Toledo J J, Penha J
Programa de Pós-graduação em Ecologia e Conservação da Biodiversidade, Instituto de Biociências, Universidade Federal de Mato Grosso.
Braz J Biol. 2011 Feb;71(1):37-45. doi: 10.1590/s1519-69842011000100007.
The increasing release of untreated fish farming effluents into water courses that flow to the Pantanal wetlands in Mato Grosso (Brazil) may drive this ecosystem to eutrophication. Therefore, the growth of Azolla caroliniana Willd. and Salvinia auriculata Aubl. in fish farming effluent and their effect on its quality were evaluated for 48 days in a greenhouse. The results were compared to those obtained in a nutrient rich solution (Hoagland ½ medium). Azolla caroliniana showed lower relative growth rate in fish farming effluent (0.020 d-1) than in Hoagland ½ medium (0.029 d-1). However, S. auriculata grew slightly better in fish farming effluent (0.030 d-1) than in Hoagland ½ medium (0.025 d-1). The species apparently contributed to reduce nitrate and phosphate concentration in Hoagland ½ medium. However, in fish farming effluent, only electrical conductivity and pH were reduced by plants compared to the control without plants. Thus, A. caroliniana and S. auriculata show low potential for improving effluent quality.
未经处理的养鱼废水不断排入流向巴西马托格罗索州潘塔纳尔湿地的水道，这可能会导致该生态系统富营养化。因此，在温室中对卡罗来纳满江红（Azolla caroliniana Willd.）和耳叶满江红（Salvinia auriculata Aubl.）在养鱼废水中的生长情况及其对废水水质的影响进行了48天的评估。将结果与在富营养溶液（霍格兰半强度培养基）中获得的结果进行比较。卡罗来纳满江红在养鱼废水中的相对生长率（0.020 d-1）低于在霍格兰半强度培养基中的相对生长率（0.029 d-1）。然而，耳叶满江红在养鱼废水中（0.030 d-1）的生长略好于在霍格兰半强度培养基中（0.025 d-1）。该物种显然有助于降低霍格兰半强度培养基中的硝酸盐和磷酸盐浓度。然而，在养鱼废水中，与无植物对照相比，植物仅降低了电导率和pH值。因此，卡罗来纳满江红和耳叶满江红改善废水水质的潜力较低。
