Powered by eBirdTrends 2011-2021
Non-breeding Season, 27日 12月 - 15日 2月
This map depicts the cumulative change in estimated relative abundance from 2011 through 2021 with circles representing 27km x 27km regions. Red indicates decline and blue indicates increase. The darker the color, the stronger the trend. White circles represent locations where the trend estimate is not significantly different from zero (i.e., the 80% confidence interval contains zero). Circle sizes are scaled by the estimated relative abundance at the middle of the time period.
了解更多Abundance Trend
Pct. Change, 2011-2021
-30%-20-10Uncertain+10+20+30
LowerHigher
Regional Trend
Range-wide Trend (Confidence Intervals)
80% confidence interval, or range of values where the model is fairly confident the true trend could be, with it being most likely near the median value. 了解更多
-13.5% Upper
-18.4% Median
-22.9% Lower