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Distribution, habitat associations, and conservation status updates for the pilose crayfish Pacifastacus gambelii and Snake River pilose crayfish Pacifastacus connectens of the western United States

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RT @ERLarsonLab: Congrats to recent lab graduate Rachel Egly on winning Best Poster Presentation in Applied Research at the Society for Fre…
Congrats to recent lab graduate Rachel Egly on winning Best Poster Presentation in Applied Research at the Society for Freshwater Science meeting this past May! Pre-print of Rachel's in-review research here: https://t.co/NBeWk4Qykx https://t.co/W27ERxxO0M
@drkiki Signal crayfish also a big problem for other native crayfish species in western US; attributed as cause of one extinction, one ESA listing, and seem to be impacting eastern Oregon's native pilose crayfish: https://t.co/NBeWk4Qykx
Distribution, habitat associations, and conservation status updates for the pilose crayfish Pacifastacus gambelii and Snake River pilose crayfish Pacifastacus connectens of the western United States https://t.co/GCC3G02FYe
90 days ago
Distribution, habitat associations, and conservation status updates for the pilose crayfish Pacifastacus gambelii and Snake River pilose crayfish Pacifastacus connectens of the western United States https://t.co/LsT8LPC7K2
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Supplemental Information

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.

DOI: 10.7287/peerj.preprints.27001v1/supp-1

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.

DOI: 10.7287/peerj.preprints.27001v1/supp-2

Classification histograms

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.

DOI: 10.7287/peerj.preprints.27001v1/supp-3

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.

DOI: 10.7287/peerj.preprints.27001v1/supp-4

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).

DOI: 10.7287/peerj.preprints.27001v1/supp-5

Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Rachel M Egly conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the paper, approved the final draft.

Eric R Larson conceived and designed the experiments, performed the experiments, contributed reagents/materials/analysis tools, authored or reviewed drafts of the paper, approved the final draft.

Field Study Permissions

The following information was supplied relating to field study approvals (i.e., approving body and any reference numbers):

Crayfish sampling was conducted under permits issued by various agencies including Wyoming Game and Fish, Idaho Department of Fish and Game, Utah Division of Wildlife Resources, Nevada Department of Wildlife, and Oregon Department of Fish and Wildlife.

Data Deposition

The following information was supplied regarding data availability:

The raw data collected by field sampling are provided in Supplementary Table S2.

Funding

R.E. was funded by a research assistantship from the University of Illinois Department of Natural Resources and Environmental Sciences. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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