Rotifer in meltwater. Light microscopy footage of a rotifer in meltwater formed from cryoconite ice holes. Rotifers are microscopic organisms found in waters worldwide. They are mostly found in freshwater habitats, but some are found in marine environments. They feed on the decaying remains of plants and animals. Cryoconite is a powdery dust and sediment transported by the wind to fall on a glacier or ice sheet. The sediments absorb heat from the sun and melt downwards into the ice, forming holes. The sediments and meltwater can contain microfauna and extremophiles, microbes that exist in extreme conditions such as freezing temperatures. This sample is from Greenland.