The Black-throated Green Warbler has a yellow face and green back. In breeding-plumage males, black across the throat and chest is prominent; females and young birds have less black on the front.
Adult males have a bright yellow face and extensive black from the throat onto the chest. Females and young birds are duller, with less black on the front and two white wingbars.
In Alberta’s boreal forest, researchers followed Black-throated Green Warbler occupancy at 114 sites from 1993 to 2018. A dynamic occupancy model estimated that occupancy probability fell from 0.67 to 0.284, corresponding to 77 versus 32 occupied sites. Surveys included repeated visits each year, and the model accounted for birds that were present but not detected.
Sites farther from seismic lines and harvested edges had higher persistence, while edge distance did not affect colonization. The study also found that regenerating harvest edges did not remove the persistence difference during the 25-year study period. The average annual persistence probability was 0.83, with substantial variation among years.
An extinction-risk assessment has not been added yet.
Across 114 Alberta sites, persistence was higher farther from seismic lines and harvested edges, and the difference remained detectable after 25 years. Retaining mature forest interiors and monitoring linear clearings over time can help track habitat conditions for this warbler.