science
Antarctic expedition finds diverse algae communities on Signy Island
A University of Bristol researcher collected samples from Signy Island showing distinct snow and glacier algae communities. The findings, published in ISME Communications, indicate these ecosystems may respond differently to warming than those on the Greenland Ice Sheet.
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A three-month field study on Signy Island has documented distinct communities of snow and glacier algae in one of Antarctica's most isolated locations. Dr Emily Broadwell led the expedition as part of her doctoral research at the University of Bristol.
She and five colleagues collected samples from multiple ice and snow surfaces while based at a former whaling station operated by the British Antarctic Survey since 1947.
Expedition conditions and sample collection The journey to the island took two weeks and required crossing ocean waters where swells can reach 18 metres. Temperatures on site averaged around 0C. Samples were returned to the University of Bristol's Cabot Institute for the Environment. DNA analysis compared the Antarctic material with specimens previously gathered from Arctic and Alpine sites.
Key findings on algal diversity The study recorded a range of algal species tied to specific habitats. Red snow algae were found dominating the ice cap, an area where Ancylonema glacier algae are more commonly expected.
“The research uncovered a surprisingly rich and habitat-specific diversity of both snow and glacier algal species." — Dr Emily Broadwell, postdoctoral researcher at Aarhus University Results showed that different ice and snow surfaces supported separate communities, including ecological niches rarely documented elsewhere.”
Implications for climate response Algal blooms absorb carbon dioxide through photosynthesis yet also darken surfaces, lowering reflectivity and accelerating melt. The Signy Island data suggest future blooms in this region may follow a different pattern from those observed on the Greenland Ice Sheet.
“These landscapes are changing fast, and arctic and alpine glaciers might be some of the first habitats lost completely to climate change." — Dr Emily Broadwell Study co-author Dr Chris Williamson said the findings point to the need for additional sampling to map microbial distribution in polar environments.”
