Data for: Parasitism risk and infection alter host dispersal

Dispersal determines the spatial dynamics of host-parasite assemblages, particularly during invasions and disease epidemics. The risk of parasitism may create an incentive for dispersal, but infection is expected to reduce dispersal ability, which may alter the host’s dispersal response to biotic stressors including population density. We measured the dispersal of the semi-aquatic insect, Notonecta undulata, in aquatic mesocosms in which we manipulated the presence of ectoparasitic Hydrachnidia mites and of infected conspecifics. We found that parasitism risk increases host dispersal propensity. Using a flight assay, we determined that parasite infection reduces host dispersal ability. Finally, we used a mark-release-recapture study to investigate the joint effects of both parasitism risk and parasite infection on host dispersal in a natural, spatially structured population. We found that parasitism risk reduced dispersal probability, eliminated positive density-dependent dispersal, and...扩散决定了宿主-寄生虫组合群落的空间动态，尤其在生物入侵与疾病流行阶段。寄生虫感染风险可能会催生宿主的扩散动机，但感染本身则会降低宿主的扩散能力，这一效应或会改变宿主对包括种群密度在内的生物胁迫因子的扩散响应。我们在水生中宇宙（aquatic mesocosms）实验系统中操控了外寄生水螨（Hydrachnidia）与受感染同种个体的有无，以此测定半水生昆虫仰泳蝽（Notonecta undulata）的扩散行为。研究发现，寄生虫感染风险会提升宿主的扩散倾向。通过飞行测定实验，我们证实寄生虫感染会降低宿主的扩散能力。最后，我们借助标记-重捕（mark-release-recapture）研究，在一个具有空间结构的自然种群中探究了感染风险与感染状态二者对宿主扩散的联合效应。结果显示，寄生虫感染风险会降低宿主的扩散概率，并消除了正密度依赖扩散现象，且……