Data from: Predation risk affects growth and reproduction of an invasive snail and its lethal effect depends on prey size

The behavior of invasive species under predation risk has been studied extensively, but their growth and reproductive responses have rarely been investigated. We conducted experiments with juveniles and adults of the invasive freshwater snail Pomacea canaliculata, and we observed changes in growth and reproduction in response to predation risk from a caged predator (Trachemys scripta elegans). P. canaliculata produced eggs earlier in the presence of predators and injured conspecifics compared with the control group (no risk), although the total number of egg masses laid by per female was exceeded by that of the controls after 15 days. Egg hatching success noticeably decreased under predation risk, and the incubation period was significantly prolonged; however, the oviposition height of the snails was not affected. A lethal effect of predation risk was detected in juvenile snails but not in adults. The growth of juvenile P. canaliculata was inhibited under predation risk, probably due to a reduction in food intake. Adult females exhibited a greater reduction in growth under predation risk than males, which likely resulted in part from the high reproductive investment of females in egg laying. These results indicate that P. canaliculata snails under predation risk face a trade-off between predator avoidance and growth and reproduction, where the lethal effect of predation risk is linked to the size of the prey.捕食风险下入侵物种的行为已得到广泛研究，但针对其生长与繁殖响应的探讨却较为匮乏。本研究以入侵性淡水螺福寿螺（Pomacea canaliculata）的幼体与成体为实验材料，观测其在笼养捕食者红耳龟（Trachemys scripta elegans）带来的捕食风险下的生长与繁殖变化。与无捕食风险的对照组相比，存在捕食者及受伤同种个体时，福寿螺会提前产卵，但15天后，对照组的单雌产卵块总数反而超过实验组。捕食风险环境下，卵的孵化成功率显著降低，孵化期明显延长，但螺类的产卵高度未受影响。捕食风险对幼螺具有致死效应，但对成螺无此影响。捕食风险下幼螺的生长受到抑制，这可能与其摄食量下降有关。成体雌螺在捕食风险下的生长抑制程度显著高于雄螺，这一现象部分源于雌螺在产卵过程中较高的繁殖投入。本研究结果表明，处于捕食风险中的福寿螺需在躲避天敌与生长繁殖之间权衡取舍，且捕食风险的致死效应与猎物体型密切相关。