The islands and associated back channels on the Ohio River, USA, are believed to provide critical habitat features for several wildlife species. However, few studies have quantitatively evaluated habitat quality in these areas. Our main objective was to evaluate the habitat quality of back and main channel areas for several species using habitat suitability index (HSI) models. To test the effectiveness of these models, we attempted to relate HSI scores and the variables measured for each model with measures of re lative abundance for the model sp ecies. The mean belted kingfisher ( Ceryle alcyon ) HSI was greater on the main than back channel. However, the model failed to predict kingfisher abundance. The mean reproduction component of the great blue heron ( Ardea herodias ) HSI, total common muskrat ( Ondatra zibethicus ) HSI, winter cover component of the snapping turtle ( Chelydra serpentina ) HSI, and brood-rearing component of the wood duck ( Aix sponsa ) HSI were all greater on the back than main channel, and were positively related with the relative abundance of each species. We found that island back channels provide characteristics not found elsewhere on the Ohio River and warrant conservation as important riparian wildlife habitat. The effectiveness of using HSI models to predict species abundance on the river was mixed. Modifications to several of the models are needed to improve their use on the Ohio River and, likely, other large rivers.
KeywordsHabitat Suitability IndexIsland Back ChannelModel ValidationOhio RiverRiparian Wildlife
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