Newsted John L
Department of Resource Conservation, University of Massachusetts at Amherst, Amherst, MA 01002, USA.
Ecotoxicol Environ Saf. 2004 Oct;59(2):237-43. doi: 10.1016/j.ecoenv.2003.07.009.
The role of light, temperature, and pH was evaluated on the accumulation of phenol by the green alga, Selenastrum capricornutum. All three environmental variables had a significant effect on the accumulation of phenol. Differences in phenol accumulation were observed in algae that were cultured under light or dark conditions. In the light tests, the accumulation of phenol over a temperature range of 12-28 degrees C was unimodal while in the dark test accumulation exhibited a monotonic relationship with temperature. Differences in accumulation were not simply a function of algal growth or biomass. A unimodal relationship was also observed in the pH experiments with the maximal phenol accumulation in algae occurring at pH 6 and the least at pH 10. Temperature also influenced the accumulation of phenol by algae in the pH tests. As was determined in the light tests, biomass or cell growth was not a significant factor in determining the extent of accumulation in these studies. The results from this study demonstrate that accumulation of organics by algae is not simply a partitioning process but one that can be influenced by the interaction of biotic and abiotic variables.
研究了光照、温度和pH值对绿藻羊角月芽藻积累苯酚的影响。这三个环境变量对苯酚的积累均有显著影响。在光照或黑暗条件下培养的藻类中，观察到了苯酚积累的差异。在光照试验中，在12 - 28摄氏度的温度范围内，苯酚的积累呈单峰型，而在黑暗试验中，积累与温度呈单调关系。积累的差异并非仅仅是藻类生长或生物量的函数。在pH值实验中也观察到了单峰关系，藻类中苯酚积累量在pH值为6时最大，在pH值为10时最小。在pH值试验中，温度也影响藻类对苯酚的积累。正如在光照试验中所确定的，生物量或细胞生长在这些研究中并非决定积累程度的重要因素。本研究结果表明，藻类对有机物的积累并非仅仅是一个分配过程，而是一个可受生物和非生物变量相互作用影响的过程。
