|Bird Conservation Region|
|5||Northern Pacific Rainforest|
|6||Boreal Taiga Plains|
|8||Boreal Softwood Shield|
|12||Boreal Hardwood Transition|
|14||Atlantic Northern Forest|
|16||Southern Rockies/Colorado Plateau|
|17||Badlands and Prairies|
|19||Central Mixed-grass Prairie|
|21||Oaks and Prairies|
|22||Eastern Tallgrass Prairie|
|23||Prairie Hardwood Transition|
|25||West Gulf Coastal Plain/Ouachitas|
|26||Mississippi Alluvial Valley|
|27||Southeastern Coastal Plain|
|30||New England/Mid-Atlantic Coast|
|33||Sonoran and Mojave Deserts|
|34||Sierra Madre Occidental|
Solid line represents model-estimated, route-level average abundance per year, and dashed lines represent 95% credible intervals for the averages.
N: number of BBS survey routes within BCRs that provided the data for estimates of abundance and population change.
λ (Greek letter Lambda): model-estimated average % annual population change. Parenthesized values represent the 95% credible interval for λ. Generally, if the 95% credible interval does not overlap zero (indicated by red or green graphs), then we can have a higher level of confidence in the trend’s reality, whereas credible intervals that overlap zero and are less reliable are indicated by orange graphs.
% population change is a simple ratio of average abundance estimates for 1966 and 2010.