Microscopic communities of algae have been found in surprisingly rich and diverse habitats on Antarctic glaciers, according to research by Emily Broadwell, an academic at the University of Bristol's Cabot Institute for the Environment. Broadwell collected samples during a three-month expedition to the region, bringing them back to the lab for detailed DNA analysis.
The research uncovered a variety of snow and glacier algal species, many of which were specific to their habitats. Notably, Broadwell observed red snow algae dominating an ice cap where a different species, Ancylonema glacier, would typically be expected.
Algal blooms, while absorbing carbon dioxide through photosynthesis, can also disrupt the delicate balance of polar environments. As these plant-like organisms proliferate, they darken the surface of snow and ice. This reduced reflectivity causes the surrounding areas to absorb more heat, accelerating the melting of ice and snow.
Broadwell also analyzed algae samples from the Arctic and the Alps, noting the rapid changes occurring in these environments. "These landscapes are changing fast, and arctic and alpine glaciers might be some of the first habitats lost completely to climate change," she said.