Benthic Video Blog
The boat crew conducted a benthic video survey along the Edgewood transect on April 11th. Scale lasers were used in the footage, separated by 28 cm. Visibility through the water column was moderate to good. The bottom was characterized by sands and muds, with a few boulders and cobbles observed sporadically. There was some bushy growth of diatoms or a filamentous brown alga (see photo) throughout the transect, though coverage was never extensive. Kelp was also observed, a first for this transect! Additional common sights included large burrows, likely from mantis shrimp (Squilla); many small burrows and associated fecal mounds; and occasional Nassariid mudsnails. Amphipod tube mats were not observed.
Benthic Video Blog
The boat crew conducted a benthic video survey along the Sabin transect on March 27th. Unfortunately, one of the scale lasers failed during deployment, so only one beam was visible in footage. Visibility through the water column was good, and interesting observations were made. The bottom was characterized by muddy sand with some areas of extensive shell hash and rubble. Some boulders were observed, but the boat missed the main boulder field often observed along this transect. There was a lot of bushy algae or diatom growth observed, typical for the early spring, as well as small patches or rafts of Ulva. Extensive areas of kelp were also observed (see photo) on the east side of the shipping channel; these are the first observations of kelp in NBC benthic video monitoring! As usual, some litter was also observed along the transect. Additional common sights included small burrows and tubes built by infauna (e.g., parchment tube worms, Chaetopteridae) and dense assemblages of Nassariid mudsnails. Dense areas of amphipod tube mats and Beggiatoa bacteria growth were not observed this week.
Benthic Video Blog
R/V Monitor's Blog
On Wednesday, November 28th, the crew of the R/V Monitor was out on the upper Bay collecting bacteria samples, taking Secchi Disk and Par sensor water clarity measurements, conducting water column profiles using the Seabird instrument, and conducting real-time surface mapping of water quality parameters, including dissolved oxygen, chlorophyll, water temperature, salinity, and pH, all in an effort to document water quality improvements associated with NBC construction projects. Sara captained the boat while monitoring professionals Fern and Mike collected the samples and data. It was a cool day with winds out of the south, making the water choppy. Below is a photo taken this day of Phillipsdale landing in the Seekonk River, where NBC's fixed site monitoring station is located.
The fecal coliform geometric mean increased from the previous sampling to 482 MPN/100 mL. Fecal coliform concentrations were higher in the Providence River (geometric mean: 593 MPN/100 mL) than in the Seekonk River (geometric mean: 310 MPN/100 mL). The maximum fecal coliform concentration of 2300 MPN/100 mL was measured in the Providence River at Gaspee Point. The greatest fecal coliform value in the Seekonk River, 930 MPN/100 mL, occurred at the Narragansett Boating Center and in one of the Phillipsdale Landing samples. Geometric mean results indicate both rivers exceeded primary contact and shellfishing standards.
The overall enterococci geometric mean was 347 MPN/100 mL. Concentrations ranged from approximately 252 MPN/100 mL at Phillipsdale Landing (geometric mean of two duplicates) to 703 MPN/100 mL at Point Street Bridge. The geometric mean of all results exceeded the state primary contact standard.
Please note: the results of NBC's fecal coliform and enterococci monitoring are for informational/research purposes only and are not intended to suggest official state compliance with bathing or shellfishing standards.