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May 23, 2014 - ESP Update

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The 3 ESPs deployed in the western Gulf of Maine continued to work hard this week while we were ground truth sampling in the region on Tuesday (May 20), Wednesday (May 21), and Thursday (May 22).

Results show a rapid increase in the Alexandrium fundyense population in the range of 500-700 cells/Liter at ESP-1 (don) near NERACOOS B and ESP-2 (jake) at the mouth of Casco Bay. 

Live counts of Alexandrium sp. at the mooring sites and in the adjacent offshore region confirm the validity of the ESP estimates of the population, but were confounded by the presence of Alexandrium ostenfeldii. The NA1 probe is specific for A. fundyense in the Gulf of Maine and does not detect A. ostenfeldii. The lack of detection on the hab array at ESP-3 (dennis) off Pemiquid Point is correct as well. Few Alexandrium cells were observed at that site, but just 2.5 nautical miles further offshore, a significant number of Alexandrium cells (hundreds/L) were detected by the live count method. This suggests that the bloom is coming into the region between NERACOOS E and ESP-3 and intensifies further downstream in the Kennebec River plume.  

Bruce Keafer (Research Associate in the Anderson Lab)

Last updated: July 1, 2019

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