Sharp phylogeographical differentiation near the southern range edge of the silverside Odontesthes nigricans: Distinct peripheral populations and incipient speciation?
The silverside Odontesthes nigricans is the Atheriniform species that reach the southernmost latitude in Patagonia. Its wide distribution ranges from temperate waters in the Atlantic coast of South America (39°S, Buenos Aires Province, Argentina) to the Sub-Antarctic environment of Cape Horn (56°S)....
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ftconicet:oai:ri.conicet.gov.ar:11336/119470 2023-10-09T21:45:36+02:00 Sharp phylogeographical differentiation near the southern range edge of the silverside Odontesthes nigricans: Distinct peripheral populations and incipient speciation? Cocito, Laura Leilén Ceballos, Santiago Guillermo Fernandez, Daniel Alfredo application/pdf http://hdl.handle.net/11336/119470 eng eng Academic Press Ltd - Elsevier Science Ltd info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ecss.2019.106276 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0272771419301714 http://hdl.handle.net/11336/119470 Cocito, Laura Leilén; Ceballos, Santiago Guillermo; Fernandez, Daniel Alfredo; Sharp phylogeographical differentiation near the southern range edge of the silverside Odontesthes nigricans: Distinct peripheral populations and incipient speciation?; Academic Press Ltd - Elsevier Science Ltd; Estuarine, Coastal and Shelf Science; 226; 10-2019; 1-6 0272-7714 CONICET Digital CONICET info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ ATHERINOMORPHA BIOGEOGRAPHY GENETIC SILVERSIDES SPECIATION https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.ecss.2019.106276 2023-09-24T20:29:25Z The silverside Odontesthes nigricans is the Atheriniform species that reach the southernmost latitude in Patagonia. Its wide distribution ranges from temperate waters in the Atlantic coast of South America (39°S, Buenos Aires Province, Argentina) to the Sub-Antarctic environment of Cape Horn (56°S). A previous study has shown significant intraspecific differences on growth parameters and otolith morphology between the southern peripheral population of O. nigricans in the Beagle Channel and the populations in the Atlantic coast of Tierra del Fuego. In this work, we report the first data on population genetics of O. nigricans along the southern part of its distributional range, including the peripheral populations of Beagle Channel. To examine the genetic variability, we analyzed 224 sequences of 815 bp of mitochondrial control region generated from individuals captured at two sites in the Beagle Channel and six sites at the Atlantic coast. The genetic structure assessment revealed a sharp phylogeographic division between Beagle Channel and the Atlantic coast of Patagonia with a 39.83% of variance among groups. The observed genetic diversity was lower in Beagle Channel than in the Atlantic coast sites and the demographic analyses are compatible with a scenario of past population expansion, especially in Beagle Channel. We hypothesize two possible scenarios: one is a recent colonization of the Beagle Channel from the Atlantic Coast followed by divergence promoted by adaptation to local conditions. On the other hand, population differentiation may have been attained or initiated in allopatric conditions during Quaternary glacial phases and the populations may now be experiencing a secondary contact near the eastern tip of Tierra del Fuego. These hypotheses should be addressed in the future with genomics tools. By now, these populations should be considered as different units for conservation and management purposes. Fil: Cocito, Laura Leilén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro ... Article in Journal/Newspaper Antarc* Antarctic Tierra del Fuego CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic Patagonia Argentina Cape Horn ENVELOPE(-135.021,-135.021,61.583,61.583) Estuarine, Coastal and Shelf Science 226 106276 |
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CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
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language |
English |
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ATHERINOMORPHA BIOGEOGRAPHY GENETIC SILVERSIDES SPECIATION https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
ATHERINOMORPHA BIOGEOGRAPHY GENETIC SILVERSIDES SPECIATION https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 Cocito, Laura Leilén Ceballos, Santiago Guillermo Fernandez, Daniel Alfredo Sharp phylogeographical differentiation near the southern range edge of the silverside Odontesthes nigricans: Distinct peripheral populations and incipient speciation? |
topic_facet |
ATHERINOMORPHA BIOGEOGRAPHY GENETIC SILVERSIDES SPECIATION https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
description |
The silverside Odontesthes nigricans is the Atheriniform species that reach the southernmost latitude in Patagonia. Its wide distribution ranges from temperate waters in the Atlantic coast of South America (39°S, Buenos Aires Province, Argentina) to the Sub-Antarctic environment of Cape Horn (56°S). A previous study has shown significant intraspecific differences on growth parameters and otolith morphology between the southern peripheral population of O. nigricans in the Beagle Channel and the populations in the Atlantic coast of Tierra del Fuego. In this work, we report the first data on population genetics of O. nigricans along the southern part of its distributional range, including the peripheral populations of Beagle Channel. To examine the genetic variability, we analyzed 224 sequences of 815 bp of mitochondrial control region generated from individuals captured at two sites in the Beagle Channel and six sites at the Atlantic coast. The genetic structure assessment revealed a sharp phylogeographic division between Beagle Channel and the Atlantic coast of Patagonia with a 39.83% of variance among groups. The observed genetic diversity was lower in Beagle Channel than in the Atlantic coast sites and the demographic analyses are compatible with a scenario of past population expansion, especially in Beagle Channel. We hypothesize two possible scenarios: one is a recent colonization of the Beagle Channel from the Atlantic Coast followed by divergence promoted by adaptation to local conditions. On the other hand, population differentiation may have been attained or initiated in allopatric conditions during Quaternary glacial phases and the populations may now be experiencing a secondary contact near the eastern tip of Tierra del Fuego. These hypotheses should be addressed in the future with genomics tools. By now, these populations should be considered as different units for conservation and management purposes. Fil: Cocito, Laura Leilén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro ... |
format |
Article in Journal/Newspaper |
author |
Cocito, Laura Leilén Ceballos, Santiago Guillermo Fernandez, Daniel Alfredo |
author_facet |
Cocito, Laura Leilén Ceballos, Santiago Guillermo Fernandez, Daniel Alfredo |
author_sort |
Cocito, Laura Leilén |
title |
Sharp phylogeographical differentiation near the southern range edge of the silverside Odontesthes nigricans: Distinct peripheral populations and incipient speciation? |
title_short |
Sharp phylogeographical differentiation near the southern range edge of the silverside Odontesthes nigricans: Distinct peripheral populations and incipient speciation? |
title_full |
Sharp phylogeographical differentiation near the southern range edge of the silverside Odontesthes nigricans: Distinct peripheral populations and incipient speciation? |
title_fullStr |
Sharp phylogeographical differentiation near the southern range edge of the silverside Odontesthes nigricans: Distinct peripheral populations and incipient speciation? |
title_full_unstemmed |
Sharp phylogeographical differentiation near the southern range edge of the silverside Odontesthes nigricans: Distinct peripheral populations and incipient speciation? |
title_sort |
sharp phylogeographical differentiation near the southern range edge of the silverside odontesthes nigricans: distinct peripheral populations and incipient speciation? |
publisher |
Academic Press Ltd - Elsevier Science Ltd |
url |
http://hdl.handle.net/11336/119470 |
long_lat |
ENVELOPE(-135.021,-135.021,61.583,61.583) |
geographic |
Antarctic Patagonia Argentina Cape Horn |
geographic_facet |
Antarctic Patagonia Argentina Cape Horn |
genre |
Antarc* Antarctic Tierra del Fuego |
genre_facet |
Antarc* Antarctic Tierra del Fuego |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ecss.2019.106276 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0272771419301714 http://hdl.handle.net/11336/119470 Cocito, Laura Leilén; Ceballos, Santiago Guillermo; Fernandez, Daniel Alfredo; Sharp phylogeographical differentiation near the southern range edge of the silverside Odontesthes nigricans: Distinct peripheral populations and incipient speciation?; Academic Press Ltd - Elsevier Science Ltd; Estuarine, Coastal and Shelf Science; 226; 10-2019; 1-6 0272-7714 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1016/j.ecss.2019.106276 |
container_title |
Estuarine, Coastal and Shelf Science |
container_volume |
226 |
container_start_page |
106276 |
_version_ |
1779320242669879296 |