Abstract：
Odonates (dragonflies and damselflies) can indicate the ecological health of aquatic biota within the rich but vulnerable biodiversity of tropical forests. The reaction of odonates to deforestation can be measured by changes in coarse taxonomic ratios. Suborder Zygoptera are thermal conformers susceptible to overheating, having the affinity with shaded, intact sites. Anisoptera have exothermic regulation and better dispersal capacities, suggesting their association with more altered, open environments. Similarly, with an increasing degradation, the proportion of Anisoptera species in assemblages should increase. However, based on the data from different continents, the Zygoptera/Anisoptera ratio may be too simple, strongly biased, and not applicable at the global scale. The main reason is that the most diverse, abundant, and cosmopolitan families, Coenagrionidae (Zygoptera) and Libellulidae (Anisoptera), comprise a great proportion of habitat generalists with high migratory capacity and affinity with open habitats. In this study, we sampled odonates from three bioregions (Indomalaya, Afrotropics, and Neotropics) over the gradient of tropical forest degradation with a comparable sampling effort to assess the suitability of species richness and suborder-based (Zygoptera/Anisoptera) and family-based (Libellulidae/other Anisoptera and Coenagrionidae/other Zygoptera) ratios and their abundance-weighted versions for monitoring tropical forest degradation. Our results show that simple Odonata as well as Zygoptera and Anisoptera richness are poor indicators of the forest biota alteration. Family-level indices weighted by relative abundance, especially those involving Coenagrionidae, were more sensitive to changes in forest conditions compared to suborder-level indices. Collectively, our results suggest that for biomonitoring, where financial resources and time are commonly critical, family-level ratio metrics may be effective tools to indicate even slight alterations of aquatic biota resulting from forest degradation. Although these indices have the potential for broader application, their effectiveness across tropical bioregions warrants further validation.
摘要：
Odonates（蜻蜓和豆娘）可以表明热带森林丰富但脆弱的生物多样性中水生生物群的生态健康。牙齿对森林砍伐的反应可以通过粗分类比率的变化来衡量。亚目子翅目是容易过热的热整合物，具有阴影的亲和力，完好无损的网站。Anisoptera具有放热调节和更好的分散能力，暗示他们与更多改变的联系，开放环境。同样，随着退化的加剧，组合中Anisoptera物种的比例应增加。然而,根据不同大陆的数据，Zygoptera/Anisoptera比率可能太简单了，强烈的偏见，在全球范围内不适用。主要原因是最多样化的，丰富,和世界性的家庭，孔雀科（Zygoptera）和Libellulidae（Anisoptera），包括很大一部分具有高迁徙能力和与开放栖息地的亲和力的栖息地通才。在这项研究中,我们从三个生物区域(Indomalaya，非洲热带,和新热带）在热带森林退化的梯度上进行类似的采样工作，以评估物种丰富度和基于亚序的（Zygoptera/Anisoptera）和基于家庭的（Libellulidae/其他Anisoptera和Coenagrionidae/其他Zygoptera）比率及其丰度加权版本用于监测热带森林退化。我们的结果表明，简单的Odonata以及Zygoptera和Anisoptera丰富度是森林生物群变化的较差指标。按相对丰度加权的家庭水平指数，尤其是那些涉及Coenagrionidae的，与次序级指数相比，对森林条件的变化更敏感。总的来说，我们的结果表明，对于生物监测，在财政资源和时间通常至关重要的地方，家庭水平的比率指标可能是有效的工具，可以指示森林退化导致的水生生物群甚至轻微的变化。尽管这些指数具有更广泛的应用潜力，它们在热带生物区域的有效性值得进一步验证。
