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Table 1. Linear mixed effects regression after model selection
for Biomphalaria glabrata and Bulinus truncatussnail biomass in experiment one (n = 75). Positive insecticide
and fertilizer effects represent top-down and bottom-up effects on
snails, respectively. Herbicide effects were neither significant nor
consistent with positive bottom-up effects. Infected Biomphalaria
glabrata biomass did not vary with experimental treatments (see
Supplementary Information).