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Percentage of Daphnia where production of first clutch eggs was observed in different microbiota (triangles=symbiotic; circles=germ-free) and food quantity (open=high (2 mg C l−1 per day); filled=intermediate (0.5 mg C l−1 per day)) treatments. Data from the starvation- and low food quantity treatments are omitted from the graphs because here no egg deposition was observed.
