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首页> 外文期刊>Limnology >Phytoplankton structure and diversity in the eutrophic-hypereutrophic reservoir Paso de las Piedras, Argentina
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Phytoplankton structure and diversity in the eutrophic-hypereutrophic reservoir Paso de las Piedras, Argentina

机译：阿根廷富营养化-超富营养化水库帕索-德拉斯彼德拉斯的浮游植物结构和多样性

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摘要

This study aimed at analyzing the phytoplankton structure and dynamics in Paso de las Piedras Reservoir, Argentina, through the study of dominant species, diversity and similarity in relation with the abiotic environment. Samples were collected weekly or biweekly (January 2004–June 2005) at four sampling stations. The reservoir experienced a seasonal progression in phytoplankton composition that underlines six successional periods, each one characterized by the dominance of one or a few species. Cyanobacteria, green algae and diatoms were the most important constituents of the reservoir’s phytoplankton. Cyanobacteria dominated during summer and early autumn, green algae during late autumn and early winter, and diatoms during winter and spring. A high abundance of R. lacustris (Cryptophyceae) was observed during late September and early October. The general pattern of species succession is coherent with the general model of plankton seasonal succession described by the PEG model; however, the major discrepancy is the extremely short clear water phase observed. Successional periods were associated with changes in abiotic variables, and they showed differences in ecological traits. Cyanobacteria-Dictyosphaerium, Cyclotella, Stephanodiscus and Anabaena-diatom periods were characterized by a low number of cells, high diversity, with both dominance and specific richness low. On the contrary, during Cyanobacteria and Cyanobacteria II periods, the highest abundance was observed associated with low diversity and high dominance.
机译：这项研究旨在通过研究与非生物环境有关的优势物种，多样性和相似性，分析阿根廷帕索－德拉斯彼德拉斯水库的浮游植物结构和动力学。每周或每两周（2004年1月至2005年6月）在四个采样站采集样品。该水库的浮游植物组成经历了季节性变化，突显了六个连续的时期，每个时期的特征都是一种或几种物种的优势。蓝细菌，绿藻和硅藻是水库浮游植物最重要的组成部分。蓝藻在夏季和初秋为主，绿藻在深秋和初冬为主，硅藻在冬季和春季为主。在9月下旬和10月初，观察到了丰富的R. lacustris（隐藻科）。物种演替的一般模式与PEG模型描述的浮游生物季节演替的一般模型相一致。然而，主要的差异是观察到的非常短的清澈水相。演替期与非生物变量的变化有关，它们表现出生态特征上的差异。蓝藻-双歧杆菌，小环藻，Stephanodiscus和Anabaena-硅藻期的特征是细胞数量少，多样性高，优势度和比丰富度低。相反，在蓝细菌和蓝细菌II时期，观察到最高的丰度与低多样性和高优势度有关。

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