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      Regulation of diversity: maintenance of species richness in changing environments

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      Oecologia

      Springer Nature

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          Abstract

          In order to assess how diversity changes over time at sites undergoing environmental change, we examined three data sets on long-term trends in taxonomic richness and composition: (1) 22 years of rodent censuses from a site in the Chihuahuan Desert of Arizona; (2) 50 years of bird surveys from a three-county region of northern Michigan; and (3) approximately 10,000 years of pollen records from two sites in Europe. In all three cases, richness has remained remarkably constant despite large changes in composition. The results suggest that while species composition may be highly variable and change substantially in response to environmental change, species diversity is an emergent property of ecosystems that is often maintained within narrow limits. Such regulation of diversity requires maintenance of relatively constant levels of productivity and resource availability and an open system with opportunity for compensatory colonizations and extinctions. In addition to studying the effects of diversity on biogeochemical processes, it will often be useful to think of species richness as an emergent consequence of ecosystem processes.

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          Author and article information

          Journal
          Oecologia
          Oecologia
          Springer Nature
          0029-8549
          1432-1939
          February 2001
          February 2001
          : 126
          : 3
          : 321-332
          Article
          10.1007/s004420000536
          28547444
          © 2001

          http://www.springer.com/tdm

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