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首页> 外文期刊>Hydrobiologia >Periphytic algal community adaptive strategies in N and P enriched experiments in a tropical oligotrophic reservoir
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Periphytic algal community adaptive strategies in N and P enriched experiments in a tropical oligotrophic reservoir

机译：热带贫营养油藏富氮和富磷实验中的附生藻类群落适应策略

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摘要

This study aimed at evaluating periphytic algae adaptive strategies, including size class, growth, and adherence forms, and the CRS functional groups model under nitrogen and phosphorus artificial enrichment in a Brazilian tropical shallow and oligotrophic reservoir. Four treatments were designed using enclosures (n = 3) filled with 185 L of reservoir water: control (no nutrient addition), P+ (isolated P addition, N-limiting condition); N+ (isolated N addition, P-limiting condition); and NP+ (combined addition, no limitation). N:P ratios were maintained throughout the experiment. Glass slides were used for periphyton growth, and sampling campaigns were carried out at short regular intervals (3-5 days) over a 31-day succession. Enrichment favored replacement of flagellates and loosely attached (mobile) forms by firmly attached mainly prostrate and entangled forms over succession. Isolated or combined P addition favored C-S-strategists green algae, whereas P limitation kept R-strategists over succession, promoting R-Cyanobacteria under high P limitation. Our results were supported by the species density and biovolume due to the dominance of small size classes (small-sized classes) in the community (nano and picoperiphyton). Overall, only the CRS strategies were more predictive of the experimental nutritional conditions.
机译：本研究旨在评估巴西热带浅水和贫营养油藏在氮和磷人工富集条件下的附生藻类适应策略，包括大小类别，生长和粘附形式以及CRS官能团模型。使用装有185 L储水的围栏（n = 3）设计了四种处理方法：对照（不添加营养物），P +（隔离的P添加，N限制条件）; N +（隔离的N加成，P限制条件）;和NP +（组合添加，无限制）。在整个实验过程中保持N：P比率。载玻片用于水生植物的生长，并在连续31天的短间隔内（3-5天）进行采样活动。富集有利于鞭毛和松散附着的（活动）形式的替换，因为它们牢固地附着在俯冲和纠缠的形式上，而不是连续的。单独添加或联合添加磷有利于C-S-策略家绿藻，而P限制使R-策略家过度继承，在高P限制下促进R-蓝藻。我们的研究结果得到了社区（纳米和皮齿藻）中小规模种类（小规模种类）的主导，物种密度和生物量的支持。总体而言，只有CRS策略才能更好地预测实验营养状况。

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