809 



Hedgepeth, Marvin. 1974. 



The effects of salinity shocks and low oxygen levels on ATPase activity in 

 two estuarine bivalves. M. A. Thesis, College of William and Mary. 



ATPase activity in the gill of Mercenaries meraenaria transferred from ambient 

 salinity to higher and lower salinities was monitored for 72 hrs . Increases 

 in gill ATPase activity were recorded for bivalves transferred to higher 

 salinities while corresponding decreases occurred when they were transferred 

 to lower salinities. Oxygen depletion caused lowered ATPase activity. Fluc- 

 tuations in ATPase activities were detectable within 6 hrs after transfer. 

 Results indicate that gills are a major site of ionic or osmotic regulation. 



- M.C. (Confirmed by examination of original thesis.) - J.L.M. 



810 



Hedgepeth, M. E.,and M. P. Lynch. 1974. 



Salinity related changes in ATPase levels in the Virginia oyster, Crassos- 

 trea virginiaa, and the hard clam, Meraenaria meraenaria. Proc . Va. J. 

 Sci. 25(2): 64 (abstract). 



Animals were transferred from ambient salinity to higher and lower salinities, 

 and compared with controls kept at ambient salinity. Significant increases 

 in gill ATPase activity were recorded for animals transferred to higher than 

 ambient salinities, and significant decreases in ATPase levels when trans- 

 ferred to lower than ambient salinities. Fluctuations in ATPase levels were 

 detectable within 6 hrs after transfer. Under similar environmental condi- 

 tions, ATPase levels in oyster and "hard clam are approximately equal. Re- 

 sults could indicate that the gills are a major site of ionic regulation. 



- J.L.M. 



811 



Hedgpeth, Joel W. 1950. 



Notes on the marine invertebrate fauna of salt flat areas in Aransas 

 National Wildlife Refuge, Texas. Inst. Mar. Sci., Univ. Tex. 1(2): 

 103-119. 



812 



Hedgpeth, Joel W. 1953. 



An introduction to the zoogeography of the northwestern Gulf of Mexico with 

 reference to the invertebrate fauna. Pub. Inst. Mar. Sci., Univ. Tex. 

 3(1) : 107-224. 



No original data on Venus or Meraenaria. - J.L.M. 



813 



Hedgpeth, Joel W. 1954. 



Bottom communities of the Gulf of Mexico. In Gulf of Mexico, its origin, 

 waters and marine life. Paul S. Galtsoff (coordinator). U.S. Fish Wildl. 

 Serv. , Fish. Bull. 55(89): 203-214. 



Although clam beds had been reported in various places , the only study that 

 had been made to date was in the Chandeleur Islands area, which showed 5 

 distinct concentrations of Venus meraenaria. - J.L.M. 



814 



Hedgpeth, Joel W. (ed.) . 1957. 



Treatise on Marine Ecology and Paleoecology . Geol. Soc. Am., Mem. 67, Vol. 1, 

 Ecology, viii+1296 p. 



Contains references to Meraenaria (Venus) meraenaria but no original data. 

 General applications to hard clam should be sought in chapters on salinity, 

 temp, carbonates and carbon dioxide, and Mollusca. - J.L.M. 



225 



