Semiaquatic spiders Alopecosa cinnameopilosa rely on prey derived from macrophyte‐based food web: evidence from Lake Izunuma, Japan
Semiaquatic spiders Alopecosa cinnameopilosa rely on prey derived from macrophyte‐based food web: evidence from Lake Izunuma, Japan
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半水生蜘蛛 Alopecosa cinnameopilosa 依赖来自大型植物食物网的猎物：来自日本伊豆沼湖的证据
DOI：
10.1007/s11273-021-09797-6
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发表时间：
2021
影响因子：
1.8
通讯作者：
Kikuchi Eisuke
中科院分区：
文献类型：
--
作者：
Yasuno Natsuru;Shimada Tetsuo;Fujimoto Yasufumi;Shikano Shuichi;Kikuchi Eisuke
尽管湖泊食物网已被广泛研究，但对浮叶植物形成的食物网知之甚少。近年来，常见于浅水区的荷花迅速扩张，覆盖了日本伊豆沼富营养化浅湖的很大一部分水面。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生蜘蛛 Alopecosacinnameopilosa 的饮食。我们将蜘蛛的潜在饮食分类为水生猎物（水生昆虫和小鱼）、陆生昆虫或主要以浮叶植物为食的半水生叶甲虫（Donacia provostii 和 Galerucella nipponensis）。在莲花植被中，A.cinnameopilosa 主要以叶甲虫为食（平均膳食贡献：7 月为 57.3%，9 月为 46.0%）。湖岸地区，7月肉桂粉蠹同时以叶甲（41.0%）和水生猎物（36.4%）为食，而9月主要以水生猎物（83.1%）为食。地点之间饮食的差异可以反映地点之间叶甲虫丰度的差异。因此，以莲花或菱角为基础的大型植物食物网可以显着支持伊豆沼湖大型植物植被上的半水生蜘蛛。
Although lacustrine food webs have been extensively studied, food webs formed on floating-leaved macrophytes are poorly understood. In recent years, lotusNelumbo 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 spiderAlopecosacinnameopilosacollected 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 provostiiandGalerucella nipponensis) that forage mainly on floating-leaved macrophytes. In lotus vegetation,A.cinnameopilosarelied mostly on leaf beetles (mean dietary contribution: 57.3% in July and 46.0% in September). On the lake shore,A.cinnameopilosarelied 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.