Canalisation of the stream has affected salinity and pollution levels in nearby tidal wetlands.
Many people come here in spring and summer for the excellent bird-watching on nearby wetlands.
The opponents say the proposed three-story sanctuary will overwhelm its eight-tenths of an acre site and endanger nearby wetlands.
They flourished in the nearby wetlands of Bear Swamp, causing annual outbreaks of the disease.
However, an additional half million gallons of sewage flowed into a nearby wetland.
There are environmental issues, like protection of nearby wetlands and assurances that the site has been properly cleaned up.
However, deposits of dissolved organic carbon may affect the clarity of the water due to the lake acting as a watershed to nearby wetlands.
The village gives its name to nearby wetland, Witherslack Mosses.
Over 50 commercially viable species of fish, belonging to 19 families have been identified, which supplies stock to other nearby wetlands and rivers.
Colonies last between one and seventeen years, their longevity related to size and quality of nearby wetlands.