Metadate bentos 2016, 2017 Meandre Sf. Gheorghe, PN 16.45.05.03

The study presents the results of qualitative and quantitative analysis of benthic fauna associations of Sfantu Gheorghe branch meanders of Danube Delta, Romania, performed in June 2016 and September 2017, respectively. Following the anthropogenic hydromorphological changes suffered by the Sfantu Gheorghe branch in ‘90s caused by cutting its length with about 35%, along with the increasing of industrialization and agricultural activities favoured by the opening of the channel to the navigation, the benthic fauna underwent a series of changes in terms of diversity and abundance. Based on 56 samples collected in 2016 and 2017, 51 taxa, belonging to 20 major groups in both years and average abundances of 265,440 ind.m-2, in September 2016 and 12,402.4 ind.m-2 in June 2017 were found. Our findings suggest that a slightly improving of the quality of the environment within the study area has occurred after 2000’s years due to progressive reducing of impact generated by the above-mentioned activities.本研究报道了罗马尼亚多瑙河三角洲圣乔治（Sfantu Gheorghe）分支河曲底栖动物群落的定性与定量分析结果，采样工作分别于2016年6月与2017年9月开展。20世纪90年代，圣乔治分支因河道裁弯取直缩短了约35%的河道长度，加之航道开通后工业化与农业活动愈发兴盛，该河道经历了一系列人为水文形态变化。受此影响，底栖动物群落在多样性与丰度层面均发生了一系列变化。基于2016年与2017年采集的56份样本，本研究共记录到51个分类单元，两年间这些类群均隶属于20个大类群；平均丰度方面，2016年9月为265440个·米⁻²，2017年6月为12402.4个·米⁻²。本研究结果显示，由于上述人类活动带来的影响逐步减弱，研究区域的环境质量自21世纪初以来已出现小幅改善。