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Treatment effects on performance of N-fixing lichens in disturbed soil crusts of the Colorado Plateau Biological soil crusts arrest soil erosion and supply nitrogen to arid ecosys- tems. To understand their recovery from disturbance, we studied performances of Collema spp. lichens relative to four experimental treatments plus microtopography of soil pedicels, oriented north-northwest to south-southeast in crusts. At sites in Needles (NDLS) and Island in the Sky (ISKY) districts of Canyonlands National Park, lichens were transplanted to NNW, SSE, ENE, WSW, and TOP pedicel faces and exposed to a full-factorial, randomized block experiment with four treatments: nutrient addition (P and K), soil stabilization with polyacrylamide resin (PAM), added cyanobacterial fiber, and biweekly watering. After 14.5 mo (NDLS) and... Categories: Publication; Types: Citation, Journal Citation; Tags: Collema, Colorado Plateau, Ecological Applications, Microcoleus vaginatus, Utah, All tags... biological soil crusts, cryptobiotic crusts, cyanobacteris, lichen, microbiotic crusts, microtopography, nutrients, Fewer tags Microtopography of microbiotic crusts on the Colorado Plateau, and distribution of component organisms We analyzed the microtopography of microbiotic soil crusts at 3 sites on the Colorado Plateau of southern Utah and investigated distributions of cyanobacteria and several lichens in distinctive microhabitats created by this topography. At all 3 sites the long axes of linear soil mounds were oriented nonrandomly in a NNW?SSE direction. The conspicuous and consistent orientation of soil mounds may result from a combination of physical and biotic processes. Subtle differences across sites in mound orientation and organismal distribution suggest that these variables may be useful in comparing disturbance histories of crusts retrospectively. Differences in colonization frequencies, abundances, and distributions of microorganisms... Categories: Publication; Types: Citation, Journal Citation; Tags: Collema, Western North American Naturalist, colonization, cryptobiotic soil, cyanobacteria, All tags... disturbance history, exposure, lichen, microbiotic crusts, microtopography, nonrandom orientation, Fewer tags