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首页> 外文期刊>Parasitology >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.
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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.

机译：pe足类Myicola ostreae对杯状牡蛎Crassostrea angulata，C。gigas及其第一代杂种的侵袭：敏感性和寄主反应的差异。

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SUMMARY: 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.
机译：摘要：我们研究了寄生co足Myicola ostreae在2个密切相关的牡蛎Crassostrea angulata和C. gigas及其F1杂种中的流行和强度。还分析了对宿主和宿主反应的影响，以更好地了解co足类和双壳类软体动物之间的宿主-寄生虫关系。在C. angulata和C. gigas之间进行了完全的杂交，后代在Ria Formosa泻湖（葡萄牙）的野外饲养，从而使M. ostreae自然出没。 Angulata的患病率和强度明显高于C. gigas。 F1杂种的寄生虫水平与C. angulata相似，并且显着高于C. gigas。我们的研究结果支持一个假设，即对口粒支原体感染的遗传性很强。此外，在被荚膜状结构吞没的C. gigas的ill表面观察到co足类。组织学分析表明，co足类被大量成血细胞样细胞团聚体包围，而成团细胞样细胞则被成纤维细胞样细胞薄层包围。在Angulata或F1杂种中未观察到这种封装反应。这些结果表明，C。angulata和C. gigas之间对M. ostreae的敏感性差异可能归因于宿主防御因子。

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