Phenotypic and genetic variation within the Cricotopus sylvestris species-group (Diptera, Chironomidae), across a Nearctic - Palaearctic gradient
Intraspecific variation sometimes obscures species boundaries and makes identification of certain Chironomidae difficult. This is true for many species in the genus Cricotopus. We used DNA barcode data and multivariate statistical analyses to investigate which phenotypic characters in populations of...
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2488388 2023-05-15T17:43:33+02:00 Phenotypic and genetic variation within the Cricotopus sylvestris species-group (Diptera, Chironomidae), across a Nearctic - Palaearctic gradient Gresens, Susan E. Stur, Elisabeth Ekrem, Torbjørn 2012 http://hdl.handle.net/11250/2488388 https://doi.org/10.5324/fn.v31i0.1417 eng eng NTNU Open Access Journals http://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/1417/1409 Fauna Norvegica. 2012, 31, 137-149. urn:issn:1502-4873 http://hdl.handle.net/11250/2488388 https://doi.org/10.5324/fn.v31i0.1417 cristin:953152 Navngivelse-Ikkekommersiell 4.0 Internasjonal http://creativecommons.org/licenses/by-nc/4.0/deed.no CC-BY-NC 137-149 31 Fauna Norvegica Journal article Peer reviewed 2012 ftntnutrondheimi https://doi.org/10.5324/fn.v31i0.1417 2019-09-17T06:53:42Z Intraspecific variation sometimes obscures species boundaries and makes identification of certain Chironomidae difficult. This is true for many species in the genus Cricotopus. We used DNA barcode data and multivariate statistical analyses to investigate which phenotypic characters in populations of the Cricotopus sylvestris species-group are useful for species identification. Specimens collected across a broad latitudinal range from the Southwest United States through subarctic Canada to northern Norway formed nine distinct barcode clusters. Body size of adult flies decreased by 51% from the northern to southernmost populations. Meristic characters in wings and legs were strongly related to overall body size, and related morphometric ratios were not species specific. Antennal ratio increased significantly with body size, thus limiting its value in species delimitation. Non-metric ordinations of setal and coloration pattern data were characteristic for most species in the sylvestris-group. DNA barcode data worked well in separating morphologically different populations, except for the case of C. (I.) sylvestris and C. (I.) trifasciatus, which were distinguished by ordination of color pattern, but not by barcoding data. These two species appeared closely related, and we conclude that sequence data from neutral nuclear markers will be necessary to determine if these are genetically distinct species, or whether there is merely a high level of environmental plasticity in pigmentation within this geographically widespread barcode cluster. publishedVersion Copyright The Author(s) 2012. This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. Article in Journal/Newspaper Northern Norway Subarctic NTNU Open Archive (Norwegian University of Science and Technology) Canada Norway Fauna norvegica 31 0 |
institution |
Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
description |
Intraspecific variation sometimes obscures species boundaries and makes identification of certain Chironomidae difficult. This is true for many species in the genus Cricotopus. We used DNA barcode data and multivariate statistical analyses to investigate which phenotypic characters in populations of the Cricotopus sylvestris species-group are useful for species identification. Specimens collected across a broad latitudinal range from the Southwest United States through subarctic Canada to northern Norway formed nine distinct barcode clusters. Body size of adult flies decreased by 51% from the northern to southernmost populations. Meristic characters in wings and legs were strongly related to overall body size, and related morphometric ratios were not species specific. Antennal ratio increased significantly with body size, thus limiting its value in species delimitation. Non-metric ordinations of setal and coloration pattern data were characteristic for most species in the sylvestris-group. DNA barcode data worked well in separating morphologically different populations, except for the case of C. (I.) sylvestris and C. (I.) trifasciatus, which were distinguished by ordination of color pattern, but not by barcoding data. These two species appeared closely related, and we conclude that sequence data from neutral nuclear markers will be necessary to determine if these are genetically distinct species, or whether there is merely a high level of environmental plasticity in pigmentation within this geographically widespread barcode cluster. publishedVersion Copyright The Author(s) 2012. This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
format |
Article in Journal/Newspaper |
author |
Gresens, Susan E. Stur, Elisabeth Ekrem, Torbjørn |
spellingShingle |
Gresens, Susan E. Stur, Elisabeth Ekrem, Torbjørn Phenotypic and genetic variation within the Cricotopus sylvestris species-group (Diptera, Chironomidae), across a Nearctic - Palaearctic gradient |
author_facet |
Gresens, Susan E. Stur, Elisabeth Ekrem, Torbjørn |
author_sort |
Gresens, Susan E. |
title |
Phenotypic and genetic variation within the Cricotopus sylvestris species-group (Diptera, Chironomidae), across a Nearctic - Palaearctic gradient |
title_short |
Phenotypic and genetic variation within the Cricotopus sylvestris species-group (Diptera, Chironomidae), across a Nearctic - Palaearctic gradient |
title_full |
Phenotypic and genetic variation within the Cricotopus sylvestris species-group (Diptera, Chironomidae), across a Nearctic - Palaearctic gradient |
title_fullStr |
Phenotypic and genetic variation within the Cricotopus sylvestris species-group (Diptera, Chironomidae), across a Nearctic - Palaearctic gradient |
title_full_unstemmed |
Phenotypic and genetic variation within the Cricotopus sylvestris species-group (Diptera, Chironomidae), across a Nearctic - Palaearctic gradient |
title_sort |
phenotypic and genetic variation within the cricotopus sylvestris species-group (diptera, chironomidae), across a nearctic - palaearctic gradient |
publisher |
NTNU Open Access Journals |
publishDate |
2012 |
url |
http://hdl.handle.net/11250/2488388 https://doi.org/10.5324/fn.v31i0.1417 |
geographic |
Canada Norway |
geographic_facet |
Canada Norway |
genre |
Northern Norway Subarctic |
genre_facet |
Northern Norway Subarctic |
op_source |
137-149 31 Fauna Norvegica |
op_relation |
http://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/1417/1409 Fauna Norvegica. 2012, 31, 137-149. urn:issn:1502-4873 http://hdl.handle.net/11250/2488388 https://doi.org/10.5324/fn.v31i0.1417 cristin:953152 |
op_rights |
Navngivelse-Ikkekommersiell 4.0 Internasjonal http://creativecommons.org/licenses/by-nc/4.0/deed.no |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.5324/fn.v31i0.1417 |
container_title |
Fauna norvegica |
container_volume |
31 |
container_issue |
0 |
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1766145655825235968 |