Biology / Bio 3713 · Atom · ~20 seconds
How an Extinction-Risk Assessment Is Constructed
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A risk assessment combines field-survey population estimates, per Bio 3545, trend data, and range mapping, evaluated against fixed numeric thresholds.
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Comparing a species' current range against its historic extent quantifies the decline one criterion requires.
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Assuming one data source suffices is the error — population, trend, and range combine into one assessment.