Delineation of habitat structure in rivers using a high precision gps for conservation of species diversity of invertebrate communities

Shinji Takahashi, Kozo Watanabe, Yasuhiro Takemon, Tatsuo Omura

Research output: Contribution to journalArticlepeer-review

Abstract

Spatial structures of 7 types of aquatic habitat at the reach scale were delineated using a high precision Global Position System (GPS) in 3 dam-impacted and 6 reference riverrine reaches in Miyagi Prefecture, Japan. Taxonomic and functional compositions of quantitative benthic invertebrate samples were also investigated. Out of the three dams, two indicated decreased levels of habitat diversity indexes (S, H', a, and E) at the outlet reaches due to reduced sediment supply and reduced hydraulic variation through dam-operation; but one dam connected to meandering outlet reach did not. Percentage of total area of lentic habitats (i. e., backwater and isolated pool) at the dam-impacted reaches (mean= 1.5%) was significantly lower than reference reaches (mean=5.5%). The taxon richness, abundance of swimmers, predators, attachers and crawlers increased with the percentage of lentic habitat area (P<0.05, n=9), which suggests that lentic habitats contribute to maintain species diversity and the functional groups at the reach scale. Our data indicated a high application potential of the GPS-based evaluation of habitat structure for biodiversity conservation in rivers.

Original languageEnglish
Pages (from-to)121-130
Number of pages10
JournalEcology and Civil Engineering
Volume15
Issue number1
DOIs
Publication statusPublished - 2012

Keywords

  • Benthic invertebrates
  • Biodiversity
  • Global positioning system (gps)
  • Habitat heterogeneity
  • Lentic habitat

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Ecology

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