In 2017, we investigated the population dynamics and flying activity of the south-east European endemic dragonfly species Cordulegaster heros Theischinger, 1979. This research was conducted in the southern part of Central Slovakia in the Revúcka vrchovina Upland at a submountainous stream called Drienok. The mark-release-recapture method was applied to study the population. Cordulegaster heros was observed 775 times during the midsummer season. We found out that the species has bimodal diurnal activity pattern with a highest peak from 17:00 until 19:00 hours, but the species had a short peak before noon as well. The differences between sexes in the sense of entering new individuals to the population were low during the main flying period. Estimated population size for males surpassed the population size of females. Probability of capture decreased by the end of the flying season without differences in sexes. This article is the first on the flying activity and population dynamics of Cordulegaster heros.

中文翻译：

---

Cordulegaster 英雄 Theischinger，1979 年（昆虫纲：Odonata：Cordulegastridae）在斯洛伐克的飞行活动和种群动态

2017 年，我们调查了东南欧特有蜻蜓物种 Cordulegaster heros Theischinger 的种群动态和飞行活动，1979 年。这项研究是在斯洛伐克中部南部 Revúcka vrchovina 高地的一条名为 Drienok 的山下溪流中进行的。应用标记-释放-重新捕获方法对种群进行研究。Cordulegaster 英雄在仲夏季节被观察到 775 次。我们发现该物种具有双峰昼夜活动模式，最高峰值为17:00-19:00，但该物种在中午之前也有一个短暂的峰值。在主要飞行时期，从新个体进入种群的意义上说，两性之间的差异很小。估计男性的人口规模超过女性的人口规模。捕获的概率在飞行季节结束时下降，没有性别差异。本文是关于 Cordulegaster 英雄的飞行活动和人口动态的第一篇文章。