PIF population trend - continental

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Population Trend (PT-c) indicates vulnerability due to the direction and magnitude of recent changes in population size. Like the threats scores, PT-c actually reflects trends only within North America, even for species with ranges that extend beyond the continent. It is therefore a continental, rather than a global, score. Species that have declined by 50% or more over 30 years are considered most vulnerable, whereas species ... more

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  • PT-c

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