https://biblio.ugent.be/publication/8521833 http://hdl.handle.net/1854/LU-8521833 https://doi.org/10.1186/s12862-017-0968-1 https://biblio.ugent.be/publication/8521833/file/8521836 eng eng https://biblio.ugent.be/publication/8521833 http://hdl.handle.net/1854/LU-8521833 http://dx.doi.org/10.1186/s12862-017-0968-1 https://biblio.ugent.be/publication/8521833/file/8521836 Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) info:eu-repo/semantics/openAccess BMC EVOLUTIONARY BIOLOGY ISSN: 1471-2148 Biology and Life Sciences Earth and Environmental Sciences Antarctica Continental shelf Cryptic species Desmodora Dispersal Nematoda Phylogeny Population genetics Sabatieria MITOCHONDRIAL-DNA NUCLEOTIDE-SEQUENCES MOLECULAR DIVERSITY PELLIODITIS-MARINA CRYPTIC DIVERSITY LARGE PHYLOGENIES DEEP-SEA SPECIATION POPULATION journalArticle info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftunivgent https://doi.org/10.1186/s12862-017-0968-1 2023-05-10T22:19:53Z Background: Dispersal ability, population genetic structure and species divergence in marine nematodes are still poorly understood, especially in remote areas such as the Southern Ocean. We investigated genetic differentiation of species and populations of the free-living endobenthic nematode genera Sabatieria and Desmodora using nuclear 18S rDNA, internal transcribed spacer (ITS) rDNA, and mitochondrial cytochrome oxidase I (COI) gene sequences. Specimens were collected at continental shelf depths (200-500 m) near the Antarctic Peninsula, Scotia Arc and eastern side of the Weddell Sea. The two nematode genera co-occurred at all sampled locations, but with different vertical distribution in the sediment. A combination of phylogenetic (GMYC, Bayesian Inference, Maximum Likelihood) and population genetic (AMOVA) analyses were used for species delimitation and assessment of gene flow between sampling locations. Results: Sequence analyses resulted in the delimitation of four divergent species lineages in Sabatieria, two of which could not be discriminated morphologically and most likely constitute cryptic species. Two species were recognised in Desmodora, one of which showed large intraspecific morphological variation. Both genera comprised species that were restricted to one side of the Weddell Sea and species that were widely spread across it. Population genetic structuring was highly significant and more pronounced in the deeper sediment-dwelling Sabatieria species, which are generally less prone to resuspension and passive dispersal in the water column than surface Desmodora species. Conclusions: Our results indicate that gene flow is restricted at large geographic distance in the Southern Ocean, which casts doubt on the efficiency of the Weddell gyre and Antarctic Circumpolar Current in facilitating circum-Antarctic nematode species distributions. We also show that genetic structuring and cryptic speciation can be very different in nematode species isolated from the same geographic area, but with different ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Southern Ocean Weddell Sea Ghent University Academic Bibliography Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea Weddell BMC Evolutionary Biology 17 1 |
institution |
Open Polar |
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Ghent University Academic Bibliography |
op_collection_id |
ftunivgent |
language |
English |
topic |
Biology and Life Sciences Earth and Environmental Sciences Antarctica Continental shelf Cryptic species Desmodora Dispersal Nematoda Phylogeny Population genetics Sabatieria MITOCHONDRIAL-DNA NUCLEOTIDE-SEQUENCES MOLECULAR DIVERSITY PELLIODITIS-MARINA CRYPTIC DIVERSITY LARGE PHYLOGENIES DEEP-SEA SPECIATION POPULATION |
spellingShingle |
Biology and Life Sciences Earth and Environmental Sciences Antarctica Continental shelf Cryptic species Desmodora Dispersal Nematoda Phylogeny Population genetics Sabatieria MITOCHONDRIAL-DNA NUCLEOTIDE-SEQUENCES MOLECULAR DIVERSITY PELLIODITIS-MARINA CRYPTIC DIVERSITY LARGE PHYLOGENIES DEEP-SEA SPECIATION POPULATION Hauquier, Freija Leliaert, Frédérik Rigaux, Annelien Derycke, Sofie Vanreusel, Ann Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments |
topic_facet |
Biology and Life Sciences Earth and Environmental Sciences Antarctica Continental shelf Cryptic species Desmodora Dispersal Nematoda Phylogeny Population genetics Sabatieria MITOCHONDRIAL-DNA NUCLEOTIDE-SEQUENCES MOLECULAR DIVERSITY PELLIODITIS-MARINA CRYPTIC DIVERSITY LARGE PHYLOGENIES DEEP-SEA SPECIATION POPULATION |
description |
Background: Dispersal ability, population genetic structure and species divergence in marine nematodes are still poorly understood, especially in remote areas such as the Southern Ocean. We investigated genetic differentiation of species and populations of the free-living endobenthic nematode genera Sabatieria and Desmodora using nuclear 18S rDNA, internal transcribed spacer (ITS) rDNA, and mitochondrial cytochrome oxidase I (COI) gene sequences. Specimens were collected at continental shelf depths (200-500 m) near the Antarctic Peninsula, Scotia Arc and eastern side of the Weddell Sea. The two nematode genera co-occurred at all sampled locations, but with different vertical distribution in the sediment. A combination of phylogenetic (GMYC, Bayesian Inference, Maximum Likelihood) and population genetic (AMOVA) analyses were used for species delimitation and assessment of gene flow between sampling locations. Results: Sequence analyses resulted in the delimitation of four divergent species lineages in Sabatieria, two of which could not be discriminated morphologically and most likely constitute cryptic species. Two species were recognised in Desmodora, one of which showed large intraspecific morphological variation. Both genera comprised species that were restricted to one side of the Weddell Sea and species that were widely spread across it. Population genetic structuring was highly significant and more pronounced in the deeper sediment-dwelling Sabatieria species, which are generally less prone to resuspension and passive dispersal in the water column than surface Desmodora species. Conclusions: Our results indicate that gene flow is restricted at large geographic distance in the Southern Ocean, which casts doubt on the efficiency of the Weddell gyre and Antarctic Circumpolar Current in facilitating circum-Antarctic nematode species distributions. We also show that genetic structuring and cryptic speciation can be very different in nematode species isolated from the same geographic area, but with different ... |
format |
Article in Journal/Newspaper |
author |
Hauquier, Freija Leliaert, Frédérik Rigaux, Annelien Derycke, Sofie Vanreusel, Ann |
author_facet |
Hauquier, Freija Leliaert, Frédérik Rigaux, Annelien Derycke, Sofie Vanreusel, Ann |
author_sort |
Hauquier, Freija |
title |
Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments |
title_short |
Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments |
title_full |
Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments |
title_fullStr |
Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments |
title_full_unstemmed |
Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments |
title_sort |
distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in antarctic sediments |
publishDate |
2017 |
url |
https://biblio.ugent.be/publication/8521833 http://hdl.handle.net/1854/LU-8521833 https://doi.org/10.1186/s12862-017-0968-1 https://biblio.ugent.be/publication/8521833/file/8521836 |
geographic |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea Weddell |
geographic_facet |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea Weddell |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Southern Ocean Weddell Sea |
op_source |
BMC EVOLUTIONARY BIOLOGY ISSN: 1471-2148 |
op_relation |
https://biblio.ugent.be/publication/8521833 http://hdl.handle.net/1854/LU-8521833 http://dx.doi.org/10.1186/s12862-017-0968-1 https://biblio.ugent.be/publication/8521833/file/8521836 |
op_rights |
Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1186/s12862-017-0968-1 |
container_title |
BMC Evolutionary Biology |
container_volume |
17 |
container_issue |
1 |
_version_ |
1768391382326575104 |