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James H

This can be calculated from the estimates in:

William B. Whitman, David C. Coleman, and William J. Wiebe
Prokaryotes: The unseen majority
PNAS 1998 95:6578-6583

and the observation that in sediment and subsurface samples, microorganisms are 10-1000 times more abundant in solid samples than groundwater samples (see, for example, this work where the ratio of free-living to planktonic was found to be 1:100):

Lehman, R. Michael, Colwell, Frederick S., Bala, Greg A.
Attached and Unattached Microbial Communities in a Simulated Basalt Aquifer under Fracture- and Porous-Flow Conditions
Appl. Environ. Microbiol. 2001 67: 2799-2809

Using these estimates, sessile microorganisms (and those in biofilms) far outnumber planktonic organisms. Depending on the values used from the above ranges, there are at between 7 and 50 times as many attached organisms.

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