Abstract
An investigation of effects of sewage effluents on populations of microarthropods living in Spartina marshes was carried out in the spring and summer of 1970, using primarily a vacuum collecting technique. Comparisons of dominant forms, population densities, and species diversities were made between populations inhabiting marsh grass exposed to flooding by treated sewage wastes and those in nonpolluted areas. Only in the case of spiders and amphipods were significant differences found, with density in both cases being greater in the polluted marsh. Species diversity was relatively high, especially for populations from Spartina growing within margins of artificial ponds, some of which were also exposed to treated sewage wastes.
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