1567 



Romeril, M. G. 1974. 



Trace metals in sediments and bivalve mollusca in Southampton Water and the 

 Solent. Rev. Internatl. d 'Oceanographie Medicale 33: 31-47. 



Significant variations occurred in tissue content of Zn, Cu, and Fe with 

 locality, season, and age in Meraenaria mercenaries and C erastoderma edule. 

 In general, metal content was correlated with metal content of sediments. 

 Results emphasized the need for extensive and comprehensive background data 

 to assess accurately the significance of observed fluctuations. - J.L.M. 



1568 



Romeril, M. G. 1979. 



The occurrence of copper, iron and zinc in the hard shell clam, Meraenaria 

 meraenaria, and sediments of Southampton Water. Estuarine Coastal 

 Mar. Sci. 9(4) : 423-434. 



Concentrations of Cu, Fe, and Zn were measured in M. meraenaria from several 

 locations along Southampton Water to provide background data for accurate 

 assessment of the significance of observed fluctuations. Studies showed 

 considerable seasonal, age, and geographical fluctuations in tissue metal 

 concentration. All metal concentrations in clam tissue were lower at the 

 seaward end of the estuary, but although sediment metal levels generally 

 followed a similar trend, tissue and sediment values appeared to correlate 

 with each other only for Fe. Trace metal accumulation by clams is obviously 

 affected by many factors. A change" in concentration with age was the most 

 easily recognized relationship. Seasonal trends are evident, but they lack 

 satisfactory explanation. There is little evidence of any significant 

 effect on metal uptake which could be attributable to operation of the 

 Marchwood Power Station. - J.L.M. 



1569 



Roop, Tom, and Michael J. Greenberg. 1967. 



Acetylcholinesterase activity in Crassostrea virginiaa and Meraenaria 

 meraenaria. Am. Zool. 7(4): 737-738 (abstract 112). 



Isolated venerid hearts are about 10,000 times "more sensitive" to 

 acetylcholine (ACh) depression than are ostreid hearts. But eserine 

 augmentation of ACh effect in venerids is about 30-fold "smaller" than 

 potentiation in ostreids. In Crassostrea virginiaa, rhythmical activity of 

 gills is increased by ACh. The threshold drops in presence of eserine. 

 Eserine alone augments rhythmical activity. Action of ACh on Meraenaria 

 meraenaria gills is scarcely affected by eserine. Cholinesterase activity 

 recovered from oyster heart and gill was at least 100 times "greater" than 

 that of Meraenaria organs under the same analytical conditions. Ganglia of 

 the 2 species had a similar high activity. Differences in cholinergic 

 pharmacology of oysters and clams are attributable to comparatively high 

 cholinesterase activity of oyster tissues. - J.L.M. 



1570 



Ropes, John W. 196 3. 



The incidence of Malaaobdella grossa in hard clams from Nantucket Sound, 

 Massachusetts. Limnol. Oceanogr. 8(3): 353-355. 



The commensal nemertean M. grossa is widely distributed along the Atlantic 

 coast of the U.S., in Meraenaria meraenaria, M. campechiensis , and Mya 

 arenaria. Incidence of worms varied from 5.3% to 23.5% in .samples of clams 

 from different localities. Water currents and velocities may be responsible 

 for this variation. No clam contained more than one nemertean. - J.L.M. 



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