Experimental treatments, the total number of animals per treatment, and the average and standard deviation (SD) in the drawdown of chlorophyll <i>a</i> concentration (μg/L) over the three hour experimental period for each treatment.

Treatment labels correspond to: controls (with no macro-organisms); oyster Crassostrea virginica (O); clam Mercenaria mercenaria (CL); and crab Petrolisthes armatus (P). All treatments were run both with and without Panopeus herbstii predators and replicated four times each, except O and O-CL, which were replicated six times each.