Nature creates its own density column in marine systems, which is extremely important for the triggering of the spring bloom of phytoplankton. Phytoplankton are an important food source for all organisms- from microscopic zooplankton to large marine mammals such as walrus and whales. The different salinities (and therefore, different densities) of water help to stabilize the water column (by limiting
Gary Wesche, a PolarTREC teacher and board president of the Blue River Watershed Association, operated a community cleanup along with more than 30 of his students at St. John Francis Regis School. The head of the EPA was also on hand for the event.