One of the consequences of global mining is the exposure of metals into the environment, caused by the rupture of tailings dams. Excess of metals, such as aluminum (Al) and manganese (Mn) can cause serious damage to fauna and flora. The presence of these metals, associated with the temperature increase that occurs nowadays can potentially increase biochemical and metabolic rates in plant tissues and may affect growth. Therefore, the objective of this work was to evaluate the toxicity of the metals Al and Mn into the biomass' growth of the macrophyte Ricciocarpos natans, under two temperatures (25 and 27 °C). R. natans individuals (n = 10 ± 0.5 cm wide) were exposed during 30 days to Al (1.5; 2.5 and 5.0 mg L-1) and Mn (0.7; 1.5 and 3.0 mg L-1) at temperatures and photoperiod-controlled germination chambers. Fresh macrophyte masses were determined gravimetrically to determine the kinetic growth using a logistic model. With that, it was noticed that the presence of Al interfered negatively in the increase of the R. natans biomass, mainly in the highest concentrations and at 27 °C. Mn, on the other hand, affected the increase in biomass, mainly in the highest concentration. As a result, the growth coefficients (μ) changed, being up to 4 times lower in the Al bioassays and up to 2 times higher than the control in the Mn bioassays. However, the dry R. natans biomass individuals that were exposed to the treatments was reduced when compared to the control, except for the lower concentration of Mn. These results contribute to the understanding of the environmental changes that can occur due to metals contained in mining tailings in aquatic ecosystems and the influence of global warming on the metabolic processes of the growth of aquatic macrophytes.

中文翻译：

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水生植物Ricciocarpos natans（L.）Corda在不同温度和铝和锰的不同浓度下的生长。

全球采矿的后果之一是由于尾矿坝破裂而使金属暴露于环境中。金属（例如铝（Al）和锰（Mn））过多会严重损害动植物。这些金属的存在与当今发生的温度升高有关，可能会增加植物组织中的生化和代谢率，并可能影响生长。因此，这项工作的目的是评估在两个温度（25和27°C）下金属铝和锰对大型植物Ricciocarpos natans生物量生长的毒性。R. natans个体（n = 10±0.5 cm宽）在30天内在温度和光周期控制下暴露于Al（1.5; 2.5和5.0 mg L-1）和Mn（0.7; 1.5和3.0 mg L-1）中发芽室。使用逻辑模型通过重量法确定新鲜的大型植物质量，以确定动力学增长。由此可见，铝的存在对纳丹红球菌生物量的增加产生了负面影响，主要是在最高浓度和27°C下。另一方面，Mn影响生物量的增加，主要是在最高浓度下。结果，生长系数（μ）发生了变化，在Al生物测定中降低了4倍，在Mn生物测定中提高了2倍。然而，与对照组相比，暴露于处理的干燥的R. natans生物量个体有所降低，但锰的浓度较低。