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Digital representation of Brown and Lowe's "Biotic Communites of the Southwest" map (1979) developed by The Nature Conservancy in Arizona (2004).
In the western United States vast acreages of land are exposed to low levels of atmospheric nitrogen (N) deposition, with interspersed hotspots of elevated N deposition downwind of large, expanding metropolitan centers or large agricultural operations. Biological response studies in western North America demonstrate that some aquatic and terrestrial plant and microbial communities are significantly altered by N deposition. Greater plant productivity is counterbalanced by biotic community changes and deleterious effects on sensitive organisms (lichens and phytoplankton) that respond to low inputs of N (3 to 8 kilograms N per hectare per year). Streamwater nitrate concentrations are elevated in high-elevation catchments...
    map background search result map search result map Brown and Lowe's Biotic Communities of the Southwest Brown and Lowe's Biotic Communities of the Southwest