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Ohio Journal of Science


Clarke (1973) states that Pisidium casertanum (Poli) is perhaps the most common species of Pisidium and is truly cosmopolitan, occurring throughout Eurasia, Africa, Australia, and South, Central and North America. Populations of these clams are reported in habitats ranging from ephemeral ponds to benthic zones of deep lakes. Our study describes Manuscript received 29 May 1979 and in revised form 25 July 1980 (#79-34). 2 Present address: Department of Biology, University of Virginia, Charlottesville, VA 22901. 3 Present address: Department of Zoology, Miami University, Oxford, OH 45056. 41 aspects of the life-cycle of P. casertanum in a spring-fed stream with a relatively small annual temperature range. Clams were collected monthly during the winter and bimonthly or weekly during the summer of 1974 and less regularly during 1975 from the west branch of Cedar Run at Cedar Bog, near Urbana, Ohio (USGS) map quadrangle Urbana West, Champaign County, Ohio: 40° 03.42'N 83°47.98'W). At certain times (see fig. 1) physical and chemical characteristics of the stream were recorded, including temperature and oxygen concentration (YSI Model 54 oxygen meter), conductivity (YSI Model 33 conductivity meter) and hardness (EDTA method, American Public Health Association 1976).

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Ohio Academy of Science