Population divergences despite long pelagic larval stages: lessons from crocodile icefishes (Channichthyidae)
Dispersal via pelagic larval stages plays a key role in population connectivity of many marine species. The degree of connectivity is often correlated with the time that larvae spend in the water column. The Antarctic notothenioid fishes develop through an unusually long pelagic larval phase often e...
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ftopenagrar:oai:www.openagrar.de:timport_mods_00018145 2024-09-15T17:41:11+00:00 Population divergences despite long pelagic larval stages: lessons from crocodile icefishes (Channichthyidae) Damerau, Malte Matschiner, Michael Salzburger, Walter Hanel, Reinhold 2014 15 https://doi.org/10.1111/mec.12612 https://www.openagrar.de/receive/timport_mods_00018145 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00018145/dn053352.pdf eng eng Molecular Ecology -- Mol Ecol -- 1365-294X -- 0962-1083 -- 10.1111/(ISSN)1365-294X -- 2020749-9 -- 1126687-9 -- https://onlinelibrary.wiley.com/journal/1365294X -- http://www.bibliothek.uni-regensburg.de/ezeit/?2020749 -- http://dx.doi.org/10.1111/(ISSN)1365-294X https://doi.org/10.1111/mec.12612 https://www.openagrar.de/receive/timport_mods_00018145 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00018145/dn053352.pdf only signed in user info:eu-repo/semantics/restrictedAccess article Text adaptive radiation generation time larval dispersal notothenioids population genetics article Text doc-type:article 2014 ftopenagrar https://doi.org/10.1111/mec.1261210.1111/(ISSN)1365-294X 2024-07-08T23:56:24Z Dispersal via pelagic larval stages plays a key role in population connectivity of many marine species. The degree of connectivity is often correlated with the time that larvae spend in the water column. The Antarctic notothenioid fishes develop through an unusually long pelagic larval phase often exceeding 1 year. Notothenioids thus represent a prime model system for studying the influence of prolonged larval phases on population structure in otherwise demersal species. Here, we compare the population genetic structure and demographic history of two sub-Antarctic crocodile icefish species (Chaenocephalus aceratus and Champsocephalus gunnari) from the Scotia Arc and Bouvet Island in the Atlantic sector of the Southern Ocean to delineate the relative importance of species-specific, oceanographic and paleoclimatic factors to gene flow. Based on 7 (C. aceratus) and 8 (C. gunnari) microsatellites, as well as two mitochondrial DNA markers (cytochrome b, D-loop), we detect pronounced population genetic structure in both species (AMOVA FSTs range from 0.04 to 0.53). High genetic similarities were found concordantly in the populations sampled at the Southern Scotia Arc between Elephant Island and South Orkney Islands, whereas the populations from Bouvet Island, which is located far to the east of the Scotia Arc, are substantially differentiated from those of the Scotia Arc region. Nonetheless, haplotype genealogies and Bayesian cluster analyses suggest occasional gene flow over thousands of kilometres. Higher divergences between populations of C. gunnari as compared to C. aceratus are probably caused by lower dispersal capabilities and demographic effects. Bayesian skyline plots reveal population size reductions during past glacial events in both species with an estimated onset of population expansions about 25 000 years ago. Article in Journal/Newspaper Antarc* Antarctic Bouvet Island Elephant Island Icefish South Orkney Islands Southern Ocean OpenAgrar (OA) Molecular Ecology 23 2 284 299 |
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Open Polar |
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OpenAgrar (OA) |
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ftopenagrar |
language |
English |
topic |
article Text adaptive radiation generation time larval dispersal notothenioids population genetics |
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article Text adaptive radiation generation time larval dispersal notothenioids population genetics Damerau, Malte Matschiner, Michael Salzburger, Walter Hanel, Reinhold Population divergences despite long pelagic larval stages: lessons from crocodile icefishes (Channichthyidae) |
topic_facet |
article Text adaptive radiation generation time larval dispersal notothenioids population genetics |
description |
Dispersal via pelagic larval stages plays a key role in population connectivity of many marine species. The degree of connectivity is often correlated with the time that larvae spend in the water column. The Antarctic notothenioid fishes develop through an unusually long pelagic larval phase often exceeding 1 year. Notothenioids thus represent a prime model system for studying the influence of prolonged larval phases on population structure in otherwise demersal species. Here, we compare the population genetic structure and demographic history of two sub-Antarctic crocodile icefish species (Chaenocephalus aceratus and Champsocephalus gunnari) from the Scotia Arc and Bouvet Island in the Atlantic sector of the Southern Ocean to delineate the relative importance of species-specific, oceanographic and paleoclimatic factors to gene flow. Based on 7 (C. aceratus) and 8 (C. gunnari) microsatellites, as well as two mitochondrial DNA markers (cytochrome b, D-loop), we detect pronounced population genetic structure in both species (AMOVA FSTs range from 0.04 to 0.53). High genetic similarities were found concordantly in the populations sampled at the Southern Scotia Arc between Elephant Island and South Orkney Islands, whereas the populations from Bouvet Island, which is located far to the east of the Scotia Arc, are substantially differentiated from those of the Scotia Arc region. Nonetheless, haplotype genealogies and Bayesian cluster analyses suggest occasional gene flow over thousands of kilometres. Higher divergences between populations of C. gunnari as compared to C. aceratus are probably caused by lower dispersal capabilities and demographic effects. Bayesian skyline plots reveal population size reductions during past glacial events in both species with an estimated onset of population expansions about 25 000 years ago. |
format |
Article in Journal/Newspaper |
author |
Damerau, Malte Matschiner, Michael Salzburger, Walter Hanel, Reinhold |
author_facet |
Damerau, Malte Matschiner, Michael Salzburger, Walter Hanel, Reinhold |
author_sort |
Damerau, Malte |
title |
Population divergences despite long pelagic larval stages: lessons from crocodile icefishes (Channichthyidae) |
title_short |
Population divergences despite long pelagic larval stages: lessons from crocodile icefishes (Channichthyidae) |
title_full |
Population divergences despite long pelagic larval stages: lessons from crocodile icefishes (Channichthyidae) |
title_fullStr |
Population divergences despite long pelagic larval stages: lessons from crocodile icefishes (Channichthyidae) |
title_full_unstemmed |
Population divergences despite long pelagic larval stages: lessons from crocodile icefishes (Channichthyidae) |
title_sort |
population divergences despite long pelagic larval stages: lessons from crocodile icefishes (channichthyidae) |
publishDate |
2014 |
url |
https://doi.org/10.1111/mec.12612 https://www.openagrar.de/receive/timport_mods_00018145 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00018145/dn053352.pdf |
genre |
Antarc* Antarctic Bouvet Island Elephant Island Icefish South Orkney Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Bouvet Island Elephant Island Icefish South Orkney Islands Southern Ocean |
op_relation |
Molecular Ecology -- Mol Ecol -- 1365-294X -- 0962-1083 -- 10.1111/(ISSN)1365-294X -- 2020749-9 -- 1126687-9 -- https://onlinelibrary.wiley.com/journal/1365294X -- http://www.bibliothek.uni-regensburg.de/ezeit/?2020749 -- http://dx.doi.org/10.1111/(ISSN)1365-294X https://doi.org/10.1111/mec.12612 https://www.openagrar.de/receive/timport_mods_00018145 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00018145/dn053352.pdf |
op_rights |
only signed in user info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1111/mec.1261210.1111/(ISSN)1365-294X |
container_title |
Molecular Ecology |
container_volume |
23 |
container_issue |
2 |
container_start_page |
284 |
op_container_end_page |
299 |
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1810487329589035008 |