A quick step into the dory and a careful shifting of weight with binoculars raised and off we go, five lucky Nature Mappers floating the Snake River on a sparkling Sunday morning. We glide swiftly and smoothly under the Wilson Bridge (with the chittering of swallows and clamor of traffic overhead) and emerge, calling out: “Two, no three Ravens!” “16 Tree Swallows, I think? They move fast.” “Look, a Great Blue Heron!” “No, Osprey!” “Both!”
As we flow downstream, we scan the shorelines, water and sky, and settle into intervals of excitement and tranquility. A designated Nature Mapper jots down the tally for common species and takes GPS points for unusual sightings. A morning’s count can include eight Bald Eagles, a moose, numerous Spotted Sandpipers, Common Mergansers, Yellow Warblers, nesting Bank Swallows and a flotilla of American White Pelicans. Or perhaps we spy a marmot family basking on a rock, or a beaver up a backwater.
For seven years, Nature Mappers have been gathering data on wildlife thanks to A.J. DeRosa, owner of Jackson Hole Vintage Adventures. A.J. donates his handcrafted wooden dory and an expert boatman every Sunday morning from May to October. With this opportunity for consistent data collection, Nature Mappers have been able to record trends and shifts in species’ numbers and locations over the summer months (May-October), year to year. We are beginning to discern patterns in species’ migrations, nesting locations, and possibly, with time, impacts of flooding, dike vegetation management and river use.
These results are possible thanks to over four-dozen trained nature mappers and friends participating each year. Ace volunteer Tim Griffith schedules the teams and often adds his expertise on the floats. Since Tim started coordinating the trips with A.J., many species’ sightings have increased significantly. Tim has a fine ear and eye for the birds! Please read Tim’s 2017 Nature Mapping Jackson Hole Snake River Float Trip Annual Report here. It includes a species list and numbers; the special conditions of 2017 during the spring flood and its effect; and the season’s variation in eagle numbers. Be sure to contact Tim if you wish to volunteer on a Snake River Float Trip this summer!