Geometric Morphological Differences Distinguish Populations of Scup in the Northwestern Atlantic Ocean
Scup Stenotomus chrysops, a commercially important marine species, are distributed from Nova Scotia to south Florida, and may represent morphologically distinct populations across their range. It was determined whether there were morphological differences between a North Atlantic Bight (NAB) populat...
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American Fisheries Society
2009
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ftbioone:10.1577/C08-023.1 2023-07-30T04:05:28+02:00 Geometric Morphological Differences Distinguish Populations of Scup in the Northwestern Atlantic Ocean Joseph W. Love Peter D. Chase Joseph W. Love Peter D. Chase world 2009-02-05 text/HTML https://doi.org/10.1577/C08-023.1 en eng American Fisheries Society doi:10.1577/C08-023.1 All rights reserved. https://doi.org/10.1577/C08-023.1 Text 2009 ftbioone https://doi.org/10.1577/C08-023.1 2023-07-09T09:33:16Z Scup Stenotomus chrysops, a commercially important marine species, are distributed from Nova Scotia to south Florida, and may represent morphologically distinct populations across their range. It was determined whether there were morphological differences between a North Atlantic Bight (NAB) population (41°N) and two South Atlantic Bight (SAB) populations (30°N and 32°N) of this species from April 2005 to July 2005, when the populations had formed spawning groups. Morphology was compared among populations by means of a geometric, landmark-based analysis of morphological and meristic traits for 180 individuals that were sexed and staged to maturity. A backward, stepwise discriminant functions analysis (DFA) produced a model that generated DFA scores that differed significantly between the NAB and SAB populations. Forehead and body depth dimensions differed among populations but not sexes. The DFA model predicted similar scores for 32 new NAB individuals and 31 new SAB individuals; however, scores were consistently underpredicted for the NAB individuals and overpredicted for the SAB individuals. We concluded that distinct northern and southern populations support a two-stock or two-species hypothesis; however, it is unclear whether this stock structure is related to reproductive or other life history traits. Either phenotypic plasticity or divergent selection may explain the morphological dissimilarities among these populations, but their influence on individual fitness remains unknown. Text North Atlantic BioOne Online Journals Marine and Coastal Fisheries 1 1 22 28 |
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Open Polar |
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BioOne Online Journals |
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ftbioone |
language |
English |
description |
Scup Stenotomus chrysops, a commercially important marine species, are distributed from Nova Scotia to south Florida, and may represent morphologically distinct populations across their range. It was determined whether there were morphological differences between a North Atlantic Bight (NAB) population (41°N) and two South Atlantic Bight (SAB) populations (30°N and 32°N) of this species from April 2005 to July 2005, when the populations had formed spawning groups. Morphology was compared among populations by means of a geometric, landmark-based analysis of morphological and meristic traits for 180 individuals that were sexed and staged to maturity. A backward, stepwise discriminant functions analysis (DFA) produced a model that generated DFA scores that differed significantly between the NAB and SAB populations. Forehead and body depth dimensions differed among populations but not sexes. The DFA model predicted similar scores for 32 new NAB individuals and 31 new SAB individuals; however, scores were consistently underpredicted for the NAB individuals and overpredicted for the SAB individuals. We concluded that distinct northern and southern populations support a two-stock or two-species hypothesis; however, it is unclear whether this stock structure is related to reproductive or other life history traits. Either phenotypic plasticity or divergent selection may explain the morphological dissimilarities among these populations, but their influence on individual fitness remains unknown. |
author2 |
Joseph W. Love Peter D. Chase |
format |
Text |
author |
Joseph W. Love Peter D. Chase |
spellingShingle |
Joseph W. Love Peter D. Chase Geometric Morphological Differences Distinguish Populations of Scup in the Northwestern Atlantic Ocean |
author_facet |
Joseph W. Love Peter D. Chase |
author_sort |
Joseph W. Love |
title |
Geometric Morphological Differences Distinguish Populations of Scup in the Northwestern Atlantic Ocean |
title_short |
Geometric Morphological Differences Distinguish Populations of Scup in the Northwestern Atlantic Ocean |
title_full |
Geometric Morphological Differences Distinguish Populations of Scup in the Northwestern Atlantic Ocean |
title_fullStr |
Geometric Morphological Differences Distinguish Populations of Scup in the Northwestern Atlantic Ocean |
title_full_unstemmed |
Geometric Morphological Differences Distinguish Populations of Scup in the Northwestern Atlantic Ocean |
title_sort |
geometric morphological differences distinguish populations of scup in the northwestern atlantic ocean |
publisher |
American Fisheries Society |
publishDate |
2009 |
url |
https://doi.org/10.1577/C08-023.1 |
op_coverage |
world |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
https://doi.org/10.1577/C08-023.1 |
op_relation |
doi:10.1577/C08-023.1 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1577/C08-023.1 |
container_title |
Marine and Coastal Fisheries |
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1 |
container_issue |
1 |
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22 |
op_container_end_page |
28 |
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1772817407294832640 |