https://www.usgs.gov/publications/nutrient-availability-affects-pigment-production-not-growth-lichens-biological-soil
Recent research suggests that micronutrients such as Mn may limit growth of slow-growing biological soil crusts (BSCs) in some of the drylands of the world....
nutrientavailabilityaffectspigmentproduction
https://www.ebi.ac.uk/chebi/CHEBI:26130
An endogenous molecular entity that results in a colour of an organism as the consequence of the selective absorption of light.
biological pigmentchebi