mountain-biodiversity
Mountain biodiversity refers to the remarkable variety of plant species, communities, and ecosystems found across altitudinal gradients and rugged terrain in mountainous regions. These environments serve as critical refugia and evolutionary hotspots, where steep environmental gradients over short distances drive rapid speciation and adaptation in plant populations. Understanding mountain plant diversity is essential for conservation biology, as these habitats are disproportionately sensitive to climate change and harbor many endemic and range-restricted species.
open_in_new WikipediaEurope PMC · 2026-04-08
A global study of mountain plants found that energy availability — sunlight and temperature — is a stronger predictor of where rare, mountain-only species concentrate than the physical ruggedness of terrain. The exception is low-growing herbs, where landscape complexity matters more.
Energy availability explains ~69% of variation in tree endemic richness vs. ~59% for topographic heterogeneity, making it the stronger global predictor for woody plants.
For endemic herb plants, the pattern flips: topographic heterogeneity is more explanatory (76.70% ± 14.34%), suggesting landscape complexity drives diversity for low-growing flora.
In regions with unusually stable energy supplies, such as the Cape of Good Hope, terrain complexity becomes the dominant driver of plant richness — highlighting that the energy-vs-topography balance is context-dependent.