Oviposition site selection of dragonflies and larval community dynamics in agricultural landscape

今天，水生生境受到特别的威胁。蜻蜓是各种评估和监测的宝贵工具，如生物多样性的衡量、水体健康或完整性的评估。然而，它是不为人知的机制和健身结果产卵地点（=幼虫栖息地）的选择。本研究以行为学、生态学、电生理学及视色素分析等方法，探讨蜻蜓科与蜻蜓亚科的产卵地点选择。结果表明，丽金龟科昆虫对可见产卵地的选择主要是基于日光环境和雄虫的性色素。从视觉色素分析中我们还发现性别辨别能力随年龄的增长而变化。在Sympetrinae，视觉检测浅水池被认为是一个重要的线索产卵地点的选择。系统性杀虫剂和捕食较大的幼虫被认为是代理商，以增加幼虫死亡率的Sympetrum物种。

Aquatic habitats are under particular threat today. Dragonflies constitute a valuable tool for various types of assessment and monitoring, such as the measure of biodiversity, the appraisal of water-body health or integrity. However, it is not well known about mechanisms and fitness consequences of oviposition site (=larval habitats) selection. We conducted behavioral, ecological, electrophysiological, and visual pigment analytical studies on the oviposition site selection of dragonflies (Calopterygidae and Sympetrinae). We found that visible oviposition site selection by Calopterygidae was based on solar light environment and male's sexual pigmentation. We also found that sexual discrimination ability changed with age from the visual pigment analysis. In Sympetrinae, visual detection of shallow water pools was suggested to be an important cue for oviposition site selection. Systemic insecticides and predation by larger dragonfly larvae were suggested to be agents to increase larval mortality of Sympetrum species.