The digital maps and sample coordinates in the table below are used to guide your eDNA surveys for determining the occurrence of bull trout in spawning and rearing habitats anywhere throughout their historical range in the Northwest. Most of the potential bull trout streams (>5,000) were identified using the Climate Shield habitat occupancy model developed from >4,000 fish surveys in 512 streams (Isaak et al. 2015),but USFWS-designated critical habitats for bull trout spawning and rearing are also shown on the maps. Note that not all stream habitats designated on the maps need to be sampled, so please review the field sampling instructions (“Participating in the
Bull Trout eDNA Survey, important caveats”). To get started, print or plot the map of showing the 8-digit HUC to be sampled and identify which potential bull trout streams are of interest (and can be sampled in their entirety). Files may be periodically updated, so confirm that you have the most current versions before starting field work. Next, download the Excel file with the eDNA sample site coordinates (note that a GPS unit will be required for accurate field navigation). Then plan your field strategy after familiarizing yourself with the eDNA sampling protocol and the additional guidelines for the bull trout eDNA survey project.
Cite as: Young, Michael K.; Isaak, Daniel J.; McKelvey, Kevin S.; Schwartz, Michael K.; Carim, Kellie J.; Fredenberg, W.; Wilcox, Taylor M.; Franklin, T.; Chandler, Gwynne L.; Nagel, David E.; Parkes-Payne, Sharon L.; Horan, Dona L.; Wollrab, Sherry P. 2017. Species occurrence data from the Range-Wide Bull Trout eDNA Project. Fort Collins, CO: Forest Service Research Data Archive. Updated 05 June 2021. https://doi.org/10.2737/RDS-2017-0038