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Infection dynamics of Marteilia refringens in flat oyster Ostrea edulis and copepod Paracartia grani in a claire pond of Marennes-Oléron Bay

Identifieur interne : 004E91 ( Main/Exploration ); précédent : 004E90; suivant : 004E92

Infection dynamics of Marteilia refringens in flat oyster Ostrea edulis and copepod Paracartia grani in a claire pond of Marennes-Oléron Bay

Auteurs : Corinne Audemard [France] ; Marie-Céline Sajus [France] ; Antoine Barnaud [France] ; Benoit Sautour [France] ; Pierre-Guy Sauriau [France] ; Frank J. C. Berthe [France]

Source :

RBID : Hal:hal-01854919

English descriptors

Abstract

The protozoan parasite Marteilia refringens has been partly responsible for the severe decrease in the production of the European flat oyster Ostrea edulis Linnaeus in France since the 1970s. The calanoid copepod Paracartia grani Sars was recently found to be a host for M. refringens in French shallow-water oyster ponds (Œclaires¹). This study reconsidered M. refringens transmission dynamics in the light of this finding, taking into account not only oyster infection dynamics and environmental factors but also data concerning the copepod host. P. grani population dynamics in the claire under study revealed that this species is the dominant planktonic copepod in this confined ecosystem. During winter, M. refringens overwintered in O. edulis, with P. grani existing only as resting eggs in the sediment. The increase in temperature in spring controlled and synchronized both the release of M. refringens sporangia in the oyster feces, and the hatching of the benthic resting eggs of the copepod. Infection of oysters by M. refringens was limited to June, July and August, coinciding with (1) the highest temperature recorded in the claire, and (2) the highest abundance of P. grani. PCR detection of M. refringens in P. grani during the summer period was linked to the release of parasite sporangia by the oyster. Our results are supported by previous results on the effective transmission of this parasite from the oyster to the copepod.


Url:
DOI: 10.3354/dao061103


Affiliations:

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<name sortKey="Sauriau, Pierre Guy" sort="Sauriau, Pierre Guy" uniqKey="Sauriau P" first="Pierre-Guy" last="Sauriau">Pierre-Guy Sauriau</name>
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<author>
<name sortKey="Berthe, Frank J C" sort="Berthe, Frank J C" uniqKey="Berthe F" first="Frank J. C." last="Berthe">Frank J. C. Berthe</name>
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<orgName>Institut Français de Recherche pour l'Exploitation de la Mer</orgName>
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<date type="start">1984</date>
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<addrLine>155, rue Jean-Jacques Rousseau - 92 138 Issy-les-Moulineaux Cedex</addrLine>
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<idno type="DOI">10.3354/dao061103</idno>
<series>
<title level="j">Diseases of Aquatic Organisms</title>
<idno type="ISSN">0177-5103</idno>
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<date type="datePub">2004-10-21</date>
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<keywords scheme="mix" xml:lang="en">
<term> Claire pond </term>
<term> Infection dynamics</term>
<term> Ostrea edulis</term>
<term> Paracartia grani</term>
<term>Marteilia refringens</term>
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<div type="abstract" xml:lang="en">
<p>The protozoan parasite Marteilia refringens has been partly responsible for the severe decrease in the production of the European flat oyster Ostrea edulis Linnaeus in France since the 1970s. The calanoid copepod Paracartia grani Sars was recently found to be a host for M. refringens in French shallow-water oyster ponds (Œclaires¹). This study reconsidered M. refringens transmission dynamics in the light of this finding, taking into account not only oyster infection dynamics and environmental factors but also data concerning the copepod host. P. grani population dynamics in the claire under study revealed that this species is the dominant planktonic copepod in this confined ecosystem. During winter, M. refringens overwintered in O. edulis, with P. grani existing only as resting eggs in the sediment. The increase in temperature in spring controlled and synchronized both the release of M. refringens sporangia in the oyster feces, and the hatching of the benthic resting eggs of the copepod. Infection of oysters by M. refringens was limited to June, July and August, coinciding with (1) the highest temperature recorded in the claire, and (2) the highest abundance of P. grani. PCR detection of M. refringens in P. grani during the summer period was linked to the release of parasite sporangia by the oyster. Our results are supported by previous results on the effective transmission of this parasite from the oyster to the copepod. </p>
</div>
</front>
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<li>France</li>
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</noRegion>
<name sortKey="Barnaud, Antoine" sort="Barnaud, Antoine" uniqKey="Barnaud A" first="Antoine" last="Barnaud">Antoine Barnaud</name>
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