Elevational diversity gradient

The elevational diversity gradient is an ecological pattern describing how biodiversity changes with elevation. It holds that species richness tends to decrease as elevation increases, up to a point, producing a diversity bulge at middle elevations. Multiple hypotheses have been proposed to explain the pattern, though none fully accounts for it. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/