Dauphin Island Sea Laboratory, Dauphin Island, AL 36528, USA.
J Hazard Mater. 2011 Jul 15;191(1-3):356-65. doi: 10.1016/j.jhazmat.2011.04.091. Epub 2011 Apr 29.
The overarching goal of this in situ study was to investigate the integrated impact(s) that metal/metalloid contamination might have on the overall health and performance of the ecologically important aquatic macrophyte, Vallisneria neotropicalis. Morphological (i.e., shoot growth-based endpoints) and photo-physiological (i.e., photosynthetic activity measured as chlorophyll a fluorescence and oxygen exchange) variables, along with aboveground tissue metal/metalloid concentrations, were measured in natural populations of V. neotropicalis that differed with respect to their anthropogenic pressure. With the exception of an overall negative effect on growth, our results suggest that there were no detrimental effects of low/moderate contamination of V. neotropicalis by trace elements (i.e., arsenic As and mercury Hg; 1.04-2.77 μg g(-1) dry wt. and 3.76-15.18 ng g(-1) dry wt., respectively) on the photosynthetic physiological performance of this species. V. neotropicalis appears to tolerate low/moderate levels of trace element contamination with little impact on plant health and performance.
本现场研究的首要目标是调查金属/类金属污染可能对生态重要的水生大型植物，南美苦草的整体健康和性能产生的综合影响。在形态学（即基于茎生长的终点）和光生理（即作为叶绿素 a 荧光和氧气交换测量的光合作用活性）变量方面，以及在具有人为压力差异的南美苦草自然种群中，测定了地上组织的金属/类金属浓度。除了对生长有整体负面影响外，我们的结果表明，低/中度微量元素污染（即砷 As 和汞 Hg；分别为 1.04-2.77μg g(-1)干重和 3.76-15.18ng g(-1)干重）对该物种的光合作用生理性能没有不利影响。南美苦草似乎能够耐受低/中度微量元素污染，对植物健康和性能的影响很小。
