Benthic invertebrate assemblages and species diversity patterns of the upper Paraguay River
Benthic invertebrate assemblages and species diversity patterns of the upper Paraguay River
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DOI：
10.1002/rra.814
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发表时间：
2005-06-01
影响因子：
2.2
通讯作者：
De Drago, IE
中科院分区：
文献类型：
--
作者：
Marchese, MR;Wantzen, KM;De Drago, IE
本文介绍了第一次研究的底栖无脊椎动物组合的巴拉圭河，在巴西潘塔纳尔湿地的主要支流的上段。2000年11月，在卡塞雷斯市以下沿着200公里的地段对38个地点进行了取样。共鉴定出69种和形态种，以寡毛纲和摇蚊科为主。底栖无脊椎动物平均密度在河曲段为72 ~ 10354 m（-2），在直线过渡段为3611-49629 m（-2），在河漫滩湖泊为682-5962 m（-2），河漫滩河道为1704-2208 m（-2）。最高的密度达到砂砾石沉积物占主导地位的沙生寡毛类Narapa bonettoi。Shannon多样性指数在0.75 ~ 2.08之间，洪泛区湖泊多样性指数最高。统计分析（UPGMA和CCA）显示，底栖动物组合在河漫滩栖息地明显不同于河流栖息地。在河道中，栖息地区分粒度，而河漫滩栖息地主要是由电流和粉质粘土浓度（河漫滩渠道）或有机质浓度（河漫滩湖泊）。在上巴拉圭地区的保护工作的目标应该是保持洪水脉冲作为一个永久的来源的空间和时间的栖息地异质性。版权所有（c）2005年约翰威利父子有限公司。
This paper presents the first study of the benthic invertebrate assemblages of the upper section of the Paraguay River, a major tributary to the Pantanal wetland in Brazil. Thirty-eight sites were sampled along a 200 km section below the city of Caceres in November 2000. Sixty-nine species and morphospecies were identified, which were dominated by Oligochaeta and Chironomidae. Mean density of benthic invertebrates varied between 72 and 10 354 m(-2) in the meandering sector of the river, 3611-49629 m(-2) in the straight-transitional sectors, 682-5962 m(-2) in the floodplain lakes, and 1704-2208 m(-2) in floodplain channels. Highest densities were attained in sand-gravel sediments dominated by the psammophilous oligochaete Narapa bonettoi. The Shannon diversity index ranged from 0.75 to 2.08 and was highest in floodplain lakes. Statistical analysis (UPGMA and CCA) revealed that benthic assemblages in the floodplain habitats were clearly distinct from the riverine habitats. In the river channel, the habitats were distinguished by grain size while the floodplain habitats were mostly determined by current and silt-clay concentration (floodplain channels) or by organic matter concentration (floodplain lakes). Conservation efforts in the Upper Paraguay area should aim to maintain the flood pulse as a permanent source of spatial and temporal habitat heterogeneity. Copyright (c) 2005 John Wiley & Sons, Ltd.