. Algae of the western Great Lakes area. Algae -- Lake States; Algae. •Fish • Zooplankton •Bottom fauna •Bottom flora Phytoplankton Dissolved organic matter Figure 3. Relative weights of various components of the biota and dissolved organic matter in Weber Lake, Wisconsin, a soft water seepage type. Scale: sq. mm. = 1 kilogram per hectare. (From Juday, 1943) than hard water, eutrophic habitats. In their studies Henrici and McCoy () show that the bacterial flora of the bottom is larger in numbers of individuals than that of open water and that, as might be expected, the difference betwe
. Algae of the western Great Lakes area. Algae -- Lake States; Algae. •Fish • Zooplankton •Bottom fauna •Bottom flora Phytoplankton Dissolved organic matter Figure 3. Relative weights of various components of the biota and dissolved organic matter in Weber Lake, Wisconsin, a soft water seepage type. Scale: sq. mm. = 1 kilogram per hectare. (From Juday, 1943) than hard water, eutrophic habitats. In their studies Henrici and McCoy () show that the bacterial flora of the bottom is larger in numbers of individuals than that of open water and that, as might be expected, the difference between the bottom and upper level flora is greater in eutrophic than in oligotrophic lakes. In ohgotrophic Crystal Lake, Vilas County, Wisconsin, for ex- ample, the bacteria count per cc. of bottom mud sampled was 2,160; whereas in Alexander, a eutrophic lake in Minnesota, the count was 144,240 per cc. of bottom "; In the former lake the total bacterial flora of the bottom (average bacteria per cc. x depth of the mud) was 38,880 as compared with 2,599,320 in Alexander Lake. In the examination of the open water of the two lakes, an inter- esting bacterial count was secured. In Crystal Lake the average was 80 organisms per cc; in Alexander, 675 per cc. When the ratio of the number of bottom bacteria to open water bacteria in the two lakes is compared, an even greater difference is noted. In Crystal Lake the total open water flora (average bacteria per cc. x depth of the lake) is 159,900, which, when compared with 38,880 on the bottom, gives a quotient of A much higher ratio is found in the eutrophic type of lake. In Alexander there was a total of 538,300 organisms in the [24]. 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 perfectly resemble the original Prescott, G. W. (Gerald Webber), 1899-. Dubuque, Iowa, W.
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