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<p>Benthic macroinvertebrates were collected during April–November in 2018 and 2019 and during January–December in 2023 from the Zensuke Stream (2.78 average pH), a small geothermal stream flowing through a solfatara field of the Tamagawa Hot Spring area, Akita Prefecture, in northern Japan. In total, 10 taxa (seven Diptera, two Plecoptera, and one Trichoptera) were collected from the stream. Among them, <i>Nemoura saetifera</i> Shimizu, 1997 (Nemouridae; Plecoptera) and <i>Eukiefferiella coerulescens</i> (Kieffer, 1926) (Chironomidae; Diptera) dominated the community throughout the seasons, collectively accounting for 93–98% of the average annual total population density. The community was characterized by a high density of these two dominant species and low diversity. Predatory species were rare. Water temperatures in the Zensuke Stream remained below 16&#xa0;°C during the summer–autumn, but rose to exceed 20&#xa0;°C occasionally during the snow accumulation period because of reduced flow and the resultant increased contribution of hot spring water. The stream temperature decreased rapidly in spring because of the inflow of snowmelt water. Such a characteristic stream temperature regime likely influenced macroinvertebrates’ growth and development in the stream, and affected the community dynamics.</p>

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Seasonal dynamics of benthic macroinvertebrate community in a highly acidic geothermal stream of the Tamagawa Hot Spring area, northern Japan

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • Kokichi Aoya,
  • Tomoya Iwata,
  • Satoko Noda,
  • Masahiro Yuki,
  • Daisaku Takahashi,
  • Kazumi Tanida

摘要

Benthic macroinvertebrates were collected during April–November in 2018 and 2019 and during January–December in 2023 from the Zensuke Stream (2.78 average pH), a small geothermal stream flowing through a solfatara field of the Tamagawa Hot Spring area, Akita Prefecture, in northern Japan. In total, 10 taxa (seven Diptera, two Plecoptera, and one Trichoptera) were collected from the stream. Among them, Nemoura saetifera Shimizu, 1997 (Nemouridae; Plecoptera) and Eukiefferiella coerulescens (Kieffer, 1926) (Chironomidae; Diptera) dominated the community throughout the seasons, collectively accounting for 93–98% of the average annual total population density. The community was characterized by a high density of these two dominant species and low diversity. Predatory species were rare. Water temperatures in the Zensuke Stream remained below 16 °C during the summer–autumn, but rose to exceed 20 °C occasionally during the snow accumulation period because of reduced flow and the resultant increased contribution of hot spring water. The stream temperature decreased rapidly in spring because of the inflow of snowmelt water. Such a characteristic stream temperature regime likely influenced macroinvertebrates’ growth and development in the stream, and affected the community dynamics.