1398 



Newcombe, Curtis L. 19 35. 



Certain environmental factors of a sand beach in the St. Andrews region, 

 New Brunswick, with a preliminary designation of the intertidal communities. 

 J. Ecology 23: 334-355. 



The major infaunal community in the area was dominated by Mya arenaria and 

 Nereis virens , with Cerebratulus marginatus as a subdominant, Maeoma baltiaa 

 as an influent, and Lineus ruber and a small unidentified annelid as 

 subinf luents. The author comments that this biome extends widely in the Gulf 

 of Maine, as an intertidal community of greatest economic value to the 

 fisheries of the region. South of Cape Cod, he says, different associations 

 exist, and the influence of Venus meraenaria becomes dominant south of 

 New York State. - J.L.M. 



1399 



Newcombe, Curtis L. , Sarah J. Thompson, and Herman Kessler. 1938. 



Variations in growth indices of Venus meraenaria L. from widely separated 

 environments of the Atlantic coast. Cdn. J. Research, D.16: 1-5. 



Variations in linear indices of length, width, and thickness, and differences 

 in shell weights of V. meraenaria from Gulf of St. Lawrence, Chesapeake Bay, 

 and North Carolina were studied. Living clams were dried to constant weight, 

 and shells weighed after removal of body parts. Constants of the equations 

 W=a+bL and T=d+eL were determined, where W=width (greatest radius with umbo 

 as center) , T=thickness (greatest distance across valves) , and L=length 

 (greatest anterior-posterior dimension) . Within the length range studied the 

 relation between logL and logW was a straight line, so that Wt=cL^, where c 

 is a constant denoting the value of Wt when L=l (the fractional coefficient) , 

 and k is the ratio of relative growth rate of shell weight to relative growth 

 rate of length. Relative growth rate means rate of growth per unit dimension. 

 Results were as follows: 



Dimensional 

 ratios 



Con 



stants 



Gulf of St. 

 Lawrence 



0.931 

 -2.876 



Chesapeake 

 Bay 



North 

 Carolina 



L to W 





b 

 a 



0.772 

 2.274 



0.852 

 1.395 



L to T 





e 

 d 



0.560 

 0.378 



0.583 

 -0.634 



0.570 

 -0.631 



L to Wt 





k 

 c 



3.003 

 0.00000214 



3.032 

 0.00000171 



3.151 

 0.00000108 



The "b" values for linear dimensions showed the greatest differences between 

 regions, whereas differences in actual widths and thicknesses at corresponding 

 lengths were not considered significant. Shells from Gulf of St. Lawrence 

 were heavier than those from warmer waters- of Chesapeake Bay and N.C. The 

 only obvious environmental relationship appeared to be an inverse relationship 

 between shell weight and water temp. - J.L.M. 



1400 



Newell, B. S. 1953. 



Cellulolytic activity in the lamellibranch crystalline style. J. Mar. 

 Biol. Assn. U.K. 32(2): 491-495. 



Crystalline styles of Ostrea edulis and Mytilus edulis appeared to contain 

 a cellulolytic factor as yet unidentified. Venus (Meraenaria) meraenaria 

 is not mentioned. - J.L.M. 



393 



