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Processes leading to the coexistence of a host and its parasitoid in homogeneous environments: The role of an infected dormant stage ArchiMer
Arancio, Marc; Sourisseau, Marc; Souissi, Sami.
Theoretical studies have usually been used to explain host–parasitoid persistence in conditions of spatial heterogeneity or in homogeneous environments with specific conditions. In shallow estuaries where spatial heterogeneity is prevented by tides and river input, a common host–parasitoid system (dinoflagellate-Amoebophrya spp.) is able to persist even in the absence of specific conditions described in the literature. Recent observations have revealed that the cyst stage (during which the dinoflagellate host can survive in difficult environmental conditions in a dormant stage) can be infected by the parasitoid. The encystment/excystment process is suspected to be the basis for the long-term persistence of the system. In this work, the coexistence of...
Tipo: Text Palavras-chave: Individual-based model; Dinoflagellate; Parasitoid; Amoebophrya; Host-parasite interactions; Sources of coexistence.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00180/29119/27692.pdf
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Flat oyster follows the apoptosis pathway to defend against the protozoan parasite Bonamia ostreae ArchiMer
Gervais, Ophelie; Chollet, Bruno; Renault, Tristan; Arzul, Isabelle.
The in vitro model Ostrea edulis hemocyte - Bonamia ostreae is interesting to investigate host-parasite interactions at the cellular level. Indeed, this unicellular parasite infects the flat oyster Ostrea edulis and multiplies within hemocytes, the central effectors of oyster defenses. Apoptosis is a mechanism used by many organisms to eliminate infected cells. In order to study the potential involvement of this mechanism in the oyster response to B. ostreae, in vitro experiments were carried out by exposing hemocytes from the naturally susceptible oyster O. edulis and a resistant oyster species Crassostrea gigas to live and heat-inactivated parasites. Hemocyte apoptotic response was measured using a combination of flow cytometry and microscopy analyses....
Tipo: Text Palavras-chave: Apoptosis; Host-parasite interactions; Parasite; Oyster; Bonamia ostreae; Ostrea edulis.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00346/45692/45312.pdf
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