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(NAS Colloquium) The Future of Evolution (2002) / Chapter Skim
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Loss of Speciation Rate Will Impoverish Future Diversity
Pages 16-22

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From page 16...
... Both rates speciation and extinction depend in part on the geographical range sizes of species. Larger ranges tend to increase the speciation rates and decrease the extinction rates of otherwise similar species.
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From page 17...
... , and the inverse correlation of extinction rate with area (1~. Interprovincial Patterns in Steady States of Species Diversity The influence of diversity on average species' range size produces a negative feedback system in which species diversity is self-regulating (1~.
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From page 18...
... To explain their doubt, they point to two real phenomena biotic reserves and diversity hot spots and the hope associated with combining them. Biotic reserves constitute a collection of relictual habitats scattered all over the world.
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From page 19...
... It underscores the fact that diversity is the outcome of dynamical processes, whereas hot spots constitute a static view of diversity. The differences among the scales of species-area relationships and their z-values provide a dynamic basis for predicting what will happen to species diversity and to speciation in the future.
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From page 20...
... . Extinction rates have positive second derivatives; speciation rates have negative second derivatives.
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From page 21...
... In turn, provincial diversity determines local diversity local diversity can only echo provincial diversity. Thus, if the area available to native species remains very low or declines even farther, the loss of speciation rate will prevent even our biotic preserves from maintaining their diversities for very long.
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From page 22...
... (1975) Evolution and Extinction Rate Controls (Elsevier Scientific Publications, Amsterdam)
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Key Terms

  • species diversity
  • speciation rate
  • extinction rate
  • extinction rates
  • steady states

  • reconciliation ecology
  • mass extinction
  • conservation biology
  • provincial diversity
  • larger ranges

  • hot spots
  • native species
  • wild species
  • pine forest
  • speciation rates

  • salt marsh
  • sink species
  • biogeographical province
  • global warming
  • fossil record

  • range size
  • biotic reserves
  • geographical range
  • mass extinctions
  • force base

  • local diversity
  • lizard species
  • echo patterns
  • population size
  • eglin air


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