Seppälä O, Karvonen A, Valtonen E T
Department of Biological and Environmental Science, University of Jyväskylä, Finland.
J Parasitol. 2007 Oct;93(5):1244-6. doi: 10.1645/GE-1187R.1.
The present study examined phenotypic variation in infectivity of Diplostomum spathaceum (Trematoda) cercariae within a natural population. Twelve infected Lymnaea stagnalis were collected from the field, and the infectivity of cercariae from individual snails was assessed under constant laboratory conditions. At a water temperature of 16.3 C, the mean infectivity of cercariae from the snails varied between 55.5% and 87.5%. Depending on the source of variation, this may have important ecological and evolutionary implications for both natural parasite populations and those occurring in aquaculture.
本研究调查了自然种群中剑带双腔吸虫（吸虫纲）尾蚴感染力的表型变异。从野外采集了12只感染的椎实螺，并在恒定的实验室条件下评估了单个螺体内尾蚴的感染力。在水温16.3摄氏度时，螺体内尾蚴的平均感染力在55.5%至87.5%之间变化。根据变异来源，这可能对自然寄生虫种群以及水产养殖中的寄生虫种群具有重要的生态和进化意义。
