Pennsylvania Sea Grant, The Pennsylvania State University, 301 Peninsula Dr, Erie, PA, 16505, USA,
Environ Monit Assess. 2013 Dec;185(12):10459-71. doi: 10.1007/s10661-013-3344-7. Epub 2013 Jul 24.
An index of biotic integrity and species richness were used to assess changes in the Presque Isle Bay watershed fish community before and after the elimination of combined sewer overflows (CSOs). The fish community was sampled with a backpack electrofisher in 2011 at 12 stream locations on 4 tributaries of Presque Isle Bay, Erie County, Pennsylvania. All sites were previously sampled in 2001. Significant increases in species richness and index of biotic integrity (IBI) scores were observed in 2011 compared to 2001. The significant increases in species richness and IBI scores occurred following the elimination of 10 CSOs to Garrison Run, 7 CSOs to Cascade Creek, and 37 CSOs to Mill Creek. Despite the increased richness and IBI scores, the fish community remains in poor condition, which may be related to the highly urbanized land use of the watershed. Urban land uses comprise 77% of the Presque Isle Bay watershed, and in both 2011 and 2001, the watershed as a whole did not meet warm-water habitat criteria. It is unlikely that the fish community will continue to recover without addressing urbanization throughout the watershed.
采用生物完整性指数和物种丰富度指数来评估在消除合流污水溢流（CSO）前后，普雷斯克岛湾流域鱼类群落的变化。2011 年，在宾夕法尼亚州伊利县普雷斯克岛湾的 4 条支流的 12 个溪流地点，使用背包式电鱼器对鱼类群落进行了采样。所有地点之前都在 2001 年进行过采样。与 2001 年相比，2011 年观察到物种丰富度和生物完整性指数（IBI）得分显著增加。在消除了 10 个到加里森溪的 CSO、7 个到级联溪的 CSO 和 37 个到米尔溪的 CSO 后，物种丰富度和 IBI 得分显著增加。尽管丰富度和 IBI 得分增加，但鱼类群落状况仍然不佳，这可能与流域高度城市化的土地利用有关。城市土地利用占普雷斯克岛湾流域的 77%，在 2011 年和 2001 年，整个流域都不符合暖水栖息地标准。如果不解决整个流域的城市化问题，鱼类群落不太可能继续恢复。
