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Download front mission 1 22/2/2024 ![]() refringens was more detected in summer and fall than in winter and spring, contrary to B. Finally, the analysis of environmental data allowed describing the seasonal dynamics of both parasites in Rade of Brest: M. ostreae prevalence in flat oysters was low and the parasite was almost never detected in planktonic and benthic compartments. It was also detected in all the sampled environmental compartments, suggesting their involvement in parasite transmission and overwintering. refringens was detected in flat oysters over the whole sampling period, sometimes with a prevalence exceeding 90%. ![]() ![]() In addition, we used previously developed eDNA based-approaches to detect parasites in planktonic and benthic compartments for the last two years of the survey. We used real-time PCR to monitor seasonally over four years the presence of both parasites in flat oysters. ostreae in Rade of Brest, where both parasites are known to be present. Methods: We carried out an integrated field study to investigate the dynamics of M. Despite almost 40 years of research, the life-cycle of these parasites is still poorly known, especially regarding their environmental distribution. Introduction: Marteilia refringens and Bonamia ostreae are protozoan parasites responsible for mortalities of farmed and wild flat oysters Ostrea edulis in Europe since 19, respectively. 3Laboratoire des Sciences de l’Environnement Marin (LEMAR), Unité Mixte de Recherche (UMR) 6539 Ifremer/Université de Bretagne Occidentale (UBO)/Institut de Recherche pour le Développement (IRD)/Centre National de la Recherche Scientifique (CNRS), Ifremer, Argenton-en-Landunvez, France.2POS3IDON, R&D Department, Saint Malo, France. ![]()
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