Ecological Archives A019-009-A4

A. H. Fullerton, E. A. Steel, Y. Caras, M. Sheer, P. Olson, and J. Kaje. 2009. Putting watershed restoration in context: alternative future scenarios influence management outcomes. Ecological Applications 19:218–235.

Appendix D. Pathway of the modeled effect of restoration actions on habitat and fish responses. Models are described in Appendix A and Fig. 2.

Restoration Action

Pathway

Outputs affected

Riparian protection

Riparian function scores of selected reaches (highest quality reaches were chosen) were maintained despite potential degrading effects of urbanization. Riparian scores, if at least fair, were used to reduce sediment and hydrologic runoff reaching the stream by nearly 50% via the "sediment input" and "surface runoff" models, which in turn affected inputs used by the "spawning habitat suitability" and "spawning habitat capacity" models.

riparian functions; sediment reaching stream; hydrologic runoff; stream discharge; habitat suitability; spawner capacity

Riparian restoration

Riparian function scores of selected reaches (poorest quality reaches were chosen) were improved by one level. Riparian scores, if at least fair, were used to reduce sediment and hydrologic runoff reaching the stream by nearly 50% via the "sediment input" and "surface runoff" models, which in turn affected inputs used by the "spawning habitat suitability" and "spawning habitat capacity" models.

riparian functions; sediment reaching stream; hydrologic runoff; stream discharge; habitat suitability; spawner capacity

Decommiss-ion roads

Targeted roads (on public lands) were reduced in length by 95%, which reduced the amount of sediment reaching streams by 95% via the "sediment input" model, and the amount of fine sediment deposited in each reach via the "sediment transport" model. The "spawning habitat suitability" and "egg-to-fry survival" models use these sediment estimates as inputs.

sediment reaching stream and fines deposited; bed scour; habitat suitability; egg-to-fry survival

Repair roads

Targeted roads (in private ownership) were reduced in length by 50%, which reduced the amount of sediment reaching streams by 50% via the "sediment input" model, and the amount of fine sediment deposited in each reach via the "sediment transport" model. The "spawning habitat suitability" and "egg-to-fry survival" models use these sediment estimates as inputs.

sediment reaching stream and fines deposited; bed scour; habitat suitability; egg-to-fry survival

Instream restoration

Estimates produced by the "spawning habitat capacity" model were increased to the 90th percentile for these reaches.

Chinook spawner capacity

Floodplain restoration

Total length of restored reaches increased by 40% (based on historical aerial photos) to account for re-connected or re-created off-channel habitat.

accessible habitat; Chinook spawner capacity

Barrier removal

Historically accessible reaches above the removed barrier were re-coded as accessible for each species; newly available habitat was included in "spawning habitat capacity" calculations.

accessible habitat; Chinook spawner capacity



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