Aragão-Tavares N K C, Severiano J S, Moura A N
Programa de Pós-Graduação em Botânica, Departamento de Biologia, Universidade Federal Rural de Pernambuco, Recife, PE, BR.
Braz J Biol. 2015 Aug;75(3):616-27. doi: 10.1590/1519-6984.19413. Epub 2015 Aug 25.
The installation of dams causes changes to the integrity of rivers and to the water cycle, performing an instrumental role in the organization of biological communities, including that of phytoplankton. In the present study, we analyzed the taxonomic composition of phytoplankton in two hydroelectric reservoirs on the São Francisco River, Itaparica and Xingó reservoirs. Samples were collected at quarterly intervals between December 2007 and September 2009, at 12 sampling stations in each reservoir, totaling 92 samples. We identified 110 species in the Itaparica reservoir and 136 in the Xingó reservoir, of which diatoms followed by green algae, played a major contribution to both reservoirs. Most of the species is rare and/or occasional. In the Itaparica reservoir, there were no very frequent species, although in the Xingó this category was represented by the diatoms Aulacoseira granulata (Ehrenberg) Simonsen and Fragilaria crotonensis Kitton. These results show that, despite the similarity in the composition of phytoplankton, the reservoirs studied certainly differed regarding their environmental conditions.
水坝的修建会改变河流的完整性和水循环，对包括浮游植物在内的生物群落的组织起着重要作用。在本研究中，我们分析了圣弗朗西斯科河上伊塔帕里卡和辛古两座水电站水库中浮游植物的分类组成。2007年12月至2009年9月期间，每隔季度在每个水库的12个采样站采集样本，共采集92个样本。我们在伊塔帕里卡水库鉴定出110个物种，在辛古水库鉴定出136个物种，其中硅藻其次是绿藻，对两个水库的贡献最大。大多数物种较为罕见和/或偶尔出现。在伊塔帕里卡水库中，没有非常常见的物种，尽管在辛古水库中，这一类由硅藻颗粒直链藻（Ehrenberg）西蒙森和克罗顿脆杆藻代表。这些结果表明，尽管浮游植物组成相似，但所研究的水库在环境条件方面肯定存在差异。
