Figure 6.

An illustration of the sources and assembly of microbiota associated with the gut of D. simulans and D. wallichii bowringi and the regional pool of microbiomes in the external environment (e.g., waxberry, leaf, and soil) that they may draw from. Shapes represent different types of microbes. Different arrows indicate the extent of each factor in shaping the microbial community: solid arrows indicate a strong effect, while two types of dotted arrows show a weak effect or inferred effect.