Color in Water: Algae Sense a Wide Spectrum (video) University of California - Davis Share Print E-Mail Loading video... Caption Land plants detect light with pigments called phytochromes, which are sensitive to red light. But red light is absorbed by water, so aquatic algae have evolved phytochromes with a much wider spectrum. Credit Video by Andy Fell/UC Davis. Usage Restrictions May be used with acknowledgement of the source. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.