Journal
JOURNAL OF ECOLOGY
Volume 106, Issue 6, Pages 2274-2286Publisher
WILEY
DOI: 10.1111/1365-2745.12967
Keywords
Astragalus; community assembly; dispersal limitation; fungal endophytes; priority effects; swainsonine; symbiosis
Categories
Funding
- United States Fish and Wildlife Service
- Division of Environmental Biology [1050726, 1638793]
- Direct For Biological Sciences
- Division Of Environmental Biology [1638793] Funding Source: National Science Foundation
- Division Of Environmental Biology
- Direct For Biological Sciences [1050726] Funding Source: National Science Foundation
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1. Microbial ecologists are intensely interested in the processes governing microbial community assembly; however, progress has been limited by a lack of studies that span multiple geographical scales and levels of biological organization. 2. We used high throughput sequencing to characterize foliar fungal endophyte communities and host plant genetic structure both within and among 24 populations of spotted locoweed Astragalus lentiginosus across the Great Basin Desert. 3. Across the Great Basin, both within and among populations of the host plant, fungal endophyte richness was predicted by plant size and variation in the seed-borne, heritable fungus, Alternaria fulva, which produces the bioactive alkaloid swainsonine. 4. The degree of between-plant turnover in the endophyte community was inversely related to host plant inbreeding and average plant size and positively related to the relative abundance of A. fulva. Plant size was inversely related to endophyte community richness, both among and within populations. The genetic and physical distance between host populations was not predictive of differences in fungal community structure. 5. Synthesis. Through pairing intensive local and regional sampling, we uncovered a primacy of deterministic forces imposed by a heritable symbiont on the community structure of locoweed endophytes.
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