広島大学総合博物館研究報告 Issue 13
published_at 2021-12-25

東広島市におけるコガタノゲンゴロウ Cybister tripunctatus lateralis(Fabricius, 1798)の飛来地と定着に関する一考察

A consideration on the landing site and settlement of Cybister tripunctatus lateralis (Fabricius, 1798) in Higashi-Hiroshima City
NANBA Renshiro
SHIMIZU Yuki
TANI Shotaro
fulltext
3.88 MB
BullHiroshimaUnivMuseum_13_117.pdf
Abstract
2019年,東広島市福富町久芳の水田裏の湿地にて,著者の一人が他種のゲンゴロウ類とともにコガタノゲンゴロウCybister tripunctatus lateralis (Fabricius, 1798)の雌1個体を採集した。これは東広島市での本種の公的な2回目の採集記録となる。本種は平地から低山地の水生植物が豊かな池沼や放棄水田などに生息する比較的大型の水生甲虫である。1950年頃まで各地で記録があり,東広島市においても,1919年11月9日に黒瀬町にて1個体の採集記録がある(亀山・杉森,2020)が,以降激減した。しかし,近年は西日本を中心に全国各地で確認例が増加しており,本報告以外にも東広島市内における捕獲例が相次いでいることから,全国と同様に同市での本種の分布拡大・個体数回復の傾向が示唆される。今後,東広島市の湿地帯における本種の継続的な確認が期待される。
Abstract
In 2019, one of the authors collected one female Cybister tripunctatus lateralis (Fabricius, 1798) along with other species of diving beetles in a wetland behind a paddy field in Fukutomi Town, Higashi-Hiroshima City. This is the second record of this species in this city. It is a relatively large aquatic beetle that inhabits ponds and has abandoned paddy fields rich in aquatic plants, from flatlands to low mountains. It was recorded in various places until around 1950, with one record of the species in Kurosechootada, Higashi-Hiroshima City on November 9, 1919 (Kameyama and Sugimori, 2020), but has decreased sharply since then. However, in recent years, sightings have increased all over the country, mainly in western Japan, and since there are a series of sightings in Higashi-Hiroshima other than this report, it is suggested that the population of this species is recovering and the distribution is expanding in Higashi-Hiroshima, similar to the other parts of the country. In the future, continuous sightings of this species in the wetlands of Higashi-Hiroshima City are expected.
Keywords
コガタノゲンゴロウ
東広島市
RDB
個体数の増加
湿地帯
Cybister tripunctatus lateralis
Higashi-Hiroshima City
Population increase
wetlands
Rights
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