Species flock in the North American Great Lakes: Molecular ecology of Lake Nipigon ciscoes (Teleostei: Coregonidae: Coregonus)
Studies on north temperate fish species indicate that new habitat availability following the last ice sheet retreat has promoted ecological speciation in postglacial lakes. Extensive ecophenotypic polymorphisms observed among the North American Great Lakes ciscoes suggest that this fish group has ra...
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Online Access: | https://espace.library.uq.edu.au/view/UQ:d958f81 |
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:d958f81 2023-05-15T16:41:30+02:00 Species flock in the North American Great Lakes: Molecular ecology of Lake Nipigon ciscoes (Teleostei: Coregonidae: Coregonus) Turgeon, Julie Estoup, Arnaud Bernatchez, Louis 1999-12-01 https://espace.library.uq.edu.au/view/UQ:d958f81 eng eng Society for the Study of Evolution doi:10.1111/j.1558-5646.1999.tb04568.x issn:0014-3820 Coregonus Genetic differentiation Microsatellites Morphology Species flock Trophic ecology 1100 Agricultural and Biological Sciences 1105 Ecology Evolution Behavior and Systematics 1311 Genetics Journal Article 1999 ftunivqespace https://doi.org/10.1111/j.1558-5646.1999.tb04568.x 2020-11-10T01:21:26Z Studies on north temperate fish species indicate that new habitat availability following the last ice sheet retreat has promoted ecological speciation in postglacial lakes. Extensive ecophenotypic polymorphisms observed among the North American Great Lakes ciscoes suggest that this fish group has radiated through trophic adaptation and reproductive isolation. This study aims at relating the ecomorphological and genetic polymorphisms expressed by the Lake Nipigon ciscoes to evaluate the likelihood of an intralacustrine divergence driven by the exploitation of alternative resources. Morphological variation and trophic and spatial niches are characterized and contrasted among 203 individuals. Genetic variation at six microsatellite loci is also analyzed to appraise the extent of genetic differentiation among these morphotypes. Ecomorphological data confirm the existence of four distinct morphotypes displaying various levels of trophic and depth niche overlap and specialization. However, ecological and morphological variations were not coupled as expected, suggesting that trophic morphology is not always predictive of ecology. Although extensive genetic variability was observed, little genetic differentiation was found among morphotypes, with only one morph being slightly but significantly differentiated. Contrasting patterns of morphological, ecological, and genetic polymorphisms did not support the hypothesis of ecological speciation: the most ecologically different forms were morphologically most similar, while the only genetically differentiated morph was the least ecologically specialized. The low levels of genetic differentiation and the congruence between 0 and φ estimates altogether suggest a recent (most likely postglacial) process of divergence and/or high gene flow among morphs A, C, and D, whereas higher φ estimates for comparison involving morph B suggest that this morph may be derived from another colonizing lineage exchanging little genes with the other morphs. Patterns of ecophenotypic and genetic diversity are also compatible with a more complex evolutionary history involving hybridization and introgression. Article in Journal/Newspaper Ice Sheet The University of Queensland: UQ eSpace Evolution 53 6 1857 1871 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Coregonus Genetic differentiation Microsatellites Morphology Species flock Trophic ecology 1100 Agricultural and Biological Sciences 1105 Ecology Evolution Behavior and Systematics 1311 Genetics |
spellingShingle |
Coregonus Genetic differentiation Microsatellites Morphology Species flock Trophic ecology 1100 Agricultural and Biological Sciences 1105 Ecology Evolution Behavior and Systematics 1311 Genetics Turgeon, Julie Estoup, Arnaud Bernatchez, Louis Species flock in the North American Great Lakes: Molecular ecology of Lake Nipigon ciscoes (Teleostei: Coregonidae: Coregonus) |
topic_facet |
Coregonus Genetic differentiation Microsatellites Morphology Species flock Trophic ecology 1100 Agricultural and Biological Sciences 1105 Ecology Evolution Behavior and Systematics 1311 Genetics |
description |
Studies on north temperate fish species indicate that new habitat availability following the last ice sheet retreat has promoted ecological speciation in postglacial lakes. Extensive ecophenotypic polymorphisms observed among the North American Great Lakes ciscoes suggest that this fish group has radiated through trophic adaptation and reproductive isolation. This study aims at relating the ecomorphological and genetic polymorphisms expressed by the Lake Nipigon ciscoes to evaluate the likelihood of an intralacustrine divergence driven by the exploitation of alternative resources. Morphological variation and trophic and spatial niches are characterized and contrasted among 203 individuals. Genetic variation at six microsatellite loci is also analyzed to appraise the extent of genetic differentiation among these morphotypes. Ecomorphological data confirm the existence of four distinct morphotypes displaying various levels of trophic and depth niche overlap and specialization. However, ecological and morphological variations were not coupled as expected, suggesting that trophic morphology is not always predictive of ecology. Although extensive genetic variability was observed, little genetic differentiation was found among morphotypes, with only one morph being slightly but significantly differentiated. Contrasting patterns of morphological, ecological, and genetic polymorphisms did not support the hypothesis of ecological speciation: the most ecologically different forms were morphologically most similar, while the only genetically differentiated morph was the least ecologically specialized. The low levels of genetic differentiation and the congruence between 0 and φ estimates altogether suggest a recent (most likely postglacial) process of divergence and/or high gene flow among morphs A, C, and D, whereas higher φ estimates for comparison involving morph B suggest that this morph may be derived from another colonizing lineage exchanging little genes with the other morphs. Patterns of ecophenotypic and genetic diversity are also compatible with a more complex evolutionary history involving hybridization and introgression. |
format |
Article in Journal/Newspaper |
author |
Turgeon, Julie Estoup, Arnaud Bernatchez, Louis |
author_facet |
Turgeon, Julie Estoup, Arnaud Bernatchez, Louis |
author_sort |
Turgeon, Julie |
title |
Species flock in the North American Great Lakes: Molecular ecology of Lake Nipigon ciscoes (Teleostei: Coregonidae: Coregonus) |
title_short |
Species flock in the North American Great Lakes: Molecular ecology of Lake Nipigon ciscoes (Teleostei: Coregonidae: Coregonus) |
title_full |
Species flock in the North American Great Lakes: Molecular ecology of Lake Nipigon ciscoes (Teleostei: Coregonidae: Coregonus) |
title_fullStr |
Species flock in the North American Great Lakes: Molecular ecology of Lake Nipigon ciscoes (Teleostei: Coregonidae: Coregonus) |
title_full_unstemmed |
Species flock in the North American Great Lakes: Molecular ecology of Lake Nipigon ciscoes (Teleostei: Coregonidae: Coregonus) |
title_sort |
species flock in the north american great lakes: molecular ecology of lake nipigon ciscoes (teleostei: coregonidae: coregonus) |
publisher |
Society for the Study of Evolution |
publishDate |
1999 |
url |
https://espace.library.uq.edu.au/view/UQ:d958f81 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
doi:10.1111/j.1558-5646.1999.tb04568.x issn:0014-3820 |
op_doi |
https://doi.org/10.1111/j.1558-5646.1999.tb04568.x |
container_title |
Evolution |
container_volume |
53 |
container_issue |
6 |
container_start_page |
1857 |
op_container_end_page |
1871 |
_version_ |
1766031940780032000 |