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

水生栖息地今天尤其受到威胁。蜻蜓是各种评估和监测的宝贵工具，如测量生物多样性、评价水体健康或完整性。然而，关于产卵地点选择的机制和适应性结果尚不清楚。我们对蜻蜓（黄翅科和同翅科）的产卵地点选择进行了行为学、生态学、电生理和视觉色素分析研究。结果表明，黄蝶的产卵地点选择主要基于光照环境和雄性的性色素。我们还从视觉色素分析中发现，性别辨别能力随年龄的变化而变化。在同盆蚊中，浅水池的视觉检测被认为是产卵地点选择的重要线索。系统杀虫剂和大蜻蜓幼虫的捕食是提高双翅虫幼虫死亡率的主要因素。

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.