Postdispersal Weed Seed Predation by Crickets in a Rice Paddy Field after Irrigation Water Recedes
Postdispersal Weed Seed Predation by Crickets in a Rice Paddy Field after Irrigation Water Recedes
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灌溉水退去后稻田中蟋蟀传播后杂草种子的捕食
DOI：
10.6090/jarq.48.63
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发表时间：
2014
影响因子：
0.4
通讯作者：
H. Sawada
中科院分区：
文献类型：
--
作者：
Minoru Ichihara;H. Inagaki;K. Matsuno;Chieko Saiki;Shunsuke Mizumoto;Shoukichi Yamaguchi;M. Yamashita;H. Sawada
研究了灌溉水退去后，蟋蟀对杂草种子的捕食作用与稻田边缘距离的关系。2011年9月，在距稻田边缘0、5、10和15m的水田和水田堤坝上，两次调查了蟋蟀和无脊椎动物种子捕食的活动密度。田间所有种类蟋蟀的活动密度分别为2.8-4.6只/捕获器/天(第一次试验)和2.4-6.0只/捕获器/天(第二次试验)，两种蟋蟀在距离场地边缘的距离上的活动密度没有显著差异。然而，不同种类的蟋蟀在空间分布上存在差异。在距场缘5m处，网纹夜蛾的活动密度最大，而在距场缘15m处，网纹夜蛾的活动密度最大。而稻堤上包括野油菜在内的Loxoblemmus spp.的活动密度高于田间。无脊椎动物种子对无脊椎动物种子的捕食比例。高粱(23.9-40.9%/天)和多花黑麦草(81.0-98.8%/天)在距离田间边缘的距离上没有显著差异。摄像机记录显示，蟋蟀是主要的无脊椎动物种子捕食者。这些结果表明，蟋蟀可以帮助耗尽大部分稻田的杂草种子库。
In this study, the relationship between the predation of weed seed by crickets and the distance from the edge of paddy fields after the irrigation water receded was investigated. In September 2011, the activity density of crickets and invertebrate seed predation were investigated twice in a paddy field at distances of 0, 5, 10, and 15 m from the field edge, and on a paddy levee. The activity density of all cricket species in the field was 2.8–4.6 individuals/trap/day (first trial) and 2.4–6.0 individuals/trap/ day (second trial), with no significant difference in activity density between the examined distances from the field edge. However, the cricket species differed in their spatial distribution. The activity density of Teleogryllus emma peaked at 5 m from the field edge, whereas that of Velarifictorus micado peaked 15 m from the edge. In contrast, the activity density of Loxoblemmus spp., including L. campestris, was higher on the paddy levee than in the field. The proportion of invertebrate seed predation on Echinochloa crus-galli var. crus-galli (23.9–40.9%/day) and Lolium multiflorum (81.0– 98.8%/day) did not differ significantly between the examined distances from the field edge. Camera recordings showed crickets to be the predominant invertebrate seed predators. These results suggest that crickets can help deplete weed seed banks over a large portion of paddy fields.