improvisus, Tubularia crocea and Mytilus edulis, and Alcyonidium spp. had consistently large primary covers, 

 while Laminaria saccharina and Botryllus schlosseri were totally absent from EF assemblages. 



Woodborer abundances vary from site to site and were dependent on the time of year the exposure 

 panels were exposed. Trends in primary cover did not appear to affect woodborer abundances. At ambient 

 water sites, Teredo navalis was the only shipworm collected. Woodboring Crustacea, Limnoria spp. and 

 Chelura terebrans, were most abundant at WP and GN. The EF site had the only population of T. bartschi 

 and this species appeared to recruit to panels only when effluent temperature exceeded 22 °C. Teredo 

 navalis colonized panels at EF later in the year than at ambient water sites. 



Patterns of abundance and distribution of woodborers and other fouling organisms at the ambient 

 water sites were consistent and predictable from year to year, as were differences between the ambient 

 water communities and those that developed in undiluted effluent. Characteristics of the EF community 

 included enhanced primary cover, temporal shifts in peak abundance of individual species and total primary 

 cover, absence of cold water species, and the unique occurrence of a warm water shipworm, Teredo 

 bartschi. Further investigations of the factors that control the distribution of T. bartschi are detailed in 

 the next section. 



DISTRIBUTION STUDY OF TEREDO NA VALIS AND TEREDO 



BARTSCHI 



MATERIALS AND METHODS 



This study used panels located at 100, 500, and 1000 m from the cuts in the Millstone Quarry through 

 which the MNPS effluent flows into Long Island Sound (Fig. 1). In May of each year a total of 15 

 knot-free pine exposure panels without plexiglass backers were placed in three wire lobster pots attached 

 to each of three trawl-lines (Fig. 10). In November, nine panels from each trawl-line were collected, 

 leaving six panels to provide substratum for a stock population. Three panels were taken from each 

 lobster pot in a trawl-line and three new ones were added. In May of the following year all 15 panels 

 were collected and replaced with new ones. To date, only two exposure periods have been completed. 



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