飛騨山脈の高天原および竜晶池で2023年に確認されたトンボ類

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  • Dragonflies and damselflies collected in Takamagahara and Ryûshô-ike, the Hida mountains, Toyama Prefecture, central Japan in 2023

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説明

Dragonfly fauna in Takamagahara and Ryûshô-ike, the Hida Mountains, Toyama Prefecture, central Japan was surveyed in August 2023, and 11 species were confirmed. Of these, Ceriagrion melanurum Selys, 1876, Lyriothemis pachygastra (Selys, 1878), and Orthetrum albistylum (Selys, 1848) were recorded for the first time in the Takamagahara area. Additionally, Sympetrum danae (Sulzer, 1776) was confirmed in Toyama Prefecture for the first time in 22 years. Combining the results of previous study and this survey, 19 species of dragonflies have been confirmed in the Takamagahara area. The dragonfly fauna is well reflected by the fact that it is located at an altitude of about 2,100 m in the Hida Mountains, as both the alpine species of Leucorrhinia dubia (Vander Linden, 1825) and S. danae were confirmed in Honshu. Since Takamagahara and Ryûshô-ike are thought to have been formed by a landslide on the western slope of Mt. Suishô-dake that occurred about 10,000 years ago, this dragonfly fauna is also thought to have been formed over a period of at most 10,000 years, and is not considered a relict from the glacial period. Furthermore, some species such as C. melanurum and L. pachygastra, may have been newly introduced in the past 20 years, suggesting that the dragonfly fauna in this area may be in unexpectedly rapid flux over a short period of time.

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