Pseudocalanus Copepods in the Bering Sea: Species Identification Intraspecific Diversity and Biogeography

The calanoid copepod genus, Pseudocalanus, is an important secondary producer and widespread throughout the northern hemisphere. While ecologically important, previous work with this genus has been limited due to difficulties in morphometric identification. Here, Pseudocalanus species composition an...

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Main Author: Bailey, Jennifer
Format: Text
Language:unknown
Published: DigitalCommons@URI 2012
Subjects:
Online Access:https://digitalcommons.uri.edu/theses/86
https://doi.org/10.23860/thesis-bailey-jennifer-2012
https://digitalcommons.uri.edu/context/theses/article/1071/viewcontent/Bailey_uri_0186M_10527.pdf
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spelling ftunivrhodeislan:oai:digitalcommons.uri.edu:theses-1071 2023-07-30T04:02:40+02:00 Pseudocalanus Copepods in the Bering Sea: Species Identification Intraspecific Diversity and Biogeography Bailey, Jennifer 2012-01-01T08:00:00Z application/pdf https://digitalcommons.uri.edu/theses/86 https://doi.org/10.23860/thesis-bailey-jennifer-2012 https://digitalcommons.uri.edu/context/theses/article/1071/viewcontent/Bailey_uri_0186M_10527.pdf unknown DigitalCommons@URI https://digitalcommons.uri.edu/theses/86 doi:10.23860/thesis-bailey-jennifer-2012 https://digitalcommons.uri.edu/context/theses/article/1071/viewcontent/Bailey_uri_0186M_10527.pdf Open Access Master's Theses text 2012 ftunivrhodeislan https://doi.org/10.23860/thesis-bailey-jennifer-2012 2023-07-17T18:52:25Z The calanoid copepod genus, Pseudocalanus, is an important secondary producer and widespread throughout the northern hemisphere. While ecologically important, previous work with this genus has been limited due to difficulties in morphometric identification. Here, Pseudocalanus species composition and distribution were examined in the Bering Sea through sequencing of the mitochondrial CO1 gene of 642 individuals from 10 locations. Phylogentic trees of inter- and intra specific diversity demonstrated that in the spring of 2010 (March-June), four species of Pseudocalanus co-existed at various locations across the shelf. Species composition in the middle shelf (50-100 m depth) was significantly different from composition on outer shelf/slope (≥200 m depth). Correlation of species composition with salinity and the chlorophyll maximum depth indicated that environmental factors influence distribution and highlighted the importance of species-specific approaches to ecological research involving the Pseudocalanus genus. Differences between the middle shelf and outer shelf/slope populations extended to the intraspecific level in two of the four species. Although high haplotypic diversity was observed in all Pseudocalanus spp., a weak structure between the middle shelf domain and offshore stations was seen only in P. acuspes and P. minutus. This indicates that while there may currently or previously been some barriers, gene flow is possible across the shelf. Evidence of mixed intraspecific and divided interspecific variations, in addition to correlation with environmental conditions, highlighted the importance of a species-specific approach to future research of this genus and will assist in creating greater accuracy in the modeling of an ecosystem-wide response to climate change. Text Bering Sea Copepods University of Rhode Island: DigitalCommons@URI Bering Sea
institution Open Polar
collection University of Rhode Island: DigitalCommons@URI
op_collection_id ftunivrhodeislan
language unknown
description The calanoid copepod genus, Pseudocalanus, is an important secondary producer and widespread throughout the northern hemisphere. While ecologically important, previous work with this genus has been limited due to difficulties in morphometric identification. Here, Pseudocalanus species composition and distribution were examined in the Bering Sea through sequencing of the mitochondrial CO1 gene of 642 individuals from 10 locations. Phylogentic trees of inter- and intra specific diversity demonstrated that in the spring of 2010 (March-June), four species of Pseudocalanus co-existed at various locations across the shelf. Species composition in the middle shelf (50-100 m depth) was significantly different from composition on outer shelf/slope (≥200 m depth). Correlation of species composition with salinity and the chlorophyll maximum depth indicated that environmental factors influence distribution and highlighted the importance of species-specific approaches to ecological research involving the Pseudocalanus genus. Differences between the middle shelf and outer shelf/slope populations extended to the intraspecific level in two of the four species. Although high haplotypic diversity was observed in all Pseudocalanus spp., a weak structure between the middle shelf domain and offshore stations was seen only in P. acuspes and P. minutus. This indicates that while there may currently or previously been some barriers, gene flow is possible across the shelf. Evidence of mixed intraspecific and divided interspecific variations, in addition to correlation with environmental conditions, highlighted the importance of a species-specific approach to future research of this genus and will assist in creating greater accuracy in the modeling of an ecosystem-wide response to climate change.
format Text
author Bailey, Jennifer
spellingShingle Bailey, Jennifer
Pseudocalanus Copepods in the Bering Sea: Species Identification Intraspecific Diversity and Biogeography
author_facet Bailey, Jennifer
author_sort Bailey, Jennifer
title Pseudocalanus Copepods in the Bering Sea: Species Identification Intraspecific Diversity and Biogeography
title_short Pseudocalanus Copepods in the Bering Sea: Species Identification Intraspecific Diversity and Biogeography
title_full Pseudocalanus Copepods in the Bering Sea: Species Identification Intraspecific Diversity and Biogeography
title_fullStr Pseudocalanus Copepods in the Bering Sea: Species Identification Intraspecific Diversity and Biogeography
title_full_unstemmed Pseudocalanus Copepods in the Bering Sea: Species Identification Intraspecific Diversity and Biogeography
title_sort pseudocalanus copepods in the bering sea: species identification intraspecific diversity and biogeography
publisher DigitalCommons@URI
publishDate 2012
url https://digitalcommons.uri.edu/theses/86
https://doi.org/10.23860/thesis-bailey-jennifer-2012
https://digitalcommons.uri.edu/context/theses/article/1071/viewcontent/Bailey_uri_0186M_10527.pdf
geographic Bering Sea
geographic_facet Bering Sea
genre Bering Sea
Copepods
genre_facet Bering Sea
Copepods
op_source Open Access Master's Theses
op_relation https://digitalcommons.uri.edu/theses/86
doi:10.23860/thesis-bailey-jennifer-2012
https://digitalcommons.uri.edu/context/theses/article/1071/viewcontent/Bailey_uri_0186M_10527.pdf
op_doi https://doi.org/10.23860/thesis-bailey-jennifer-2012
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