Department of Zoology, University of Oklahoma, 730 Van Vleet Oval, Norman, OK 73019, USA.
J Fish Biol. 2013 May;82(5):1659-70. doi: 10.1111/jfb.12108. Epub 2013 Apr 12.
Fish assemblage structure, rarefied species richness, species diversity and evenness of assemblages upstream of a reservoir in Oklahoma, U.S.A., were compared pre and post-impoundment as well as in contemporary collections from streams above and below the reservoir. There were significant shifts in assemblage structure between historical and contemporary collections above the reservoir but not between contemporary assemblages above and below the impoundment. Indicator species analysis revealed that the sand shiner Notropis stramineus and fathead minnow Pimephales promelas have declined, whereas largemouth bass Micropterus salmoides and western mosquitofish Gambusia affinis have increased in relative abundance in assemblages upstream of the impoundment. Species richness was lower in contemporary assemblages compared with historical assemblages. Furthermore, contemporary assemblages below the dam had lower species richness, diversity and evenness compared with contemporary collections above the dam. These results highlight the spatial and temporal extent of reservoirs altering fish assemblages upstream of impoundments.
美国俄克拉荷马州一座水库上游的鱼类群落结构、稀有物种丰富度、物种多样性和均匀度在水库建成前后以及水库上下游溪流的当代采集物中进行了比较。与水库以上的历史采集物相比，水库以上的当代采集物在群落结构上发生了显著变化，但与水库上下的当代群落之间没有发生变化。指示物种分析表明，沙闪光鲦鱼 Notropis stramineus 和褐首脂鲤 Pimephales promelas 的相对丰度下降，而大嘴黑鲈 Micropterus salmoides 和西部食蚊鱼 Gambusia affinis 的相对丰度增加。与历史采集物相比，当代采集物的物种丰富度较低。此外，与大坝以上的当代采集物相比，大坝以下的当代采集物的物种丰富度、多样性和均匀度较低。这些结果突出了水库对水库上游鱼类群落的空间和时间影响范围。
