Seawater carbonate chemistry and growth rate, dissolved silicate (DSi) uptake, biogenic silica (BSi) production, and maximum effective quantum yield in five species

This study aimed to map the fitness of ecologically important marine diatoms across a comprehensive matrix of carbonate chemistry con ditions. Fitness landscapes used here encompassed past, present, and future ocean conditions including those expected under OA and OAE. Fitness landscapes were mapped over 11 levels of total alkalinity (2000 to 3350 μmol/kg) and 8 levels of dissolved inor ganic carbon (DIC) (1800 to 3666.67 μmol/kg), for a minimum of 67 treatments per species. Using this matrix, we assessed the growth rate, dissolved silicate (DSi) uptake, biogenic silica (BSi) production, and maximum effective quantum yield in five species of locally iso lated marine diatoms.