We present the techniques of qualitative analysis of complex communities and discuss the impact of climate change as a press perturbation. In particular, we focus on the difficult problem of disease and parasites embedded in animal communities, notably zoonotic diseases. Climate change can potentially affect population densities of hosts and vectors, as well as their life expectancy. Recent advances may provide insight in predicting change in risk of zoonotic disease following climate shifts. We conclude that the impact of change on ecological communities can be profound but subtle, complex, and ambiguous, even under basic mathematical assumptions about the structure of a community when in equilibrium.

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