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Effect of N and P enrichment on periphytic algal community succession in a tropical oligotrophic reservoir

机译：氮和磷富集对热带贫营养油藏藻类藻类群落演替的影响

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摘要

This enrichment experiment was conducted to evaluate how nutrient availability drives colonization and succession of a periphytic algal community in a Brazilian tropical oligotrophic reservoir. Four treatments were designed using enclosures (n = 3): control (no nutrient addition), P+ (isolated phosphorus addition, N-limiting condition); N+ (isolated nitrogen addition, P-limiting condition), and NP+ (phosphorus and nitrogen combined addition, no limitation). Glass microscope slides were used for periphyton growth. Samplings were carried out at short, regular intervals (3–5 days) over 31 days. Isolated P addition promoted the highest structural organization, and both NP+ and P+ promoted the highest biomass accrual. Control condition favored Chromulina elegans (chrysophyte) dominance, whereas enrichment favored different species descriptors belonging mainly to cyanobacteria (N+) and green algae (P+, NP+). Phosphorus was the main environmental driver in the community structural changes. All periphyton attributes were significantly affected by enrichments in the advanced successional stages, when species were strongly associated to different amendments. Periphytic algal community was quite sensitive to enrichments, allowing identification of successional sequences in each treatment; however, colonization time is relevant when monitoring strategies are considered.
机译：进行了该浓缩实验，以评估养分的可利用性如何驱动巴西热带贫营养水库中附生藻类群落的定殖和演替。使用围栏（n = 3）设计了四种处理方法：对照（不添加营养物），P +（孤立的磷添加，N限制条件）； N +（孤立的氮添加，P限制条件）和NP +（磷和氮的组合添加，无限制）。玻璃显微镜载玻片用于周生植物的生长。在31天之内定期进行采样（3-5天）。单独添加P促进了最高的结构组织，而NP +和P +促进了最高的生物量积累。控制条件有利于秀丽线虫（Chromulina elegans）（chrysophyte）的优势，而富集有利于主要属于蓝细菌（N +）和绿藻（P +，NP +）的不同物种描述符。磷是社区结构变化的主要环境驱动因素。当物种与不同的修饰强烈相关时，所有高级植物演替阶段的富集都显着影响了周围植物的属性。附生藻类群落对富集非常敏感，可以确定每种处理中的演替序列。但是，在考虑监测策略时，定植时间很重要。

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