Scale matters: the role of topography on alpine plant diversity from genes to ecosystems

Mountain landscapes offer paradigmatic examples of how biodiversity is shaped by environmental heterogeneity. Across short spatial distances, rugged topography generates strong variation in solar radiation, snow persistence, wind exposure, soil moisture, and temperature, creating a complex mosaic of habitats that supports an extraordinary diversity of plant life. While the influence of elevational gradients on species distributions and ecosystem functioning has long been recognized (Humboldt and Bonpland 1805 ), growing evidence demonstrates that topographically driven variation at finer spatial scales can be equally, and sometimes more, important in determining the conditions experienced by organisms (Scherrer and Körner 2011 ). In mountain environments, ecological patterns emerge from the interplay between broad-scale climatic gradients and local topographic context, making these systems particularly valuable for investigating the mechanisms that govern biodiversity across biological levels and spatial scales.