Sex determination in the oyster Crassostrea gigas - A large longitudinal study of population sex ratios and individual sex changes
International audience Understanding sex determination in the Pacific oyster Crassostrea gigas, a sequential hermaphrodite, can provideprospective on the evolution of sex-determining systems for comparative reproduction from an evolutionaryperspective. Surprisingly, this mechanism is still poorly un...
Published in: | Aquaculture |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2020
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Online Access: | https://hal.archives-ouvertes.fr/hal-02559678 https://hal.archives-ouvertes.fr/hal-02559678/document https://hal.archives-ouvertes.fr/hal-02559678/file/S004484861931926X.pdf https://doi.org/10.1016/j.aquaculture.2019.734555 |
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ftunivnantes:oai:HAL:hal-02559678v1 2023-05-15T15:57:56+02:00 Sex determination in the oyster Crassostrea gigas - A large longitudinal study of population sex ratios and individual sex changes Broquard, Coralie Martinez, Anne-Sophie Maurouard, Elise Lamy, Jean-Baptiste Degremont, Lionel Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) 2020-01 https://hal.archives-ouvertes.fr/hal-02559678 https://hal.archives-ouvertes.fr/hal-02559678/document https://hal.archives-ouvertes.fr/hal-02559678/file/S004484861931926X.pdf https://doi.org/10.1016/j.aquaculture.2019.734555 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.aquaculture.2019.734555 hal-02559678 https://hal.archives-ouvertes.fr/hal-02559678 https://hal.archives-ouvertes.fr/hal-02559678/document https://hal.archives-ouvertes.fr/hal-02559678/file/S004484861931926X.pdf doi:10.1016/j.aquaculture.2019.734555 PII: S0044-8486(19)31926-X http://creativecommons.org/licenses/by-nc/ info:eu-repo/semantics/OpenAccess CC-BY-NC ISSN: 0044-8486 Aquaculture https://hal.archives-ouvertes.fr/hal-02559678 Aquaculture, Elsevier, 2020, 515, pp.734555. ⟨10.1016/j.aquaculture.2019.734555⟩ sex-ratio Sex change Oysters Hermaphroditism Crassostrea gigas [SDV]Life Sciences [q-bio] info:eu-repo/semantics/article Journal articles 2020 ftunivnantes https://doi.org/10.1016/j.aquaculture.2019.734555 2022-07-12T23:12:46Z International audience Understanding sex determination in the Pacific oyster Crassostrea gigas, a sequential hermaphrodite, can provideprospective on the evolution of sex-determining systems for comparative reproduction from an evolutionaryperspective. Surprisingly, this mechanism is still poorly understood. To date, sex ratio and sex change have neverbeen studied at the individual level for a large size group and long-term monitoring. To this purpose, we performed an ambitious individual long-term follow-up (6 years) on a large population (cohort 1: 7488 oysters)produced from wild oysters, as well as for a second population produced from the cohort 1 (cohort 2: 4320oysters). All oysters were individually sexed from 2014 to 2019. For the cohort 1, our results showed a significantly female-biased sex ratio each year, ranging from 61 to 73% for the cohort 1. The proportion of oystersexhibiting sex change between the first two breeding seasons was 34% and decreased each year, ending at 9%between years 5 and 6. From the initial population, 1386 oysters were sexed six years in a row. Among them,58% were sequential hermaphrodites, within which 32% changed sex once (19% protandric and 13% protogynic), 19% twice, 5% three times, 1% four times and 0.1% five times. In contrast, 42% never exhibited a sexchange, within which 34% were potentially true females and 8% potentially true males. However, a logisticregression model indicates that those oysters could experience one sex reversal in subsequent years resulting thatall oysters of our population of C. gigas would be sequential hermaphrodites. Similar results were observed forthe cohort 2, although the proportion of sequential hermaphrodite was higher than the one observed for cohort1. It is supposed that a genetic basis exist for sex change in C. gigas. Our work participates to unravel the barriersexisting about the sequential hermaphroditism, the protandry and the sexual system in C. gigas, still currentlydebated. Article in Journal/Newspaper Crassostrea gigas Pacific oyster Université de Nantes: HAL-UNIV-NANTES Pacific Aquaculture 515 734555 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
sex-ratio Sex change Oysters Hermaphroditism Crassostrea gigas [SDV]Life Sciences [q-bio] |
spellingShingle |
sex-ratio Sex change Oysters Hermaphroditism Crassostrea gigas [SDV]Life Sciences [q-bio] Broquard, Coralie Martinez, Anne-Sophie Maurouard, Elise Lamy, Jean-Baptiste Degremont, Lionel Sex determination in the oyster Crassostrea gigas - A large longitudinal study of population sex ratios and individual sex changes |
topic_facet |
sex-ratio Sex change Oysters Hermaphroditism Crassostrea gigas [SDV]Life Sciences [q-bio] |
description |
International audience Understanding sex determination in the Pacific oyster Crassostrea gigas, a sequential hermaphrodite, can provideprospective on the evolution of sex-determining systems for comparative reproduction from an evolutionaryperspective. Surprisingly, this mechanism is still poorly understood. To date, sex ratio and sex change have neverbeen studied at the individual level for a large size group and long-term monitoring. To this purpose, we performed an ambitious individual long-term follow-up (6 years) on a large population (cohort 1: 7488 oysters)produced from wild oysters, as well as for a second population produced from the cohort 1 (cohort 2: 4320oysters). All oysters were individually sexed from 2014 to 2019. For the cohort 1, our results showed a significantly female-biased sex ratio each year, ranging from 61 to 73% for the cohort 1. The proportion of oystersexhibiting sex change between the first two breeding seasons was 34% and decreased each year, ending at 9%between years 5 and 6. From the initial population, 1386 oysters were sexed six years in a row. Among them,58% were sequential hermaphrodites, within which 32% changed sex once (19% protandric and 13% protogynic), 19% twice, 5% three times, 1% four times and 0.1% five times. In contrast, 42% never exhibited a sexchange, within which 34% were potentially true females and 8% potentially true males. However, a logisticregression model indicates that those oysters could experience one sex reversal in subsequent years resulting thatall oysters of our population of C. gigas would be sequential hermaphrodites. Similar results were observed forthe cohort 2, although the proportion of sequential hermaphrodite was higher than the one observed for cohort1. It is supposed that a genetic basis exist for sex change in C. gigas. Our work participates to unravel the barriersexisting about the sequential hermaphroditism, the protandry and the sexual system in C. gigas, still currentlydebated. |
author2 |
Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) |
format |
Article in Journal/Newspaper |
author |
Broquard, Coralie Martinez, Anne-Sophie Maurouard, Elise Lamy, Jean-Baptiste Degremont, Lionel |
author_facet |
Broquard, Coralie Martinez, Anne-Sophie Maurouard, Elise Lamy, Jean-Baptiste Degremont, Lionel |
author_sort |
Broquard, Coralie |
title |
Sex determination in the oyster Crassostrea gigas - A large longitudinal study of population sex ratios and individual sex changes |
title_short |
Sex determination in the oyster Crassostrea gigas - A large longitudinal study of population sex ratios and individual sex changes |
title_full |
Sex determination in the oyster Crassostrea gigas - A large longitudinal study of population sex ratios and individual sex changes |
title_fullStr |
Sex determination in the oyster Crassostrea gigas - A large longitudinal study of population sex ratios and individual sex changes |
title_full_unstemmed |
Sex determination in the oyster Crassostrea gigas - A large longitudinal study of population sex ratios and individual sex changes |
title_sort |
sex determination in the oyster crassostrea gigas - a large longitudinal study of population sex ratios and individual sex changes |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.archives-ouvertes.fr/hal-02559678 https://hal.archives-ouvertes.fr/hal-02559678/document https://hal.archives-ouvertes.fr/hal-02559678/file/S004484861931926X.pdf https://doi.org/10.1016/j.aquaculture.2019.734555 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Crassostrea gigas Pacific oyster |
genre_facet |
Crassostrea gigas Pacific oyster |
op_source |
ISSN: 0044-8486 Aquaculture https://hal.archives-ouvertes.fr/hal-02559678 Aquaculture, Elsevier, 2020, 515, pp.734555. ⟨10.1016/j.aquaculture.2019.734555⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.aquaculture.2019.734555 hal-02559678 https://hal.archives-ouvertes.fr/hal-02559678 https://hal.archives-ouvertes.fr/hal-02559678/document https://hal.archives-ouvertes.fr/hal-02559678/file/S004484861931926X.pdf doi:10.1016/j.aquaculture.2019.734555 PII: S0044-8486(19)31926-X |
op_rights |
http://creativecommons.org/licenses/by-nc/ info:eu-repo/semantics/OpenAccess |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.1016/j.aquaculture.2019.734555 |
container_title |
Aquaculture |
container_volume |
515 |
container_start_page |
734555 |
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1766393646617198592 |