Abstract
Predators play pivotal roles in driving population dynamics of marine organisms and structuring marine communities through consumptive effects, as well as exerting non-consumptive effects by inducing trait changes in their prey in response to perceived predation risk. While the consequences of such effects for predator–prey systems are well recognized, their implications for parasite–host interactions have only recently been explored. Understanding how predators affect disease dynamics through changes in host density, behavior, and physiology is increasingly important in light of both large-scale predator declines as well as rewilding initiatives that often consist of reintroducing predators. In this chapter, the authors provide a conceptual framework for the consumptive and non-consumptive effects of predators on parasites and infectious diseases and illustrate such effects with empirical examples from marine systems. In addition, they identify gaps in current knowledge and highlight open questions for future research.