show Abstracthide AbstractThe “DYE labeling of diatom silica” (DYEatom) cruise was a multi-faceted, study ondiatom bloom dynamics and silicon cycling conducted aboard the R/V Point Sur 27 June – 5 July 2013. The magnitude of PAR just below the surface (I0) was used to determine the depths at which PAR was 55%, 22%, and 1% I0. Samples for 16S and 18S rRNA and metatranscriptome sequencing were collected from these depths.