Copepod and microalgae symbiotic relationship, light micrograph
Light micrograph of a symbiotic relationship between microalgae and copepods. The microalgae are epibionts living on the surface of the copepod. Normally, these species live separately, but in times when resources such as nutrition and oxygen levels are low, both benefit from a symbiotic relationship between microalgae and copepods. Overgrown copepods, comç’¸ared to those free from microalgae, are believed to have advantages in oxygen supply provided by the At the same time, the copepod is the source of ammonium nitrogen the algae need. Magnification: x70 when printed at 10 centimetres wide at its longest edge. by HAKAN KVARNSTROM / SCIENCE PHOTO LIBRARY
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