36 



Table 3-13. Similarity Percentage (SIMPER) Results for Sheep Island Constructed Flat vs 

 Reference Comparisons by Year* 



Year 



1990 



1991 



1992 



1994 



1998 



Average Dissimilarity 



60.42 



62.08 



72.41 



62.51 



53.34 



Taxa 













Oligochaeta 



27.76'* 



12.42*^ 















Tectidrilus gabriella 





13.38'' 



5.65 



14.18" 



11.99" 



Corophiuin volutator 



1.90 



12.77° 



18.58° 



12.96° 



7.75° 



Exogene hebes 



5.28 



12.13° 



3.82 



1.11 



2.87 



Phoxocephalus holbolli 



3.78 



7.99° 



2.28 









Polydora ligni 



7.06 



7.50« 



4.34 



7.16 



4.94 



Fabricia sabella 



15.80« 





6.36 



0.87 



4.98 



Pygospio elegans 



9.27° 



5.86 



0.51 







Clymenella torquata 



3.27 



6.68 











Corophium bonelli 







5.42 









Ampelisca vadorum 





5.28 



1.23 



1.27 





Nereis virens 



0.66 



5.27 



3.74 



4.08 



3.99 



Gammarus oceanicus 



7.95'* 



4.58 



7.61° 



5.35" 



4.94 



Capitella sp. 



6.75 



4.57 



8.43'' 



6.59° 



3.99 



Tubificoides benedini 







4.19 



16.04*' 



10.04" 



4.52 



Edotea montosa 





2.89 



3.95 





2.12 



Mya arenaria 





2.86 



2.09 



3.67 



2.98 



Polydora quadrilobata 



9.50° 



2.83 



2.01 



1.34 



5.38° 



Gammarus annulatus 



1.03 

















Scottolana canadensis 





2.47 



0.62 



0.69 



1.92 



Hydrobia sp. 









11.53° 





Streblospio benedicti 







6.54'' 



6.38 



11.18° 



Thalassomya sp. 







2.27 



1.39 



2.68 



Mytilus edulis 









0.78 



2.27 



2.21 



Littorina littorea 













4.63 





Jaera marina 







2.00 



0.74 



2.69 



Enchytraeidae 









1.16 



1.60 



4.48 



Eteone longa 













2.17 



3.16 



♦Values in bold are the five taxa contributing the most to dissimilarity for a comparison. Superscripts indicate where 

 abundances were highest (D= Constructed Flat; R = Reference); * indicates oligochaetes treated as single taxon for 

 test. 



Ecological Monitoring of a Constructed Intertidal Flat at Jonesport, Maine 



