Datum semináře: 
Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany

Systematic investigations of predator-prey interactions as the core elements of natural food webs have long since identified that body size is the single most important trait driving these interactions. Further research shows that so far unexplained variation in trophic interaction strengths might be caused by consistent differences in behavioral traits. In the first part of this presentation I will demonstrate based on examples from fish and insects how the functional response framework can be used to explain these relationships in a systematic and mechanistic way that enables upscaling to the whole food web level. In the second part of my presentation I will look at how body size and intraspecific variation affect the interactions among humans and wildlife, or more broadly, biodiversity. A key finding is that human-animal interactions do not scale as universally with body size as do the interactions among natural predators and their prey. Despite complex relationships we can learn useful lessons from these size-based approaches that can inform how we tackle management and conservation issues like invasive species and other biodiversity threats.

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