Norwich Pond, Lyme - 2015


Transect Data | Water Data

Norwich Pond is a 29-acre waterbody located in Lyme, CT. There is a public boat ramp at the southwestern end for "carry-in" boats only. There are a few private residences on the eastern shoreline, and the Beckett Hill State Park Reserve boarders the western shore.

The 2015 CAES IAPP survey of Norwich Pond was a resurvey from 2004. The 2015 survey found 18 aquatic plant species compared to 10 species in 2004. No invasive species were found in 2004 or 2015. White water lily (Nymphaea odorata) was the most dominant plant found in both surveys. Robbins' pondweed 
(Potamogeton robbinsii), was one of the dominant species found in 2004. In 2015 it was less dominant and was frequently found in small patches intermingled with other species.

Little floating heart (Nymphoides cordata) increased in abundance, from one small patch in 2004 to several patches around the shoreline of the lake in 2015. Similarly, spotted pondweed (Potamogeton pulcher) spread from one small patch in 2004 to several small patches .

All three bladderwort species, floating bladderwort (Utricularia radiata), flat-leaf bladderwort (Utricularia intermedia), and purple bladderwort (Utricularia purpurea), found in 2004 expanded from a few small patches to multiple patches in 2015. We also found two new bladderwort species in our 2015 survey: humped bladderwort (Utricularia gibba) and common bladderwort (Utricularia macrorhiza). These plants are common throughout the pond.

While the number of aquatic plant species increased from 2004 to 2015 the coverage of aquatic plants has stayed very similar. This can be attributed to the deep nature of the pond creating a small littoral zone (0-12 feet deep) where plant growth is supported.

Species recorded in our 2015 aquatic plant survey of Norwich Pond.
Scientific Names
Bur-Reed Pickerelweed Sevenangle pipewort
Common bladderwort Primrose-Willow Spikerush
Flat-Leaf bladderwort Purple bladderwort Spotted pondweed
Floating bladderwort Quillwort Watershield
Humped bladderwort Robbins' pondweed White water lily
Little floating heart Rush Yellow water lily

Other Norwich Pond Surveys: 2019, 2004