Agricultural areas represent one of the major ecosystems of the world. Intensification of agricultural practices produced openfields characterized by low biological diversity. Nevertheless, the distance up to which intensive agricultural fields alter surrounding natural systems is rarely quantified. We determined the spatial scale at which agricultural landscapes alter the diversity of Odonates, a key taxon in wetland ponds, and we tested to what extent citizen science data can be used reliably for this purpose. We compiled 7731 observations made in a portion of the region Centre‐Val‐de‐Loire (France) over 10 years by naturalists on 729 water bodies to analyze the effect of agricultural landscapes (mainly wheat, rapeseed, sunflower) on the species richness of both damselflies and dragonflies in lentic systems. Sixty species were reported over the 10‐year period. For dragonflies, intensive agricultural landscapes best explained their richness at the scales of 800 and 1600 m for overall and autochthonous species, respectively, when using the full dataset. The spatial scale was smaller for damselflies, at 200 m for both overall and autochthonous species. These distances were not severely impacted when constraining the data to consider several biases. Multimodel averaging showed that the proportion of intensive agriculture decreased species richness, despite the potential biases inherent to an imperfect database acquired by citizens. This imperfect citizen dataset allows to infer the lowest effect size of agriculture on species richness. Quantitatively, this effect was more important for autochthonous species. Interestingly, both relatively rare taxa and common or generalist species can be under threat in intensive agricultural landscapes, calling for more ecotoxicological studies. The influence of agricultural practices from a distance implies that conservation and management plans of wetland ponds should consider the landscape ecological characteristics and not only the pond features. Conservation efforts focusing too locally on a site may be undermined because intensive agriculture from a distance limits the potential for the site to recover highly diverse communities. These distant effects should be integrated by policy‐makers when deciding which wetland pond should benefit from a conservation plan or which conservation action may be planned, implementing, for instance, buffer zones and/or ecological corridors composed of natural vegetation.

中文翻译：

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使用公民科学数据检测集约化农业对 Odonata 多样性的影响


农业区是世界主要的生态系统之一。农业实践的集约化产生了以生物多样性低为特征的开阔田地。然而，集约化农业领域改变周围自然系统的距离很少被量化。我们确定了农业景观改变湿地池塘中关键分类群 Odonates 多样性的空间尺度，并测试了公民科学数据在多大程度上可以可靠地用于此目的。我们汇编了博物学家 10 年来在卢瓦尔河谷河谷地区（法国）部分地区对 729 个水体进行的 7731 次观察，以分析农业景观（主要是小麦、油菜籽、向日葵）对 lentic 系统中豆娘和蜻蜓物种丰富度的影响。在 10 年期间报告了 60 个物种。对于蜻蜓来说，当使用完整数据集时，集约化农业景观最好地解释了它们在 800 m 和 1600 m 尺度上的整体物种和 1600 m 物种的丰富性。豆娘的空间尺度较小，整体物种和本地物种均为 200 m。当限制数据以考虑多个偏差时，这些距离没有受到严重影响。多模型平均表明，集约化农业的比例降低了物种丰富度，尽管公民获得的不完美数据库存在潜在的固有偏差。这个不完美的公民数据集允许推断农业对物种丰富度的最低影响大小。从数量上讲，这种影响对本地物种更为重要。 有趣的是，相对稀有的分类群和常见或通用物种在集约化农业景观中都可能受到威胁，因此需要更多的生态毒理学研究。远距离农业实践的影响意味着湿地池塘的养护和管理计划应考虑景观生态特征，而不仅仅是池塘特征。过于注重地点本地的保护工作可能会受到破坏，因为远距离的集约化农业限制了该地点恢复高度多样化的社区的潜力。决策者在决定哪些湿地池塘应从保护计划中受益或可以规划哪些保护行动时，应将这些遥远影响纳入考虑范围，例如实施缓冲区和/或由自然植被组成的生态走廊。