The abundance change maps provide a pairwise view of a suite of combinations of current (1961-1990 baseline) conditions vs. The value is the bases for modeling and projecting bird incidence across the eastern US. The BBS Incidence (on a scale of 0 – 1) represents the proportion of times a species was observed on a route over a decade. The legend shows the incidence values (IV) of the species as calculated from the North America Breeding Bird Survey data (BBS).
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