Other species distribution models
Suitable crayfish habitat in the western United States predicted for combinations of background points (50, 300, and 1000) and pilose crayfish occurrence records (P. connectens individually, P. gambelii individually, and both pilose crayfish species combined). These predictions were developed from boosted regression tree models using historical crayfish occurrence records and the EarthEnv habitat layers (Domisch et al., 2015). Our chosen model for main text analyses (1000 background points, both pilose crayfish species combined) is outlined in bold.
Historical occurrences table
Table of historical Pacifastacus connectens and Pacifastacus gambelii occurrence records (N=63) from various sources. Site number corresponds to our sampling sites in APPENDIX G; those without site numbers were not sampled. Year collected is given when known. Additional information regarding source is given in footnotes.
Histograms showing number of true positives, true negatives, false positives, and false negatives for models with varying number of background points included (50, 300, and 1000) and pilose crayfish species included (Pacifastacus connectens, Pacifastacus gambelii, and pilose crayfish species combined). We chose to combine the individual models for P. connectens and P. gambelii here to simplify or standardize comparison to the single model of both pilose crayfishes together; if either individual P. connectens or P. gambelii predicted a location as suitable for one crayfish we accepted it as suitable for either, with absences locations where neither model predicted habitat as suitable for these crayfishes.
Sampling method histograms
Frequency (number of sites) of crayfish catch-per-unit efforts (CPUE) for both timed searching and baited trapping across crayfish species sampled in this study.
Field sampling results table
Table of field sampling results in the western U.S. in the summers of 2016 and 2017, in order of date sampled. We provide latitudes and longitudes in North American Datum 1983 (NAD 83), whether the site was sampled using baited trapping or timed search, whether the site was lentic or lotic, crayfish species detected, and whether the site had a historical species record. Crayfish species detected include Pacifastacus connectens (N=10), Pacifastacus gambelii (N=10), Faxonius virilis (N=22), and Pacifastacus leniusculus (N=29).