Figure 5. Effect of feed matrix (filler) on proportion of reads recovered for reference taxa. Data are from experimental feed samples with 25% fishmeal and 75% filler. Tissue from known taxa were added to the fishmeal mixture in one of six discrete proportions (% tissue in fishmeal; colors). Soy filler is primarily soy flour with 2% guar gum as a binder. The animal/plant filler includes corn, rice, wheat, and sorghum flour, bloodmeal (from pig, Sus sp .), and feathermeal (chicken, Gallus sp. ) mixed with 2% guar gum for binding (mixture proportions in Table 3). The proportion of sequencing reads (y-axis) is log-scaled.