Foodweb structure in an agricultural drainage channel through an urbanized zone in Japan, Paddy and Water Environment
Foodweb structure in an agricultural drainage channel through an urbanized zone in Japan, Paddy and Water Environment
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日本城市化地区农业排水沟的食物网结构、稻田和水环境
DOI：
10.1007/s10333-013-0365-3
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发表时间：
2014
影响因子：
2.2
通讯作者：
Takeo Onishi
中科院分区：
文献类型：
--
作者：
Ken HIRAMATSU;Koyo Yonebayashi;Eiji Ichion;Shinichi Nishimura;Takeo Onishi
流经城市化地区的渠道和溪流经常通过在河床上铺上混凝土来进行改造，以防止集水区土地使用变化造成的洪水。即使在改造中纳入生态友好工程，如鱼塘和鱼类栖息地区块，以适应水生生态系统，也会对食物网产生影响，从而影响鱼类的食物量。在这项研究中，食物网结构的大江排水道，一个小的混凝土衬砌流通过城市地区，使用稳定的碳和氮同位素比值进行了研究。我们比较了大江水道与其他几个水生系统的特征。我们发现了一个单一的营养转移线，从颗粒有机物（POM）的底栖鱼类（Rhinogobiussp.）和甲壳类（Palaemon paucidens）通过游鱼（Squalidus chankaensi和麦穗鱼）。parva）。然而，最高的营养级（底栖鱼类）只有2.6-2.8，因为很少有浮游节肢动物出现在POM和鱼类之间的网络，不像在更自然的水体。此外，无论是陆生植物还是附着生物都不是POM的主要来源。相反，从生活污水中的有机物似乎是POM在大江通道的主要来源。因此，这条流经城市化地区的混凝土河流的食物网结构被证明受到其非自然环境的强烈影响，并且极易受到这些环境变化的影响。
Channels and streams flowing through urbanized areas are often modified by lining the channel bed with concrete to prevent flooding caused by land-use changes in the catchment area. Even when eco-friendly works, such as fish pools and fish habitat blocks, are incorporated into the modification to accommodate aquatic ecosystems, there will be impacts on the food web and, consequently, the amount of food available for fish. In this study, the food web structure of the Ooe drainage channel, a small concrete-lined stream through an urban area, was investigated using stable isotope ratios of carbon and nitrogen. We compared the characteristics of the Ooe channel to those of several other aquatic systems. We found a single trophic transfer line, from particulate organic matter (POM) to benthic fish (Rhinogobiussp.) and crustaceans (Palaemon paucidens) via swimming fish (Squalidus chankaensisandPseudorasbora. parva). However, the highest trophic level (benthic fish) was only 2.6–2.8 because few planktonic arthropods occurred in the web between POM and fish, unlike in more natural bodies of water. In addition, neither terrestrial plants nor periphyton were major sources of POM. Instead, organic matter from domestic wastewater appeared to be the major source of POM in the Ooe channel. Thus, the food web structure of this concrete-lined stream flowing through an urbanized zone proved to be strongly affected by its non-natural surroundings and extremely vulnerable to changes in those surroundings.