<b>Science and logic</b>
EDITOR: George A. Hollister ("Vacation from logic," Sept. 15) presented significant insight regarding "logic" and coho salmon decline. Cumulative impacts, primarily human-caused since the 1850s, have pushed coho salmon to extirpation in the Russian River and beyond. Regrettably, 30 years ago, agencies removed naturally recruited logs (wood) from streams with unintended consequences. The addition of wood is vital to the ecological health of streams; this is based on scientific research, common sense and logic. The following are created by log structures in streams:
Refuge during high winter flows.
Pools for juvenile fish during the heat and low flows of summer.
Feeding opportunities by trapping organic matter for the aquatic food web.
Channel shaping and stabilization.
Enhanced stream function.
Collection and sorting of gravel and cobble for spawning.
The California Department of Fish and Wildlife, NOAA Fisheries and local organizations have escalated the installation of wood for fish habitat, a high priority for salmon and steelhead recovery.