TY - JOUR T1 - Infestation of the cupped oysters Crassostrea angulata, C. gigas and their first-generation hybrids by the copepod Myicola ostreae: differences in susceptibility and host response A1 - Batista,F. M. A1 - Boudry,Pierre A1 - Dos Santos,A. A1 - Renault,Tristan A1 - Ruano,F. AD - INRB IPIMAR, P-8700305 Olhao, Portugal. AD - Univ Porto, Inst Ciencias Biomed Abel Salazar ICBAS, P-4099003 Oporto, Portugal. AD - IFREMER, UMR Physiol & Ecophysiol Mollusques Marins M100, F-29280 Plouzane, France. AD - INRB IPIMAR, P-1449006 Lisbon, Portugal. AD - IFREMER, Lab Genet Pathol, F-17390 La Tremblade, France. UR - https://archimer.ifremer.fr/doc/00000/6442/ DO - 10.1017/S0031182009005691 KW - Encapsulation KW - Host reaction KW - Host parasite relationship KW - Dominance inherence KW - Parasitism KW - Hybridization KW - Copepods KW - Oysters N2 - We Studied the prevalence and intensity of the parasitic copepod Myicola ostreae in 2 closely related oysters Crassostrea angulata and C. gigas and their F1 hybrids. The effects on host and host reaction were also analysed to better understand host-parasite relationships between copepods and bivalve molluscs. Full reciprocal crosses were carried out between C. angulata and C. gigas and the progenies were reared in the wild in Ria Formosa Lagoon (Portugal), allowing natural infestation by M. ostreae. Prevalence and intensity were significantly higher in C. angulata than in C. gigas. The parasite level of F1 hybrids was similar to C. angulata and significantly higher than in C. gigas. The results of our study support a hypothesis of dominantly inherited susceptibility to M. ostreae infestation. Moreover, copepods were observed on the gill surface of C. gigas engulfed by a capsule-like structure. Histological analyses revealed that the copepods were surrounded by a massive agglomerate of haemocyte-like cells encircled by a thin layer of fibroblast-like cells. This encapsulation response was not observed in C. angulata or in F1 hybrids. These results suggest that the differential susceptibility to M. ostreae between C. angulata and C. gigas may be ascribed to host defence factors. Y1 - 2009/04 PB - Cambridge University Press JF - Parasitology SN - 0031-1820 VL - 136 IS - 5 SP - 537 EP - 543 ID - 6442 ER -