Fig. 6.

Partitioning of photosynthetic C in single-cell populations (A) and whole cell communities (B). (A) Mean ¹³C atom% excess (±SE) of various cell populations and the DOC pool. The number of replicate cells (or incubation flasks for DOC) is given for each bar. The C transfer efficiency was calculated as the percent of ¹³C enrichment in a given cell type (i.e., sporangia, bacteria, or the DOC pool) relative to the ¹³C enrichment in its source cell (i.e., diatoms or sporangia). (B) Distribution of photosynthetically derived C extrapolated for a naturally grown Asterionella population during an infection prevalence of up to 54% over 50 d (stacked areas). The lines show Asterionella abundances and infection prevalences (both derived from ref. 47).