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<p>Information on the life cycle and spatio-temporal dynamics of an individual invertebrate species is essential for understanding the structure and functions of stream ecosystems. <i>Limnocentropus insolitus</i> is a unique caddisfly species, the larvae of which bear a case with a characteristic silken stalk adhered to substratum, float in the water column, and capture drifting insects and other organic materials in mountainous streams. We clarified the life cycle, larval microdistribution, seasonal changes in larval density, and temporal patterns in drift propensity for this species. The studied population of <i>L</i>. <i>insolitus</i> was univoltine; larvae hatched in early summer, and adults emerged in late spring. Mean larval density was higher in emerged boulders that partially protruded from the water surface than in other microhabitat types when precipitation and discharge were high. The emerged boulders may provide the most suitable microhabitat during high-flow events. The larvae drifted actively and often exhibited diurnal peaks in the drift, possibly to minimizing predation risk from nocturnal fish. The drift propensity increased in summer, when larvae developed rapidly, and may need to address an increasing demand for suitable places to capture prey effectively. Larval density decreased temporally in late summer, coinciding with high discharge. It did not show noticeable changes during winter. Our findings provided some insight into when and where <i>L</i>. <i>insolitus</i> is functionally significant in a stream ecosystem.</p>

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Life cycle, microdistribution, larval dynamics, and drift patterns in a stream caddisfly Limnocentropus insolitus (Trichoptera, Limnocentropodidae)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月27日

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  • Takuto Itakura,
  • Takashi Kagaya,
  • Koichi Tanaka

摘要

Information on the life cycle and spatio-temporal dynamics of an individual invertebrate species is essential for understanding the structure and functions of stream ecosystems. Limnocentropus insolitus is a unique caddisfly species, the larvae of which bear a case with a characteristic silken stalk adhered to substratum, float in the water column, and capture drifting insects and other organic materials in mountainous streams. We clarified the life cycle, larval microdistribution, seasonal changes in larval density, and temporal patterns in drift propensity for this species. The studied population of L. insolitus was univoltine; larvae hatched in early summer, and adults emerged in late spring. Mean larval density was higher in emerged boulders that partially protruded from the water surface than in other microhabitat types when precipitation and discharge were high. The emerged boulders may provide the most suitable microhabitat during high-flow events. The larvae drifted actively and often exhibited diurnal peaks in the drift, possibly to minimizing predation risk from nocturnal fish. The drift propensity increased in summer, when larvae developed rapidly, and may need to address an increasing demand for suitable places to capture prey effectively. Larval density decreased temporally in late summer, coinciding with high discharge. It did not show noticeable changes during winter. Our findings provided some insight into when and where L. insolitus is functionally significant in a stream ecosystem.