Invasive corbicula in dudley pond

Invasive Asian Clams Corbicula fluminea in Dudley Pond, Wayland, MA A Report to Mike Lowery Wayland Surface Water Quality Committee By Watershed Planning Program Division of Watershed Management Massachusetts Department of Environmental Protection

Clams from Dudley Pond

Abundance Individuals/square foot Individuals/square meter

Site #1 144 1,548

Site #2 24 258

The abundance data show that the clam density is high but they are not evenly distributed in the lake

Size of Clams Site #1

Site #2

Mean Length (mm)

16.26

20.14

Standard Error (mm)

0.60

1.17

Maximum (mm)

23.11

24.10

Minimum (mm)

10.42

17.01

Clam 2-D Analysis Clam shell height (mm)

25 20 15 Site #1

10

Site #2

5 0 0

10 20 Clam shell length (mm)

30

Size Distribution of the Clam Population

Frequency

20

15 10 5

0

Clam shell length (mm) • This graph tells that there is a healthy and sustainable Corbicula population in Dudley Pond, Wayland

Appendix I: Clams Shells in the Lake

From Mike Lowery

Appendix II: Dudley Pond Bathymetric Map

From Mike Lowery