Additional file 1 of Home range, site fidelity, and movements of timber rattlesnakes (Crotalus horridus) in west-central Illinois

Additional file 1: Table S1. Home range and movement parameters for timber rattlesnakes (Crotalus horridus) as reported by studies across the species geographic range. Article citations marked with an asterisk (*) denote unpublished reports or graduate theses. Columns represent: Sex (reproductive condition); mean minimum convex polygon (x̄ MCP; Ha) home range size; mean home range area size via Utilization Distribution-estimators (x̄ UD; derived from 95% Kernel Density Estimates or Brownian Bridge Movement Models) Home range size; mean daily travel distance (m); mean of maximum distance from hibernacula (m); Monitoring Frequency (# of days between locations); study location, habitat type, and citation. A visual representation of study localities is shown in Fig. 1. Table S2. Grand means (± SE) of home range estimates and movement metrics for 36 snake–year combinations from 21 individual timber rattlesnakes (Crotalus horridus), tracked for one or more years in Jersey County Il during the active seasons of 2015–2019. Data summaries include multiple entries for individuals tracked for one or more years. Table S3. Model selection results examining home range area, daily travel distance, and displacement distance of timber rattlesnakes (Crotalus horridus) as a function of sex, snout-vent–length (SVL), and mass. The top-ranked mode was selected using Akaike’s information criterion adjusted for small sample sizes (AICc). Results show the home range sizes calculated using Brownian Bridge Movement Models (BBMM; 99%, 95%, 50% isopleths) and Minimum Convex Polygon (MCP). Data derived from 36 snake–year combinations from 21 individual C. horridus radio-tracked from 2015–2019 in Jersey County, Illinois. Column headings represent model rank (Rank); model parameters (Model); degrees of freedom (k); deviance (LL); AICc model weights (wi); marginal coefficient of determination (r2m); conditional coefficient of determination (r2c). Table S4. Parameter estimates, standard errors (SE), and 95% confidence intervals (CI) for the top-ranked models for home range and movement estimates, as determined using Akaike’s information criterion adjusted for small sample sizes (AICc). Significant parameters are in bold type. Data derived from 36 snake–year combinations from 21 individual timber rattlesnakes (Crotalus horridus) tracked from 2015–2019 in Jersey County, Illinois. Table S5. Average annual home range overlap indices (± CI) for 11 timber rattlesnakes (Crotalus horridus; n = 20 home range overlaps) tracked for two or more years in Jersey County Il. Overlap of home ranges calculated using the Brownian Bridge Movement Model (BBMM; for 99%, 95% and 50% isopleths) were quantified using Bhattacharyya's Affinity (BA), the Utilization Distribution Overlap Index (UDOI), and simple isopleth overlaps (i.e., dividing the area of intersection between two given home range isopleths by the total combined area of both isopleths). The latter metric was also used to calculate overlap of home ranges calculated via Minimum Convex Polygons (MCP). Figure S1. Home range overlap maps of 11 timber rattlesnakes (Crotalus horridus) VHF-radio-tracked for two or more years between 2015–2019 in Jersey County, Il. Each map depicts home range estimated using Brownian Bridge Movement Models (BBMM) at the 99%, 95%, or 50% contour. The ID, sex, and condition (M = male, F = female, G = gravid; top right) of each snake, and the year of each depicted home range is indicated in the white banner atop each map.