J6 



3.2 Soft-clam and Bait-worm Survey Results 



3.2.1 Sheep Island 



3.2.1.1 Soft-Clams (Mya arenaria) 



Initial rake and pit sample soft-clam abundances (animals/m^) were approximately 

 the same at both sampling sites, however, after 1991 densities were 2-3 times higher at the 

 constructed flat than the reference site (Table 3-1). Abundances from core samples, a 

 measure primarily of small-sized animals, indicated no differences between sites (p>0.05) 

 for either species (Table 3-2). The only significant differences (p<0.05) detected were 

 between sampling dates; Mya arenaria abundances were highest in 1994 (Figure 3-5). 



Table 3-1. Sheep Island Soft-Clam (Mya arenaria ) Survey Results* 



Year DM n REF n 



1990 



15.0 



13 



14.2 



19 



1991 



26.7 



75 



9.2 



38 



1992 



26.6 



228 



10.2 



92 



1998 



3.3 



13 











Table 3-2. ANOVA Results for Sheep Island Mya arenaria Abundance (Cores) 



Effect Test 



Source 



DF 



Sum Sq. 



F Ratio 



P 



Site 



1 



0.0106 



0.0525 



0.8190 



Year 



1 



2.2516 



2.7976 



0.0272 



Site*Year 



4 



1.1691 



1.4526 



0.2181 



Error 



200 



40.2413 



0.2012 





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



Ecological Monitoring of a Constructed Intertidal Flat at Jone sport, Maine 



