. Acute and chronic toxicity to zooplankton of pure pentachlorophenol and a technical formulation : laboratory and field studies. Aquatic animals; Pentachlorophenol; Pentachlorophenol. The variability associated with the density estimates of zooplankton in this experiment was less than- that in Experiment 1, with mean coefficients of variation of 23 and 45 % (n=36) for controls and PCP-treated enclosures, respectively. The relative percent abundances of the four major groups of zooplankton reflected a greater similarity in community structure among the three control corrals (Figure 11). The th
. Acute and chronic toxicity to zooplankton of pure pentachlorophenol and a technical formulation : laboratory and field studies. Aquatic animals; Pentachlorophenol; Pentachlorophenol. The variability associated with the density estimates of zooplankton in this experiment was less than- that in Experiment 1, with mean coefficients of variation of 23 and 45 % (n=36) for controls and PCP-treated enclosures, respectively. The relative percent abundances of the four major groups of zooplankton reflected a greater similarity in community structure among the three control corrals (Figure 11). The three PCP- treated enclosures initially appeared to be similar with respect to community structure, however they became increasingly dissimilar toward the end of a the experiment. Corral 5 became markedly s different with the total absence of immature g Copepoda from d 21-42. ^ 3 The species composition of the S macrozooplankton communities was also similar for all three control corrals and the communities were numerically dominated by the Cladocera. D. g. mendolae, C. lacustris. B. longiroslris and Diaphanosoma brachyurum were most prevalent in Y\piTe lo. Relative percent abundance of the four major groups of zooplankton in replicate the first part of the experiment with a gradual control and PCP-treated corrals for Experiment 2. increasing dominance of D. g. mendolae. Diaptomus oregonensis became more abundant between d 28 and 42 than previously. The increase in relative percent abundance of D. oregonensis in the control corrals did not occur in the PCP-treated corrals despite this taxa being present in the first part of the experiment. Tropocyclops p. mexicanus became relatively more abundant immediately posttreatment in the enclosures treated with PCP, then it became conspicuously less abundant from d 14- 42. The microzooplankton communities within the PCP treatment were similar for about one week after treatment, however they deviated upon initiation of recovery. Kellicottia
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