Tropical oceans are typically nutrient-poor, yet they host vast biologically diverse reef ecosystems built by symbiotic cnidarians (including corals and anemones). This apparent contradiction, known as the Darwin Paradox, has puzzled scientists since it was first described by Charles Darwin in 1842.
Click here for original story, How a sea anemone uses its algal symbionts to assimilate nitrogen in nutrient-poor waters
Source: Phys.org