Those are the pigments that diatoms use for
photosynthesis. They are yellow-brown because the
sealgae use yellow-brown pigments to capture
sunlight,unlike land plants, who primarily use
green pigments.It is a good question why diatoms
use brown pigments and land plants green; it may
be that green is more efficient on land and less
so deeper in the water, but this is speculation as
far as I know.
Click Here to return to the search form.