Abstract
Abstract The effect of a dam upon the bottom-fauna production of Stevens Creek was tested for a 9-month period. The function of this dam being to catch flood waters and subsequently release them gradually, it has reduced the variations in water flow of the rainy season and has brought about a marked change in the physical appearance of the stream bed below the dam. Production of bottom organisms, both in number and weight, was much greater in the area below the dam than above. A sharp, spring peak of production occurred on March 1 in both of the sampling areas. The period of minimum production coincided with the periods of greatest fluctuations in flow and lowest water temperatures. The greatest extremes of flow and temperature took place above the dam. The population above the dam fell to a much lower point during the period of minimum production than did the population below the dam. Three types of aquatic insect larvae formed 81.3 percent of the total number of organisms taken. Caddicefly larvae contri...
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