Size-dependent change in body shape and its possible ecological role in the Patagonian squid (Doryteuthis gahi) in the Southwest Atlantic
17 pages, 4 tables, 9 figures Cephalopods are a versatile group with several mechanisms in place to ensure the success of future generations. The Patagonian long-finned squid (Doryteuthis gahi) populations on the southern Patagonian shelf are believed to be genetically homogenous, but the mechanisms...
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ftcsic:oai:digital.csic.es:10261/180359 2024-02-11T10:03:23+01:00 Size-dependent change in body shape and its possible ecological role in the Patagonian squid (Doryteuthis gahi) in the Southwest Atlantic Jones, Jessica B. Pierce, Graham J. Saborido-Rey, Fran Brickle, Paul Kuepper, Frithjof C. Shcherbich, Zhanna N. Arkhipkin, A. 2019 http://hdl.handle.net/10261/180359 en eng Springer Postprint https ://doi.org/10.1007/s0022 7-019-3501-9 Sí Marine Biology 166: 54 (2019) 0025-3162 http://hdl.handle.net/10261/180359 10.1007/s0022 7-019-3501-9 1432-1793 open artículo http://purl.org/coar/resource_type/c_6501 2019 ftcsic https://doi.org/10.1007/s0022 2024-01-16T10:38:27Z 17 pages, 4 tables, 9 figures Cephalopods are a versatile group with several mechanisms in place to ensure the success of future generations. The Patagonian long-finned squid (Doryteuthis gahi) populations on the southern Patagonian shelf are believed to be genetically homogenous, but the mechanisms connecting them geographically and temporally are unresolved. Individual growth is highly variable within cephalopod populations and is likely to affect individual patterns of migration and, thus, population connectivity as a whole. Therefore, this study aimed to make inferences about population structure by analysing the size at which individuals were mature and aimed to describe the intrapopulation growth (allometric) trajectories of body shape, using landmark-based geometric morphometric techniques to describe phenotypes. Samples were collected from June 1999 to November 2017 around 52°S and 58°W. Smoothing curves from binomial generalised additive models (GAMs) suggested two size modes of maturity in females and one or multiple modes in males dependent on year and season. There was a gradual elongation of the mantle and an increase in the relative fin size throughout ontogeny. Shape scores from geometric morphometric shape coordinates revealed a continuous non-linear allometric trajectory with a significantly different slope angle for males exceeding 20.1 cm dorsal mantle length (DML). At the extreme of this continuum, the largest ‘super-bull’ form had a substantially more elongated body shape, a heavier fin and a larger fin area compared to the rest of the population, a body shape associated with enhanced swimming performance which may help to maintain population connectivity. The prevalence of these rare super-bulls in the fishery varied widely between years, suggestive of phenotypic plasticity. This study provides evidence that the D. gahi population on the southern Patagonian shelf has a complex population structure with high intraspecific variation This study was supported by funding from the Falkland ... Article in Journal/Newspaper DML Digital.CSIC (Spanish National Research Council) |
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Open Polar |
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Digital.CSIC (Spanish National Research Council) |
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ftcsic |
language |
English |
description |
17 pages, 4 tables, 9 figures Cephalopods are a versatile group with several mechanisms in place to ensure the success of future generations. The Patagonian long-finned squid (Doryteuthis gahi) populations on the southern Patagonian shelf are believed to be genetically homogenous, but the mechanisms connecting them geographically and temporally are unresolved. Individual growth is highly variable within cephalopod populations and is likely to affect individual patterns of migration and, thus, population connectivity as a whole. Therefore, this study aimed to make inferences about population structure by analysing the size at which individuals were mature and aimed to describe the intrapopulation growth (allometric) trajectories of body shape, using landmark-based geometric morphometric techniques to describe phenotypes. Samples were collected from June 1999 to November 2017 around 52°S and 58°W. Smoothing curves from binomial generalised additive models (GAMs) suggested two size modes of maturity in females and one or multiple modes in males dependent on year and season. There was a gradual elongation of the mantle and an increase in the relative fin size throughout ontogeny. Shape scores from geometric morphometric shape coordinates revealed a continuous non-linear allometric trajectory with a significantly different slope angle for males exceeding 20.1 cm dorsal mantle length (DML). At the extreme of this continuum, the largest ‘super-bull’ form had a substantially more elongated body shape, a heavier fin and a larger fin area compared to the rest of the population, a body shape associated with enhanced swimming performance which may help to maintain population connectivity. The prevalence of these rare super-bulls in the fishery varied widely between years, suggestive of phenotypic plasticity. This study provides evidence that the D. gahi population on the southern Patagonian shelf has a complex population structure with high intraspecific variation This study was supported by funding from the Falkland ... |
format |
Article in Journal/Newspaper |
author |
Jones, Jessica B. Pierce, Graham J. Saborido-Rey, Fran Brickle, Paul Kuepper, Frithjof C. Shcherbich, Zhanna N. Arkhipkin, A. |
spellingShingle |
Jones, Jessica B. Pierce, Graham J. Saborido-Rey, Fran Brickle, Paul Kuepper, Frithjof C. Shcherbich, Zhanna N. Arkhipkin, A. Size-dependent change in body shape and its possible ecological role in the Patagonian squid (Doryteuthis gahi) in the Southwest Atlantic |
author_facet |
Jones, Jessica B. Pierce, Graham J. Saborido-Rey, Fran Brickle, Paul Kuepper, Frithjof C. Shcherbich, Zhanna N. Arkhipkin, A. |
author_sort |
Jones, Jessica B. |
title |
Size-dependent change in body shape and its possible ecological role in the Patagonian squid (Doryteuthis gahi) in the Southwest Atlantic |
title_short |
Size-dependent change in body shape and its possible ecological role in the Patagonian squid (Doryteuthis gahi) in the Southwest Atlantic |
title_full |
Size-dependent change in body shape and its possible ecological role in the Patagonian squid (Doryteuthis gahi) in the Southwest Atlantic |
title_fullStr |
Size-dependent change in body shape and its possible ecological role in the Patagonian squid (Doryteuthis gahi) in the Southwest Atlantic |
title_full_unstemmed |
Size-dependent change in body shape and its possible ecological role in the Patagonian squid (Doryteuthis gahi) in the Southwest Atlantic |
title_sort |
size-dependent change in body shape and its possible ecological role in the patagonian squid (doryteuthis gahi) in the southwest atlantic |
publisher |
Springer |
publishDate |
2019 |
url |
http://hdl.handle.net/10261/180359 |
genre |
DML |
genre_facet |
DML |
op_relation |
Postprint https ://doi.org/10.1007/s0022 7-019-3501-9 Sí Marine Biology 166: 54 (2019) 0025-3162 http://hdl.handle.net/10261/180359 10.1007/s0022 7-019-3501-9 1432-1793 |
op_rights |
open |
op_doi |
https://doi.org/10.1007/s0022 |
_version_ |
1790599607355441152 |