Ecological monitoring of a constructed intertidal flat at Jonesport, Me. ecologicalmonito00rayg Year: 1999 29 The proportion of biomass contributed by major taxonomic groups (, oligochaetes, polychaetes, etc.) differed both among sites and over time (Figure 3-17). In 1991 and 1992, molluscs provided approximately 50 of total biomass at the constructed intertidal flat while polychaetes and crustaceans, respectively, made lesser contributions. By 1994 molluscs accounted for 90 of all biomass at the constructed flat, however, this value fell to 29 in 1998 when crustacean biomass increased f
Ecological monitoring of a constructed intertidal flat at Jonesport, Me. ecologicalmonito00rayg Year: 1999 29 The proportion of biomass contributed by major taxonomic groups (, oligochaetes, polychaetes, etc.) differed both among sites and over time (Figure 3-17). In 1991 and 1992, molluscs provided approximately 50 of total biomass at the constructed intertidal flat while polychaetes and crustaceans, respectively, made lesser contributions. By 1994 molluscs accounted for 90 of all biomass at the constructed flat, however, this value fell to 29 in 1998 when crustacean biomass increased from 15 to 40 of total biomass. At the reference area, polychaetes were the overwhelming dominant in 1991 (68), but were replaced by molluscs (53-93) in subsequent samples. As at the constructed flat, the highest proportion of mollusc biomass was found in 1994. Figure 3-17. Sheep Island Infaunal Biomass Structure. 100 Misc /y\ Mollusc Crustacea ^H Oligochaaa ^H Pol3rdhBieta 1991 1992 1994 1998 Constructed Flat (DM) 1991 1992 1994 1998 Reference (REF) Together, the assemblage structure parameters indicate that a diverse and abundant infaunal assemblage was quickly established at the constructed intertidal flat. The absence of site or site by year differences in biomass values also suggests that the assemblage developed rapidly, achieving and maintaining levels comparable to the reference area. The overall dominance of biomass by molluscs and the tendency for periods of particularly high dominance to be identical at both sites (, 1994) also indicates a high degree of similarity between sites. Ecological Monitoring of a Constructed Intertidal Flat at Jonesport, Maine
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