such as "Introduction", "Conclusion"..etc
Measurements of apparent photosynthesis (excess over respiration) were made on -plankton samples taken from westem Lake Erie at approximately biweekly intervals during 1949. Figure 2 shows the apparent photosynthesis of the phytoplankton from one liter of water graphed against the volumetric units per liter present in the lake. In most cases each datum point represents the average of six determinations, samples collected on the same day from three depths (0-, 5-, and 9-meters) at two stations three miles apart. The solid line represents the regression line, indicating a rate of 1.5 micromoles of CO2 absorbed per hour per 106 units of phytoplankton. The genera which contributed importantly to these data were Tabellaria, Melosira, Pediastrum, and Fragilaria. The test temperature, being near that of the lake, varied between 1-27° C during the year. The correlation is high (coefficient of .96) but the scatter between 0 and 1 on the abscissa is obscured by the excellent fit on the high values. A separate correlation computed for the scatter diagram between 0 and 1 yielded a coefficient of .92, and a regression line (broken) indicating a rate of 1.1 micromoles of CO2 absorbed per 106 units per hour. The broken line includes significant contributions from zooplankton respiration, which appears as reduced photosynthesis, but zooplankters were conspicuously scarce in the dense Tabel-laria community. It is noteworthy that the highest zooplankton populations present did not exhibit respiration rates which exceeded photosynthesis, but apparent photosynthesis consistently showed positive values. Respiration rates were determined on about two-thirds of the samples studied, making an estimate of the average total photosynthetic rate possible. The apparent rate in 87 tests amounted to 86% of total photosynthesis, so respiration, including that of the zooplankton, averaged only 14% of total photosynthesis. The respiration rate of the dense Tabellaria community, however, which contained negligible amounts of zooplankton, amounted to 12%fo of total photosynthesis. So the apparent rate of 1.5 micromoles CO2 absorbed per 106 units of phytoplankton per hour must represent a total rate of about 1.7.
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