FIG 5.

Recovery of DNA from AAO filters as a function of volume of sample filtered, expressed as either the total (A) or the estimated percentage (B) of DNA recovered from seawater or the total (C) or percentage (D) of DNA recovered from a dinoflagellate culture. Percent recoveries for the seawater samples were calculated relative to an estimate of the concentration of planktonic DNA in the seawater obtained by direct extraction of cells and viruses that were pelleted by ultracentrifugation from a subsample of the same water. To calculate percent recoveries from the dinoflagellate culture, the concentration of DNA in the culture was estimated by direct liquid extraction of a culture subsample. Values shown are means and standard deviations from triplicate assays.