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. 2015 May 20;5:10349. doi: 10.1038/srep10349

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Experimental results from benthic incubation chambers deployed to depths of 17 m (triangles), 11 m (squares) and 5 m (diamonds). (A) Echinocardium vs NPP, which is dissolved oxygen flux in sunlit benthic chambers. (B) Echinocardium vs TOU, which is total oxygen utilization measured at night in dark incubation chambers. (C) Echinocardium vs gross primary production, or GPP, the oxygen produced in the light discounted by the amount of oxygen utilised in the absence of light. (D) The relationship between photosynthetically active radiation (PAR) and sediment Chla content; both variables decreased with depth. (E) Echinocardium density vs Chla. (F) Echinocardium vs GPP/Chla, which is the rate of gross primary production per unit of Chla. The efficiency of the microphytobenthos in producing oxygen increases with decreasing water depth (or factors correlated with depth).