First-ever U.S. national wild bee map reveals farmland at risk

Maps of status, uncertainty, trend, and impacts of wild bees across the coterminous United States. (A) Status of wild bee abundance (relative index)for 2013. (B) Uncertainty (SD estimate) of wild bee abundance index for 2013. (C) Trends in wild bee abundance and its uncertainty (the likelihood of changes: pseudo-t values) between 2008 and 2013. (D) Status of supply of wild bees (model-predicted abundance from A) and demand for pollination services (summed area of animal-pollinated crops, weighted by their pollinator dependence) at a county scale for 2013. Counties with less than 1,000 ha of pollinator-dependency weighted crop area were left white. (E) Uncertainty in the supply of wild bees in 2013 for the counties identified as supply/demand mismatches in D. (F)Trend of supply and demand between 2008 and 2013 (zones I and II indicate high and low likelihood of decreases in supply, respectively).


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