FIGURE 1 Abundance of two marine microbes illustrated by three
hypothetical scenarios. (a) equal relative abundance does not match cell
abundance due to copy number variation of the target molecular marker
(e.g., rRNA marker genes), (b) accurate relative abundance matches cell
abundance when using single copy molecular marker genes (e.g.,psb0 gene) and (c) accurate absolute abundance when using single
copy molecular marker and a DNA spike in.
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