The State of Boreal Chickadee
Regionally: Slightly increasing
In our region, sizable populations of Boreal Chickadees only occur in Maine, New Hampshire, and the Adirondacks of New York. Mountain Birdwatch data suggest that Boreal Chickadee populations in the northeastern United States have been gradually increasing since 2011 at a mean annual rate of 1.24% (95% Bayesian credible interval [BCI] = -1.99% to 4.38%). The North American Breeding Bird Survey results also support these trends over the last decade, but Boreal Chickadee numbers have overall declined by >50% since the 1970s in our Northern Atlantic Forest bird conservation region. The relatively low density of Boreal Chickadees is reflected in amount of uncertainty for their annual trend estimates in Maine (mean = 5.09%, 95% BCI = =1.36% to 11.95%), New Hampshire (mean = -2.73%, 95% BCI = =-7.03% to 1.73%), and the Adirondacks of New York (mean = 2.84%, 95% BCI = =-1.11% to 7.07%).
Globally: Declines compared to the 1970s, but recently more stable
Because they occupy remote areas without road access, and because they tend to be quiet and secretive during the breeding season, Boreal Chickadees are not well-monitored by the Breeding Bird Survey. Available data, though, suggest that populations of Boreal Chickadees have broadly declined, since the late 1960s, across most of the United States and Canada with the exception of Alaska and northwest Canada.