Data from: The behavioral type of a top predator drives the short-term dynamic of intraguild predation

Variation in behavior among individual top predators, i.e. the behavioral type, can strongly shape pest suppression in intraguild predation (IGP). However, the effect of a top predator's behavioral type, namely foraging aggressiveness (no. of killed prey / time) and prey choosiness (preference degree for certain prey type), on the dynamic of IGP may interact with the relative abundances of top predator, mesopredator, and pest. We investigated the influence of the top predator's behavioral type on the dynamic of IGP in a three-species system, a top predator spider, a mesopredator spider, and a psyllid pest, using a simulation model. The model parameters were estimated from laboratory experiments and field observations. The top predator's behavioral type altered the food-web dynamics in a context-dependent manner. The system with an aggressive / non-choosy top predator, without prey preferences between pest and mesopredator, suppressed the pest more when the top predator to mesopredator abundance ratio was high. In contrast, the system with a timid / choosy top predator that preferred the pest to the mesopredator was more effective when the ratio was low. Our results show that the behavioral types and abundances of interacting species need to be considered together when studying food-web dynamics as they evidently interact. To improve biocontrol efficiency of predators, research on the alteration of their behavioral types is needed.顶级捕食者个体间的行为差异（即行为型，behavioral type）可显著调控集团内捕食（intraguild predation, IGP）系统中的害虫抑制效果。然而，顶级捕食者的行为型——具体包括觅食攻击性（foraging aggressiveness，量化指标为被捕杀猎物数/时间）与猎物选择性（prey choosiness，即对特定猎物类型的偏好程度）——对IGP系统动态的影响，可能会与顶级捕食者、中层捕食者（mesopredator）以及害虫的相对丰度产生交互作用。本研究采用仿真模型，针对由顶级捕食性蜘蛛、中层捕食性蜘蛛以及木虱害虫（psyllid pest）构成的三物种种群系统，探究了顶级捕食者行为型对IGP系统动态的影响。模型参数均通过室内实验与野外观测数据估算得到。结果表明，顶级捕食者的行为型会以环境依赖的方式改变食物网动态：当顶级捕食者与中层捕食者的丰度比值较高时，拥有高攻击性且无猎物偏好（即对害虫与中层捕食者无明显取食偏好）的顶级捕食者的系统，其害虫抑制效果更佳；与之相反，当该丰度比值较低时，拥有低攻击性且具有猎物选择性（偏好取食害虫而非中层捕食者）的顶级捕食者的系统，害虫抑制效果更为显著。本研究结果显示，在探究食物网动态时，需同时考虑交互物种的行为型与种群丰度，因为二者间存在显著的交互效应。为提升捕食者的生物防治效能，亟需开展针对其行为型调控的相关研究。