DOI: 10.5061/dryad.bzkh189q2
title: Patterns of recent Brook Trout invasion in Bull Trout streams in relation to habitat, source connectivity, biotic resistance, and disturbance

description: These data and R script were submitted in association with Canadian
 Journal of Fisheries and Aquatic Science manuscript cjfas-2025-0293:
 Patterns of recent Brook Trout invasion in Bull Trout streams in relation
 to habitat, source connectivity, biotic resistance, and disturbance.
 Detailed methodologies are provided in the manuscript. Column headers in
 the first dataset (Voss_FieldProject_FinalDataset_FieldNamesForDryad.csv)
 correspond exactly to the names of covariates in the manuscript. The
 second dataset (Voss_FieldProject_FinalDataset.csv) is identical to the
 first, except that the column headers match those used in the R script;
 this is the CSV that should be imported into R. Finally, the third dataset
 (Voss_BLTxBKT_FieldProject_BKTdensities.csv) contains the brook trout
 densities used to create Figure 3 in the manuscript. 
description: # Patterns of recent Brook Trout invasion in Bull Trout streams in
 relation to habitat, source connectivity, biotic resistance, and
 disturbance Dataset DOI:
 [10.5061/dryad.bzkh189q2](https://doi.org/10.5061/dryad.bzkh189q2) ##
 Description of the data and file structure These data and code are
 associated with Canadian Journal of Fisheries and Aquatic Science
 manuscript ID cjfas-2025-0293 focused on examining the drivers between
 patterns of Brook Trout (BKT) occupancy between a historical period
 (1999-2004) and contemporary period (2022-2023) in central Idaho. Detailed
 methodologies are provided in the manuscript. Column headers in the first
 dataset (Voss_FieldProject_FinalDataset_FieldNamesForDryad.csv) correspond
 exactly to the names of covariates in the manuscript. The second dataset
 (Voss_FieldProject_FinalDataset.csv) is identical to the first, except
 that the column headers match those used in the R script
 (Voss2025_CJFAS_analysis.R); this is the CSV that should be imported into
 R. Finally, the third dataset (Voss_BLTxBKT_FieldProject_BKTdensities.csv)
 contains the brook trout densities used to create Figure 3 in the
 manuscript. ### Files and variables #### File:
 Voss_FieldProject_FinalDataset_FieldNamesForDryad.csv
 **Description:** This is a reader-friendly version of the main dataset.
 Field names correspond exactly to the variable names in the accepted
 manuscript. ##### Variables * SiteName: Name of sampling location *
 RecoveryUnit: USFWS Bull Trout Recovery Unit * CoreArea: USFWS Bull Trout
 Core Area * huc10: Ten-digit hydrologic unit codes for watershed
 delineations provided by the national hydrography dataset * SiteLength_m:
 Length of the site in m * SampYear_h: Year in which the site was sampled
 during the historical period * BKT_pres_hist: Denoting whether Brook Trout
 &gt;= 70 mm were detected during the historical period * SampYear_c: Year
 in which the site was sampled during the contemporary sampling period *
 BKT_pres_contemp: Denoting whether Brook Trout &gt;= 70 mm were detected
 during the contemporary period * BKT_colonized: Denoting whether a
 historically unoccupied site was colonized by Brook Trout * BKT_survived:
 Denoting whether a historically occupied site continued to be occupied by
 Brook Trout * RBT: Denoting whether O. mykiss was present during the
 historical period * M_BLT: Denoting the presence of a migratory Bull Trout
 life history during the historical period * TEMP: Estimated historic mean
 August water temperature (C) #### File: Voss2025_CJFAS_analysis.R
 **Description:** This is the R script used to perform the analyses
 presented in this manuscript. #### File:
 Voss_FieldProject_FinalDataset.csv **Description:** This CSV is identical
 to Voss_FieldProject_FinalDataset_FieldNamesForDryad.csv, except that the
 variables retain their original names and are fully compatible with the R
 script Voss2025_CJFAS_analysis.R. ##### Variables * SiteName: Name of
 sampling location * SampYear_c: Year in which the site was resampled
 during the contemporary period. * ReachLength_c: Length of the site in
 meters * BKT_pres_c: Denoting whether Brook Trout &gt;= 70 mm were (1) or
 were not (0) detected during the contemporary period * BeaverDam: Denoting
 whether a beaver dam was present (p) or absent (a) during contemporary
 resampling * SampYear_h: Year in which the site was sampled during the
 historical period * BKT_pres_h: Denoting whether Brook Trout &gt;= 70 mm
 were (1) or were not (0) detected during the historical period *
 RBTpres_h: Denoting whether O. mykiss were (1) or were not (0) present
 during the historical period * BKT_colonized: Denoting whether Brook Trout
 were (1) or were not (0) detected in a historically unoccupied site during
 contemporary resampling * BKT_survived: Denoting whether Brook Trout were
 (1) or were not (0) detected in a historically occupied site during
 contemporary resampling * BKT_abandoned: Denoting whether Brook Trout were
 (0) or were not (1) detected in a historically occupied site during
 contemporary resampling * weighted_mean_ww_site: mean wetted width of the
 site using measurements collected during field sampling * huc8: Name of
 8-digit hydrologic unit code * huc10: Name of 10-digit hydrologic unit
 code * huc12: Name of 12-digit hydrologic unit code *
 norwest_MeanAugTemp_hist_c: Estimated historic mean August water
 temperature (C) * RecoveryUnit: USFWS Bull Trout Recovery Unit *
 CoreArea: USFWS Bull Trout Core Area *
 OnSite_slope_pct_new_noInt: Maximum–Minimum site elevation / site length
 (%) * dist_to_nearest_SourcePop_km: Hydrologic distance between site *i*
 and nearest source population (km) * prop_US_mtbs_high_burn: Proportion of
 upstream catchment burned by severe wildfire (1999–2023) * S1_93_11_max:
 Highest norwest_MeanAugTemp_hist_c between site *i* and nearest source
 population (°C) * VIC_MA_max: Highest annual mean daily discharge between
 site *i* and nearest source of Brook Trout (cfs) * VLI_SLOPE_max: Highest
 upstream stream gradient between site *i* and nearest source of Brook
 Trout (%) * BLT_gt400_pres_h_final: Denoting the presence of a migratory
 Bull Trout life history during the historical period #### File:
 Voss_BLTxBKT_FieldProject_BKTdensities.csv **Description:**  #####
 Variables * SiteName: Name of sampling location * BKT_per_100m2: Estimated
 density of Brook Trout &gt;= 70mm within the site, computed as the number
 of fish per 100 m^2 ## Code/software Voss2025_CJFAS_analysis.R is
 compatible with R version 4.3.3; later versions and package updates may
 cause unforseen issues. This code requires locally saved versions
 of Voss_FieldProject_FinalDataset.csv
 and Voss_BLTxBKT_FieldProject_BKTdensities.csv. All needed data imports,
 manipulations, summaries, and analyses are encoded in the annotated script
 therein. ## Access information Other publicly accessible locations of the
 data: * None Data was derived from the following sources: * Idaho
 Department of Fish and Game, U.S. Forest Service, U.S. Bureau of
 Reclamation, and Idaho Cooperative Fish and Wildlife Research Unit
 (University of Idaho) datasets.