Boat field trip in Boston Harbor with Columbia Point. Boston Harbor sampling stations: 1. Neponset River – mouth 2. Thompson Island 3. Deer Island Anchorage. http://www.nps.gov/boha/pphtml/subnaturalfeatures14.html. Plankton net Copepods.
Boston Harbor sampling stations:
1. Neponset River – mouth
2. Thompson Island
3. Deer Island Anchorage
Niskin bottle – collecting water from specific depths for e.g. concentrations of chlorophyll-a, nitrogen, phosphorous, and fecal coliform bacteria;
Secchi disk – for measuring transparency/clarity of the water
Photosynthetically Active Radiation (PAR) – light attenuation coefficient Kd;
Calculating euphotic depth in the oceans;
Dense meadows of seagrass are characteristic of pristine, shallow depositional environments in New England. A century ago, seagrass meadows covered hundreds of acres of subtidal flats of Boston Harbor. Important nursery areas for young fish and shellfish, these meadows had all but vanished by the late 1980s, victims of turbid water, viral diseases, and excessive nutrients which promote the growth of algae on seagrass leaves.Boston Harbor supports small areas of seagrasses. With the reduction in nutrients in the water and the increase in clarity, especially in the South Harbor, we might expect to see recolonization of the harbor floor by these important habitats in the years to come.
DITP = Deer Island Treatment Plant
In the harbor and rivers, photosynthesis is carried out by algae (or phytoplankton), microscopic plants suspended in the water column. To determine the amount of algae in the water, we measure chlorophyll. High chlorophyll concentrations indicate an overabundance of nutrients in the water, which can result in elevated algae levels, or algal blooms. Algal blooms can deplete bottom-water dissolved oxygen, reduce water clarity, and impair recreational uses. Chlorophyll concentrations greater than 12 micrograms per liter in the Harbor and 25 micrograms per liter in the rivers indicate an overgrowth of algae.