International Scholarly Research Notices

Research Article

Climate and Competition Shape Species' Borders: A Study of the Panamint (Crotalus stephensi) and Speckled (Crotalus mitchellii) Rattlesnakes

Table 1

An estimate of relative contributions of environmental variables to the Maxent model. One star (*) indicates percent contribution greater than 5% difference between the two species. Two stars (**) indicate percent contribution greater than 10% difference between the two species.
VariablePercent contribution
Crotalus m. pyrrhusCrotalus stephensi
Annual mean temperature00
Mean Diurnal Range**6.119.7
Isothermality**0.116.2
Temperature seasonality**12.60
Max temperature of warmest month*7.80
Min temperature of coldest month*1.38.5
Temperature annual range1.50.4
Mean temperature of wettest quarter**0.413.1
Mean temperature of driest quarter0.80.1
Mean temperature of warmest quarter0.20
Mean temperature of coldest quarter **13.20.8
Annual precipitation00.3
Precipitation of wettest month00
Precipitation of driest month*8.80.7
Precipitation seasonality*9.22.4
Precipitation of wettest quarter00
Precipitation of driest quarter6.68.2
Precipitation of warmest quarter28.128.8
Precipitation of coldest quarter3.10.1