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Predicting threatened bull trout occurrence using Ripple, a digital terrain-based modeling program

Predicting threatened bull trout occurrence using Ripple, a digital terrain-based modeling program. Audrey Sawyer. Bull Trout ( Salvelinus confluentus ). Threatened species Pacific Northwest region Resident, migratory, and anadromous forms Habitat needs: Cold Clean Complex Connected.

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Predicting threatened bull trout occurrence using Ripple, a digital terrain-based modeling program

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  1. Predicting threatened bull trout occurrence using Ripple, a digital terrain-based modeling program Audrey Sawyer

  2. Bull Trout (Salvelinus confluentus) • Threatened species • Pacific Northwest region • Resident, migratory, and anadromous forms • Habitat needs: • Cold • Clean • Complex • Connected

  3. Problem Definition The migratory behavior of bull trout is poorly understood. How can we best monitor the habitat and population of this threatened species?

  4. Approach Predict habitat and population for any river network using Ripple.

  5. Future Work • Try better method for estimating channel slope • Fine-tune model parameters to represent bull trout instead of coho salmon (grain size for spawning, ocean survival rate, habitat preference)

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