Data from Taskinen et al. (2022, Parasitology). Contrasting temperature responses in seasonal timing of cercariae shedding by Rhipidocotyle trematodes.

Three files with data and one metadata file with the description of variables. These data were used to prepare the paper 'Contrasting temperature responses in seasonal timing of cercariae shedding by Rhipidocotyle trematodes' autored by Jouni Taskinen, Jocelyn M. Choo, Ekaterina Mironova and Mikhail Gopko. The paper was accepted to Parasitology in 2022.
Abstract
Global warming is likely to lengthen the seasonal duration of larval release by parasites. We exposed freshwater mussel hosts, Anodonta anatina, from two high-latitude populations to high, intermediate, and low temperatures throughout the annual cercarial shedding period of the sympatric trematodes Rhipidocotyle fennica and R. campanula, sharing the same transmission pathway. At the individual host level, under warmer conditions, the timing of the cercarial release in both parasite species shifted towards seasonally earlier period while its duration did not change. At the host population level, evidence for the lengthening of larvae shedding period with warming was found for R. fennica. R. campanula started the cercarial release seasonally clearly earlier, and at a lower temperature, than R. fennica. Furthermore, the proportion of mussels shedding cercariae increased, while day-degrees required to start the cercariae shedding decreased in high-temperature treatment in R. fennica. In R. campanula these effects were not found, suggesting that warming can benefit more R. fennica. These results do not completely support the view that climate warming would invariably increase the seasonal duration of larval shedding by parasites, but emphasizes species-specific differences in temperature-dependence and in seasonality of cercarial release.

本数据集包含三份数据文件与一份元数据文件，该元数据文件用于说明变量的相关信息。相关数据曾用于撰写论文《Contrasting temperature responses in seasonal timing of cercariae shedding by Rhipidocotyle trematodes》，作者为Jouni Taskinen、Jocelyn M. Choo、Ekaterina Mironova与Mikhail Gopko，该论文于2022年被《寄生虫学（Parasitology）》期刊收录。

**摘要** 全球变暖或可延长寄生虫幼虫释放的季节持续时长。本研究将来自两个高纬度种群的淡水蚌宿主（Anodonta anatina），在同域寄生的扇盘吸虫Rhipidocotyle fennica与Rhipidocotyle campanula（二者共享相同的传播途径）的年度尾蚴（cercariae）释放期内，分别置于高温、中温与低温环境下开展暴露实验。在宿主个体层面，当环境温度升高时，两种寄生虫的尾蚴释放时间均向季节早期偏移，但释放持续时长未发生变化。在宿主种群层面，研究发现升温可延长Rhipidocotyle fennica的幼虫释放期。Rhipidocotyle campanula的尾蚴释放季相较于Rhipidocotyle fennica明显更早启动，且所需启动温度更低。此外，在高温处理组中，Rhipidocotyle fennica的尾蚴释放蚌比例有所上升，而启动尾蚴释放所需的日度（day-degrees）累积值有所降低；上述效应在Rhipidocotyle campanula中并未观测到，这表明升温或许更有利于Rhipidocotyle fennica。本研究结果并未完全支持“气候变暖必然会延长寄生虫幼虫释放的季节持续时长”这一观点，而是强调了不同寄生虫物种在温度依赖性与尾蚴释放季节性方面存在物种特异性差异。