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  1. Phuchiwan Suriyawong, Elizabeth A. Bergey
    Sains Malaysiana, 2018;47:1379-1386.
    A series of check dams (or small dams in shallow streams) have been placed on many streams throughout Thailand and
    the number of them continue to increase. Check dam construction activities have been emphasized by the government
    and private sector entities over the last decade to prevent severe flood or drought due to changes in rainfall patterns. This
    study evaluated distribution of functional feeding groups (FFG) in a stream with a high density of check dams. Twelve
    sampling sites at three altitudes (500, 900 and 1500 m asl) included undammed and nearby dammed sections (above
    and below check dams) were used. Aquatic insects were collected monthly at each site for a year and categorized into
    FFG. Aquatic insect composition of undammed and above dam sites was different. Abundance within each FFG at above
    dam sites significantly differed from undammed sites. Taxonomic richness at 1500 and 900 m altitudes was decreased
    at above dam sites compared with the corresponding undammed sites, whereas above dam sites of 500 m altitude had
    higher richness than undammed site. High abundance of predators and collector-gatherers associated with reservoirs
    and fine sediment accumulation above dams, where filter-feeders were scarce. Shredder abundance varied among sites
    and was highest where leaf packs were most abundant. Scrapers were least abundant group and inconsistent with the
    dams. Distribution of FFG was similar to changes in other regulated streams. The composition of FFG reflected the
    stream ecosystem conditions through adaptation of communities to stream habitat and food resources, including those
    associated with check dam construction.
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