One of the most challenging questions in environmental biology today is how human-accelerated changes in multiple environmental variables are influencing natural communities and ecosystems. One of the more pervasive of these changes is the increase in UVR related to stratospheric ozone depletion. In recent years it has become increasingly clear that climate change may have at least as great an effect as ozone depletion on future changes in underwater UV environments in mid to high latitude freshwater ecosystems [1-4]. Here we briefly summarize previous studies that deal with interactions between climate change and UV effects on aquatic ecosystems, and discuss some of the quantitative modeling approaches that are being used to look at UV impacts. Photochemical transformations in DOM that play such a key role in climate change-UV interactions are dealt with in more detail in another chapter in this volume (Chapter 6).

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