Abstract
Abstract Mycorrhizas face unique anthropogenic stressors in urban environments, but the factors influencing their abundance in cities remains comparatively unstudied. Using green roofs as a model system, we built a conceptual model outlining the biotic and abiotic factors influencing arbuscular mycorrhizal (AM) fungal abundance in cities. We then tested this model and its multiple causal hypotheses with structural equation modeling using plant, soil, and AM fungal abundance measurements from 60 plots across 12 green roofs in Chicago, USA. The best direct predictor of AM fungal abundance was not plant cover, plant richness, or soil nutrients, but instead green roof age, suggesting temporal accumulation of AM fungal propagules in degraded urban environments. Soil P had the strongest total effect on AM fungal abundance both directly and via indirect promotion of plant cover. This study highlights knowledge gaps and challenges to studying the urban ecology of AM fungi.
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