Gaytan-Herrera Martha Leticia, Martinez-Almeida Víctor, Oliva-Martinez Maria Guadalupe, Duran-Diaz Angel, Ramirez-Garcia Pedro
Research and Postgraduate Division (UIICSE-CyMA Project), Universided Nacional Autonoma De Mexico/FES-Iztacala, Avenida de los Barrios No. 1,54090 Tlalnepantla, Estado de Mexico, Mexico.
J Environ Biol. 2011 Jan;32(1):117-26.
Valle de Bravo reservoir is used for aquatic, fishing and as a source of drinking water to Mexico City. Annual data on composition, abundances, species richness and diversity of the phytoplankton surface community and some physical-chemical parameters variations were discussed. Results showed a spatial homogeneity for environmental descriptors and phytoplankton samples but a temporal significant difference between months. Pulses of high algal densities corresponded to late stratification (October, 103 x 10(3) cell ml(-1)), early stratification (April, 107 x 10(3) cell ml(-1)) and plenty stratification (June, 69 x 10(3) cell ml(-1)). Taxa that reached higher densities were: Microcystis spp., Snowella septentrionalis, Anabaena spp., Aphanizomenon yezoense and Fragilaria crotonensis. Contribution of each taxon to the total phytoplankton density showed that majorities were rare (41%) or dominants (40%). Frequent alternation between pulses and low densities and diversity of phytoplankton as well as a relative high number of taxa found (68), could be explained by daily strong winds, unstable epilimnion thickness and incorporation and extraction of substantial volumes of water occurred in the reservoir. Dominances of cyanobacteria and some chlorococcal species and a high temporal fluctuated Shannon-Wiener diversity index (0.45- 2.35 bits) pointing to eutrophic and perturbed conditions.
巴耶德布拉沃水库用于水产养殖、捕鱼，并作为墨西哥城的饮用水源。讨论了浮游植物表层群落的组成、丰度、物种丰富度和多样性的年度数据以及一些理化参数的变化。结果表明，环境描述符和浮游植物样本在空间上具有同质性，但月份之间存在显著的时间差异。高藻类密度脉冲分别对应于后期分层（10月，103×10³个细胞/毫升）、早期分层（4月，107×10³个细胞/毫升）和充分分层（6月，69×10³个细胞/毫升）。达到较高密度的分类群有：微囊藻属、北方雪藻、鱼腥藻属、阿氏浮丝藻和克罗顿脆杆藻。各分类群对浮游植物总密度的贡献表明，大多数为稀有种类（41%）或优势种类（40%）。脉冲和低密度之间的频繁交替以及浮游植物的多样性，以及发现的相对大量的分类群（68个），可以用每日强风、不稳定的混合层厚度以及水库中大量水体的进出加以解释。蓝藻和一些绿球藻种类的优势以及高时间波动的香农-维纳多样性指数（0.45 - 2.35比特）表明存在富营养化和受干扰的状况。
