These GIS data are intended to assist users in understanding general patterns in bull trout distributions and inferring potential alteration of these distributions with changes in future mean annual air temperatures. The data have been developed specifically for bull trout and are not intended for use with other aquatic organisms unless similar linkages with air temperatures can be established. The data are most appropriate for broad scale displays and inference (i.e., map scales ~ 1:1,000,000) and should not be applied at finer scales, where local conditions may cause significant deviations from model predictions. The lower limit bull trout model predicts accurately (R2 = 0.74) across the Columbia River basin, but has a RMSE of 180 m (RMSE = average elevation difference between observed values and model predictions). This amount of error would easily obscure meaningful inference when applied to an individual stream.
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