Carbon-consuming life-forms in Antarctica

Research on carbon-consuming life-forms in Antarctica published in JoVE
This image shows scientists loading research materials in Antarctica. Credit: The Journal of Visualized Experiments

Lake Bonney in Antarctica is perennially covered in ice. It is exposed to severe environmental stresses, including minimal nutrients, low temperatures, extreme shade, and, during the winter, 24-hour darkness. But, for the single-celled organisms that live there, the lake is home. To study them, Dr. Rachel Morgan-Kiss from the University of Miami, Ohio, and her team went to Antarctica to sample the ice-covered lake. The article describing her method will be published April 20, in the JoVE (the Journal of Visualized Experiments).

"Our laboratory has a focus on understanding adaptations in ," said Dr. Morgan-Kiss. "Ice-covered lakes are much simpler to study than typical because all of the organisms in the lake are microbial. They are at both the top and the bottom of the food chain."

Despite being microscopic, these organisms may play a big role in . Many of them have a mixotrophic metabolism, meaning that they survive either by fixing carbon, like plants, or by eating other protists (single-celled microbial eukaryotes). However, it's not known what causes these organisms to display one type of metabolism over another.

Moreover, it is not known how the this metabolic switch. If climate change causes more episodic (like storms), nutrients will be stirred up from the bottom of lakes and oceans. This could have a huge impact on protist metabolism and climate change overall.

To help answer this question, Dr. Morgan-Kiss and her team took samples from different parts of the lake— the top, middle, and bottom— where the nutrient to sunlight ratios in the lake vary. The top gets plenty of sunlight, but there are few nutrients; the middle of the lake has moderate amounts of both; and the bottom gets little sunlight but is nutrient-rich.

"This interesting video-article produced by the JoVE Video team helps show exactly how scientists navigate in this challenging environment" says Dr. Beth Hovey, JoVE Editorial Director. "Research in Antarctica can add a great deal of insight in the realm of climate change. By opening a window into how to conduct science in extreme environments, Dr. Morgan-Kiss and her colleagues are helping advance this field of study."


Explore further

Lake Erie algae, ice, make a nice mix in winter

Provided by The Journal of Visualized Experiments
Citation: Carbon-consuming life-forms in Antarctica (2012, April 23) retrieved 25 April 2019 from https://phys.org/news/2012-04-carbon-consuming-life-forms-antarctica.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
0 shares

Feedback to editors

User comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more