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Contour plots of redox potential (A), denitrification (B), N2 fixation (C), and ratio of denitrification to N2 fixation (denit:NF) (D) measured within an aquarium inhabited with a single ghost shrimp. The figures on the right show those portions of the burrow (in white) that were visible at the aquarium wall at the time of sampling, and dots indicate where sampling was performed.
