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Age and growth of one of the world’s largest carnivorous gastropods, the Florida Horse Conch, Triplofusus giganteus (Kiener, 1840), a target of unregulated, intense harvest

The Florida Horse Conch, Triplofusus giganteus, one of the largest marine gastropods in the world, has been intensely exploited by shell collectors, curio dealers, and commercial harvest for over a century and is now in decline. Effective management of horse conch populations requires better data on...

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Autores principales: Herbert, Gregory S., Geiger, Stephen P., Hesterberg, Stephen G., Seiden, Nicole, Rogers, Jaime A., Harke, Ryan M., Šala, Martin, West, Kaydee J., Goddard, Ethan A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8985988/
https://www.ncbi.nlm.nih.gov/pubmed/35385498
http://dx.doi.org/10.1371/journal.pone.0265095
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author Herbert, Gregory S.
Geiger, Stephen P.
Hesterberg, Stephen G.
Seiden, Nicole
Rogers, Jaime A.
Harke, Ryan M.
Šala, Martin
West, Kaydee J.
Goddard, Ethan A.
author_facet Herbert, Gregory S.
Geiger, Stephen P.
Hesterberg, Stephen G.
Seiden, Nicole
Rogers, Jaime A.
Harke, Ryan M.
Šala, Martin
West, Kaydee J.
Goddard, Ethan A.
author_sort Herbert, Gregory S.
collection PubMed
description The Florida Horse Conch, Triplofusus giganteus, one of the largest marine gastropods in the world, has been intensely exploited by shell collectors, curio dealers, and commercial harvest for over a century and is now in decline. Effective management of horse conch populations requires better data on commercial and recreational harvest intensities but also on the species’ intrinsic capacity to recover. Here, we use stable oxygen and carbon isotope sclerochronology to investigate the horse conch’s life history, including its maximum life span, growth rates, age at first spawning, and number of lifetime spawning seasons. The largest two shells studied (460 and 475 mm linear shell length) grew for 13 and 11 years, respectively. Growth curves for these shells, extrapolated out to the length of the record size shell (606 mm linear shell length) predict a maximum age of just 16 years. Carbon isotopes and field photographs of spawning females suggest that females mature relatively late in life. However, the largest horse conchs remaining in the wild are also smaller and younger than those studied here. Thus, the largest females left in the wild could have few lifetime spawning events. High fecundity can buffer horse conchs from overfishing but only if females reach spawning age and reproductive-age females are protected. Our study highlights the usefulness of stable isotope sclerochronology for characterizing the life histories of molluscan species now too uncommon to study through traditional mark and recapture approaches.
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spelling pubmed-89859882022-04-07 Age and growth of one of the world’s largest carnivorous gastropods, the Florida Horse Conch, Triplofusus giganteus (Kiener, 1840), a target of unregulated, intense harvest Herbert, Gregory S. Geiger, Stephen P. Hesterberg, Stephen G. Seiden, Nicole Rogers, Jaime A. Harke, Ryan M. Šala, Martin West, Kaydee J. Goddard, Ethan A. PLoS One Research Article The Florida Horse Conch, Triplofusus giganteus, one of the largest marine gastropods in the world, has been intensely exploited by shell collectors, curio dealers, and commercial harvest for over a century and is now in decline. Effective management of horse conch populations requires better data on commercial and recreational harvest intensities but also on the species’ intrinsic capacity to recover. Here, we use stable oxygen and carbon isotope sclerochronology to investigate the horse conch’s life history, including its maximum life span, growth rates, age at first spawning, and number of lifetime spawning seasons. The largest two shells studied (460 and 475 mm linear shell length) grew for 13 and 11 years, respectively. Growth curves for these shells, extrapolated out to the length of the record size shell (606 mm linear shell length) predict a maximum age of just 16 years. Carbon isotopes and field photographs of spawning females suggest that females mature relatively late in life. However, the largest horse conchs remaining in the wild are also smaller and younger than those studied here. Thus, the largest females left in the wild could have few lifetime spawning events. High fecundity can buffer horse conchs from overfishing but only if females reach spawning age and reproductive-age females are protected. Our study highlights the usefulness of stable isotope sclerochronology for characterizing the life histories of molluscan species now too uncommon to study through traditional mark and recapture approaches. Public Library of Science 2022-04-06 /pmc/articles/PMC8985988/ /pubmed/35385498 http://dx.doi.org/10.1371/journal.pone.0265095 Text en © 2022 Herbert et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Herbert, Gregory S.
Geiger, Stephen P.
Hesterberg, Stephen G.
Seiden, Nicole
Rogers, Jaime A.
Harke, Ryan M.
Šala, Martin
West, Kaydee J.
Goddard, Ethan A.
Age and growth of one of the world’s largest carnivorous gastropods, the Florida Horse Conch, Triplofusus giganteus (Kiener, 1840), a target of unregulated, intense harvest
title Age and growth of one of the world’s largest carnivorous gastropods, the Florida Horse Conch, Triplofusus giganteus (Kiener, 1840), a target of unregulated, intense harvest
title_full Age and growth of one of the world’s largest carnivorous gastropods, the Florida Horse Conch, Triplofusus giganteus (Kiener, 1840), a target of unregulated, intense harvest
title_fullStr Age and growth of one of the world’s largest carnivorous gastropods, the Florida Horse Conch, Triplofusus giganteus (Kiener, 1840), a target of unregulated, intense harvest
title_full_unstemmed Age and growth of one of the world’s largest carnivorous gastropods, the Florida Horse Conch, Triplofusus giganteus (Kiener, 1840), a target of unregulated, intense harvest
title_short Age and growth of one of the world’s largest carnivorous gastropods, the Florida Horse Conch, Triplofusus giganteus (Kiener, 1840), a target of unregulated, intense harvest
title_sort age and growth of one of the world’s largest carnivorous gastropods, the florida horse conch, triplofusus giganteus (kiener, 1840), a target of unregulated, intense harvest
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8985988/
https://www.ncbi.nlm.nih.gov/pubmed/35385498
http://dx.doi.org/10.1371/journal.pone.0265095
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