. Acute and chronic toxicity to zooplankton of pure pentachlorophenol and a technical formulation : laboratory and field studies. Aquatic animals; Pentachlorophenol; Pentachlorophenol. 10 20 30 TIME CCAYS^ '° 1 uocrozooplanlcLon PCP at mg/L was not acutely toxic to the macrozooplankton and the mean numerical densities in the treated enclosures did not differ significantly from those in the control corrals (Figure 7). However, there appeared to be a decline in densities of the microzooplankton immediately posttreatment followed by recovery to levels similar to those in the control corrals w
. Acute and chronic toxicity to zooplankton of pure pentachlorophenol and a technical formulation : laboratory and field studies. Aquatic animals; Pentachlorophenol; Pentachlorophenol. 10 20 30 TIME CCAYS^ '° 1 uocrozooplanlcLon PCP at mg/L was not acutely toxic to the macrozooplankton and the mean numerical densities in the treated enclosures did not differ significantly from those in the control corrals (Figure 7). However, there appeared to be a decline in densities of the microzooplankton immediately posttreatment followed by recovery to levels similar to those in the control corrals within 15 d (Figure 7). This observed difference was not statistically ... , ,-» T, r\ nr\ • ^\. \.- ^. Figure 7. Changes in mean densities (±SE) of significant (t-teSt, n=12, P>) given the high zooplankton in control and PCP-treated enclosures for Experiment 1, 4- application of degree of variation associated with the pcp. population estimates. The average coefficient of variation () associated with the rotifer density estimates throughout Experiment 1 was 57 and 80 % (n=18) for the control and PCP-treated corrals, respectively. Similar trends were | observed for the three major groups that comprised the macrozooplankton. The relative percent abundances of the four major groups of zooplankton in control and PCP-treated corrals reflected the nature of the dissimilarity among replicates and may explain some of the observed variability in density estimates (Figure 8). Figure 8. Relative percent abundances of the four major Control corrals 2 and 12 had communities 8^°"?* of zooplankton in replicate control and PCP- treated corrals during Experiment 1. ^ -r^. 34. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stephenson, Gladys L. (Gladys Lorraine), 1954-; Kaushik, N. K; Ontario. Ministry o
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