Paratectonatica tigrina employs three predatory tactics against bivalve prey: wall-drilling, edge-drilling and non-drilling (suffocation) tactics. In this study, we conducted laboratory experiments to examine the predator–prey interactions between the naticid gastropod P. tigrina and two species of bivalve prey, Ruditapes philippinarum and Meretrix lusoria, and to investigate how predatory tactics differ for the bivalve species. Predation success increased with the shell weight ratio between predator and prey, however, there was no significant difference among prey species. The shell weight ratio significantly differed (P < 0.05) between predatory tactics against R. philippinarum, but not against M. lusoria, implying that P. tigrina determines its predatory tactics based on the shell weight ratio for R. philippinarum. However, we observed that feeding duration was not influenced by shell weight ratio or prey species, even though data were separated for each predatory tactic. These results suggest that there is no difference in feeding efficiency based on shell weight ratio between prey species and between predatory tactics. Paratectonatica tigrina may alter its predatory tactics suitably depending on the prey species and the relative size difference, despite the same feeding efficiency.

中文翻译：

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Paratectonatica tigrina (Gastropoda: Naticidae) 根据所选择的猎物及其相对于自身的壳重量调整其捕食策略

虎皮蠹对双壳类猎物采用三种掠夺性策略：钻墙、钻边和不钻（窒息）策略。在这项研究中，我们进行了实验室实验来检查水螅腹足动物之间的捕食者 - 猎物相互作用P. tigrina和两种双壳类猎物，菲律宾蛤仔和Meretrix lusoria，并研究双壳类动物的捕食策略有何不同。捕食成功率随着捕食者和猎物的壳重比的增加而增加，但猎物物种之间没有显着差异。壳重比显着不同（磷< 0.05) 掠夺性策略之间R. philippinarum，但不反对M. lusoria, 意味着P. tigrina根据壳重比确定其掠夺策略R. philippinarum。然而，我们观察到进食持续时间不受壳重比或猎物种类的影响，即使每种捕食策略的数据都是分开的。这些结果表明，基于壳重比的猎物物种和捕食策略之间的摄食效率没有差异。虎皮蠹尽管摄食效率相同，但可能会根据猎物种类和相对大小差异适当改变其捕食策略。