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Cover: The rainforests and cloud forests surrounding Pongo de Mainique, a canyon on the Urubamba River in Peru, have extraordinarily high species richness. As climate changes, the region is projected to have one of the highest rates of turnover of amphibian species in the western hemisphere. Th e special section in this issue, “Ecological Responses to Contemporary Climate Change within Species, Communities, and Ecosystems,” provides a foundation for better understanding and preparation for shifts in climate forcings and feedbacks.