The ecology of algae The ecology of algae : a symposium held at the Pymatuning Laboratory of Field Biology on June 18 and 19, 1959 ecologyofalgaesy00tryo Year: 1960 -TEMPERATURE Modified from Gameson and Griffith, 1959 I I I 20 24 4 8 12 16 TIME - DAY SIX MONTH AVERAGE DIURNAL CURVES rOR RIVER H\l, ENGLAND Figure U centimeters. Here, however, with a much lower phytoplankton population, the oxygen production rate never exceeded 1 gram per square meter per hour for the period studied . The quantity of oxygen produced by photo- plankton can be both impressive and important. In raw sewage stabil
The ecology of algae The ecology of algae : a symposium held at the Pymatuning Laboratory of Field Biology on June 18 and 19, 1959 ecologyofalgaesy00tryo Year: 1960 -TEMPERATURE Modified from Gameson and Griffith, 1959 I I I 20 24 4 8 12 16 TIME - DAY SIX MONTH AVERAGE DIURNAL CURVES rOR RIVER H\l, ENGLAND Figure U centimeters. Here, however, with a much lower phytoplankton population, the oxygen production rate never exceeded 1 gram per square meter per hour for the period studied . The quantity of oxygen produced by photo- plankton can be both impressive and important. In raw sewage stabilization ponds in the northern part of the country, production of as much as 26 grams per square meter per day by a biological system using 19 grams per square meter per day for total respiration (a P/R of 1 .4) assures a favorable oxy- gen balance during illuminated periods. It also provides a surplus that can be mixed by wind and convection currents into deeper, less illuminated strata so that they also can participate in aerobic stabilization. Some dissolved oxygen persists in- to the night, but usually it is completely used be- fore the next period of illumination. Although the quantities of oxygen in question may seem small, the customary daily addition to these ponds of oxygen-demanding material in the form of sewage is only about 1-1/4 grams per square meter. Even in rivers, unless their pollution load is unusually heavy, an oxygen production rate of 7 .4 grams per square meter per day and respiratory rate of 5 grams per square meter per day (P/R of 1 .5) , as found in the Ohio River, leave a surplus sufficient for the usual total demand. Both in sewage stabilization ponds and in streams, surplus oxygen produced by phytoplankton is not efficiently used and may be unavailable for oxidizing organic matter within a short time bfter it is produced. During periods of intense oxygen pro- duction the water becomes supersaturated and oxy- gen escapes to the atmosphere. Surface ag
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