Drivers of growth in strong year classes of the deepwater redfish ( Sebastes mentella) population from the Gulf of St. Lawrence derived from otolith increment‐based growth chronologies
Abstract The case of the deepwater redfish ( Sebastes mentella ) in the Gulf of St. Lawrence (GSL) is a compelling example of drastic fluctuations in annual recruitment strength, characteristic of spasmodic stocks. After three decades of low abundance, the emergence of three consecutive strong year...
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Online Access: | http://dx.doi.org/10.1111/jfb.15903 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.15903 |
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crwiley:10.1111/jfb.15903 2024-09-15T18:35:41+00:00 Drivers of growth in strong year classes of the deepwater redfish ( Sebastes mentella) population from the Gulf of St. Lawrence derived from otolith increment‐based growth chronologies Coussau, Lola Morissette, Olivier Robert, Dominique Sirois, Pascal Fonds de recherche du Québec – Nature et technologies 2024 http://dx.doi.org/10.1111/jfb.15903 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.15903 en eng Wiley http://creativecommons.org/licenses/by-nc/4.0/ Journal of Fish Biology ISSN 0022-1112 1095-8649 journal-article 2024 crwiley https://doi.org/10.1111/jfb.15903 2024-08-20T04:13:58Z Abstract The case of the deepwater redfish ( Sebastes mentella ) in the Gulf of St. Lawrence (GSL) is a compelling example of drastic fluctuations in annual recruitment strength, characteristic of spasmodic stocks. After three decades of low abundance, the emergence of three consecutive strong year classes in 2011–2013 resulted in an unprecedented increase in biomass. In spasmodic stocks such as GSL redfish, strong year classes sustain both the biomass and catch for decades. Therefore, understanding the growth dynamics of these cohorts is essential. In the present study, we reconstructed the annual growth rates of redfish using otolith increment‐based annual chronology and investigated the drivers of growth variation in redfish strong year classes of the early 2010s and early 1980s. Stock biomass was identified as the main extrinsic driver of redfish growth, suggesting intense competition for food at high conspecific density. Warming of deep waters in the GSL, where adult redfish settle, positively correlated with individual growth. However, recent warming of the cold intermediate layer showed a negative correlation with redfish growth, likely related to the shrinking of the habitat this water mass provides for various redfish cold‐water prey rather than to a direct effect of temperature. Reconstruction of redfish annual growth trajectories from birth to capture emphasized the importance of carryover effects in the growth potential of strong year classes. This work provided an important first outlook of the factors driving growth variation in GSL redfish spasmodic stock and explored midterm consequences of density‐dependent pressures on biological parameters of the population. Article in Journal/Newspaper Sebastes mentella Wiley Online Library Journal of Fish Biology |
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Wiley Online Library |
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English |
description |
Abstract The case of the deepwater redfish ( Sebastes mentella ) in the Gulf of St. Lawrence (GSL) is a compelling example of drastic fluctuations in annual recruitment strength, characteristic of spasmodic stocks. After three decades of low abundance, the emergence of three consecutive strong year classes in 2011–2013 resulted in an unprecedented increase in biomass. In spasmodic stocks such as GSL redfish, strong year classes sustain both the biomass and catch for decades. Therefore, understanding the growth dynamics of these cohorts is essential. In the present study, we reconstructed the annual growth rates of redfish using otolith increment‐based annual chronology and investigated the drivers of growth variation in redfish strong year classes of the early 2010s and early 1980s. Stock biomass was identified as the main extrinsic driver of redfish growth, suggesting intense competition for food at high conspecific density. Warming of deep waters in the GSL, where adult redfish settle, positively correlated with individual growth. However, recent warming of the cold intermediate layer showed a negative correlation with redfish growth, likely related to the shrinking of the habitat this water mass provides for various redfish cold‐water prey rather than to a direct effect of temperature. Reconstruction of redfish annual growth trajectories from birth to capture emphasized the importance of carryover effects in the growth potential of strong year classes. This work provided an important first outlook of the factors driving growth variation in GSL redfish spasmodic stock and explored midterm consequences of density‐dependent pressures on biological parameters of the population. |
author2 |
Fonds de recherche du Québec – Nature et technologies |
format |
Article in Journal/Newspaper |
author |
Coussau, Lola Morissette, Olivier Robert, Dominique Sirois, Pascal |
spellingShingle |
Coussau, Lola Morissette, Olivier Robert, Dominique Sirois, Pascal Drivers of growth in strong year classes of the deepwater redfish ( Sebastes mentella) population from the Gulf of St. Lawrence derived from otolith increment‐based growth chronologies |
author_facet |
Coussau, Lola Morissette, Olivier Robert, Dominique Sirois, Pascal |
author_sort |
Coussau, Lola |
title |
Drivers of growth in strong year classes of the deepwater redfish ( Sebastes mentella) population from the Gulf of St. Lawrence derived from otolith increment‐based growth chronologies |
title_short |
Drivers of growth in strong year classes of the deepwater redfish ( Sebastes mentella) population from the Gulf of St. Lawrence derived from otolith increment‐based growth chronologies |
title_full |
Drivers of growth in strong year classes of the deepwater redfish ( Sebastes mentella) population from the Gulf of St. Lawrence derived from otolith increment‐based growth chronologies |
title_fullStr |
Drivers of growth in strong year classes of the deepwater redfish ( Sebastes mentella) population from the Gulf of St. Lawrence derived from otolith increment‐based growth chronologies |
title_full_unstemmed |
Drivers of growth in strong year classes of the deepwater redfish ( Sebastes mentella) population from the Gulf of St. Lawrence derived from otolith increment‐based growth chronologies |
title_sort |
drivers of growth in strong year classes of the deepwater redfish ( sebastes mentella) population from the gulf of st. lawrence derived from otolith increment‐based growth chronologies |
publisher |
Wiley |
publishDate |
2024 |
url |
http://dx.doi.org/10.1111/jfb.15903 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.15903 |
genre |
Sebastes mentella |
genre_facet |
Sebastes mentella |
op_source |
Journal of Fish Biology ISSN 0022-1112 1095-8649 |
op_rights |
http://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.1111/jfb.15903 |
container_title |
Journal of Fish Biology |
_version_ |
1810478881051770880 |