Density-dependent oxylipin production in natural diatom communities: possible implications for plankton dynamics

摘要

Weekly total phytoplankton abundance and composition at LTER-MC from January to December 2017 ( cell concentration; relative percentage). The five most abundant diatom genera and the multispecies group “Other diatoms” are represented by coloured bars. The three other major taxonomic groups are represented by grey shading bars. Missing points indicate no sampling. , Linear oxygenated fatty acid (LOFA) quantification at LTER-MC in 2017 ( ng-LOFAs/L; fg-LOFAs/diatom cell). Colours indicate fatty acid precursors of the respective oxylipin species: red = C22:6 derivatives, blue = C20:5 derivatives, green = C16:3 derivatives. Colour shadings indicate oxylipin species. Dark red: EHDPE epoxy-hydroxy-docosapentaenoic acid (C22:6); dark blue: EHETE epoxy-hydroxy-eicosatetraenoic acid (C20:5); dark green: EHHDE epoxy-hydroxyl-hexadecadienoic acid (C16:3); coral: HDoHE hydroxy-docosahexaenoic acid (C22:6); cyan: HEPE hydroxy-eicosapentaenoic acid (C20:5); green: HHTrE hydroxyl-hexadecatrienoic acid (C16:3). Missing points indicate no sampling. fg-LOFAs/diatom cell on January 4 are not shown because phytoplankton abundances are not available for this date