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10-Minute Presentation

Systematics, Evolution, and Biodiversity

10-min: SysEB, Biodiversity 1 - Guarding Our Natural Heritage

Freshwater insect abundance trends vary between continents and families

Sunday, November 9, 2025
9:48 AM - 10:00 AM Pacific
Location: Oregon Convention Center, B116, OCC
Oral Presentation

    Presenting Author(s)

  • JM

    John F. Murphy

    Queen Mary University of London
    Wareham, England, United Kingdom

    • Co-Author(s)

  • JJ

    J. Iwan Jones

    Queen Mary University of London
    London, England, United Kingdom

  • ED

    Ellie Dyer

    UK Centre for Ecology and Hydrology
    Wallingford, England, United Kingdom

  • BW

    Ben Woodcock

    UK Centre for Ecology and Hydrology
    Wallingford, England, United Kingdom

  • YP

    Young-Seuk Park

    Kyung Hee University
    Seoul, Seoul-t'ukpyolsi, Republic of Korea

  • SH

    Soon-Jin Hwang

    Konkuk University
    Seoul, Seoul-t'ukpyolsi, Republic of Korea

With concern mounting that insect biodiversity is being harmed by human activities there is an urgent need for robust evidence to support or refute these contentions. In many high-income countries, river insect communities have been regularly sampled for decades for national water quality monitoring purposes. Here, such data, from Europe, North America, Australia and South Korea, have been compiled and analysed to quantify trends in the abundance and prevalence of insect families. Across all time series, there were many more insect families with increasing than decreasing abundance trends; particularly among the Plecoptera, Trichoptera and Diptera. There was not a consistent pattern in trends of abundance across all locations for individual insect families, with different territories potentially being subject to different pressures or at different stages along the environmental degradation/recovery trajectory. Recovery trajectories are evident in Europe and Australia but not so in South Korea or North America. The extent to which intrinsic biological traits can account for variation in trends between taxa is also explored.