Alexandrium catenella increases the susceptibility of Crassostrea gigas to pathogenic vibrios: possible implications in oyster mass mortalities in the Mediterranean Thau lagoon
Since several years an alarming worldwide expansion of Harmful Algae Bloom (HAB) was observed in coastal and / or confined waters. Alexandrium catenella, a paralytic shellfish poisoning (PSP) producer, is now regularly found in Thau lagoon (south of France) at concentrations up to 15x106 cellules. l...
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fttriple:oai:gotriple.eu:10670/1.drqcte 2023-05-15T15:59:00+02:00 Alexandrium catenella increases the susceptibility of Crassostrea gigas to pathogenic vibrios: possible implications in oyster mass mortalities in the Mediterranean Thau lagoon Abi-Khalil, Célina Lopez-Joven, Carmen Abadie, E. Savar, V. Amzil, Z. Laabir, M. Rolland, Jean-Luc Interactions Hôtes-Pathogènes-Environnements (IHPE) Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Perpignan Via Domitia (UPVD) MARine Biodiversity Exploitation and Conservation (UMR MARBEC) Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut de Recherche pour le Développement (IRD) Laboratoire Phycotoxines Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) CNRS, IFREMER, ANSES, IUEM Brest, France 2015-03-31 https://hal-sde.archives-ouvertes.fr/hal-01259581 en eng HAL CCSD hal-01259581 10670/1.drqcte https://hal-sde.archives-ouvertes.fr/hal-01259581 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société Conférence Nationale Phycotox et GIS Cyano. Diversité, écologie et fonctionnement des microalgues toxiques et cyanobactéries: de leurs toxines et interactions avec les autres organismes aux risques écosystémiques et socio-économiques associés Conférence Nationale Phycotox et GIS Cyano. Diversité, écologie et fonctionnement des microalgues toxiques et cyanobactéries: de leurs toxines et interactions avec les autres organismes aux risques écosystémiques et socio-économiques associés, CNRS, IFREMER, ANSES, IUEM, Mar 2015, Brest, France envir demo Conference Output https://vocabularies.coar-repositories.org/resource_types/c_c94f/ 2015 fttriple 2023-01-22T17:45:35Z Since several years an alarming worldwide expansion of Harmful Algae Bloom (HAB) was observed in coastal and / or confined waters. Alexandrium catenella, a paralytic shellfish poisoning (PSP) producer, is now regularly found in Thau lagoon (south of France) at concentrations up to 15x106 cellules. l-1. In the same periods, events of oyster’s mortality are also observed causing huge economic losses. The purpose of this study is to investigate the relationship between these toxic events and mortality phenomenon. For that, we conducted a field work to evaluate the presence of the toxic A. catenella in Thau lagoon during the years 2013 and 2014 in which high mortality of oysters spats were observed in spring. At the same time, we experimentally infected spats with the pathogenic bacterium V. tasmaniensis LGP32 and kept them unfed or previously fed either with the toxic alga A. catenella or with nontoxic algae, Alexandrium tamarense or Tisochrysis lutea. Results showed that the toxic alga was present in the lagoon when spats' mortalities occurred suggesting A. catenella could be involved in these events. Moreover, our laboratory experiment showed that the exposure to A. catenella increases the susceptibility of spats to one of its pathogens, V. tasmaniensis LGP32. Those results both together suggest for the first time that, in the environment, toxic algae could be implicated in oysters’ mortality. Further studies should be conducted to determine the main factors of this alga implicated in weakening oysters and their immune system against their pathogen which lead to these large scale mortalities National audience Other/Unknown Material Crassostrea gigas Unknown |
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envir demo Abi-Khalil, Célina Lopez-Joven, Carmen Abadie, E. Savar, V. Amzil, Z. Laabir, M. Rolland, Jean-Luc Alexandrium catenella increases the susceptibility of Crassostrea gigas to pathogenic vibrios: possible implications in oyster mass mortalities in the Mediterranean Thau lagoon |
topic_facet |
envir demo |
description |
Since several years an alarming worldwide expansion of Harmful Algae Bloom (HAB) was observed in coastal and / or confined waters. Alexandrium catenella, a paralytic shellfish poisoning (PSP) producer, is now regularly found in Thau lagoon (south of France) at concentrations up to 15x106 cellules. l-1. In the same periods, events of oyster’s mortality are also observed causing huge economic losses. The purpose of this study is to investigate the relationship between these toxic events and mortality phenomenon. For that, we conducted a field work to evaluate the presence of the toxic A. catenella in Thau lagoon during the years 2013 and 2014 in which high mortality of oysters spats were observed in spring. At the same time, we experimentally infected spats with the pathogenic bacterium V. tasmaniensis LGP32 and kept them unfed or previously fed either with the toxic alga A. catenella or with nontoxic algae, Alexandrium tamarense or Tisochrysis lutea. Results showed that the toxic alga was present in the lagoon when spats' mortalities occurred suggesting A. catenella could be involved in these events. Moreover, our laboratory experiment showed that the exposure to A. catenella increases the susceptibility of spats to one of its pathogens, V. tasmaniensis LGP32. Those results both together suggest for the first time that, in the environment, toxic algae could be implicated in oysters’ mortality. Further studies should be conducted to determine the main factors of this alga implicated in weakening oysters and their immune system against their pathogen which lead to these large scale mortalities National audience |
author2 |
Interactions Hôtes-Pathogènes-Environnements (IHPE) Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Perpignan Via Domitia (UPVD) MARine Biodiversity Exploitation and Conservation (UMR MARBEC) Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut de Recherche pour le Développement (IRD) Laboratoire Phycotoxines Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) CNRS, IFREMER, ANSES, IUEM |
format |
Other/Unknown Material |
author |
Abi-Khalil, Célina Lopez-Joven, Carmen Abadie, E. Savar, V. Amzil, Z. Laabir, M. Rolland, Jean-Luc |
author_facet |
Abi-Khalil, Célina Lopez-Joven, Carmen Abadie, E. Savar, V. Amzil, Z. Laabir, M. Rolland, Jean-Luc |
author_sort |
Abi-Khalil, Célina |
title |
Alexandrium catenella increases the susceptibility of Crassostrea gigas to pathogenic vibrios: possible implications in oyster mass mortalities in the Mediterranean Thau lagoon |
title_short |
Alexandrium catenella increases the susceptibility of Crassostrea gigas to pathogenic vibrios: possible implications in oyster mass mortalities in the Mediterranean Thau lagoon |
title_full |
Alexandrium catenella increases the susceptibility of Crassostrea gigas to pathogenic vibrios: possible implications in oyster mass mortalities in the Mediterranean Thau lagoon |
title_fullStr |
Alexandrium catenella increases the susceptibility of Crassostrea gigas to pathogenic vibrios: possible implications in oyster mass mortalities in the Mediterranean Thau lagoon |
title_full_unstemmed |
Alexandrium catenella increases the susceptibility of Crassostrea gigas to pathogenic vibrios: possible implications in oyster mass mortalities in the Mediterranean Thau lagoon |
title_sort |
alexandrium catenella increases the susceptibility of crassostrea gigas to pathogenic vibrios: possible implications in oyster mass mortalities in the mediterranean thau lagoon |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal-sde.archives-ouvertes.fr/hal-01259581 |
op_coverage |
Brest, France |
genre |
Crassostrea gigas |
genre_facet |
Crassostrea gigas |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société Conférence Nationale Phycotox et GIS Cyano. Diversité, écologie et fonctionnement des microalgues toxiques et cyanobactéries: de leurs toxines et interactions avec les autres organismes aux risques écosystémiques et socio-économiques associés Conférence Nationale Phycotox et GIS Cyano. Diversité, écologie et fonctionnement des microalgues toxiques et cyanobactéries: de leurs toxines et interactions avec les autres organismes aux risques écosystémiques et socio-économiques associés, CNRS, IFREMER, ANSES, IUEM, Mar 2015, Brest, France |
op_relation |
hal-01259581 10670/1.drqcte https://hal-sde.archives-ouvertes.fr/hal-01259581 |
op_rights |
undefined |
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1766394781180624896 |