Department of Invertebrate Zoology, Institute of General and Molecular Biology, Nicolaus Copernicus University, Toruń, Poland.
J Invertebr Pathol. 2012 Mar;109(3):269-73. doi: 10.1016/j.jip.2011.12.006. Epub 2012 Jan 8.
The subject of the research was the thermal preferences of Planorbarius corneus individuals infected by larvae of digenetic trematodes. Snails were obtained over two consecutive years, 2009 and 2010, from 10 water bodies located in central Poland. The relationship between the seasons and the occurrence of patent invasions in hosts found in the shore-zone of lakes was observed. Behavioural experiments conducted on P. corneus individuals placed in a thermal gradient demonstrated that parasite infection had an impact on the thermal preferences of the snails. Individuals that shed cercariae of Bilharziella polonica, Cotylurus sp., Notocotylus ephemera, Rubenstrema exasperatum/Neoglyphe locellus, Rubenstrema opisthovitellinum, or Tylodelphys excavata displayed symptoms of behavioural anapyrexia, similarly to experimentally injured snails. This response increased the survival of infected individuals while simultaneously prolonging the period of shedding of dispersive forms of parasites. This point of view was upheld by the observation that infected snails bred at 19°C lived longer than at 26°C and the shedding rate of cercariae at a lower temperature was lower than at a higher one.
研究对象为感染双壳目吸虫幼虫的扁卷螺个体的热偏好。2009 年和 2010 年，连续两年从波兰中部的 10 个水体中获得了蜗牛。观察了宿主在湖滨地区出现专利入侵与季节之间的关系。在置于热梯度中的扁卷螺个体上进行的行为实验表明，寄生虫感染对蜗牛的热偏好有影响。排出波兰双壳吸虫、Cotylurus 属、Notocotylus ephemera、Rubenstrema exasperatum/Neoglyphe locellus、Rubenstrema opisthovitellinum 或 Tylodelphys excavata 尾蚴的个体表现出行为性发热症状，与实验性受伤的蜗牛相似。这种反应增加了感染个体的存活率，同时延长了寄生虫的扩散形式的脱落期。这一观点得到了以下观察结果的支持：在 19°C 下繁殖的感染蜗牛比在 26°C 下繁殖的蜗牛寿命更长，并且在较低温度下尾蚴的脱落率低于较高温度下的脱落率。
