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<p>The materials used by the case-building caddisfly <i>Glossosoma</i> sp. to build cases remain understudied; however, they have been recognized as an indicator for monitoring the restoration of natural sediment regimes. This study explored the life history of two <i>Glossosoma</i> species in a fifth-order reach of the Tama River. Specifically, this study examines the voltinism–water temperature relationship in <i>Glossosoma</i> spp. across various regions, and particle size distribution of <i>Glossosoma</i> portable cases by each instar. Voltinism analysis revealed that <i>Glossosoma altaicum</i> and <i>Glossosoma ussuricum</i> inhabited the study site with four and three generations per year, respectively. This difference in voltinism may have resulted from the summer diapause of <i>G. ussuricum</i>. The annual accumulated water temperature showed a positive correlation with voltinism of <i>Glossosoma</i> spp., indicating that water temperature could be an important factor in determining voltinism as in other insects. Exploring the particle size distribution of <i>Glossosoma</i> potable cases by larval instar can offer valuable insights into ecosystem management strategies related to sediment regimes in streams and rivers. Since particle size distribution differs among instars, restoring case materials that are size-appropriate for all instar is required in locations where <i>Glossosoma</i> has disappeared because of anthropogenic changes in sediment dynamics. Furthermore, I discuss how this knowledge can be used for ecosystem management of stream and river sediments.</p>

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Life history, voltinism and portable case characteristics of Glossosoma (Trichoptera: Insecta) in the Tama River, Japan

  • 期刊论文

  • 发表日期：

    2025年8月27日

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  • Daisuke Nakano

摘要

The materials used by the case-building caddisfly Glossosoma sp. to build cases remain understudied; however, they have been recognized as an indicator for monitoring the restoration of natural sediment regimes. This study explored the life history of two Glossosoma species in a fifth-order reach of the Tama River. Specifically, this study examines the voltinism–water temperature relationship in Glossosoma spp. across various regions, and particle size distribution of Glossosoma portable cases by each instar. Voltinism analysis revealed that Glossosoma altaicum and Glossosoma ussuricum inhabited the study site with four and three generations per year, respectively. This difference in voltinism may have resulted from the summer diapause of G. ussuricum. The annual accumulated water temperature showed a positive correlation with voltinism of Glossosoma spp., indicating that water temperature could be an important factor in determining voltinism as in other insects. Exploring the particle size distribution of Glossosoma potable cases by larval instar can offer valuable insights into ecosystem management strategies related to sediment regimes in streams and rivers. Since particle size distribution differs among instars, restoring case materials that are size-appropriate for all instar is required in locations where Glossosoma has disappeared because of anthropogenic changes in sediment dynamics. Furthermore, I discuss how this knowledge can be used for ecosystem management of stream and river sediments.