The Photosynthetic Activities of the Aquatic Plants of Little John Lake, Vilas County, Wisconsin
1. The photosynthetic activities of the phytoplankton of Little John Lake were studied by means of dropping mercury electrodes and by bottle samples anchored in the lake at different depths and for different periods of time. 2. The mean chlorophyll content of the water fell between 7.5 and 19.4 mg/m...
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| Published in: | The American midland naturalist Vol. 30; no. 2; pp. 426 - 446 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
University of Notre Dame
01-09-1943
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | 1. The photosynthetic activities of the phytoplankton of Little John Lake were studied by means of dropping mercury electrodes and by bottle samples anchored in the lake at different depths and for different periods of time. 2. The mean chlorophyll content of the water fell between 7.5 and 19.4 mg/m3. The chlorophyll constituted from 0.39 per cent to 1.06 per cent of the dry organic matter in the centrifuge plankton. In four out of six series of samples, the quantity of chlorophyll was closely correlated with the number of phytoplankters. 3. The oxygen production of the phytoplankton varied from a minimum of 12.5 kg/ha/da to a maximum of 66 kg/ha/da, with glucose equivalents of 8 and 35 kg/ha/da, respectively. Total oxygen production from May to September, inclusive, is estimated at 3274 kg/ha, equivalent to 1745 kg/ha of glucose; this was 32 times the average standing crop of centrifuge plankton in August. A significant correlation was found between chlorophyll content of the water and the hourly rate of oxygen production. 4. The quantity of oxygen consumed ranged from a minimum of 8 kg/ha/da to a maximum of 33 kg/ha/da; the oxygen consumption varied from 48 per cent to 71 per cent of the oxygen produced on clear and partly cloudy days, but on a cloudy day the oxygen produced was only 42 per cent of that consumed. 5. As a result of the photosynthetic activities of the phytoplankton, the water of the 0-3 m. stratum became supersaturated with oxygen in late July and early August; the maximum excess was 67 per cent above the amount required for saturation which was found at 3 m. on August 5. |
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| ISSN: | 0003-0031 1938-4238 |
| DOI: | 10.2307/2421289 |