Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments
BackgroundDispersal 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 S...
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ftvliz:oai:oma.vliz.be:293723 2023-05-15T13:54:11+02:00 Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments Hauquier, F. Leliaert, F. Rigaux, A. Derycke, S. Vanreusel, A. 2017 application/pdf https://www.vliz.be/imisdocs/publications/311673.pdf en eng info:eu-repo/semantics/altIdentifier/wos/000402641000001 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1186/s12862-017-0968-1 https://www.vliz.be/imisdocs/publications/311673.pdf info:eu-repo/semantics/openAccess %3Ci%3EBMC+Evol.+Biol.+17%3C%2Fi%3E%3A+120.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1186%2Fs12862-017-0968-1%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1186%2Fs12862-017-0968-1%3C%2Fa%3E Desmodora de Man 1889 Nematoda [Nematodes] Sabatieria Rouville 1903 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftvliz https://doi.org/10.1186/s12862-017-0968-1 2022-05-01T10:58:15Z BackgroundDispersal 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 (200–500m) 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.ResultsSequence 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.ConclusionsOur 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 habitat preferences (surface versus deeper sediment layers). Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Southern Ocean Weddell Sea Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) Antarctic Antarctic Peninsula Southern Ocean The Antarctic Weddell Weddell Sea BMC Evolutionary Biology 17 1 |
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Open Polar |
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Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
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ftvliz |
language |
English |
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Desmodora de Man 1889 Nematoda [Nematodes] Sabatieria Rouville 1903 |
spellingShingle |
Desmodora de Man 1889 Nematoda [Nematodes] Sabatieria Rouville 1903 Hauquier, F. Leliaert, F. Rigaux, A. Derycke, S. Vanreusel, A. Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments |
topic_facet |
Desmodora de Man 1889 Nematoda [Nematodes] Sabatieria Rouville 1903 |
description |
BackgroundDispersal 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 (200–500m) 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.ResultsSequence 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.ConclusionsOur 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 habitat preferences (surface versus deeper sediment layers). |
format |
Article in Journal/Newspaper |
author |
Hauquier, F. Leliaert, F. Rigaux, A. Derycke, S. Vanreusel, A. |
author_facet |
Hauquier, F. Leliaert, F. Rigaux, A. Derycke, S. Vanreusel, A. |
author_sort |
Hauquier, F. |
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://www.vliz.be/imisdocs/publications/311673.pdf |
geographic |
Antarctic Antarctic Peninsula Southern Ocean The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Southern Ocean The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Peninsula Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Southern Ocean Weddell Sea |
op_source |
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op_relation |
info:eu-repo/semantics/altIdentifier/wos/000402641000001 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1186/s12862-017-0968-1 https://www.vliz.be/imisdocs/publications/311673.pdf |
op_rights |
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_ |
1766259864503320576 |