调查数据不确定性对崇明岛临近水域鱼类生物完整性指数结果的影响

为分析数据不确定性对鱼类生物完整性指数评价结果的影响，基于崇明岛附近水域历史研究资料和生态系统特征，初步构建鱼类生物完整性指数评价体系，该评价体系涵盖种类组成、耐受性、营养结构、繁殖共位群及健康状况和生物量5类属性的12个指标，并评估该水域2020年8月和11月鱼类生物完整性状况。在此基础上分别从5类属性的指标中各抽取1个作为评价指标(鱼类种类数、游泳动物食性、鱼类数量比例等),通过计算机模拟分别估算单一指标和5个指标共同变异系数为30%时，崇明岛附近水域鱼类生物完整性指数变化情况。同时，比较了不同的变异水平对鱼类生物完整性指数评价结果的影响程度。结果表明，崇明岛附近水域2020年8—11月间的鱼类生物完整性处于“差”等级。数据不确定分析结果显示，指标监测值存在30%变异时，崇明岛附近水域鱼类生物完整性评价结论虽未发生改变，但是鱼类生物完整性得分发生一定程度的变化。并且，随着指标监测值不确定性的增加，崇明岛附近水域鱼类生物完整性指数评价结果的波动程度逐渐增加。分析结果表明，指标监测值不确定性对评价结果的影响程度与监测值在鱼类生物完整性指数各赋分区段的具体位置有关。本研究结果强调了基于鱼...

Effects of survey data uncertainty on the results of fish-index of biological integrity in waters near Chongming Island

In order to analyze the impact of data uncertainty on the results of fish-index of biological integrity(F-IBI), this study constructed a F-IBI based on the historical information and ecosystem characteristics of the surrounding waters of Chongming Island, China. A total of 12 indices relate to fish species composition, trophic structure, tolerance, reproductive character, heath conditions and biomass were included in this F-IBI. Fish community information in waters near Chongming Island were collected from surveys in August and November 2020. The F-IBI was used to evaluate the state of ecosystem health of study area. Besides, the effects of survey data uncertainty on the projection of F-IBI for the surrounding waters of Chongming Island were evaluated by computer simulation. Five indices (total number of fish species, percentage of number of pollution sensitive fishes, percentage of number of piscivorous species, percentage of number of adhesive egg fishes and abundance per haul per hour) from 12 indices were selected as simulate indices. The effect of single index uncertainty, multiple indices uncertainty and different level of uncertainty on the final estimation result of F-IBI were evaluated. Results indicated that the F-IBI was in the "poor" grade of the surrounding waters of Chongming Island in August and November 2020. Uncertainty analysis showed that a set of 30% at the coefficient of variance of indices did not affect the evaluation grade of F-IBI, but the score changed to a certain extent. With the increase of index uncertainty, the fluctuation range of the evaluation results of F-IBI increased gradually. The influence strength of each index was related with the position of survey data at the range in the scoring section of F-IBI system. The results of this study emphasize the importance of considering the natural fluctuation range of the evaluation index in the evaluation of F-IBI in waters near Chongming Island.