Lake restoration in terms of ecological resilience: a numerical study of biomanipulations under bistable conditions
Lake restoration in terms of ecological resilience: a numerical study of biomanipulations under bistable conditions
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DOI：
10.5751/es-01357-100203
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发表时间：
2005-08
影响因子：
4.1
通讯作者：
T. Amemiya;Takatoshi Enomoto;A. Rossberg;N. Takamura;K. Itoh
中科院分区：
文献类型：
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作者：
T. Amemiya;Takatoshi Enomoto;A. Rossberg;N. Takamura;K. Itoh
综合水生模拟模型（CASM）的抽象版本被发现在营养物输入的中间负荷下表现出双稳态，支持替代稳态理论和浅湖的现场观测。我们对双稳态条件下生物操纵的模拟表明，食浮游动物鱼类丰度的减少不能将系统从浑浊状态切换到清澈状态。相反，发现直接减少浮游植物和碎屑是在当前模型中实现这种转变的最有效方法。这些结果意味着多种操作对于湖泊的实际恢复可能是有效的。我们讨论了多变量系统或自然系统中生态恢复力方面生物操纵的当前结果。
An abstract version of the comprehensive aquatic simulation model (CASM) is found to exhibit bistability under intermediate loading of nutrient input, supporting the alternative-stable-states theory and field observations for shallow lakes. Our simulations of biomanipulations under the bistable conditions reveal that a reduction in the abundance of zooplanktivorous fish cannot switch the system from a turbid to a clear state. Rather, a direct reduction of phytoplankton and detritus was found to be most effective to make this switch in the present model. These results imply that multiple manipulations may be effective for practical restorations of lakes. We discuss the present results of biomanipulations in terms of ecological resilience in multivariable systems or natural systems.