Salpa aspera forms large, periodic summer swarms in the northwest Atlantic Ocean between Massachusetts and North Carolina. Differently-shaded areas on this map show the locations and extent of salp swarms in each of two summers. Numbers 1-3, 4-5, and letters A-B indicate locations having dense salps in three additional summers. Some swarms covered more than 38,000 square miles of the ocean. Contour lines show bottom depths. (Map courtesy of Laurence Madin, Woods Hole Oceanographic Institution)[back]
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