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      Mammal population losses and the extinction crisis.

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          Abstract

          The disappearance of populations is a prelude to species extinction. No geographically explicit estimates have been made of current population losses of major indicator taxa. Here we compare historic and present distributions of 173 declining mammal species from six continents. These species have collectively lost over 50% of their historic range area, mostly where human activities are intensive. This implies a serious loss of ecosystem services and goods. It also signals a substantial threat to species diversity.

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          Author and article information

          Journal
          Science
          Science (New York, N.Y.)
          American Association for the Advancement of Science (AAAS)
          1095-9203
          0036-8075
          May 03 2002
          : 296
          : 5569
          Affiliations
          [1 ] Instituto de Ecologia, Universidad Nacional Autonoma de Mexico, Apdo, Postal 70-275, Mexico D.F. 04510, Mexico. gceballo@miranda.ecologia.unam.mx
          Article
          296/5569/904
          10.1126/science.1069349
          11988573
          e3d07b70-2a3c-4721-9248-cdda4b716559
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