Citation:

Neilson, R., G. King, R. DeVelice, AND J. Lenihan. REGIONAL AND LOCAL VEGETATION PATTERNS: THE RESPONSES OF VEGETATION TO SUBCONTINENTAL AIR MASSES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/D-90/075 (NTIS PB90246414), 1990.

Description:

Spatial patterns of biodiversity in plants were examined through a range of scales from continental and biome to patterns of local habitat variation. e propose a hierarchy of constraints on these patterns. arge-scale climate is proposed to structure continental patterns of species richness and the diversity and distribution of physiognomic types in the form of biomes. ithin biomes regional climatic gradients modulate the length scales of habitats and, hence, the amount of substrate variation within a grain that is perceived by an organism as homogeneous. ost resource variation in the core of biomes is within a given species range of tolerance and large areas of the landscape are perceived as essentially homogeneous. s one moves toward ecotones, the convergence of regional climatic stresses constrains the suitability of habitats to smaller scale variations in substrate and topography. hus, the size of habitat grain declines, while the diversity of habitat grains increases toward biome ecotones. iotic interactions form a third level of constraint, operating at yet a smaller spatial scale, to further modify local species associations. hese regional gradients in habitat size and variability provide explanatory power of observed patterns in biodiversity and provide a monitoring tool for climate-induced changes in ecotones.

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