Department of Plant Biology and Physiology, Université Ouaga I Joseph Ki-Zerbo, 03 B.P. 7021, Ouagadougou, 03, Burkina Faso.
Department of Biological Sciences, Nazi Boni University, 01 BP 1091, Bobo-Dioulasso, 01, Burkina Faso.
J Phycol. 2019 Aug;55(4):789-800. doi: 10.1111/jpy.12843. Epub 2019 May 18.
Anthropogenic and climatic factors are important determinants of algal distribution in aquatic systems. This study aimed to identify temporary pond-groups of phytoplankton assemblages and to establish the interactions between environmental variables and phytoplankton structure. Phytoplankton samples were collected and preserved with 5% formalin; water samples for chemical analysis were taken in August and September 2007, 2008, and 2009 in 86 ponds randomly selected in the Sahelian sector and the Sudanian sector (protected and unprotected areas) of Burkina Faso. Plankton species were examined using light microscopy and identified using standard methods. A Fuchs-Rosenthal chamber was used for algal cell counting. NMDS ordination, indicator species analysis and canonical analysis were performed using Pc-Ord and CANOCO. Kruskal-Wallis and Mann-Whitney U-tests using the software Statistica were performed to compare parameters between pond-groups. Three pond-groups were identified: the Sahelian pond-group, dominated by Lyngbya martensiana and Pseudanabaena constricta; the protected area pond-group, dominated by Euglena caudata and Trachelomonas raciborskii; and the unprotected area pond-group, dominated by Closterium venus and Euglena proxima. At P < 0.05, species composition and abundance in algal groups were mostly associated with nitrate, pH, dissolved oxygen, and conductivity. The Sahelian and the Sudanian sectors were different in pH, water transparency, and species richness. Univariate and multivariate analyses illustrate that variations in the physicochemical properties of water and algal structure followed climatic and anthropogenic gradients. The classification of ponds into algal associations demonstrated that algal assemblages may be used as reliable indicators of habitat conditions.
人为因素和气候因素是水生系统中藻类分布的重要决定因素。本研究旨在确定浮游植物组合的临时池塘群，并确定环境变量与浮游植物结构之间的相互作用。浮游植物样品用 5%甲醛采集和保存；2007 年 8 月至 9 月、2008 年和 2009 年，在布基纳法索的萨赫勒地区和苏丹地区（保护区和非保护区）随机选择的 86 个池塘中采集水样进行化学分析。使用光学显微镜检查浮游物种，并使用标准方法进行鉴定。使用 Fuchs-Rosenthal 室进行藻类细胞计数。使用 Pc-Ord 和 CANOCO 进行 NMDS 排序、指示物种分析和典范分析。使用 Statistica 软件对参数进行 Kruskal-Wallis 和 Mann-Whitney U 检验，以比较池塘组之间的参数。确定了三个池塘组：萨赫勒池塘组，以 Lyngbya martensiana 和 Pseudanabaena constricta 为主；保护区池塘组，以 Euglena caudata 和 Trachelomonas raciborskii 为主；非保护区池塘组，以 Closterium venus 和 Euglena proxima 为主。在 P < 0.05 时，藻类组的物种组成和丰度主要与硝酸盐、pH 值、溶解氧和电导率有关。萨赫勒和苏丹地区在 pH 值、水透明度和物种丰富度方面存在差异。单变量和多变量分析表明，水的理化性质和藻类结构的变化遵循气候和人为梯度。将池塘分类为藻类组合表明，藻类组合可以作为栖息地条件的可靠指标。
