Relationships between aggregate settling velocity and aggregate size. Settling velocity vs. aggregate size for aggregates of phytoplankton-only (T. weissflogii) in green, aggregates with phytoplankton and 4000 microbeads L^–1 (set-up 3, treatment 8) in red and aggregates with phytoplankton, 4000 microbeads L^–1 and 130 mg L^–1 sediments (set-up 4, treatment 12) in black. The aggregate sizes presented are the size of the aggregates settling past the camera in the settling tube, with some breakage and further aggregation possible during transport from roller tank to settling tube and within the settling tube prior to passing the camera. Solid lines indicate data fit to a logarithmic regression, with line equations given in the figure. DOI: https://doi.org/10.1525/elementa.317.f4