Data from: Evolution and origin of sympatric shallow-water morphotypes of Lake Trout, Salvelinus namaycush, in Canada's Great Bear Lake
AbstractRange expansion in north-temperate fishes subsequent to the retreat of the Wisconsinan glaciers has resulted in the rapid colonization of previously unexploited, heterogeneous habitats and, in many situations, secondary contact among conspecific lineages that were once previously isolated. S...
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dataone:sha256:970ff53974f069d9602362f27c3dad529601f5f2aa73c764cf54bdfd298660ad 2024-10-03T18:46:06+00:00 Data from: Evolution and origin of sympatric shallow-water morphotypes of Lake Trout, Salvelinus namaycush, in Canada's Great Bear Lake Harris, Les N. Chavarie, Louise Bajno, Robert Howland, Kimberly L. Wiley, Simon H. Tonn, William M. Taylor, Eric B. 2021-05-19T00:00:00Z https://search.dataone.org/view/sha256:970ff53974f069d9602362f27c3dad529601f5f2aa73c764cf54bdfd298660ad unknown sympatric 2002-2010 post-glacial dispersal morphotypes Other Salvelinus namaycush lake trout allopatric Dataset 2021 dataone:urn:node:BOREALIS 2024-10-03T18:17:47Z AbstractRange expansion in north-temperate fishes subsequent to the retreat of the Wisconsinan glaciers has resulted in the rapid colonization of previously unexploited, heterogeneous habitats and, in many situations, secondary contact among conspecific lineages that were once previously isolated. Such ecological opportunity coupled with reduced competition likely promoted morphological and genetic differentiation within and among post-glacial fish populations. Discrete morphological forms existing in sympatry, for example, have now been described in many species, yet few studies have directly assessed the association between morphological and genetic variation. Morphotypes of Lake Trout, Salvelinus namaycush, are found in several large-lake systems including Great Bear Lake (GBL), Northwest Territories, Canada, where several shallow-water forms are known. Here, we assess microsatellite and mitochondrial DNA variation among four morphotypes of Lake Trout from the five distinct arms of GBL, and also from locations outside of this system to evaluate several hypotheses concerning the evolution of morphological variation in this species. Our data indicate that morphotypes of Lake Trout from GBL are genetically differentiated from one another, yet the morphotypes are still genetically more similar to one another compared with populations from outside of this system. Furthermore, our data suggest that Lake Trout colonized GBL following dispersal from a single glacial refugium (the Mississippian) and support an intra-lake model of divergence. Overall, our study provides insights into the origins of morphological and genetic variation in post-glacial populations of fishes and provides benchmarks important for monitoring Lake Trout biodiversity in a region thought to be disproportionately susceptible to impacts from climate change. Dataset glacier* Great Bear Lake Northwest Territories Unknown Northwest Territories Canada Great Bear Lake ENVELOPE(-120.753,-120.753,65.834,65.834) Namaycush Lake ENVELOPE(-108.367,-108.367,70.808,70.808) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
dataone:urn:node:BOREALIS |
language |
unknown |
topic |
sympatric 2002-2010 post-glacial dispersal morphotypes Other Salvelinus namaycush lake trout allopatric |
spellingShingle |
sympatric 2002-2010 post-glacial dispersal morphotypes Other Salvelinus namaycush lake trout allopatric Harris, Les N. Chavarie, Louise Bajno, Robert Howland, Kimberly L. Wiley, Simon H. Tonn, William M. Taylor, Eric B. Data from: Evolution and origin of sympatric shallow-water morphotypes of Lake Trout, Salvelinus namaycush, in Canada's Great Bear Lake |
topic_facet |
sympatric 2002-2010 post-glacial dispersal morphotypes Other Salvelinus namaycush lake trout allopatric |
description |
AbstractRange expansion in north-temperate fishes subsequent to the retreat of the Wisconsinan glaciers has resulted in the rapid colonization of previously unexploited, heterogeneous habitats and, in many situations, secondary contact among conspecific lineages that were once previously isolated. Such ecological opportunity coupled with reduced competition likely promoted morphological and genetic differentiation within and among post-glacial fish populations. Discrete morphological forms existing in sympatry, for example, have now been described in many species, yet few studies have directly assessed the association between morphological and genetic variation. Morphotypes of Lake Trout, Salvelinus namaycush, are found in several large-lake systems including Great Bear Lake (GBL), Northwest Territories, Canada, where several shallow-water forms are known. Here, we assess microsatellite and mitochondrial DNA variation among four morphotypes of Lake Trout from the five distinct arms of GBL, and also from locations outside of this system to evaluate several hypotheses concerning the evolution of morphological variation in this species. Our data indicate that morphotypes of Lake Trout from GBL are genetically differentiated from one another, yet the morphotypes are still genetically more similar to one another compared with populations from outside of this system. Furthermore, our data suggest that Lake Trout colonized GBL following dispersal from a single glacial refugium (the Mississippian) and support an intra-lake model of divergence. Overall, our study provides insights into the origins of morphological and genetic variation in post-glacial populations of fishes and provides benchmarks important for monitoring Lake Trout biodiversity in a region thought to be disproportionately susceptible to impacts from climate change. |
format |
Dataset |
author |
Harris, Les N. Chavarie, Louise Bajno, Robert Howland, Kimberly L. Wiley, Simon H. Tonn, William M. Taylor, Eric B. |
author_facet |
Harris, Les N. Chavarie, Louise Bajno, Robert Howland, Kimberly L. Wiley, Simon H. Tonn, William M. Taylor, Eric B. |
author_sort |
Harris, Les N. |
title |
Data from: Evolution and origin of sympatric shallow-water morphotypes of Lake Trout, Salvelinus namaycush, in Canada's Great Bear Lake |
title_short |
Data from: Evolution and origin of sympatric shallow-water morphotypes of Lake Trout, Salvelinus namaycush, in Canada's Great Bear Lake |
title_full |
Data from: Evolution and origin of sympatric shallow-water morphotypes of Lake Trout, Salvelinus namaycush, in Canada's Great Bear Lake |
title_fullStr |
Data from: Evolution and origin of sympatric shallow-water morphotypes of Lake Trout, Salvelinus namaycush, in Canada's Great Bear Lake |
title_full_unstemmed |
Data from: Evolution and origin of sympatric shallow-water morphotypes of Lake Trout, Salvelinus namaycush, in Canada's Great Bear Lake |
title_sort |
data from: evolution and origin of sympatric shallow-water morphotypes of lake trout, salvelinus namaycush, in canada's great bear lake |
publishDate |
2021 |
url |
https://search.dataone.org/view/sha256:970ff53974f069d9602362f27c3dad529601f5f2aa73c764cf54bdfd298660ad |
long_lat |
ENVELOPE(-120.753,-120.753,65.834,65.834) ENVELOPE(-108.367,-108.367,70.808,70.808) |
geographic |
Northwest Territories Canada Great Bear Lake Namaycush Lake |
geographic_facet |
Northwest Territories Canada Great Bear Lake Namaycush Lake |
genre |
glacier* Great Bear Lake Northwest Territories |
genre_facet |
glacier* Great Bear Lake Northwest Territories |
_version_ |
1811924308435402752 |