The microorganisms of Grand Prismatic Spring

Grand Prismatic Spring in Yellowstone is located in the Midway Geyser Basin and is teeming with the microbial life of thermophilic bacteria. These photosynthetically active microorganisms produce the vivid colors of this up to 70° hot spring. The color zonation marks the different inhabitants of the different temperature ranges around the hot spring. In addition, algae and protozoa thrive in the outer areas of the spring at lower temperatures.