Fig. 1. Microbial respiration across treatments during the incubation.

Respiration measured daily in the monitoring bottles (not replicated) as ion currents (m/z ratios) and expressed as ratios of a O₂ to Ar, b ¹²CO₂ to Ar, c ¹³CO₂ to Ar and d ¹³CO₂ to ¹²CO₂. Concentrations of O₂ (e) and CO₂ (f) measured in replicates (n = 4) at the beginning and at the end (day 11) of the experiment for each treatment. Blank: water with complex microbial community, but without addition of daphnia or leaves; Daphnia: daphnia only; D:L: daphnia and leaves in a given ratio with a complex microbial community; Leaves: leaves only; b-DL1:1: daphnia and leaves (ratio 1:1) in the bacterial community only.