Hanabanilla Reservoir, south-central Cuba, is used for electric power generation, potable water supply and tourism. We examined stratigraphic shifts in algal assemblages that accumulated in the reservoir sediments from the time of construction in 1960 through 2012, and inferred the environmental drivers of such biological changes. Historical fluctuations in algal assemblages were driven by scouring of the reservoir bottom, changing water level, and input of organic matter and nitrogen to the water body. Stage records, in conjunction with algal counts, confirm the importance of the pennate/centric diatom ratio for reconstructing past water-level changes. Although nutrient and organic matter inputs to the reservoir also influenced algal abundance and community composition, our findings suggest that regulating reservoir hydrology could be an effective strategy for preventing future cyanobacterial blooms. Shifts in the relative abundances of algal taxa, and dominance of R strategists associated with extreme fluctuations in water level, showed the strong influence of hydrology as a determinant of primary producer assemblage structure.

中文翻译：

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古巴Hanabanilla水库藻类组合变化50年沉积记录

古巴中南部的哈纳巴尼拉水库用于发电、饮用水供应和旅游。我们检查了从 1960 年到 2012 年建造时在水库沉积物中积累的藻类组合的地层变化，并推断了这种生物变化的环境驱动因素。藻类组合的历史波动是由水库底部的冲刷、水位变化以及有机物和氮输入水体驱动的。阶段记录与藻类计数相结合，证实了羽状/中心硅藻比率对于重建过去水位变化的重要性。虽然水库的养分和有机质输入也影响了藻类丰度和群落组成，我们的研究结果表明，调节水库水文可能是预防未来蓝藻水华的有效策略。藻类分类群相对丰度的变化，以及与水位极端波动相关的 R 战略家的主导地位，表明水文作为初级生产者组合结构的决定因素的强烈影响。