Seasonal distribution of harbour porpoises in US Atlantic waters

The seasonal distribution of harbour porpoises in US Atlantic waters is explored by examining aerial sightings made by the Cetacean and Turtle Assessment Program (CeTAP) survey between 1978 and 1988. These sightings and the annual aggregation in the summer months around the entrace to the Bay of Fundy are discussed in relation to population identity, while a possible shift in the spring-time distribution from the late 1970s to the late 1980s and early 1990s is also noted.