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首页> 外文期刊>Limnology >Lake restoration by biomanipulation using piscivore and Daphnia stocking; results of the biomanipulation in Japan
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Lake restoration by biomanipulation using piscivore and Daphnia stocking; results of the biomanipulation in Japan

机译：使用食草动物和水蚤放养通过生物操作恢复湖泊；日本生物操作的结果

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Biomanipulation has been employed in numerous locations throughout the world as a means for reducing phytoplankton biomass; however, it has not been employed very often in Japan. A common approach involves the introduction of piscivorous fish to reduce the abundance of planktivorous fish. In our study, to first apply biomanipulation, we stocked Lake Shirakaba (a high-altitude, protected area in a park) in central Japan with rainbow trout fingerlings and cladoceran Daphnia (Daphnia galeata) in 2000. A “pre-biomanipulation” data set (1997–1999) and “a post-biomanipulation” data set (2000–2006) allowed us to evaluate the lake's response to biomanipulation. After the biomanipulation, zoo-planktivorous pond smelt disappeared and a large population of Daphnia had been established, which substantially reduced the number of the previously dominant small cladocerans and rotifers. Water transparency increased from about 2 m (before biomanipulation) to more than 4 m (after biomanipulation). Reductions in algal biomass and increased transparency led to expansion of the submerged macrophyte Elodea nuttallii. Total phosphorus concentrations declined as well over this time period. Based on these results, we concluded that biomanipulation using piscivore and Daphnia stocking succeeded in improving lake water quality by reducing algal abundance and providing favorable conditions for the establishment of rooted plants.
机译：生物操纵已被全世界许多地方采用，以减少浮游植物生物量。但是，它在日本很少被使用。常见的方法包括引入食鱼鱼以减少浮游鱼类的数量。在我们的研究中，为了首先应用生物操作，我们于2000年在日本中部放养了虹鳟鱼苗和枝角蚤（Daphnia galeata）在日本中部的白a湖（公园中的高空保护区）。 （1997–1999）和“生物操纵后”数据集（2000–2006）使我们能够评估湖泊对生物操纵的反应。生物操纵之后，动植物池塘的气味消失了，大量的水蚤已经建立，这大大减少了以前占优势的小型锁骨和轮虫的数量。水的透明度从大约2 m（生物操作之前）增加到超过4 m（生物操作之后）。藻类生物量的减少和透明度的提高导致沉水大型植物Elodea nuttallii的扩张。在这段时间内总磷浓度也下降了。根据这些结果，我们得出结论，使用食草动物和水蚤放养进行生物操作通过减少藻类丰度并为生根植物的建立提供了有利条件，从而成功改善了湖泊水质。

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