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Downy woodpecker range map11/29/2023 Sum IV The sum of importance values (IV) across all cells. IV The average importance value (IV) across all 20x20 km cells that have been modeled to be suitable for the species. There are a total of 9767 cells used in the model. Potential Changes in Abundance and Range (Future) Percent Area Occupied The percent of 20x20 km cells within the total area of the eastern United States that have been modeled to be suitable for the species. 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). The pull-down menus allow any combination, and the animation button allows a flashing (on/off) view between selected scenarios. future (2071-2100) General Circulation Models (three different models and their "average") and two emission scenarios (B1, a 'Lo'- relatively high conservation emission scenario and A1fi, a 'Hi' - keep increase fossil fuel emissions). The abundance change maps provide a pairwise view of a suite of combinations of current (1961-1990 baseline) conditions vs.
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