In both experiments, observed pH values in enclosures, based
on discrete (Table 2) and continuous (Table 3) measures, were
consistent with targeted pH treatment levels
During the prebloom
experiment, P. parvum cell density exceeded the bloom
threshold in the untreated control enclosures (pH 8.5), but only on
day 21 (Fig. 1A).
In fact, P. parvum growth was significantly
(p < 0.05) inhibited by both pH treatment levels such that cell
densities did not exceed bloom thresholds (Fig. 1A)
In the bloom
development experiment, P. parvum cell growth also exceeded the
bloom threshold concentration (Fig. 1B) as early as study day 7
with P. parvum cell density continuing to increase throughout the
21 d study period (Fig. 1B)
Similar to the pre-bloom experiment, P.
parvum growth was also significantly (p < 0.05) inhibited at the pH
7 and pH 7.5 treatment levels such that population densities never
reached the bloom threshold (Fig. 1B).
In both experiments, observed pH values in enclosures, basedon discrete (Table 2) and continuous (Table 3) measures, wereconsistent with targeted pH treatment levelsDuring the prebloomexperiment, P. parvum cell density exceeded the bloomthreshold in the untreated control enclosures (pH 8.5), but only onday 21 (Fig. 1A).In fact, P. parvum growth was significantly(p < 0.05) inhibited by both pH treatment levels such that celldensities did not exceed bloom thresholds (Fig. 1A)In the bloomdevelopment experiment, P. parvum cell growth also exceeded thebloom threshold concentration (Fig. 1B) as early as study day 7with P. parvum cell density continuing to increase throughout the21 d study period (Fig. 1B)Similar to the pre-bloom experiment, P.parvum growth was also significantly (p < 0.05) inhibited at the pH7 and pH 7.5 treatment levels such that population densities neverreached the bloom threshold (Fig. 1B).
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