Abstract
Sympetrum pedemontanum (Müller in Allioni) (Odonata: Libellulidae), which is distributed widely in the Eurasian continent and its neighboring islands, is listed as a Least Concern species in the International Union for Conservation of Nature Red List (2015). In Japan, however, the population of its subspecies S. pedemontanum elatum (Selys) has been rapidly decreasing since the 1970s. In order to conserve this subspecies, it is important to understand the seasonal microhabitat use by its larvae. However, this has been a difficult task because larvae of S. pedemontanum elatum often coexist with those of a common congener, S. eroticum (Selys), and cannot be morphologically distinguished from the latter. Thus, in this study, we first established a molecular technique based on the polymerase chain reaction to accurately identify each species. In the subsequent field survey in 2015 with its application in the Sakasegawa River, Hyogo Prefecture, we found that S. pedemontanum elatum larvae hatch in stagnant water and subsequently advance into weakly flowing water. Our results indicated a change in the microhabitats during the larval developmental process, reflecting the need for a continuous spectrum of stagnant, transitional, and flowing water. Such aquatic environments with a spectrum of water conditions are disappearing in Satoyama, a rural farming area in Japan. This has endangered species such as S. pedemontanum elatum and Oryzias latipes (Beloniformes: Adrianichthyidae) by depriving them of their favorable habitats. For their conservation, it is necessary to develop methods to recover the traditional aquatic environments in Satoyama.
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Acknowledgments
We thank Masato Ito for his assistance with collecting some of the Sympetrum species, and M. Takeda and K. Sakamoto (Kobe University) for permission to use their laboratory. We also thank Masaru Higashikawa, a member of the Water Administration Division of Takarazuka City, who collaborated with our investigation at the Sakasegawa River. This research was supported in part by JSPS KAKENHI Grant Number 25292034 to KM.
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Higashikawa, W., Yoshimura, M., Yagi, T. et al. Microhabitat use by larvae of the endangered dragonfly Sympetrum pedemontanum elatum (Selys) in Japan. J Insect Conserv 20, 407–416 (2016). https://doi.org/10.1007/s10841-016-9874-x
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DOI: https://doi.org/10.1007/s10841-016-9874-x