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Bull Trout
The empirical bull trout model is taken from a modeling study which was completed using data from 112 1st – 4th order streams in the Upper Bitterroot River, Montana (Rich et al., 2003). No sampling occurred: 1) where the stream gradient was greater than 20%; 2) above barriers > 2 m such as falls; 3) where stream width was greater than 7 m due to problems with sampling logistics; 4) where contributing area > 130 km2; 5) at elevations lower than 1340 m or higher than 1945; or 6) at channel gradients higher than 15.6% (Rich et al., 2003). Presence/absence of bull trout was measured using electro-fishing and all sampling was completed within a five-year time period. Predictor variables of from local habitat, watersheds scale characteristics, and biotic factors were tested during model development to generate the final model to address the diversity of habitat needs and size. The model calculates the probability of bull trout presence using a logistic regression with parameters: wetted stream width, reach gradient, large woody debris (LWD), basin area, average channel slope, elevation, main stem abundance of bull trout, and the presence or absence of brook trout. Values range from 0 to 1, with higher values equalling better habitat potential. See more.
