by Molly Robertson
Darien is fortunate to have plenty of water in local streams, ponds, rivers, and, of course, the Long Island Sound. Every living thing needs water, and we have the convenience that with a turn of the tap or the push of a button, our dishes and clothing get washed, and we can shower, give our kids a bath, or have a drink. It is easy to take water for granted, and I had never thought much about water until I came to the nature center 12 years ago. Watching the degradation of the Cherry Lawn Park pond has given me a better understanding of how quickly human activity can affect wildlife and habitats.
The tadpoles, dragonfly nymphs, fish, and other aquatic life in the pond have been increasingly difficult to find. Large amounts of fertilizer used at nearby homes and in the park have caused an overgrowth of algae and duckweed, which rendered the pond hypoxic (no oxygen) this summer. Healthy ponds have an oxygen level of 10-12 mg/L. this past summer, it was 1mg/L, a dead zone, endangering every animal in the pond, including turtles, invertebrates, eels, and fish. The pond also needs dredging. Dredging the pond will remove the nutrients from fertilizer accumulating in the sediment. Pond succession, a natural process where a pond slowly fills in with sediment and land, is also occurring. Dredging will restore the pond's volume and depth, which will help eliminate unhealthy algae blooms and begin to heal the pond's ecosystem.
In addition to the chemical changes, the pond at Cherry Lawn Park has fishing lines, bobbers, and hooks hanging from the trees and in the water, threatening wildlife. Recently, a Nature Center class found a freshwater eel wrapped in a fishing line with a hook deep in its throat. We were able to cut him loose, but sadly, we could not free him from the hook he had swallowed. I don't know how eels feel pain, but as he swam away, I felt sad for his uncertain future. Water quality is vital to maintaining environmental balance in our community. As our lawns lay dormant for the winter, I hope we can plan some small or significant changes to help protect Darien's incredible water habitats.
Ways to reduce your impact on water
Cherry Lawn Pond in 2017 and 2024
203-655-7459
information@dariennaturecenter.org
120 Brookside Road
Darien, CT 06820
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