Quantifying and valuing potential climate change impacts on coral reefs in the United States: comparison of two scenarios.

The biological and economic values of coral reefs are highly vulnerable to increasing atmospheric and ocean carbon dioxide concentrations. We applied the COMBO simulation model (COral Mortality and Bleaching Output) to three major U.S.

Differential responses of tallgrass prairie species to nitrogen loading and varying ratios of NO3- to NH4.

Worldwide atmospheric N deposition varies in both quantity and composition of inorganic N forms (NO3 and NH4). Many studies designed to assess the potential consequences of N pollution, however, pay little attention to the relative abundance of N forms. We hypothesized that native species with different physiological properties will show varying responses to different forms and amounts of N deposition.