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Reduced Rainfall Increases Metabolic Rates in Upper Mixed Layers of Tropical Lakes

机译:降雨量降低增加了热带湖泊的上混合层中的代谢速率

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Ecosystem-level metabolism is a good sentinel for human and natural disturbances in freshwater systems, responding from local changes (for example, land use) to regional and global changes (for example, climate). Despite the increasing understanding of metabolic processes in tropical lakes, our knowledge on how morphometric and catchment characteristics affect metabolic responses to those changes in tropical lakes is still very scarce. We investigated how metabolic rates in the upper mixed layer of twelve Brazilian tropical lakes responded to reduced rainfall, considering their lake area and drainage area ratio and the percentage of native forest cover in their drainage area. An 80% reduction in the 2013 rainy season rainfall, compared with 2012, resulted in a reduction of approximated 1 m in the water column depth, a 1-2 m deepening of the upper mixed layer, a 50% reduction in mean light availability, and a doubling in total phosphorus concentrations. These changes were associated with 38% increases in gross primary production (GPP), stimulated by higher nutrient concentrations and reduced photoinhibition. These effects of reduced rainfall were strongest in lakes with a small volume in relation to their catchment areas. Our results show that climatic-related reductions in precipitation in this tropical region will reduce lake volumes, affect temperature, water mixing, and nutrient supply with pronounced effects on lake metabolic processes and carbon cycling in this region.
机译:生态系统级代谢是一种很好的淡水系统中的人类和自然紊乱的良好哨兵,从局部变化(例如,土地使用)回应区域和全球变化(例如,气候)。尽管对热带湖泊的代谢过程越来越高,但我们对不同流量和流域特征如何影响热带湖泊的那些变化的代谢反应仍然非常稀缺。我们调查了十二个巴西热带湖泊的上层混合层中的代谢率如何降雨,考虑到其湖区和排水面积比和排水区的原生林覆盖的百分比减少。与2012年降雨量减少了80%,与2012年相比,在水柱深度下减少了近似的1米,加深上混合层1-2米,平均光可用性降低50%,并且在总磷浓度下加倍。这些变化与总初级生产(GPP)增加38%,受较高营养浓度的刺激并降低光抑制。这些降雨量降低的效果在湖泊中最强,与他们的集水区有关的较小。我们的研究结果表明,这种热带地区的降水量减少的气候有效减少将减少湖泊体积,影响温度,水混合和营养供应,在该地区的湖泊代谢过程和碳循环中对湖泊的作用。

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