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Semiaquatic spiders Alopecosa cinnameopilosa rely on prey derived from macrophyte‐based food web: evidence from Lake Izunuma, Japan
Wetlands Ecology and Management ( IF 1.8 ) Pub Date : 2021-03-30 , DOI: 10.1007/s11273-021-09797-6
Natsuru Yasuno , Tetsuo Shimada , Yasufumi Fujimoto , Shuichi Shikano , Eisuke Kikuchi

Although lacustrine food webs have been extensively studied, food webs formed on floating-leaved macrophytes are poorly understood. In recent years, lotus Nelumbo nucifera, which was often seen in shallow waters, has rapidly expanded and covered a significant part of the surface of the eutrophic shallow Lake Izunuma in Japan. We investigated the diet of the semiaquatic spider Alopecosa cinnameopilosa collected from lotus vegetation and the shore, using carbon and nitrogen stable isotopes. We categorized the spiders’ potential diet as aquatic prey (aquatic insects and small fish), terrestrial insects, or semiaquatic leaf beetles (Donacia provostii and Galerucella nipponensis) that forage mainly on floating-leaved macrophytes. In lotus vegetation, A. cinnameopilosa relied mostly on leaf beetles (mean dietary contribution: 57.3% in July and 46.0% in September). On the lake shore, A. cinnameopilosa relied on both leaf beetles (41.0%) and aquatic prey (36.4%) in July, whereas they relied mostly on aquatic prey (83.1%) in September. The difference in diets between sites could reflect differences between sites in the abundance of leaf beetles. Therefore, macrophyte-based food webs that start from lotus or water chestnuts could significantly support semiaquatic spiders on macrophyte vegetation in Lake Izunuma.



中文翻译:

Semiaquatic蜘蛛斑秃藻(Alopecosa cinnameopilosa)依赖于以大型植物为食的食物网衍生的猎物:来自日本伊豆沼市的证据

尽管已对湖相食物网进行了广泛研究,但对浮叶大型植物上形成的食物网却知之甚少。近年来,经常在浅水区见到的莲NeNelumbo nucifera)迅速扩张并覆盖了日本富营养化浅水泉泉(Izunuma)的很大一部分表面。我们使用碳和氮稳定同位素研究了从莲花植被和海岸采集的半水蜘蛛奇异斑斑拟南藻(Alopecosa  cinnameopilosa)的饮食。我们将蜘蛛的潜在饮食归类为水生猎物(水生昆虫和小鱼),陆生昆虫或半水生叶甲虫(Donacia provostiiGalerucella nipponensis))主要在浮叶大型植物上觅食。在莲花植被,A.  cinnameopilosa主要依赖叶甲虫(平均膳食的贡献:在七月57.3%和46.0%,9月)。在湖岸,七月份的A.  cinnameopilosa既依赖叶甲虫(41.0%),又依赖水生猎物(36.4%),而9月则主要依赖水生猎物(83.1%)。地点之间饮食的差异可能反映了地点之间叶甲虫数量的差异。因此,从荷花或栗子开始的以大型植物为基础的食物网可为伊豆沼湖大型植物植被上的半水蜘蛛提供重要支持。

更新日期:2021-03-30
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