Fig. 5. Location map for the large scale observational program and the extent of computation domains for modeling elements I-IV (see text for details; sampling and mooring positions are approximate). A subset of the indicated stations will be sampled for zooplankton community composition, food web toxicity, and Alexandrium cyst abundance. See Fig. 4D for the location of the higher resolution hydrographic sampling stations in Casco Bay. Several key shellfish toxicity monitoring stations along the coast, run by state agencies, are also shown, while offshore shellfish samples on Georges Bank will be obtained and processed by NMFS. The background shades of blue indicate depth ranges: 0-30 m, 60-100 m, 100-200 m, 200-500 m, 500-4000 m.