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首页> 外文期刊>Polar biology >Observation by electron microscopy of a gregarine parasite of Antarctic krill: its histological aspects and ecological explanations
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Observation by electron microscopy of a gregarine parasite of Antarctic krill: its histological aspects and ecological explanations

机译：电子显微镜观察南极磷虾的一种人造黄油寄生虫：其组织学方面和生态学解释

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摘要

Antarctic krill are parasitized by gregarines (Phylum Apicomplexa, Class Sporozoea, Order Eugrega-rinida), which were observed in this study by light, scanning, and transmission electron microscopy. Eighty seven percentage of the krill examined (n = 93) were infected with the parasites in the cephalin stage, which were regularly found in the hind-gut epithelium of their host. Cepha-lins were found attached to the epithelium, and then were liberated into the intestinal lumen. The gamont stage, which follows the cephalin stage, was found in the intestinal lumen, as well as the diverticulum of mid-gut gland. However, gamonts found in the mid-gut gland were considerably larger and elongated in comparison with those in the intestinal lumen. Gamonts in the diverticulum appear to damage microvilli, which are involved in the uptake of digested nutrients and secretion of various enzymes. Therefore, elevated infestation of this parasite in the mid-gut gland may have a significant impact on the nutritional state of the Antarctic krill host.
机译：南极磷虾被菜豆（Phylum Apicomplexa，Sporozoea类，Eugrega-rinida菜）寄生，在本研究中通过光镜，扫描镜和透射电子显微镜观察到。所检查的磷虾中有百分之八十七（n = 93）在头颅期已被寄生虫感染，这些寄生虫通常在宿主的后肠上皮中发现。发现头孢菌素附着在上皮上，然后释放到肠腔中。在肠腔以及中肠腺的憩室中发现了继脑素阶段之后的gamont阶段。然而，与肠腔相比，在中肠腺中发现的gamonts更大且拉长。憩室中的Gamonts似乎会损害微绒毛，微绒毛与消化的营养物质的摄取和各种酶的分泌有关。因此，肠道中部这种寄生虫的侵染可能对南极磷虾宿主的营养状况产生重大影响。

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