一条新热带河流浮游动物空间动态的驱动因素

Q2 Environmental Science
P. H. Picapedra, C. Fernandes, G. Baumgartner, P. Sanches
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引用次数: 3

摘要

摘要目的研究巴西某河流系统(Paranaíba河子流域)浮游动物群落的结构和空间格局,并评价牛轭湖在该群落动态中的作用。方法在旱季和雨季分别在牛牛湖和阿泊泊河河床采集浮游动物样本。我们从两个不同的带(滨海带和水道带)的表面和底部收集了这些样本。对每个水文季节进行方差分析,确定不同地点(纵向)、不同带(横向)和不同深度(纵向)浮游动物物种丰富度和丰度的差异。采用聚类分析的方法对物种组成进行相似性分析。此外,采用典型对应分析方法选择了最能解释浮游动物丰度数据变化的环境变量。结果共记录到152种,其中轮虫70种,变形虫53种,枝纲20种,桡足类9种。我们观察了在雨季和旱季沿河流纵轴的浮游动物种类丰富度和丰度的变化。然而,我们没有检测到这些属性的任何横向或纵向变化。聚类分析还表明,物种组成差异最大的是河流的纵轴。浮游动物的纵向变异主要与上游牛牛湖的影响以及下游水流速度、浊度和悬浮物浓度的变化有关。结论研究结果表明,水文特征的异质性是影响阿泊泊河浮游动物群落结构的重要因素。因此,我们强调了保护和维持这些环境的自然特征的行动的相关性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Drivers of zooplankton spatial dynamics in a small neotropical river
Abstract Aim Our objective was to describe the structure and spatial patterns of the zooplankton community in a small Brazilian river system (Paranaíba River sub-basin) and evaluate the role of an oxbow lake in the dynamics of this community. Methods Zooplankton samples were collected from sites located in an oxbow lake and the Aporé River bed during the rainy and dry seasons. We collected these samples from the surface and bottom levels of two different zones (littoral and channel). For each hydrological season, analysis of variance was conducted to determine the differences in species richness and abundance of zooplankton among different sites (longitudinal), zones (lateral), and depths (vertical). Cluster analysis was performed to assess the similarity in species composition. In addition, a canonical correspondence analysis was used to select the environmental variables that best explained the variation in zooplankton abundance data. Results We recorded 152 species: 70 rotifers, 53 testate amoebae, 20 cladocerans, and 9 copepods. We observed changes in the species richness and abundance of zooplankton along the longitudinal axis of the river in both the rainy and dry seasons. However, we did not detect any lateral or vertical changes in these attributes. Cluster analysis also indicated that the greatest differences in species composition were in the longitudinal axis of the river. The longitudinal variability of zooplankton was mainly associated with the influence of an upstream oxbow lake, as well as the changes in water flow velocity, turbidity, and concentrations of suspended solids downstream. Conclusions Our results demonstrate the importance of a heterogeneity of hydrological characteristics as a structuring factor of the zooplankton community in the Aporé River. Thus, we highlight the relevance of actions to protect and maintain the natural characteristics of these environments.
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来源期刊
Acta Limnologica Brasiliensia
Acta Limnologica Brasiliensia Environmental Science-Ecology
CiteScore
2.20
自引率
0.00%
发文量
17
审稿时长
50 weeks
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