Influence of Environmental Factors and Revetment Methods on Benthic Invertebrate Communities in the Hukara Irrigation Ca L

27 Mar Influence of Environmental Factors and Revetment Methods on Benthic Invertebrate Communities in the Hukara Irrigation Ca L

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Abstract

English Abstract

This study evaluated the influence of environmental factors and four revetment methods, concrete lining, dry masonry, wet masonry and tural mud-wall, on benthic invertebrate communities (BIC) in the Hukara Irrigation Ca l, Shizuoka Prefecture, Japan, in October 1993, and in April and September 1994. The species composition of the BIC was influenced by two environmental factors; the cover degree on the revetments and the size of gravel on the ca l beds, which were regulated by the revetment construction methods. The long revetment section of the concrete lining may have an effect to decrease the diversity of the BIC and the density of benthic individuals, because of a high velocity of the water flow, lack of gravel and poor vegetation cover. From the results, the followings are recommended in construction for increasing the diversity of the BIC; to shorten the distance of the same revetment method, to use tural materials rich in porosity, and to cover the revetment with tural vegetation.