Table 1.

Biological, geophysical and socioeconomic variables. All of these variables were considered for inclusion in the analyses. Based on a correlation matrix with these initial 12 variables (electronic supplementary material, figure S1), we found some to be highly correlated with one another (Pearson's r > |0.5|), so we restricted our analyses to those factors that maximized coverage and questions of interest. These variables are indicated in the ‘used’ column below. sp., species.

codevariablescaleuseddetails
groundDivlocal ground vegetation diversitylocal (house property extent)yesassessed as low (0–5 sp.), medium (6–15 sp.) or high (>15 sp.); for plants <1.5 m tall
canopyDivlocal canopy diversitylocal (house property extent)noassessed as low (0–5 sp.), medium (6–15 sp.) or high (>15 sp.); for plants >1.5 m tall
groundCoverlocal ground vegetation coverlocal (house property extent)yesassessed as low (0–33%), medium (34–66%) or high (67–100%)
canopyCoverlocal canopy coverlocal (house property extent)yesassessed as low (0–33%), medium (34–66%) or high (67–100%)
houseAgehouse agelocal (house property extent)yespublic property records obtained through online realty website (trulia.com), as of 2015
totalValuehouse valuelocal (house property extent)nopublic property records obtained through online realty website (trulia.com), as of 2015
sqFeethouse square footagelocal (house property extent)yespublic property records obtained through online realty website (trulia.com), as of 2015
incomemean neighbourhood household incomelandscape (census block)yesAmerican Community Survey 2011 dataset at the census block level, obtained through R package ‘acs’
imp100mimpervious surface arealandscape (100 m radius)noNational Land Cover Database 2011, accessed through the Multi-Resolution Land Characteristics Consortium (MRLC)
imp500mimpervious surface arealandscape (500 m radius)yesNational Land Cover Database 2011, accessed through the Multi-Resolution Land Characteristics Consortium (MRLC)
can100mcanopy coverlandscape (100 m radius)yesNational Land Cover Database 2011, accessed through the Multi-Resolution Land Characteristics Consortium (MRLC)
can500mcanopy coverlandscape (500 m radius)noNational Land Cover Database 2011, accessed through the Multi-Resolution Land Characteristics Consortium (MRLC)