Figure 1. Five Alexandrium habitats in the northeastern U.S. (Black boxes), defined by circulation patterns and the discontinuous distribution of the dinoflagellate. These are: (1) EMCC-eastern Maine coastal current; (2) WMCC-western Gulf of Maine coastal current; (3) MB-Massachusetts Bay; (4) Georges Bank; and southern salt ponds and embayments. Qualitative surface circulation patterns are indicated by arrows. Other abbreviations are as follows: BOF-Bay of Fundy; ME-Maine; PB-Penobscot Bay; CB-Casco Bay.