Fig. 5.
Results of “within-set” FEAST analyses. To estimate contributions from environmental sources in the immediate proximity of insects or to the infested leaf on which the insect fed, each individual insect or infested leaf was designated as a sink and the remaining ecological compartments within the same sample set (soil, infested leaf, and uninfested leaf for insects; insects, uninfested leaf, and soil for infested leaves) were designated as sources. (a) Average source contributions to fungal communities in insect samples. The “within-set” FEAST analyses attributed similar percent contributions from sources of soil (10.3%, SD ± 16.4), infested leaf (9.3%, SD ± 20.2), and uninfested leaf (9.5%, SD ± 20.9) to fungal communities in insects. A larger proportion were attributed to unknown sources (70.8%, SD ± 28.3) than in the results of “leave-one-out” analyses. (b) Average source contribution to fungal communities of infested leaf tissues. On average, a majority of fungal communities of infested leaves (86.3%, SD ± 24.4) were attributed to uninfested leaves, likely due to high similarity between these communities. In contrast, insect sources were rarely attributed (5%, SD ± 18.2) to the fungal communities of infested leaves. (c) Estimated source contributions to fungal communities of individual insects. Each bar on the x-axis represents a fungal community in an individual insect, with the estimated relative contributions of designated sources or unknown sources along the y-axis. Source contributions estimated by “within-set” FEAST analyses were variable among individual insect communities but dominated by unknown sources with negligible contribution attributed to infested leaves. (d) Estimated source contributions to individual fungal communities in infested leaf samples. Each bar on the x-axis represents a fungal community in an individual infested leaf sample with the estimated relative contributions of designated “within-set” and unknown sources along the y-axis. Insect sources were rarely attributed to the communities of infested leaf samples, consistent with the results above, and with the “leave-one-out” analysis