23 



Figure 3-11. Size Frequency Histograms for Mya arenaria : Beals Island 1992* 



DM 



Length (mm) 

 3.2.2.2 Clam-worms (Nereis virens) 



Clam-worms were far more abundant in rake and pit samples at the Beals Island 

 constructed flat than the reference area in both 1991 and 1992 (Table 3-6). The same is 

 true for three of the four years where linear contrasts detected significant differences 

 (p<0.01) between the constructed flat and reference area (Table 3-7; Figure 3-12). 

 Differences were detected between sites for all years except 1990 and reference values 

 were higher than constructed flat abundances only in 1993. Size frequency analysis was 

 possible only for the 1992 constructed flat samples; the population was bimodal with peaks 

 in the 110-199 and 200-209 mm categories (Figure 3-13). 



Table 3-6. Beals Island Clam- worm (Nereis virens ) Survey Results* 



Year 



DM 



n 



REF 



n 



1991 



26.7 



20 



0.4 



4 



1992 



8.9 



90 



0.4 



3 



* Abundances in No. animals/m^; n = total numbers collected 



Ecological Monitoring of a Constructed Intertidal Flat at Jonesport, Maine 



