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首页> 外文期刊>Freshwater science >Strong recovery of dragonflies in recent decades in The Netherlands
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Strong recovery of dragonflies in recent decades in The Netherlands

机译：荷兰近几十年来蜻蜓的强劲复苏

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Many dragonfly species in The Netherlands declined in the 20th century because of acidification, eutrophication, and desiccation of lotic and lentic habitats and canalization of streams and rivers. These pressures peaked in the 1970s, when 26 of 65 native species had an unfavorable conservation status on the 1997 Dutch Red List. Since the 1980s, environmental regulations have led to improved water quality, and many habitat restoration projects have been carried out. We used standardized monitoring data (1999-2013) and unstandardized observations (1991-2013) to investigate how dragonflies have changed in the last 20 y on a national scale. We compared trends of dragonfly species from different habitat types and with southern vs northern distribution in Europe. Dragonflies recovered strongly in The Netherlands in a period of similar to 20 y, probably because of recent habitat improvements. Lotic species have benefitted more than lentic species, and southern species have more positive trends than northern species, suggesting that climate change has contributed to the recovery. Dragonflies were resilient and able to quickly recover when their habitats were restored. Recovery has led to a better conservation status for many species. Unstandardized data delivered results consistent with those from monitoring data and had greater statistical power to detect trends because many more unstandardized data than standardized data were available. Thus, when the goal is to provide a general overview of changes in dragonflies, unstandardized data can outperform standardized abundance data. However, abundance data may deliver complementary information for individual species. Our results support the suitability of dragonflies as indicators of freshwater habitat condition, but they recover more strongly in The Netherlands than many other insects, possibly because of their higher dispersal abilities or different habitat requirements.
机译：荷兰的许多蜻蜓物种在20世纪都由于酸性，富营养化以及抽水和豆荚生境的干燥以及河流和河流的渠化而减少。这些压力在1970年代达到顶峰，当时65种本地物种中的26种在1997年荷兰红色名录上的保护状况不佳。自1980年代以来，环境法规导致水质得到改善，并且开展了许多栖息地恢复项目。我们使用标准化的监测数据（1999-2013年）和非标准化的观测值（1991-2013年）调查了全国范围内过去20年中蜻蜓的变化情况。我们比较了来自不同栖息地类型以及欧洲南部和北部分布的蜻蜓物种的趋势。在近20年的时间里，蜻蜓在荷兰恢复了强劲的生命力，这可能是由于最近栖息地的改善。扁豆物种比扁豆物种受益更多，南部物种比北部物种更具积极趋势，这表明气候变化为恢复做出了贡献。蜻蜓具有复原力，能够在栖息地恢复后迅速恢复。恢复使许多物种的保护状况得到改善。非标准化数据提供的结果与监视数据一致，并且具有更大的统计能力来检测趋势，因为可获得的非标准化数据比标准化数据多。因此，当目标是提供蜻蜓变化的一般概述时，未标准化的数据可能会胜过标准化的丰度数据。但是，丰度数据可能会为单个物种提供补充信息。我们的结果支持蜻蜓作为淡水栖息地状况指标的适用性，但它们在荷兰的恢复能力比其他许多昆虫都强，这可能是因为它们具有较高的分散能力或不同的栖息地要求。

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