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首页> 外文期刊>Environmental toxicology and chemistry >EFFECT OF COPPER ON THE PHOTOCHEMICAL EFFICIENCY, GROWTH, AND CHLOROPHYLL A BIOMASS OF NATURAL PHYTOPLANKTON ASSEMBLAGES
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EFFECT OF COPPER ON THE PHOTOCHEMICAL EFFICIENCY, GROWTH, AND CHLOROPHYLL A BIOMASS OF NATURAL PHYTOPLANKTON ASSEMBLAGES

机译：铜对天然浮游植物组合生物量的光化学效率，生长和叶绿素的影响

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In this investigation, we have tested the potential usefulness of variable fluorescence, i.e., the potential photochemical efficiency of photosystem Ⅱ (F_v/F_m), determined with a fast repetition rate fluorometer (FRRF), as an indicator of the effect of metal pollution on natural phytoplankton assemblages. Phytoplankton populations were collected from an eutrophic embayment and exposed to different copper concentrations within the ppb range for 4 d. Enhanced photosynthesis was found for Cu concentrations of 10 and 20 μg/L, at very short exposure times (1 and 5 h). However, after 72 h even at 10 μg/L of Cu, F_v/F_m-values were significantly lower than those measured in the control. The highest Cu concentration tested (80 μg/L) caused a statistically significant decrease of F_v/F_m after 5 h. This response was contrasted with parallel determinations of chlorophyll a concentration, measurements of photosynthetic O_2 production rates, and changes in the taxonomic composition and size structure of the microplankton communities. A reduction in overall particle size was found at Cu concentrations of 80 and 40 μg/L. Enhanced abundance of flagellates and the diatom P seudonitzschia pungens was observed at 20 μg/L of copper. This study demonstrates the utility of this methodological approach as a rapid, nondestructive way for detecting trace-metal toxicity on natural phytoplankton.
机译：在这项研究中，我们测试了可变荧光的潜在用途，即用快速重复速率荧光计（FRRF）确定的光系统Ⅱ的潜在光化学效率（F_v / F_m），作为金属污染对环境的影响的指标。天然浮游植物组合。从富营养化的浮游植物中收集浮游植物种群，并暴露于ppb范围内的不同铜浓度下4 d。在非常短的暴露时间（1和5小时）下，发现Cu浓度为10和20μg/ L时，光合作用增强。但是，即使在10μg/ L的铜下72小时后，F_v / F_m值也显着低于对照中测得的F_v / F_m值。测试的最高铜浓度（80μg/ L）在5小时后导致F_v / F_m的统计显着下降。该反应与叶绿素a浓度的平行测定，光合作用O_2产生速率的测定以及微浮游生物群落的分类组成和大小结构的变化形成对比。发现在Cu浓度为80和40μg/ L时，总粒径减小。铜含量为20μg/ L时，鞭毛和硅藻P seudonitzschia pungens的丰度提高。这项研究证明了这种方法学方法作为一种快速，无损检测天然浮游植物中痕量金属毒性的方法的实用性。

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