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      Large predators and trophic cascades in terrestrial ecosystems of the western United States

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      Biological Conservation

      Elsevier BV

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          Terrestrial Ecoregions of the World: A New Map of Life on Earth

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            Community Structure, Population Control, and Competition

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              Long-term aridity changes in the western United States.

              The western United States is experiencing a severe multiyear drought that is unprecedented in some hydroclimatic records. Using gridded drought reconstructions that cover most of the western United States over the past 1200 years, we show that this drought pales in comparison to an earlier period of elevated aridity and epic drought in AD 900 to 1300, an interval broadly consistent with the Medieval Warm Period. If elevated aridity in the western United States is a natural response to climate warming, then any trend toward warmer temperatures in the future could lead to a serious long-term increase in aridity over western North America.
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                Author and article information

                Journal
                Biological Conservation
                Biological Conservation
                Elsevier BV
                00063207
                November 2009
                November 2009
                : 142
                : 11
                : 2401-2414
                10.1016/j.biocon.2009.06.015
                © 2009

                http://www.elsevier.com/tdm/userlicense/1.0/

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