Appendix B. Summary of model selection for analysis of fish growth.

Summary of model selection for analysis of fish growth

The Snohomish River Basin, Washington State (USA), showing the Skykomish River sub-basin, with major and minor river bodies.

<p>BIP was modeled in the entire Snohomish Basin and validated using survey data from the Skykomish sub-basin. Input data to inform model variables was derived from stream segments in the Snohomish watershed, but excluded the Skykomish sub-basin where model validation occurred.</p

Model validation contingency table and supporting test statistics, comparing field-observed BIP with modeled BIP (left), and evaluation of model prediction at sites currently or historically occupied by beavers (center), and actively occupied sites (right).

<p>Model validation contingency table and supporting test statistics, comparing field-observed BIP with modeled BIP (left), and evaluation of model prediction at sites currently or historically occupied by beavers (center), and actively occupied sites (right).</p

BIP model in the Snohomish Basin.

<p>Large, low-gradient rivers and small, high-gradient streams are grouped as having low or no BIP, while small to mediums sized low-gradient streams have moderate or high BIP.</p

Geomorphic characteristics of stream segments in the Snohomish River Basin occupied by beaver.

<p>(A) Valley widths versus slope, (B) valley width v. bankfull width. Crosshair lines represent the standard deviations, and square symbols are the means. Note that the scale is logarithmic. The data show that dam-building beaver generally prefer streams with percent slope < 0.04, bankfull width < 8 m, and valley width > 30 m.</p

Field validation sites in the Skykomish subbasin.

<p>Field validation sites in the Skykomish subbasin.</p

Summary of general and regional beaver habitat suitability models identifying important environmental variables for predicting potential beaver occupation.

<p>Note that some studies focused on specific variable categories (e.g., vegetation) for the purpose of their study objectives.</p

Additive scoring criteria for environmental variables in each stream segment used to categorize the beaver intrinsic potential (BIP) of all 5,182 km of stream segments in the Snohomish River Basin.

<p>Total BIP Score was found by adding the variable scores, Stream Slope + Stream Width + Valley Width (max = 12, min = 0), and adjusted to categories 0–3 for ease of display and analysis.</p

BIP model predictions for beaver habitat intrinsic potential in the Snohomish River Basin, showing number and total length of streams segments by category.

<p>Observed conditions, number of validation sites visited within each modeled BIP class, and beaver presence is described for field-validated sites, which occurred within the Skykomish River subbasin.</p

Appendix B. Comparison of temporal changes in sockeye salmon spawner distributions across years.

Comparison of temporal changes in sockeye salmon spawner distributions across years