25 



Figure 3-13. Size Frequency Histograms for Nereis virens : Beals Island 1992* 



DM 



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Length (mm) 



*DM = Constructed Intertidal Flat REF = Reference Site 



3.3 Infauna 



3.3.1 Sheep Island 



3.3.1.1 Assemblage Structure 



The structure of Sheep Island infaunal assemblages was compared by examining 

 taxa richness (a measure of diversity), total numerical abundance, total wet- weight 

 biomass, and biomass stmcmre (proportional composition by major taxonomic groups). 

 Taxa richness differed significantly (p<0.05) among sites over time (site by year 

 interaction factor) thus requiring linear contrasts to determine which sites were different 

 and when (Table 3-8). Significant linear contrasts (p<0.01) were detected in 1990 and 

 again in 1992. In 1990 taxa richness was higher at the constructed intertidal flat than the 

 reference area by more than 3 taxa/core, whereas in 1992 reference area taxa richness was 



Ecological Monitoring of a Constructed Intertidal Flat at Jonesport, Maine 



