Periphytic diatom ecological guilds in floodplain: Ten years after dam
Periphytic diatom ecological guilds in floodplain: Ten years after dam
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DOI：
10.1016/j.ecolind.2016.04.049
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发表时间：
2016-10-01
影响因子：
6.9
通讯作者：
Rodrigues, Liliana
中科院分区：
文献类型：
--
作者：
Algarte, Vanessa Majewski;Dunck, Barbara;Rodrigues, Liliana
滨生硅藻是河漫滩系统中重要的初级生产者。在这项研究中，我们评估了在筑坝后不久和十年后与巴拉那河直接相连的三个自然环境中，周围植物硅藻群落的物种和功能特征。分别于2001-2002年和2010-2011年高水位期采集样本。从这些环境的海岸带发现的azurea Kunth获得了周围植物样本。我们一共记录了90种硅藻。47个类群在筑坝后短期内未被发现，18个类群仅在2010-2011年被发现。相似度、多样性、beta多样性和非度量多维尺度（NMDS）分析表明，两个研究时期周边硅藻群落的种类和功能性状存在差异。水体透明度和营养物（包括氮和磷形态）的变化是影响研究期间硅藻群落的最重要变量。高剖面和活动剖面在筑坝后不久就呈现出明显的特征，10年后以高剖面和低剖面为主。高透明度、高含水和高含氮水平有利于发展高、低姿态的Gomphonema等预兆。var. augur， Synedra goulardii和Amphora sp.，而属于高姿态和运动藻类的分类群（如Eunotia indica， Nitzschia amphibia）则在相反的条件下被发现。物种更替是一个重要的多样性组成部分，它在很大程度上受到湖沼随时间变化的差异的影响。年份之间的时空差异。这些变化加强了自大坝开始运行以来，上游巴拉那河下游洪泛区环境组成部分发生的变化。(C) 2016 Elsevier Ltd.版权所有。
Periphytic diatoms are a key primary producer in floodplain systems. In this study, we assessed the species and functional traits in the periphytic diatom community in three lentic environments directly connected to the Parana River shortly after damming and a decade later. Samples were collected in 2001-2002 and 2010-2011 during high waters phase. Periphytic samples were obtained from Eichhornia azurea Kunth, found in the shore zone of these environments. We recorded a total of 90 diatom species. 47 taxa were exclusive during the period shortly after damming and 18 taxa were only found in 2010-2011. The analysis of the similarity, diversity, beta diversity and non-metric multidimensional scaling (NMDS) suggested that there were differences in the species and functional traits of the periphytic diatom community between the two study periods. Variations in water transparency and nutrient (including nitrogen and phosphorus forms) were the most important variables shaping diatom communities diatoms during the study periods. High and motile profiles were characteristic shortly after damming and taxa of high and low profiles predominated a decade later. High transparency, high water and nitrogen levels favored the development of high and low profile, such as Gomphonema augur. var. augur, Synedra goulardii and Amphora sp., whereas taxa belonging to high-profile and motile algae (e.g., Eunotia indica, Nitzschia amphibia) were found in the opposite conditions. Species turnover was an important diversity component that was greatly influenced by limnologic differences over time, represented by environmental and.terrkporal dissimilarities between the years. These changes reinforce the modifications that have occurred in the environmental component of the Upper Parana River floodplain downstream of the dam from the start of its operation. (C) 2016 Elsevier Ltd. All rights reserved.