Spatial Distribution of Macroinvertebrate Community along a Longitudinal Gradient in a Eutrophic Reservoir‐Bay during Different Impoundment Stages, China
Spatial Distribution of Macroinvertebrate Community along a Longitudinal Gradient in a Eutrophic Reservoir‐Bay during Different Impoundment Stages, China
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DOI：
10.1002/iroh.201111488
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发表时间：
2012-06
影响因子：
1.9
通讯作者：
Min Zhang;Q. Cai;Yaoyang Xu;Linghui Kong;Lu Tan;Lan Wang
中科院分区：
文献类型：
--
作者：
Min Zhang;Q. Cai;Yaoyang Xu;Linghui Kong;Lu Tan;Lan Wang
为探讨水位波动对大型底栖动物群落的影响，于2006年10月和2010年7月对三峡水库香溪湾第二、三蓄水期大型底栖动物群落的纵向格局进行了调查。通过与第一蓄水阶段（年际WLF 4 m）的研究结果对比，发现香溪湾在3个不同的蓄水阶段均以寡毛纲为主。而大型无脊椎动物的总丰度在第1 ~第2阶段（年际WLF 11 m）呈急剧下降趋势，在第2 ~第3阶段（年际WLF 30 m）变化不大。这表明第二阶段较高的WLF已经大大降低了大型无脊椎动物的丰度，因此第三阶段的干扰只能轻微影响已经降低的丰度。根据大型底栖动物的密度、生物量和类群丰富度，结合各站点的地理位置，将其纵向划分为主流区、湖泊区和过渡区。不同区域间大型底栖动物密度和生物量差异显著（P0.05）.双向指示种分析表明，从第2阶段开始，大部分样地的群落类型在不同季节发生变化，呈现动态地带性格局，与第1阶段的稳定格局不同。这种季节性特征与WLF的季节性变化有关。((c)2012 WILEY-VCH Verlag GmbH & Co. KGaA，魏因海姆）
The longitudinal patterns of the macroinvertebrate community in the Xiangxi Bay of the Three Gorges Reservoir (TGR) were investigated during the second (2nd) and third (3rd) impoundment stages (October 2006July 2010), to test the effects of increased water level fluctuations (WLF) on the macroinvertebrates. By comparing to the former reports of the first (1st) impoundment stage (inter-annual WLF 4 m), we found that oligochaetes dominated in three different stages in the Xiangxi Bay. However, the total abundance of macroinvertebrates showed a dramatical decline from the 1st to 2nd stage (inter-annual WLF 11 m), but changed slightly from the 2nd to 3rd stage (inter-annual WLF 30 m). This indicated that higher WLF in the 2nd stage had already greatly reduced the macroinvertebrates abundance, thereby the disturbance in the 3rd stage could only slightly affect the already reduced abundance. Three longitudinal zones (the mainstream zone, the lacustrine zone and the transitional zone) were found based on the macroinvertebrate density, biomass, and taxa richness, combined with the geographical location of each site. Significant differences in density and biomass of macroinvertebrate were found among different zones (P 0.05). Two-way indicator species analysis showed that the community type in most sites varied in different seasons from the 2nd stage, exhibiting a dynamic zonation pattern, which differed with the stable pattern of the 1st stage. This seasonal feature was coupled to the seasonal changes of the WLF. ((c) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)