Abstract
Fifteen environmental variables of potential biological importance are studied. These variables quantify productivity, altitude, topographic heterogeneity, and a variety of climatic dimensions. Most of these variables are not normally distributed, according to the Kolmogorov‐Smirnov One‐Sample Test. Spearman's coefficient of rank correlation indicates that many of them are highly and significantly correlated. Principal components analysis reveals a gradient of increasing temperature from north to south and an orthogonal gradient of increasing precipitation across the state. Based on these vectors four climatic regions (warm‐moist, warm‐dry, cool‐moist, cool‐dry) are recognized in Texas. An interpretation of the biological meaning of the variables is presented. These data are of potential used as a resource base for studies of relationships between environmental factors and biological variation.
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