Population Differentiation and Species Formation in the Deep Sea: The Potential Role of Environmental Gradients and Depth
Ecological speciation probably plays a more prominent role in diversification than previously thought, particularly in marine ecosystems where dispersal potential is great and where few obvious barriers to gene flow exist. This may be especially true in the deep sea where allopatric speciation seems...
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ftdatacite:10.34944/dspace/5345 2023-05-15T17:34:34+02:00 Population Differentiation and Species Formation in the Deep Sea: The Potential Role of Environmental Gradients and Depth Unkn Unknown 2013 https://dx.doi.org/10.34944/dspace/5345 https://scholarshare.temple.edu/handle/20.500.12613/5363 en eng My University CC BY Animals Atlantic Ocean Bayes Theorem Bivalvia Cell Nucleus DNA, Mitochondrial Ecosystem Gene Flow Genetic Speciation Genetic Variation Multilocus Sequence Typing Phylogeny Text Article article-journal ScholarlyArticle 2013 ftdatacite https://doi.org/10.34944/dspace/5345 2021-11-05T12:55:41Z Ecological speciation probably plays a more prominent role in diversification than previously thought, particularly in marine ecosystems where dispersal potential is great and where few obvious barriers to gene flow exist. This may be especially true in the deep sea where allopatric speciation seems insufficient to account for the rich and largely endemic fauna. Ecologically driven population differentiation and speciation are likely to be most prevalent along environmental gradients, such as those attending changes in depth. We quantified patterns of genetic variation along a depth gradient (1600-3800m) in the western North Atlantic for a protobranch bivalve (Nucula atacellana) to test for population divergence. Multilocus analyses indicated a sharp discontinuity across a narrow depth range, with extremely low gene flow inferred between shallow and deep populations for thousands of generations. Phylogeographical discordance occurred between nuclear and mitochondrial loci as might be expected during the early stages of species formation. Because the geographic distance between divergent populations is small and no obvious dispersal barriers exist in this region, we suggest the divergence might reflect ecologically driven selection mediated by environmental correlates of the depth gradient. As inferred for numerous shallow-water species, environmental gradients that parallel changes in depth may play a key role in the genesis and adaptive radiation of the deep-water fauna. © 2013 Jennings et al. Text North Atlantic DataCite Metadata Store (German National Library of Science and Technology) Jennings ENVELOPE(72.556,72.556,-70.145,-70.145) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Animals Atlantic Ocean Bayes Theorem Bivalvia Cell Nucleus DNA, Mitochondrial Ecosystem Gene Flow Genetic Speciation Genetic Variation Multilocus Sequence Typing Phylogeny |
spellingShingle |
Animals Atlantic Ocean Bayes Theorem Bivalvia Cell Nucleus DNA, Mitochondrial Ecosystem Gene Flow Genetic Speciation Genetic Variation Multilocus Sequence Typing Phylogeny Unkn Unknown Population Differentiation and Species Formation in the Deep Sea: The Potential Role of Environmental Gradients and Depth |
topic_facet |
Animals Atlantic Ocean Bayes Theorem Bivalvia Cell Nucleus DNA, Mitochondrial Ecosystem Gene Flow Genetic Speciation Genetic Variation Multilocus Sequence Typing Phylogeny |
description |
Ecological speciation probably plays a more prominent role in diversification than previously thought, particularly in marine ecosystems where dispersal potential is great and where few obvious barriers to gene flow exist. This may be especially true in the deep sea where allopatric speciation seems insufficient to account for the rich and largely endemic fauna. Ecologically driven population differentiation and speciation are likely to be most prevalent along environmental gradients, such as those attending changes in depth. We quantified patterns of genetic variation along a depth gradient (1600-3800m) in the western North Atlantic for a protobranch bivalve (Nucula atacellana) to test for population divergence. Multilocus analyses indicated a sharp discontinuity across a narrow depth range, with extremely low gene flow inferred between shallow and deep populations for thousands of generations. Phylogeographical discordance occurred between nuclear and mitochondrial loci as might be expected during the early stages of species formation. Because the geographic distance between divergent populations is small and no obvious dispersal barriers exist in this region, we suggest the divergence might reflect ecologically driven selection mediated by environmental correlates of the depth gradient. As inferred for numerous shallow-water species, environmental gradients that parallel changes in depth may play a key role in the genesis and adaptive radiation of the deep-water fauna. © 2013 Jennings et al. |
format |
Text |
author |
Unkn Unknown |
author_facet |
Unkn Unknown |
author_sort |
Unkn Unknown |
title |
Population Differentiation and Species Formation in the Deep Sea: The Potential Role of Environmental Gradients and Depth |
title_short |
Population Differentiation and Species Formation in the Deep Sea: The Potential Role of Environmental Gradients and Depth |
title_full |
Population Differentiation and Species Formation in the Deep Sea: The Potential Role of Environmental Gradients and Depth |
title_fullStr |
Population Differentiation and Species Formation in the Deep Sea: The Potential Role of Environmental Gradients and Depth |
title_full_unstemmed |
Population Differentiation and Species Formation in the Deep Sea: The Potential Role of Environmental Gradients and Depth |
title_sort |
population differentiation and species formation in the deep sea: the potential role of environmental gradients and depth |
publisher |
My University |
publishDate |
2013 |
url |
https://dx.doi.org/10.34944/dspace/5345 https://scholarshare.temple.edu/handle/20.500.12613/5363 |
long_lat |
ENVELOPE(72.556,72.556,-70.145,-70.145) |
geographic |
Jennings |
geographic_facet |
Jennings |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_rights |
CC BY |
op_doi |
https://doi.org/10.34944/dspace/5345 |
_version_ |
1766133437907861504 |