. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PHYTOPLANKTON DAILY RHYTHMS 203 kt (slope) and Umax (intercept). Standard errors were calculated for photo- synthetic capacity which was measured in duplicate (experiment 1) or triplicate (experiment 2). The native concentration of phosphate, normally at the lower limit of detection in Lake George, was not measured. It was assumed to be 10 per cent of total phosphorus in suspension which, in August, was approximately up P/ liter (Clesceri, personal communication). The 10 per cent estimate is consistent with the estimated
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PHYTOPLANKTON DAILY RHYTHMS 203 kt (slope) and Umax (intercept). Standard errors were calculated for photo- synthetic capacity which was measured in duplicate (experiment 1) or triplicate (experiment 2). The native concentration of phosphate, normally at the lower limit of detection in Lake George, was not measured. It was assumed to be 10 per cent of total phosphorus in suspension which, in August, was approximately up P/ liter (Clesceri, personal communication). The 10 per cent estimate is consistent with the estimated fraction of reactive phosphorus for many lakes (Hutchinson, 1957).. START DAY — • 0330 0 (f) D 0900 0 X 2130 0 -^ 6 O 0230 1 -*^ v^ O A 0800 1 m _ rr ^ n till 1 // 01/41/23/41 2 ADDED PHOSPHATE ( No H2P04) ^M / liter FIGURE 2. Rates of carbon assimilation in response to the addition of sodium phosphate to water samples from Lake George, New York. Shown are the results of five of seven sets of samples measured during one 30-hour interval in October 1970. Incubation was at lake temperature (16°) and at 1500 ft-c. RESULTS The addition of phosphate to samples of water from Lake George often but not always resulted in stimulation of carbon assimilation. In one experiment rates of carbon assimilation in five of seven sets of enrichments are shown in Figure 2. Although only a part of the total pattern can be observed, that which is the result of added phosphate is strongly suggestive of an hyperbola. Despite the general conformation, intermediate concentrations of enrichment sometimes produced slight but significant depressions in expected pattern. These so-called stalls were evident in at least two of the seven sets that comprised each experiment. While not con- founding, they remind the investigator that the response of many distinct species populations is measured together. The photosynthetic capacity, , Pmax (photosynthetic rate at light saturation), of the phytoplankton
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
