Towards the use of National Census on River Environments data for conservation: issues and a case study

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  • Sueyoshi Masanao
    Graduate School of Agriculture, Hokkaido University
  • Akasaka Takumi
    Laboratory of Conservation Ecology, Obihiro University of Agriculture and Veterinary Medicine
  • Mori Terutaka
    Department of General Systems Studies, University of Tokyo
  • Ishiyama Nobuo
    Graduate School of Agriculture, Hokkaido University
  • Kawamoto Tomoaki
    Fishery Research Laboratory, Kyushu University
  • Takegawa Yuya
    Graduate School of Advanced Technology and Science, Tokushima University
  • Inoue Mikio
    Graduate School of Science and Engineering, Ehime University
  • Mitsuhashi Hiromune
    Institute of Natural and Environmental Sciences, University of Hyogo The Museum of Nature and Human activities, Hyogo
  • Kawaguchi Yoichi
    Graduate School of Science and Technology, Tokushima University
  • Onikura Norio
    Fishery Research Laboratory, Kyushu University
  • Miyake Yo
    Graduate School of Science and Engineering, Ehime University
  • Katano Izumi
    Department of Chemistry, Biology, and Environmental Science Faculty of Science, Nara Women’s University
  • Nakamura Futoshi
    Graduate School of Agriculture, Hokkaido University

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Other Title
  • 河川水辺の国勢調査を保全に活かす―データがもつ課題と研究例
  • カセン ミズベ ノ コクセイ チョウサ オ ホゼン ニ イカス : データ ガ モツ カダイ ト ケンキュウレイ

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With rapid declines in global riverine biodiversity, conservation is needed on a nationwide scale. Since 1990, the National Census on River Environments (NCRE) has collected meaningful data on riverine organisms and environments in Japan. However, there are several issues with using the NCRE database for scientific studies. In this study, we summarised issues related to the NCRE database, and used the 3rd NCRE dataset (2001-2005) to evaluate nationwide trends in species richness and the rarity of fishes (primarily freshwater and diadromous fishes) and taxon richness and the rarity of benthic animals (aquatic insects and shellfishes). First, we summarised data quality (e.g. monitoring sites and season) and data formatting issues (e.g. site name and species name). Second, we mitigated these potential issues as thoroughly as possible and tested the relationships of species (or taxon) richness and rarity with latitude using generalised linear models. We found that species and taxon richness showed different latitudinal distributions between primarily freshwater and diadromous fishes and between aquatic insects and shellfishes. In contrast, rarities showed spatial congruence with species diversity, suggesting that more species and rare species could be conserved in the same regions.

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