Effects of the toxic dinoflagellate Alexandrium minutum on the reproduction and development of the oyster Crassostrea gigas
Recent decades have witnessed the intensification and spread of harmful algal blooms (HAB). HAB are known to disrupt coastal ecosystems and to be toxic for marine organisms. These phenomena are also suspected to be responsible for recruitment failures of bivalves. The aim of this PhD was to study th...
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Other Authors: | , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
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HAL CCSD
2018
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Online Access: | https://theses.hal.science/tel-03035012 https://theses.hal.science/tel-03035012/document https://theses.hal.science/tel-03035012/file/These-2018-SML-Biologie_marine-CASTREC_Justine.pdf |
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ftunivbrest:oai:HAL:tel-03035012v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
French |
topic |
Harmful algal bloom Paralytic shellfish toxins Bioactive extracellular compounds Reproduction Bivalves Larvae Efflorescences toxiques Toxines paralysantes Composés extracellulaires bioactifs Huître Larves [SDV.BA]Life Sciences [q-bio]/Animal biology |
spellingShingle |
Harmful algal bloom Paralytic shellfish toxins Bioactive extracellular compounds Reproduction Bivalves Larvae Efflorescences toxiques Toxines paralysantes Composés extracellulaires bioactifs Huître Larves [SDV.BA]Life Sciences [q-bio]/Animal biology Castrec, Justine Effects of the toxic dinoflagellate Alexandrium minutum on the reproduction and development of the oyster Crassostrea gigas |
topic_facet |
Harmful algal bloom Paralytic shellfish toxins Bioactive extracellular compounds Reproduction Bivalves Larvae Efflorescences toxiques Toxines paralysantes Composés extracellulaires bioactifs Huître Larves [SDV.BA]Life Sciences [q-bio]/Animal biology |
description |
Recent decades have witnessed the intensification and spread of harmful algal blooms (HAB). HAB are known to disrupt coastal ecosystems and to be toxic for marine organisms. These phenomena are also suspected to be responsible for recruitment failures of bivalves. The aim of this PhD was to study the consequences of blooms of toxic dinoflagellate Alexandrium minutum on the reproduction, development and recruitment of the oyster Crassostrea gigas, a species of major economic importance. A. minutum is known to produce paralytic shellfish toxins (PST) and bioactive extracellular compounds (BEC). Gametes and early life stages were the most sensitive, particularly to the bioactive extracellular compounds (BEC) produced by A. minutum, which inhibited fertilization and embryogenesis. A. minutum modified the behaviour of veliger larvae, decreased their filtration, growth and settlement. Exposure of adult oysters during gametogenesis affected the development of offspring, reflecting alterations in gamete content and/or vertical transfer of PST. Mode of action of PST and BEC are to further investigate. These oyster exposures, conducted at environmentally relevant concentrations of microalgae, suggest that recurrent blooms of A. minutum during oyster spawning and larval development could have long-term consequences on the structure of wild and cultured populations of C. gigas. Les dernières décennies ont été marquées par l’intensification et l’expansion des efflorescences de micro-algues toxiques (HAB). Connues pour perturber les écosystèmes côtiers et pour leur toxicité sur les organismes marins, les HAB sont suspectées d’être à l’origine de défauts de recrutement de bivalves. Cette thèse avait pour objectif d’étudier les conséquences des efflorescences du dinoflagellé toxique Alexandrium minutum, producteur de toxines paralysantes (PST) et des composés bioactifs extracellulaires (BEC), sur la reproduction, le développement et le recrutement de l’huître Crassostrea gigas, une espèce à l’importance économique majeure. ... |
author2 |
Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université de Bretagne occidentale - Brest Philippe Soudant |
format |
Doctoral or Postdoctoral Thesis |
author |
Castrec, Justine |
author_facet |
Castrec, Justine |
author_sort |
Castrec, Justine |
title |
Effects of the toxic dinoflagellate Alexandrium minutum on the reproduction and development of the oyster Crassostrea gigas |
title_short |
Effects of the toxic dinoflagellate Alexandrium minutum on the reproduction and development of the oyster Crassostrea gigas |
title_full |
Effects of the toxic dinoflagellate Alexandrium minutum on the reproduction and development of the oyster Crassostrea gigas |
title_fullStr |
Effects of the toxic dinoflagellate Alexandrium minutum on the reproduction and development of the oyster Crassostrea gigas |
title_full_unstemmed |
Effects of the toxic dinoflagellate Alexandrium minutum on the reproduction and development of the oyster Crassostrea gigas |
title_sort |
effects of the toxic dinoflagellate alexandrium minutum on the reproduction and development of the oyster crassostrea gigas |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://theses.hal.science/tel-03035012 https://theses.hal.science/tel-03035012/document https://theses.hal.science/tel-03035012/file/These-2018-SML-Biologie_marine-CASTREC_Justine.pdf |
genre |
Crassostrea gigas |
genre_facet |
Crassostrea gigas |
op_source |
https://theses.hal.science/tel-03035012 Biologie animale. Université de Bretagne occidentale - Brest, 2018. Français. ⟨NNT : 2018BRES0080⟩ |
op_relation |
NNT: 2018BRES0080 tel-03035012 https://theses.hal.science/tel-03035012 https://theses.hal.science/tel-03035012/document https://theses.hal.science/tel-03035012/file/These-2018-SML-Biologie_marine-CASTREC_Justine.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1790599190617784320 |
spelling |
ftunivbrest:oai:HAL:tel-03035012v1 2024-02-11T10:03:03+01:00 Effects of the toxic dinoflagellate Alexandrium minutum on the reproduction and development of the oyster Crassostrea gigas Impacts des efflorescences du dinoflagellé toxique Alexandrium minutum sur la reproduction et le développement de l'huître Crassostrea gigas Castrec, Justine Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université de Bretagne occidentale - Brest Philippe Soudant 2018-11-28 https://theses.hal.science/tel-03035012 https://theses.hal.science/tel-03035012/document https://theses.hal.science/tel-03035012/file/These-2018-SML-Biologie_marine-CASTREC_Justine.pdf fr fre HAL CCSD NNT: 2018BRES0080 tel-03035012 https://theses.hal.science/tel-03035012 https://theses.hal.science/tel-03035012/document https://theses.hal.science/tel-03035012/file/These-2018-SML-Biologie_marine-CASTREC_Justine.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-03035012 Biologie animale. Université de Bretagne occidentale - Brest, 2018. Français. ⟨NNT : 2018BRES0080⟩ Harmful algal bloom Paralytic shellfish toxins Bioactive extracellular compounds Reproduction Bivalves Larvae Efflorescences toxiques Toxines paralysantes Composés extracellulaires bioactifs Huître Larves [SDV.BA]Life Sciences [q-bio]/Animal biology info:eu-repo/semantics/doctoralThesis Theses 2018 ftunivbrest 2024-01-23T23:39:29Z Recent decades have witnessed the intensification and spread of harmful algal blooms (HAB). HAB are known to disrupt coastal ecosystems and to be toxic for marine organisms. These phenomena are also suspected to be responsible for recruitment failures of bivalves. The aim of this PhD was to study the consequences of blooms of toxic dinoflagellate Alexandrium minutum on the reproduction, development and recruitment of the oyster Crassostrea gigas, a species of major economic importance. A. minutum is known to produce paralytic shellfish toxins (PST) and bioactive extracellular compounds (BEC). Gametes and early life stages were the most sensitive, particularly to the bioactive extracellular compounds (BEC) produced by A. minutum, which inhibited fertilization and embryogenesis. A. minutum modified the behaviour of veliger larvae, decreased their filtration, growth and settlement. Exposure of adult oysters during gametogenesis affected the development of offspring, reflecting alterations in gamete content and/or vertical transfer of PST. Mode of action of PST and BEC are to further investigate. These oyster exposures, conducted at environmentally relevant concentrations of microalgae, suggest that recurrent blooms of A. minutum during oyster spawning and larval development could have long-term consequences on the structure of wild and cultured populations of C. gigas. Les dernières décennies ont été marquées par l’intensification et l’expansion des efflorescences de micro-algues toxiques (HAB). Connues pour perturber les écosystèmes côtiers et pour leur toxicité sur les organismes marins, les HAB sont suspectées d’être à l’origine de défauts de recrutement de bivalves. Cette thèse avait pour objectif d’étudier les conséquences des efflorescences du dinoflagellé toxique Alexandrium minutum, producteur de toxines paralysantes (PST) et des composés bioactifs extracellulaires (BEC), sur la reproduction, le développement et le recrutement de l’huître Crassostrea gigas, une espèce à l’importance économique majeure. ... Doctoral or Postdoctoral Thesis Crassostrea gigas Université de Bretagne Occidentale: HAL |