FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Differential interference light micrograph of algal cysts. When conditions are unfavourable, many phytoplankton will form cysts and enter a dormant state. They can remain in this state for many months. During this time the cysts sink to the bottom of the water and can travel considerable distances on currents. Magnification: x600 when printed 10 cm wide.
Model release not required. Property release not required.