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Life history of northern Gulf of Mexico Warsaw grouper Hyporthodus nigritus inferred from otolith radiocarbon analysis

Warsaw grouper, Hyporthodus nigritus, is a western Atlantic Ocean species typically found at depths between 55 and 525 m. It is listed as a species of concern by the U.S. National Marine Fisheries Service and as near threatened by the International Union for the Conservation of Nature. However, litt...

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Autores principales: Barnett, Beverly K., Chanton, Jeffrey P., Ahrens, Robert, Thornton, Laura, Patterson, William F.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6980588/
https://www.ncbi.nlm.nih.gov/pubmed/31978207
http://dx.doi.org/10.1371/journal.pone.0228254
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author Barnett, Beverly K.
Chanton, Jeffrey P.
Ahrens, Robert
Thornton, Laura
Patterson, William F.
author_facet Barnett, Beverly K.
Chanton, Jeffrey P.
Ahrens, Robert
Thornton, Laura
Patterson, William F.
author_sort Barnett, Beverly K.
collection PubMed
description Warsaw grouper, Hyporthodus nigritus, is a western Atlantic Ocean species typically found at depths between 55 and 525 m. It is listed as a species of concern by the U.S. National Marine Fisheries Service and as near threatened by the International Union for the Conservation of Nature. However, little information exists on the species’ life history in the northern Gulf of Mexico (nGOM) and its stock status in that region is currently unknown. Age of nGOM Warsaw grouper was investigated via opaque zone counts in otolith thin sections (max age = 61 y), and then the bomb (14)C chronometer was employed to validate the accuracy of age estimates. Otolith cores (n = 14) were analyzed with accelerator mass spectrometry and resulting Δ(14)C values overlain on a loess regression computed for a regional coral and known-age red snapper Δ(14)C time series. Residual analysis between predicted Δ(14)C values from the loess regression versus Warsaw grouper otolith core Δ(14)C values indicated no significant difference in the two data series. Therefore, the accuracy of otolith-based aging was validated, which enabled growth and longevity estimates to be made for nGOM Warsaw grouper. Dissolved inorganic carbon (DIC) Δ(14)C values collected from the nGOM support the inference that juvenile Warsaw grouper occur in shelf waters (<200 m) since DIC Δ(14)C values in this depth range are enriched in (14)C and similar to the Δ(14)C values from otolith cores. A Bayesian model was fit to fishery-dependent age composition data and produced von Bertalanffy growth function parameters of L(∞) = 1,533 mm, k = 0.14 y(-1), and t(0) = 1.82 y. Fishing mortality also was estimated in the model, which resulted in a ratio of fishing to natural mortality of 5.1:1. Overall, study results indicate Warsaw grouper is a long-lived species that is estimated to have experienced significant overfishing in the nGOM, with the age of most landed fish being <10 y.
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spelling pubmed-69805882020-02-04 Life history of northern Gulf of Mexico Warsaw grouper Hyporthodus nigritus inferred from otolith radiocarbon analysis Barnett, Beverly K. Chanton, Jeffrey P. Ahrens, Robert Thornton, Laura Patterson, William F. PLoS One Research Article Warsaw grouper, Hyporthodus nigritus, is a western Atlantic Ocean species typically found at depths between 55 and 525 m. It is listed as a species of concern by the U.S. National Marine Fisheries Service and as near threatened by the International Union for the Conservation of Nature. However, little information exists on the species’ life history in the northern Gulf of Mexico (nGOM) and its stock status in that region is currently unknown. Age of nGOM Warsaw grouper was investigated via opaque zone counts in otolith thin sections (max age = 61 y), and then the bomb (14)C chronometer was employed to validate the accuracy of age estimates. Otolith cores (n = 14) were analyzed with accelerator mass spectrometry and resulting Δ(14)C values overlain on a loess regression computed for a regional coral and known-age red snapper Δ(14)C time series. Residual analysis between predicted Δ(14)C values from the loess regression versus Warsaw grouper otolith core Δ(14)C values indicated no significant difference in the two data series. Therefore, the accuracy of otolith-based aging was validated, which enabled growth and longevity estimates to be made for nGOM Warsaw grouper. Dissolved inorganic carbon (DIC) Δ(14)C values collected from the nGOM support the inference that juvenile Warsaw grouper occur in shelf waters (<200 m) since DIC Δ(14)C values in this depth range are enriched in (14)C and similar to the Δ(14)C values from otolith cores. A Bayesian model was fit to fishery-dependent age composition data and produced von Bertalanffy growth function parameters of L(∞) = 1,533 mm, k = 0.14 y(-1), and t(0) = 1.82 y. Fishing mortality also was estimated in the model, which resulted in a ratio of fishing to natural mortality of 5.1:1. Overall, study results indicate Warsaw grouper is a long-lived species that is estimated to have experienced significant overfishing in the nGOM, with the age of most landed fish being <10 y. Public Library of Science 2020-01-24 /pmc/articles/PMC6980588/ /pubmed/31978207 http://dx.doi.org/10.1371/journal.pone.0228254 Text en https://creativecommons.org/publicdomain/zero/1.0/ This is an open access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 (https://creativecommons.org/publicdomain/zero/1.0/) public domain dedication.
spellingShingle Research Article
Barnett, Beverly K.
Chanton, Jeffrey P.
Ahrens, Robert
Thornton, Laura
Patterson, William F.
Life history of northern Gulf of Mexico Warsaw grouper Hyporthodus nigritus inferred from otolith radiocarbon analysis
title Life history of northern Gulf of Mexico Warsaw grouper Hyporthodus nigritus inferred from otolith radiocarbon analysis
title_full Life history of northern Gulf of Mexico Warsaw grouper Hyporthodus nigritus inferred from otolith radiocarbon analysis
title_fullStr Life history of northern Gulf of Mexico Warsaw grouper Hyporthodus nigritus inferred from otolith radiocarbon analysis
title_full_unstemmed Life history of northern Gulf of Mexico Warsaw grouper Hyporthodus nigritus inferred from otolith radiocarbon analysis
title_short Life history of northern Gulf of Mexico Warsaw grouper Hyporthodus nigritus inferred from otolith radiocarbon analysis
title_sort life history of northern gulf of mexico warsaw grouper hyporthodus nigritus inferred from otolith radiocarbon analysis
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6980588/
https://www.ncbi.nlm.nih.gov/pubmed/31978207
http://dx.doi.org/10.1371/journal.pone.0228254
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