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Use of standardized methods to improve extinction-risk classification
Caitlin C Mothes1, Stephanie L Clements1, Dishane K Hewavithana1
1Department of Biology, University of Miami, 1301 Memorial Drive, Coral Gables, FL 33146, U.S.A.
Summary
Standardized risk assessment is crucial for species protection. Current US listing decisions lack objectivity, as federal protections align with risk, but state protections do not, highlighting the need for quantitative methods.
Area of Science:
- Conservation Biology
- Ecology
- Environmental Policy
Background:
- Standardized classification methods using quantifiable risk metrics enhance objectivity, consistency, and transparency in species listing decisions.
- Currently, neither federal nor state agencies in the US employ standardized methods for listing species, potentially leading to decisions misaligned with actual extinction risk.
- California herpetofauna were used as a case study to examine discrepancies in listing decisions made without standardized methods.
Purpose of the Study:
- To evaluate the discrepancies in species listing decisions by comparing quantitative risk metrics with current listing status.
- To increase transparency in past listing decisions by identifying the most weighted criteria using classification tree analysis.
- To advocate for the adoption of standardized, quantitative methods for conservation risk assessment.
Main Methods:
- Applied a recently developed set of quantitative risk metrics to California herpetofauna.
- Utilized classification tree analysis to identify key predictors of listing status.
- Compared risk metric scores between federally and state-listed species and non-listed species.
Main Results:
- Federally listed California herpetofauna exhibited significantly higher risk scores compared to non-federally listed species.
- State-listed species did not show higher risk scores than non-state-listed species.
- Classification trees identified state endemism as the primary predictor for state listing status, and distribution and population trends as key federal listing predictors.
Conclusions:
- The adoption of standardized, quantitative methods for conservation risk assessment is essential for governing bodies.
- Standardized methods enhance transparency by revealing criteria influencing listing decisions and allow for unbiased threat comparisons.
- Implementing quantitative criteria promotes consistency, efficiency, and effectiveness in species protection processes.
Keywords:
classification treesconservation prioritycriterios de listadodecisiones de listadoespecies amenazadasevaluación del riesgolisting criterialisting decisionsmedidas cuantitativas del riesgoprioridad de conservaciónquantitative risk metricsrisk assessmentthreatened speciesárbol de clasificación保护优先性分类树受胁迫物种定量风险指标濒危物种名录决策濒危物种名录标准风险评估
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