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Reserve design and the SLOSS debate

Reserve design and the SLOSS debate. Letícia Soares Lost in Space October 4 th , 2011. Outline. Debate origins Theory sustaining the controversy What to focus in order to solve the problem Papers for discussion. Single Large or Several Small? When everything started.

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Reserve design and the SLOSS debate

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  1. Reserve design and the SLOSS debate Letícia Soares Lost in Space October 4th, 2011

  2. Outline • Debate origins • Theory sustaining the controversy • What to focus in order to solve the problem • Papers for discussion

  3. Single Large or Several Small?When everything started • Metapopulation models to access species richness in habitat patches. • Should refuges always consist of the largest possible single area?

  4. Single Large or Several Small?When everything started • Experimentally isolated Red Mangrove forest • Species richness of canopy arthropods.

  5. Single Large or Several Small?When everything started • Archipelago A supports the idea that a cluster of smaller patches might support more species than a single larger patch.

  6. Understanding the real debate • Single large always assumed to be the best strategy. • Empirical evidence was showing the value of several small. • Which way to go when planning conservation reserves?

  7. Why single large is intuitively good • 1) Species area relationship ‪S = cA‬z ; c=constant; z=slope Larger areas = higher habitat diversity = more species ‪log(S)= log(c)+ zlog(A)‬

  8. Why single large is intuitively good • Species area relationship – is that always true?

  9. Area response depends on the trophic groupDisruption of specific interactions

  10. Small patches are important for overall species richness • Small patches accumulate species faster than larger patches. • Habitat diversity

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