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首页> 外文期刊>Limnology >Periphyton nutrient content, biomass and algal community on artificial substrate: response to experimental nutrient enrichment and the effect of its interruption in a tropical reservoir
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Periphyton nutrient content, biomass and algal community on artificial substrate: response to experimental nutrient enrichment and the effect of its interruption in a tropical reservoir

机译：人工底物上的植物高核营养含量，生物质和藻类群落：对实验养分富集的反应及其中断在热带水库中的影响

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摘要

Periphyton plays an important functional role in the retention of nutrients in aquatic ecosystems, especially phosphorus. We evaluated the effects of enrichment with N and P and the effect after 20 days of no additional N and P on periphyton on artificial substratum in open-bottom mesocosms. The aim was to jointly evaluate periphyton, phytoplankton and zooplankton in the presence of macrophytes. Experimental conditions simulated natural conditions and nutrient addition was based on the maximum concentration recorded in mesotrophic reservoir. Our hypothesis is that the periphyton is sensitive to the effects of N and P enrichment and its interruption, despite the positive response of phytoplankton and zooplankton. Two treatments were designed using open-bottom mesocosms (n = 3): control (no nutrient addition); NP+ (combined phosphorus and nitrogen addition). Sampling for the measurement of biotic and abiotic variables was performed, with 10 days of continuous enrichment, on the 3rd, 6th and 11th, and 20 days after enrichment had ended (31st day). Periphyton chlorophyll a, dry mass and algal density increased significantly with the addition of N and P and decreased 20 days after the interruption of the enrichment. The highest periphyton P content was found in the NP+ treatment. The enrichment had a positive effect on Chrysophyceae (Chromulina spp.) and rotifer (Polyarthra spp.) density and the interruption of enrichment favored Bacillariophyceae (Gomphonema sp.) and rotifers (Gastropus stylifer). Phytoplankton responded positively to enrichment. Along with the high macrophyte coverage over the experimental period, we evidenced the positive effect enrichment had on phytoplankton biomass and zooplankton abundance. Therefore, periphyton on artificial substrate was sensitive to effects of N and P enrichment and its interruption, responding promptly to changes in nutrient availability in a scenario of high competition and grazing.
机译：Periphyton在水生生态系统中保留营养成分，尤其是磷的重要功能作用。我们评估了富集N和P的富集的影响，并且在露天底部核科学的人工底层上没有额外的n和p and额外的n和p。目的是在宏观物质存在下共同评估Periphyton，Phytoplankton和Zooplankton。实验条件模拟天然条件和营养加入是基于在脑培素储层中记录的最大浓度。尽管Phytoplankton和Zooplankton的积极反应，我们的假设是珀西顿对N和P浓缩及其中断的影响敏感。使用露天底部Mesocosms（n = 3）设计了两种治疗方法：对照（没有营养加法）; NP +（组合磷和氮添加）。对生物和非生物变量的测量进行抽样进行，在富集结束后的第3,6和11日，第3,6和第11天（第31天），在连续10天内进行。哌利京龙叶绿素A，干料和藻类密度随着N和P的添加而显着增加，并在富集中断后20天降低。在NP +治疗中发现了最高的Periphyton P含量。富集对甜菜糖（Chrolulina SPP）和Rotifer（Polyarthra SPP）的浓度产生了积极的影响。密度和富集的中断有利的杆菌（Gomphonema sp.）和轮虫（胃肠杆菌钳）。 Phytoplankton积极回应富集。随着实验期间的高宏体覆盖率，我们证明了积极的浓缩富集对浮游植物生物量和浮游动物丰富。因此，人工底物上的Periphyton对N和P浓缩的影响及其中断敏感，迅速响应了高竞争和放牧场景中养分可用性的变化。

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