. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 234 CALIFORNIA FISH AND GAME METHODS Vertical profiles for light, dissolved oxygen, temperature, and specific conductance were measured potcntiometricalK' at 12 stations during the period of 10-15 August 1971. Vertical light extinction coefficients uere calculated for each station as the slope of the best fitting line to a graph of In light intensity vs. depth (Hutchinson 1957), excluding measurements within 1 m ( ft) of surface or
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 234 CALIFORNIA FISH AND GAME METHODS Vertical profiles for light, dissolved oxygen, temperature, and specific conductance were measured potcntiometricalK' at 12 stations during the period of 10-15 August 1971. Vertical light extinction coefficients uere calculated for each station as the slope of the best fitting line to a graph of In light intensity vs. depth (Hutchinson 1957), excluding measurements within 1 m ( ft) of surface or bottom. During the summer of 1972, weekly measurements of light extinction were made at the 12 sample sites in the lake. Water from the 12 sites was also analyzed weekly for chlorphyll. Chlor- phyll a was determined by the trichromatic method (Strickland and Par- sons 1968) with the correction for degradation products. Water samples were filtered through glass fiber filters (Whatman GF/C) and the filters ground in a teflon tissue grinder to ensure complete extraction of chloro- phyll from the algal cells. Measurements of phytoplankton production were made at the 12 sta- tions within the lake during the period of 28 July to 17 August 1971. The oxygen light and dark bottle method was used with 24-hour in situ incuba- tion of six pairs of bottles at even intervals from top to bottom of the lake. During the summer 1972, weekly net plankton samples were taken at the 12 sites. Diagonal tows were made from bottom to surface using a number 10 net on a Clark-Bumpus plankton sampler. The sampler was pulled vertically at a constant rate from a slowly moving boat to get a uniformly integrated sample from all depths. a. Q. FIGURE 2. Distribution of temperature with depth and time in Eagle Lake's south Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not
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