This is the first time I've heard of selenium (Se) as a potentially limiting element. Lots of other interesting info in there about how the nutrients released are ultimately consumed and recycled either by other phytoplankton or bacteria.
I learned that scientists switched from measuring in lux (the amount of illumination) and started measuring light power only since the 1980's! Today, light power is mostly expressed as PAR, but some authors still seem to refer to the precursor, µE's. (An obvious salute to Einstein.)
Yet another article for those who look at nutrients and algae as something to avoid, eliminate and be worried about.