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Creator:: Steinman, Alan D.
Abstract:: Effects of current velocity, irradiance, and grazing on the biomass, taxonomic structure, physiognomy, and chemical composition of lotic algal assemblages were investigated. Four experiments, lasting 32 to 75 days, were conducted in laboratory streams to determine how these factors affect algal assemblages singly, and in concert with each other. Regardless...
Resource Type:: Dissertation
Full Text:: low (50 and 15 pEm -2s-1 ) irradiances were characterized by higher biomass, a greater amount of

Creator:: Lundberg, Chris H.
Resource Type:: Masters Thesis
Full Text:: structure of periphyton were investigated in two experiments, one in laboratory streams and the other in a

Creator:: DeNicola, Dean M.
Resource Type:: Dissertation
Full Text:: top and recessed surfaces were significantly affected by irradiance level. Irradiance had a

Creator:: Sumner, William T.
Resource Type:: Masters Thesis
Full Text:: six laboratory streams over a period of 80 days. Oxytrema silicula, an herbi- vorous snail common to

Creator:: Busch, David E.
Abstract:: Experimental streams constructed by the Weyerhaeuser Company, Tacoma, Washington, at Kalama Springs, Washington, were used to observe successional changes in the benthos. Community changes were observed relative to experimental manipulations of light intensity and nitrate concentration in two experiments. The development of benthic assemblages was followed for 150 days after...
Resource Type:: Masters Thesis
Full Text:: were counted at 100 X. Fila- ment lengths were approximated by a grid method (Olson, 1950) using a

Creator:: Rose, Frederick Louis
Abstract:: The accumulation of dieldrin and its effects on species composition of benthic algal communities were studied in laboratory streams. Effects of dieldrin on photosynthetic and respiratory rates of the blue-green alga Phormidium retzii were determined using a Gilson Differential Respirometer. Dieldrin concentrations ranging from 0.05 to 7.0 ppb were maintained...
Resource Type:: Dissertation
Full Text:: Phormidium retzii were determined us- ing a Gilson Differential Respirometer. Dieldrin concentrations

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