PIF population size score - global

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Population Size (PS-g) indicates vulnerability due to the total number of adult individuals in the global population. Scores were assigned using population estimates derived primarily from abundance data collected by the North American Breeding Birds Survey (BBS), extrapolated after various adjustments to range size outside of BBS coverage; but other data on abundance were used when appropriate (Rich et al. 2004, Appendix B; Rosenberg and Blanche... more

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  • PS-g

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