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Logic for designing nature reserves for multiple species.

Michael A McCarthy1, Colin J Thompson, Nicholas S G Williams

  • 1Australian Research Centre for Urban Ecology, Royal Botanic Gardens Melbourne and School of Botany, University of Melbourne, Parkville, Victoria 3010, Australia. mamcca@unimelb.edu.au

The American Naturalist
|May 4, 2006
PubMed
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Designing effective nature reserves requires balancing species extinction risk and occurrence. Optimal reserve size increases with extinction probability, while endemism patterns guide reserve location for better conservation outcomes.

Area of Science:

  • Conservation Biology
  • Ecological Modeling
  • Reserve Design

Background:

  • Integrating representativeness and persistence is crucial for effective nature reserve design.
  • Understanding species' extinction risk, occurrence rates, and distribution is key to conservation planning.

Purpose of the Study:

  • To examine the logic of nature reserve design by integrating representativeness and persistence.
  • To evaluate how species' extinction risk, occurrence, and distribution influence reserve system viability.

Main Methods:

  • Utilized simple viability models to assess reserve system performance.
  • Analyzed the impact of varying extinction risks, occurrence rates, and species distributions.
  • Incorporated species-specific differences into reserve design optimization.

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Main Results:

  • Optimal reserve size is influenced by the mean and variance of species extinction probability and the cost-effectiveness of risk reduction.
  • Species occurrence rates and accumulation with area had minor effects on optimal reserve size.
  • Endemism patterns significantly impacted reserve location decisions.
  • Considering species-specific traits reduced the number of reserves needed under a fixed budget.

Conclusions:

  • Nature reserve design must account for species-specific extinction risks and endemism for optimal outcomes.
  • Small grassland reserves can hold significant conservation value, as shown in the Melbourne case study.
  • Current conservation networks may underrepresent certain valuable habitats, like Melbourne's volcanic plains.