Invasive alien species impacts might be mediated by environmental factors such as climatic warming. For invasive predators, multiple predator interactions could also exacerbate or dampen ecological impacts. These effects may be especially pronounced in highly diverse coastal ecosystems that are prone to profound and rapid regime shifts. We examine emergent effects of warming on the strength of intraspecific multiple predator effects from a highly successful invasive gammarid Gammarus tigrinus, using a functional response approach towards larval chironomids (feeding rates under different prey densities). Single predator maximum feeding rates were three-times higher at 24 °C compared to 18 °C overall, with potentially prey destabilising type II functional responses exhibited. However, pairs of gammarids exhibited intraspecific multiple predator effects that were in turn mediated by temperature regime, whereby synergisms were found at the lower temperature (i.e. positive non-trophic interactions) and antagonisms detected at the higher temperature (i.e. negative non-trophic interactions) under high prey densities. Accordingly, warming scenarios may worsen the impact of this invasive alien species, yet implications of temperature change are dependent on predator–predator interactions. Emergent effects between abiotic and biotic factors should be considered in ecological impact predictions across habitat types for invasive alien species.

外来入侵物种的影响可能是由气候变暖等环境因素引起的。对于侵入性捕食者，多种捕食者的相互作用也可能加剧或减弱生态影响。这些影响在高度多样化的沿海生态系统中尤其明显，这些生态系统易于发生深刻而迅速的政权转移。我们研究了从高度成功的侵入gammarid变暖对种内多捕食影响力的新兴影响钩虾虎纹，使用针对幼虫尺虫（不同猎物密度下的进食速度）的功能响应方法。单个捕食者的最大摄食率在24°C时比整体18°C高三倍，并且表现出潜在的破坏II型功能的猎物反应。然而，成对的γ-内酰胺类动物表现出种内的多种捕食者效应，这些效应又由温度机制介导，从而在较低温度下发现协同作用（即正非营养相互作用），在较高温度下发现拮抗作用（即负非营养相互作用）。在高密度的猎物下 因此，变暖的情况可能会使这种外来入侵物种的影响恶化，但温度变化的影响取决于捕食者与捕食者之间的相互作用。