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首页> 外文期刊>Freshwater science >Effects of cattle grazing on Platte River caddisflies (Ironoquiaplattensis) in central Nebraska
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Effects of cattle grazing on Platte River caddisflies (Ironoquiaplattensis) in central Nebraska

机译：放牧对内布拉斯加州中部的普拉特河河豚（Ironoquiaplattensis）的影响

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The Platte River caddisfly (Ironoquia plattensis) is a semiterrestrial limnephilid that inhabits sloughs along the Platte River in central Nebraska (USA). The species was discovered in 1997, and little is known about what controls its limited distribution or threatens its existence. We investigated effects of grazing by cattle (Bos taurus) on caddisfly abundance in a grassland slough. In April 2010, we established exclosures to isolate cattle from areas with caddisflies. We measured aquatic larval densities in April 2010 and 2011. We estimated grazing intensity from the normalized difference vegetation index (NDVI) values extracted from aerial images made in autumn 2010. Grazing intensity varied among plots, but ungrazed plots had more vegetation (higher NDVI values) than grazed plots. In April 2011, larval densities were greater in ungrazed than in grazed plots. Larval densities and NDVI values were strongly positively correlated, a result suggesting that reduction in vegetative cover from grazing was associated with decreased densities of caddisflies. Increased vegetative cover may have provided structure needed for adult courtship and inputs of organic matter to support larval feeding. Repeated, season-long grazing may have long-term negative consequences for the Platte River caddisfly in grassland sloughs when vegetation does not recover and other effects of cattle persist year after year. Resting pastures from grazing to permit vegetation to rebound appears to allow cattle and Platte River caddisflies to coexist in sloughs along the Platte River.
机译：普拉特河河豚（Ironoquia plattensis）是一种半陆栖类嗜生物，生活在美国内布拉斯加州中部普拉特河沿岸的泥沼中。该物种于1997年被发现，对于控制其有限分布或威胁其生存的知之甚少。我们调查了牛（Bos taurus）放牧对草地泥中线虫丰富度的影响。 2010年4月，我们设立了禁酒区，以将牛与带虫的地区隔离开来。我们在2010年4月和2011年测量了水生幼体密度。我们从2010年秋季拍摄的航拍图像中提取的归一化植被指数（NDVI）值估算了放牧强度。放牧强度在各样地之间有所不同，但未湿地样地的植被较多（NDVI值较高） ）比放牧的地块。 2011年4月，未放牧的幼虫密度大于放牧的幼虫密度。幼虫密度与NDVI值呈极强的正相关，结果表明，放牧导致的植物覆盖率降低与was虫的密度降低有关。营养覆盖物的增加可能已提供了成年求爱所需的结构，并提供了有机物质以支持幼体摄食。如果植被无法恢复并且牲畜的年复一年地持续存在，那么反复的，为期一个季度的放牧可能会对草原泥沼中的普拉特河河豚有长期的负面影响。放牧使草场休息以使植被反弹，这似乎使牲畜和普拉特河的河豚在普拉特河沿岸的泥沼中共存。

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