The first set of UD Citizen Monitoring Reports for 2017 covering April and May.
April tended to be warmer and drier than usual, but May tended to be cooler and wetter.
Low Dissolved Oxygen readings (<4 ppm) began to be detected in some residential canals and upper tributaries in April. Severely low readings (<2 ppm) were restricted to a few canal systems. Note that this report only lists DO readings less than 5 ppm.
Minor accumulations of Nuisance Aquatic Vegetation were widespread. Major accumulations of filamentous green algae formed floating mats in several canal systems. Decay of algae may have contributed to low dissolved oxygen readings.
Total Enterococcus (TE) bacteria levels were elevated in a few locations in late May and may have been related to recent heavy rain.
At the Indian River Inlet and in the lower DE Bay, blooms of potentially toxic algae were limited to low levels of Pseudonitzchia in April and low levels of Dinophysis acuminata in May. A bloom of Dinophysis was seen in a canal system, so outside of approved shellfish harvesting areas. A few blooms of non-toxic centric diatoms and Cryptomonads were seen in tributaries and canals.