Studies on processes and factors to regulate wetland ecosystem.

湿地生态系统调控过程与因素研究。

基本信息

批准号：
17570026
负责人：
TAKAMURA Noriko
金额：
$ 2.3万
依托单位：
National Institute for Environmental Studies
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

Exotic species common carp (Cyprinus carpio) and red swamp crayfish (Procambarus clarkii) modify communities and ecosystems as keystone species and exotic ecosystem engineers. We examined whether different densities of carp and crayfish have different impacts, and compared their density-dependent effects. Using an enclosure experiment, we investigated the relationships between carp or crayfish density and water quality, phytoplankton, nutrient dynamics, submerged macrophytes (the establishment of seeding from seed bank), zooplankton, benthic macroinvertebrates and sediment organic matter. We hypothesize that the relationship between density and response variable are either : (i) linear or (ii) non-liner (exponential saturated curve). Both carp and crayfish increased suspended solids (SS), inorganic suspended solids (ISS) and chlorophyll a (Chl.a), changed nutrient dynamics and decreased submerged macrophytes and benthic macroinvertebrates, although only carp affected on zooplankton and … More sediment organic matter. However, carp and crayfish showed different density-dependent effects. The relationships between SS,ISS,Chl.a,NH_4-N and Chironominae response to carp density were non-linear, indicating that carp have strong effects on these variables at even low density. In contrast, crayfish have a large negative effect on submerged macrophytes and the relationship was non-linear. The observed effects of carp and crayfish on these variables were probably due to a combination of bioturbation, excretion and predation, suggesting that ecosystem engineering may have pronounced impactson other community members. Also, differences in their impacts were related to functional uniqueness. We also demonstrate that an introduction of exotic ecosystem engineer such as carp and crayfish may trigger a shift from a clear water state with abundant macrophytes to a turbid state dominated by phytoplankton. Our results provide important implications for strategies to eradicate carp and crayfish. Although eliminating these species as much as possible is the best management practice for conservation and restoration of native biodiversity and ecosystem, we propose that it gives first priority to remove crayfish to conserve macrophytes. Less

外来物种普通的鲤鱼（Cyprinus Carpio）和红沼泽小龙虾（Procambarus clarkii）将社区和生态系统修改为基石物种和异国生态系统工程师。我们检查了鲤鱼和小龙虾的密度是否具有不同的影响，并比较了它们的密度依赖性效果。使用外壳实验，我们研究了鲤鱼或小龙虾密度与水质之间的关系，浮游植物，营养动力学，淹没大型植物（从种子库中建立播种），浮游动物群，底栖大型肉眼植物和沉积物有机物。我们假设密度和响应变量之间的关系要么是：（i）线性或（ii）非线器（指数饱和曲线）。鲤鱼和小龙虾都增加了悬浮固体（SS），无机悬浮固体（ISS）和叶绿素A（CHL.A），改变了营养动力学，改善了淹没的大植物和底栖大型无脑植物，尽管仅在浮游动物上受到鲤鱼的影响，并且……更多的沉积有机物。但是，鲤鱼和小龙虾显示出不同的密度依赖性作用。 SS，ISS，CHL.A，NH_4-N和Chirominae对鲤鱼密度的响应之间的关系是非线性的，表明鲤鱼在低密度下对这些变量具有强大的影响。相比之下，小龙虾对淹没的大植物具有很大的负面影响，并且这种关系是非线性的。观察到的鲤鱼和小龙虾对这些变量的影响可能是由于生物扰动，排泄和捕食的结合，这表明生态系统工程工程可能已经宣布了其他社区成员的影响。同样，其影响的差异与功能唯一性有关。我们还证明，诸如鲤鱼和小龙虾之类的异国生态系统工程师的引入可能会触发从具有丰富大型植物的透明水状态转变为以浮游植物为主的浑浊状态。我们的结果为放射性鲤鱼和小龙虾的策略提供了重要的影响。尽管尽可能多地消除这些物种是保护和恢复天然生物多样性和生态系统的最佳管理实践，但我们建议它给出了去除小龙虾以保护大型植物的首要任务。

项目成果

期刊论文数量（26）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

達古武沼における植物プランクトンの季節変化と分布特性

龙古沼浮游植物季节变化及分布特征

DOI：
发表时间：
2007
期刊：
陸水学雑誌 68
影响因子：
0
作者：
Jang;M.-H.;Ha,K. and Takamura;N.;高村典子・中川惠・若菜勇・五十嵐聖貴・辻ねむ;五十嵐聖貴・高村典子・中川惠・辻ねむ・若菜勇;針生勤・仲島広嗣・高村典子;高村典子・中川惠・仲島広嗣・若菜勇・伊藤富子・五十嵐聖貴;中川惠・高村典子・金白虎・辻ねむ・五十嵐聖貴・若菜勇
通讯作者：
中川惠・高村典子・金白虎・辻ねむ・五十嵐聖貴・若菜勇

Predicting of invasive crayfish (Pacifastacus leniusculus) in Kusiro Moor marsh (Japan) using classification and regression trees.

使用分类和回归树预测 Kusiro Moor 沼泽（日本）的入侵小龙虾（Pacifastacus leniusculus）。