Statistically significant among-genotype differences in specific activities 

 were observed for aminopeptidase-I ("Lap") enzyme in Mytilus edulis and 

 Mevcenavia mevcenavia from oceanic salinity environments on Long Island. 

 In Long Island Sound, where salinity is reduced, overall enzyme activity was 

 reduced and the specific enzyme activities of genotypes did not differ within 

 species. The parallel variation of enzyme activity among genotypes in dif- 

 ferent species suggests that similar phenotypic diversity has been maintained 

 during the evolutionary divergence of the Lap gene. - J.L.M. 



215S 



Korringa, P. 1971. 



Marine pollution and its biological consequences. In Fertility of the Sea. 

 Vol. 1. John D. Costlow, Jr. (ed,) . Gordon and Breach Science Publishers, 

 New York: 215-223. 



Mercenaria mercenaria , the American hard-shelled clam, thrives now in the 

 Southampton region, because its reproduction has been made possible by 

 higher water temps. Hot water discharged by power plants is one of the few 

 waste products which may, although not always, have a positive effect in the 

 sea. For reasons of economy discharge close inshore is preferred, but for 

 fisheries and recreation discharge well offshore, if possible beyond the 

 edge of the continental shelf is highly desirable. - J.L.M. 



2159 



Kraeuter, John N., and Michael Castagna. 1980. 



Effects of large predators on the field culture of the hard clam, Mercenavia 

 mevcenavia. U.S. Dept. Commerce, Fish. Bull. 78(2): 538-541. 



July 1977 results mirrored those of earlier sampling periods. The data show 

 that trapping is essential in penned areas, but that when pens are absent 

 trapping is of no benefit. Effect of large predators can be seen by compar- 

 ing survival inside and outside the penned sites. Average survival for both 

 penned sites was 9 4% from July to October-November. Average survival for 

 the same period in the unpenned sites was 8.75%. Clams of all sizes were 

 consumed. Only two species were common in the planted areas, Dasyatis 

 centvouva and Rkinoptera bonasus , and it was believed that the most likely 

 was a school of Rhinoptera bonasus . Such losses would be unpredictable, but 

 would be financially devastating to the clam grower. Use of a fence is 

 essential in areas where these large predators occur. In Va. they should be 

 kept in place from late March to early November. - J.L.M. 



2160 



Krause, S., and L. B. Cooley. 1978. 



Titration of paramyosin at low and at high ionic strength. Biophys. J. 21 

 (3), Muscle proteins IV: 140a (abstract TU-P0S-F4). 



Titration data were obtained at low ionic strength (0.001 M KC1) and at high 

 ionic strength (0.3 M KC1) on paramyosin extracted from Mevcenavia mercenaria 

 by several different methods. The low ionic strength titration curves of the 

 different paramyosin preparations were similar to each other but indicated 

 the slight difference between the number of groups titrating in the pH 3.2 

 to 3.3 region for the different preparations predicted earlier. High ionic 

 strength titration curves of the paramyosin preparations were quite different 

 depending on whether the titration was performed with base (pH 2 to 11) or 

 with acid (pH 12 to 3.5) . In titrations with acid, for example, over 70 

 groups were titrated abruptly near pH 8.5; this did not occur in titrations 

 with base. The various titration data are probably connected with phosphate 

 groups attached to native paramyosin which are removed slowly from the 

 macromolecule at high pH. - modified authors' abstract - J.L.M. 



2161 



Krause, Sonja,and Donald E. DeLaney. 1977. 



A study of paramyosin aggregation using transient electric birefringence 

 techniques. Biopolymers 16(6): 1167-1181. 



601 



