Adam C Smith bird trendsSpatial and temporal patterns in population change for Barn Swallow, from the North American Breeding Bird Survey #NABBS.
Increasing across most of its range until the early 1980s. Since then decreasing and most strongly in the north.
This change-point in the 1980s is common for most species of swallows, swifts, and nightjars in North America.
#BiologicalMonitoring #AerialInsectivore #BiodiversityLoss
Increasing across most of its range until the early 1980s. Since then decreasing and most strongly in the north.
This change-point in the 1980s is common for most species of swallows, swifts, and nightjars in North America.
#BiologicalMonitoring #AerialInsectivore #BiodiversityLoss
