Includes bibliographical references and index.

Solar radiation as an ecosystem modulator -- Physics -- UVR climatology -- Water column optics and penetration of UVR -- Modulation of UVR exposure and effects by vertical mixing and advection -- Solar UVR and aquatic carbon, nitrogen, sulfur and metals cycles -- Photochemistry of chromophoric dissolved organic matter in natural waters -- Photoactivated toxicity in aquatic environments -- Reactive oxygen species in aquatic ecosystems -- UVR-induced DNA damage in aquatic organisms -- Photoprotective physiological and biochemical responses of aquatic organisms -- Photosynthesis in the aquatic environment as affected by UVR -- UVR and pelagic metazoans -- UVR-induced inhjuries in freshwater vertebrates -- Behavioral responese : UVR avoidance and vison -- UVR and its effects on species interactions -- Past UVR environments and impacts on lakes -- UVR effects on aquatic ecosystems : a changing climate perspective.