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Light-dependent variation in pigment content was examined in 11 marine phytoplank- ton species representing 8 algal classes. Batch cultures of each species were acclimated to 7 irradi- ances between 10 and 700 µmol photons m -2 s -1 . High-performance liquid chromatography analysis on exponentially growing cultures revealed that pigment ratios normalised to chlorophyll a (chl a) generally fell within the ranges previously reported for species of the same taxa. Unambiguous light- harvesting pigments (e.g. chlorophylls, fucoxanthin) showed limited amplitude of variation between low and high light conditions, while those involved in photoprotection (e.g. zeaxanthin, lutein, allo- xanthin, diatoxanthin) dramatically increased under high light. Most of the relationships between pigment:chl a ratios and growth irradiance were quite well described using simple linear models. Among pigments shared by several species, chl b and c3, fucoxanthin, zeaxanthin, lutein, diadino- xanthin and diatoxanthin exhibited similar trends regardless of the species studied, allowing general equations to be determined for each of these pigments. Determination of light:pigment relationships is a prerequisite for the development of more advanced modeling techniques such as artificial neural networks in chemotaxonomic studies.

Relationships between pigment ratios and growth irradiance in 11 marine phytoplankton species