Barger M A, Janovy J
School of Biological Sciences, University of Nebraska-Lincoln 68588-0118.
J Parasitol. 1994 Dec;80(6):1032-5.
Intermediate and definitive host specificity of Rhabdochona canadensis in Nebraska were investigated. Mayfly nymphs Trichorythodes sp. and Caenis sp. were found to serve as experimental intermediate hosts. Development inside the nymphs required approximately 10 days, with the worms passing through 2 molts and then becoming encapsulated in the hemocoel as infective third-stage juveniles. Survey data revealed that only the red shiner Cyprinella lutrensis serves as definitive host for R. canadensis in nature. Laboratory infections of Notropis dorsalis, N. stramineus, and Fundulus zebrinus, all of which were uninfected in nature, were attempted to determine if observed specificity was due to physiological or ecological factors. Two individuals of N. dorsalis became infected with R. canadensis, but no development was observed. Both N. stramineus and F. zebrinus were incapable of becoming infected. Thus, definitive host specificity in this system seems to be mediated by both physiological and host ecological factors.
对加拿大横纹线虫在 Nebraska 的中间宿主和终末宿主特异性进行了研究。发现蜉蝣若虫 Trichorythodes sp. 和 Caenis sp. 可作为实验性中间宿主。在若虫体内发育大约需要 10 天，蠕虫经过 2 次蜕皮，然后在血腔中形成包囊，成为感染性第三期幼虫。调查数据显示，在自然界中只有红睛鲤 Cyprinella lutrensis 作为加拿大横纹线虫的终末宿主。尝试对自然条件下未感染的背点无须魮 Notropis dorsalis、细纹无须魮 N. stramineus 和斑马底鳉 Fundulus zebrinus 进行实验室感染，以确定观察到的特异性是由生理因素还是生态因素引起的。2 只背点无须魮感染了加拿大横纹线虫，但未观察到发育情况。细纹无须魮和斑马底鳉均无法被感染。因此，该系统中的终末宿主特异性似乎是由生理因素和宿主生态因素共同介导的。
