Climate Change / Ecology / Biodiversity Conservation / Potential Evapotranspiration / Species Distribution / Species Richness / Latitudinal Gradient / North America / Spatial Variation / North American / Large Scale / Ecological Applications / ENVIRONMENTAL SCIENCE AND MANAGEMENT / Species Richness / Latitudinal Gradient / North America / Spatial Variation / North American / Large Scale / Ecological Applications / ENVIRONMENTAL SCIENCE AND MANAGEMENT