DOI: 10.5061/dryad.8w9ghx3j7
title: Body size trends in response to climate and urbanization in the widespread North American deer mouse, Peromyscus maniculatus

description: Body size decline is hypothesized to be a key response to climate warming,
 including warming driven by urban heat islands. However, urbanization may
 also generate selective gradients for body size increases in smaller
 endotherms via habitat fragmentation. Here we utilize a densely sampled,
 multi-sourcedataset to examine how climate and urbanization affect body
 size of Peromyscus maniculatus (PEMA), an abundant
 rodent found across north America. We predicted PEMA would conform to
 Bergmann’s Rule, e.g. larger individuals in colder climates, spatially and
 temporally. Hypotheses regarding body size in relation to urbanization are
 less clear; however, with increased food resources due to greater
 anthropogenic activity, we expected an increase in PEMA size. Spatial
 mixed-models showed that PEMA conform to Bergmann’s Rule and that PEMA
 were shorter in more urbanized areas. With the inclusion of decade in
 mixed-models, we found PEMA mass, but not length, is decreasing over time
 irrespective of climate or population density. We also unexpectedly found
 that, over time, smaller- bodied populations of PEMA are getting larger,
 while larger-bodied populations are getting smaller. our work highlights
 the importance of using dense spatiotemporal datasets, and modeling
 frameworks that account for bias, to better disentangle
 broad-scale climatic and urbanization effects on body size.
description: P.maniculatus_spatial&temporal_models.R 
 R script with all PEMA spatial and temporal models
 for body mass and head-body length. 
 pema_new_rezone_bodymass_decade_nojuv_rezone_centroids_noNEON.csv
   PEMA temporal body mass data file without
 juveniles or NEON data.  
 pema_new_rezone_bodymass_decade_rezone_centroids_noNEON.csv
    PEMA temporal body mass data file with
 juveniles, but without NEON data.  
 pema_new_rezone_bodymass_nojuv_rezone_centroids.csv 
 PEMA spatial body mass data file without juveniles,
 but with NEON data.  
 pema_new_rezone_bodymass_nojuv_rezone_centroids_noNEON.csv
    PEMA spatial body mass data file without
 juveniles or NEON data.  
 pema_new_rezone_bodymass_rezone_centroids.csv  
 PEMA spatial body mass data file with juveniles
 and NEON data.  
 pema_new_rezone_bodymass_rezone_centroids_noNEON.csv   
 PEMA spatial body mass data file without juveniles or
 NEON data.  
 pema_new_rezone_hblength_decade_nojuv_rezone_centroids_noNEON.csv
    PEMA temporal head-body length data file
 without juveniles or NEON data.  
 pema_new_rezone_hblength_decade_rezone_centroids_noNEON.csv
    PEMA temporal head-body length data file
 with juveniles, but without NEON data.  
 pema_new_rezone_hblength_nojuv_rezone_centroids.csv  
 PEMA spatial head-body length data file without
 juveniles, but with NEON data.  
 pema_new_rezone_hblength_nojuv_rezone_centroids_noNEON.csv
    PEMA spatial head-body length data file
 with juveniles, but without NEON data.  
 pema_new_rezone_hblength_rezone_centroids.csv   
 PEMA spatial head-body length data file with
 juveniles and NEON data.  
 pema_new_rezone_hblength_rezone_centroids_noNEON.csv  
 PEMA spatial head-body length data file with
 juveniles, but without NEON data.  
 PEMA.NACSM.csv Digitized PEMA
 NACSM data.