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Relations of Lentic Habitat Conditions and Abundance of Bitterling and Mussels to Reach Scale Channel Configuration in the Kizu River

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The Kizu River, a branch of the Yodo River in the middle Japan, had experienced riverbed degradation and vegetation expansion in response to peak-cut in discharge and reduction in sediment dynamism after sand excavation and dam construction in these 60 years. This paper described relations among abundance of fish and mussel communities, habitat structures and reach-scale channel configuration (RSCC) to link between micro habitat scales and reach scales with temporal approach. As for relations between present species and past habitat conditions, bitterling was best explained by a model one year ago, and mussel was best explained by a model consist of flooding frequency and depth of mud two years ago. According to relations between species and habitat conditions in same year, terrace ponds having flood frequency between 8 and 22 days/ year were the most values for bitterlings and mussels. Concave floodplain with shape index between -0.25 and -0.05 tended to have high number of habitats having frequency between 8 and 22 days/year, and Kizu River in 2000s seemed to have higher potential habitat suitability of bitterling and mussel than before.

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