首页> 外文期刊>Transactions of the Nebraska Academy of Sciences >MACROPHYTE PRODUCTION, FISH HERBIVORY, AND WATER QUALITY IN A TAILWATER RESERVOIR—LAKE OGALLALA, NEBRASKA
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MACROPHYTE PRODUCTION, FISH HERBIVORY, AND WATER QUALITY IN A TAILWATER RESERVOIR—LAKE OGALLALA, NEBRASKA

机译:尾水库—内布拉斯加州奥加拉拉湖的大型植物生产,鱼类除草剂和水质

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摘要

Nebraska Public Power District (NPPD) began monitoring aquatic-macrophyte production in Lake Ogallala, Nebraska, in 1989 because the lake provides cooling water for a coal-fired electricity generating facility—Gerald Gentleman Station (GGS). Large mats of macrophytes in the cooling water caused several trips of the generating units at GGS, at considerable cost to NPPD. The plants also support macroinvertebrates that supply food for the trout fishery in and downstream of the lake. Ceratophyllum demersum, Potamogeton spp., Myriophyllum sibiricum, and Zannichellia palustris were the most commonly observed plants. In the early 1990s, macrophyte production declined to very low levels. Fresh-weight biomass averaged 6887 g/m~2 in 1989 and declined to 20 g/m~2 in 1995. June-July water temperatures also varied, increasing slightly through 1992, then decreasing 3℃ through 1995. Fish activity in areas noted for previous high macrophyte production was suggested as a cause of decreased macrophyte production. A fish-exclosure study in 1994 and 1995 showed that herbivory and sediment-disturbance (probably by carp and white suckers) is partly responsible for the macrophyte decline, but productivity in the protected areas did not return to the high levels observed in the late 1980s.
机译:内布拉斯加州公共电力区(NPPD)于1989年开始监视内布拉斯加州奥加拉拉湖的水生植物的生产,因为该湖为燃煤发电设施杰拉德绅士站(GGS)提供冷却水。冷却水中的大型植物丛在GGS上导致了发电机组的几次跳闸,这对NPPD而言是相当大的成本。这些植物还支持大型无脊椎动物,这些大型无脊椎动物为湖中和下游的鳟鱼渔业提供食物。最常观察到的植物有金角菊,波达莫顿属,西伯利亚桃金娘和大叶紫薇。在1990年代初期,大型植物的产量下降到非常低的水平。淡水生物量在1989年平均为68​​87 g / m〜2,在1995年下降到20 g / m〜2。6-7月份的水温也有所变化,到1992年略有升高,然后到1995年降低了3℃。以前的大型植物产量高被认为是大型植物产量下降的原因。 1994年和1995年进行的鱼类隔离研究表明,食草和沉积物扰动(可能是鲤鱼和白色吮吸者)在一定程度上造成了大型植物的衰退,但保护区的生产力并未恢复到1980年代后期的高水平。

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