Abstract：
Discerning the impact of anthropogenic impacts requires the implementation of bioindicators that quantify the susceptibilities and vulnerabilities of natural terrestrial and aquatic ecosystems to perturbation and transformation. Although legal regulations in Brazil recognize the value of bioindicators in monitoring water quality, the depreciation of soil conditions has yet to receive adequate attention. Thus, our study aimed to evaluate the potential of odonates (dragonflies and damselflies) as amphibiotic bioindicators to reflect the correlation between the degradation of aquatic and terrestrial habitats in pasture-dominated landscapes. We assessed the relationship between the biotic indices of Odonata and the conservation status of preserved riparian landscapes adjacent to anthropogenically altered pastures in 40 streams in the Brazilian savannah. Our results support the hypothesis that Odonata species composition may be a surrogate indicator for soil and water integrity, making them promising sentinels for detecting environmental degradation and guiding conservation strategies in human-altered landscapes. Importantly, while the Zygoptera/Anisoptera species ratio is a useful bioindicator tool in Brazilian forest, it is less effective in the open savannah here, and so an alternative index is required. Importantly, while the Zygoptera/Anisoptera species ratio is a useful bioindicator tool in Brazilian forest, it is less effective in the open savannah here, and so an alternative index is required. On the other hand, our results showed the Dragonfly Biotic Index to be a suitable tool for assessing freshwater habitats in Brazilian savannah. We also identified certain bioindicator species at both ends of the environment intactness spectrum.
摘要：
识别人为影响的影响需要实施生物指标，以量化自然陆地和水生生态系统对扰动和转化的敏感性和脆弱性。尽管巴西的法律法规承认生物指标在监测水质方面的价值，土壤条件的贬值尚未得到足够的重视。因此，我们的研究旨在评估牙齿动物（蜻蜓和豆娘）作为两栖生物指标的潜力，以反映牧场为主的景观中水生和陆地栖息地退化之间的相关性。我们评估了Odonata的生物指数与巴西大草原40条溪流中与人为改变的牧场相邻的保留河岸景观的保护状况之间的关系。我们的结果支持以下假设：Odonata物种组成可能是土壤和水完整性的替代指标，使它们成为有前途的哨兵，以检测环境退化并指导人类改变的景观中的保护策略。重要的是,虽然Zygoptera/Anisoptera物种比率是巴西森林中有用的生物指示工具，在这里开放的大草原上效果较差，因此需要一个替代索引。重要的是,虽然Zygoptera/Anisoptera物种比率是巴西森林中有用的生物指示工具，在这里开放的大草原上效果较差，因此需要一个替代索引。另一方面,我们的结果表明，蜻蜓生物指数是评估巴西大草原淡水栖息地的合适工具。我们还在环境完整性谱的两端确定了某些生物指示物种。
