Benthic communities and genetic structure of caddisfly stenopsyche marmorata along a mountain stream fragmented by slit and unslit sabo dams

K. Nukazawa, S. Kazama, K. Watanabe, J. Kang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In order to assess the impacts of sabo dam (check dam) construction, species diversity of benthic faunal communities and genetic diversity of caddisfly Stenopsyche marmorata were investigated using microsatellite analysis along the Oisawa River, Japan. The Oisawa River is fragmented by two slit sabo dams and one unslit sabo dam. Over the slit dams, Shannon-Weiner diversity indices and number of taxa ranged from 0.90 to 1.02 and 13 to 15 respectively in the upstream region, and also from 0.98 to 1.18 and 13 to 20 respectively in the downstream region. Through microsatellite analysis of S. marmorata, we found two selective alleles, which show clear genetic differentiation among three upstream sites and four downstream sites in the study area. Longitudinal change of mean heterozigosities Ho showed a decreasing pattern of genetic diversity in the downstream site (=0.486 - 0.678), and it showed the highest diversity at the highest upstream site, which receives no effect of the unslit dam. Differences of community's species compositions between sites were correlated to geographical distances whereas genetic distances between sites were not correlated to geographical distances, suggesting that species compositions of the communities were determined through the process of species adaptation to the local environment. We concluded that increments of species diversity at the inlet reaches of the slit dam were caused by the recovery of habitats, and by the continuousness of the stream which allows the flowing of particulate organic matters and sediments to the downstream area. In part of some loci, genetic selection might occur by the different velocities caused by sabo dam constructions, because S marmorata (filter-feeder) has the habit of constructing nets to filter and collect fine particulate organic matter (FPOM) from water flow.

Original languageEnglish
Title of host publicationRiver Basin Management VI
PublisherWITPress
Pages263-274
Number of pages12
Volume146
ISBN (Print)9781845645168
DOIs
Publication statusPublished - 2011
Event6th International Conference on River Basin Management including all aspects of Hydrology, Ecology, Environmental Management, Flood Plains and wetlands, RM 2011 - Riverside, CA, United States
Duration: 2011 May 252011 May 27

Other

Other6th International Conference on River Basin Management including all aspects of Hydrology, Ecology, Environmental Management, Flood Plains and wetlands, RM 2011
CountryUnited States
CityRiverside, CA
Period11/5/2511/5/27

Keywords

  • Check dam
  • Genetic diversity
  • Macroinvertebrate
  • Microsatellite DNA
  • Small scale analysis
  • Species diversity
  • Stenopsyche marmorata

ASJC Scopus subject areas

  • Environmental Science(all)

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