The Quantitative Effects of a Dam upon the Bottom Fauna of a Small California Stream

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