Drivers of species mean elevational range size
In this study, we found the annual temperature range and normalized vegetation index were the most essential variables for species mean elevational range size, while the habitat heterogeneity had little influence on the species mean elevational range size. The annual temperature range was negatively correlated with species mean elevational range size, and normalized vegetation index was positively correlated with species mean elevational range size. These results indicated that the climate variability hypothesis, the ambient energy hypothesis, and the habitat heterogeneity hypothesis failed to predict the breeding birds’ mean elevational range size pattern in Lebu Valley.