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Species-area relationships (SARs) may overestimate extinction risks. This study argues that endemics-area relationships (EARs) are more appropriate for assessing biodiversity loss from habitat and climate change, challenging previous claims.

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Area of Science:

  • Ecology
  • Biodiversity Science
  • Conservation Biology

Background:

  • Species-area relationships (SARs) are commonly used to estimate extinction risks due to habitat loss or climate change.
  • He and Hubbell (2011) proposed using endemics-area relationships (EARs) instead of SARs, suggesting SAR-based estimates are too high.

Purpose of the Study:

  • To critically evaluate the methodology and conclusions presented by He and Hubbell (2011) regarding SARs and EARs for extinction risk assessment.
  • To demonstrate that SAR estimates of extinction risk are not necessarily biased and that empirical data used by He and Hubbell may be inappropriate for their analysis.

Main Methods:

  • Re-evaluation of statistical methods used in species-area relationship (SAR) analyses.
  • Analysis of empirical data concerning species distribution and habitat area.
  • Comparison of extinction risk estimates derived from SARs versus endemics-area relationships (EARs).

Main Results:

  • The SAR estimates of extinction risk are potentially biased and not inherently too high.
  • The empirical data utilized by He and Hubbell are not suitable for robust extinction risk calculations.
  • Previous arguments suggesting lower extinction risks from climate change are flawed, as species responses indicate significant future risks.

Conclusions:

  • SARs remain a valid tool for assessing extinction risks, contrary to the claims of He and Hubbell.
  • Species are already exhibiting responses to climate change consistent with substantial future extinction risks.
  • Accurate assessment of biodiversity loss requires careful consideration of methodology and appropriate empirical data.