5/4/14 & 5/5/14: This week on "Fieldnotes:" "Of Driftwood and Journeys," by Anna McNairy.
"Driftwood pools - which can account for up to eighty percent of all pools in a stream - are full of food and flow more slowly than the passing current. Cool and dark, these pools allow various types and ages of fish to co-exist in a sheltered spot where predators aren't lurking. Juvenile coho salmon take over the water's surface, while cutthroat trout idle near the bottom and one-year-old steelhead trout stay in the upstream head of the pool."