中间宿主分类群与似袋线虫属线虫感染之间的关系。

Relationship between intermediate host taxon and infection by nematodes of the genus Rhabdochona.

作者信息

Hirasawa Riyo, Urabe Misako, Yuma Masahide

机构信息

Center for Ecological Research, Kyoto University, Otsu, Shiga, Japan.

出版信息

Parasitol Int. 2004 Mar;53(1):89-97. doi: 10.1016/j.parint.2003.12.001.

DOI:10.1016/j.parint.2003.12.001

PMID:14984839

Abstract

We describe the intermediate and definitive hosts of the fish nematodes Rhabdochona coronacauda and R. denudata honshuensis and discuss the relationships between parasitism and the feeding habitats of their intermediate hosts. We found that the principal intermediate hosts of the two nematodes were filter-feeding mayflies of the genera Ephemera, Photamanthus and Isonychia. Ephemera strigata seemed to be the most important intermediate host of these nematodes. Adult R. coronacauda were found mainly in Hemibarbus longirostris and Rhinogobius flumineus, which are benthic fishes that feed on benthic aquatic insects, including E. strigata. For R. coronacauda, therefore, the feeding habits of the definitive hosts facilitate host alternation by this species. However, adult R. denudata honshuensis were found in cyprinids. In particular, Zacco temmincki was the principal natural definitive host in our study area. Since Z. temmincki is a swimming predator, E. strigata nymphs that burrow in the substrate are not the main prey of this species. This indicates that the transmission of R. denudata honshuensis hardly occurs from E. strigata nymph to Z. temmincki, suggesting another, unknown transmission route.

摘要

我们描述了鱼类线虫冠状吻腔线虫（Rhabdochona coronacauda）和本州裸尾线虫（R. denudata honshuensis）的中间宿主和终末宿主，并讨论了寄生现象与其中间宿主摄食生境之间的关系。我们发现，这两种线虫的主要中间宿主是蜉蝣科（Ephemera）、光裳蜉属（Photamanthus）和等蜉属（Isonychia）的滤食性蜉蝣。条纹蜉（Ephemera strigata）似乎是这些线虫最重要的中间宿主。成年冠状吻腔线虫主要发现于长吻似鲮（Hemibarbus longirostris）和河川吻虾虎鱼（Rhinogobius flumineus）体内，这两种都是底栖鱼类，以包括条纹蜉在内的底栖水生昆虫为食。因此，对于冠状吻腔线虫来说，终末宿主的摄食习性促进了该物种的宿主转换。然而，成年本州裸尾线虫见于鲤科鱼类。特别是，在我们的研究区域，宽鳍鱲（Zacco temmincki）是主要的天然终末宿主。由于宽鳍鱲是游动性捕食者，钻入水底的条纹蜉若虫并非该物种的主要猎物。这表明本州裸尾线虫很难从条纹蜉若虫传播至宽鳍鱲，提示存在另一条未知的传播途径。