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...
Published in: | Molecular Ecology |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Blackwell
2013
|
Subjects: | |
Online Access: | http://edoc.unibas.ch/dok/A6223438 https://edoc.unibas.ch/31304/ https://doi.org/10.1111/mec.12612 |
id |
ftunivbasel:oai:edoc.unibas.ch:31304 |
---|---|
record_format |
openpolar |
spelling |
ftunivbasel:oai:edoc.unibas.ch:31304 2023-05-15T13:38:40+02:00 Population divergences despite long pelagic larval stages: lessons from crocodile icefishes (Channichthyidae) Damerau, M. Matschiner, M. Salzburger, W. Hanel, R. 2013 http://edoc.unibas.ch/dok/A6223438 https://edoc.unibas.ch/31304/ https://doi.org/10.1111/mec.12612 unknown Blackwell Damerau, M. and Matschiner, M. and Salzburger, W. and Hanel, R. (2013) Population divergences despite long pelagic larval stages: lessons from crocodile icefishes (Channichthyidae). Molecular ecology, Vol. 23, no. 2 , S. 284–299. info:pmid/24372945 doi:10.1111/mec.12612 urn:ISSN:0962-1083 info:eu-repo/semantics/closedAccess Article PeerReviewed 2013 ftunivbasel https://doi.org/10.1111/mec.12612 2023-03-05T07:03:07Z 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 University of Basel: edoc Antarctic Bouvet ENVELOPE(3.358,3.358,-54.422,-54.422) Bouvet Island ENVELOPE(3.358,3.358,-54.422,-54.422) Elephant Island ENVELOPE(-55.184,-55.184,-61.085,-61.085) South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Southern Ocean The Antarctic Molecular Ecology 23 2 284 299 |
institution |
Open Polar |
collection |
University of Basel: edoc |
op_collection_id |
ftunivbasel |
language |
unknown |
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, M. Matschiner, M. Salzburger, W. Hanel, R. |
spellingShingle |
Damerau, M. Matschiner, M. Salzburger, W. Hanel, R. Population divergences despite long pelagic larval stages: lessons from crocodile icefishes (Channichthyidae) |
author_facet |
Damerau, M. Matschiner, M. Salzburger, W. Hanel, R. |
author_sort |
Damerau, M. |
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) |
publisher |
Blackwell |
publishDate |
2013 |
url |
http://edoc.unibas.ch/dok/A6223438 https://edoc.unibas.ch/31304/ https://doi.org/10.1111/mec.12612 |
long_lat |
ENVELOPE(3.358,3.358,-54.422,-54.422) ENVELOPE(3.358,3.358,-54.422,-54.422) ENVELOPE(-55.184,-55.184,-61.085,-61.085) ENVELOPE(-45.500,-45.500,-60.583,-60.583) |
geographic |
Antarctic Bouvet Bouvet Island Elephant Island South Orkney Islands Southern Ocean The Antarctic |
geographic_facet |
Antarctic Bouvet Bouvet Island Elephant Island South Orkney Islands Southern Ocean The Antarctic |
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 |
Damerau, M. and Matschiner, M. and Salzburger, W. and Hanel, R. (2013) Population divergences despite long pelagic larval stages: lessons from crocodile icefishes (Channichthyidae). Molecular ecology, Vol. 23, no. 2 , S. 284–299. info:pmid/24372945 doi:10.1111/mec.12612 urn:ISSN:0962-1083 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1111/mec.12612 |
container_title |
Molecular Ecology |
container_volume |
23 |
container_issue |
2 |
container_start_page |
284 |
op_container_end_page |
299 |
_version_ |
1766109419678990336 |