Microbialites In Lake Joyce Antarctica

What Are They Doing?

Underwater microbial community in Lake Joyce, AntarcticaUnderwater microbial community in Lake Joyce, Antarctica The oldest fossil life on Earth consists of stromatolites, which are the remains of complicated communities of bacteria captured in rock. On modern Earth, similar communities still grow in places that are too harsh for worms, snails, and other grazing animals to live and eat them. Lakes in Antarctica with liquid water below a few meters of ice almost always support these communities. Thus, they provide the opportunity to study the ecology of microbial communities like those on early Earth billions of years ago.

The research team studied the communities in Lake Joyce, Antarctica in several different ways. They took images of the stromatolites in Lake Joyce and reconstructed the 3D morphology of microbial mats in the lake. They also characterized the environment that the stromatolites are growing in and studied how the morphology of the stromatolites varies mud deposition and calcite mineral formation. They also directly sampled the stromatolites to study the distribution of photosynthesis, calcite mineral formation, and mud incorporation.

They expect this study to make several important contributions to understanding early life on Earth. Morphological studies of the stromatolites will provide insights into how microbial communities build intricate structures and how variations in environment and ecology affect morphology. Results will also help researchers understand how microbial communities influence calcite mineral growth and how this affects stromatolite morphology. Results will be directly applicable to better interpreting ancient stromatolites, providing insights into ecological and biogeochemical processes on early Earth. Finally, a better understanding of the processes by which microbial communities build stromatolites will aid in the search for evidence of life on other planets, such as Mars, where landed missions have access to sedimentary rocks.

Where Are They?

Lake Joyce, AntarcticaLake Joyce, Antarctica The research team first traveled by commercial airline to New Zealand and from there took a military transport plane to McMurdo Station, Antarctica. The team then flew by helicopter to Lake Joyce in the McMurdo Dry Valleys. The McMurdo Dry Valleys are located on the western coast of McMurdo Sound and form the largest relatively ice-free area on the Antarctic continent. The perennially ice-covered lakes, frozen alpine glaciers, and extensive areas of exposed soil and permafrost within the McMurdo Dry Valleys are subject to low temperatures and limited snowfall.


Extracting a sediment trap.
Did our sediment traps work? Its been over a year since my science team and I have left The Ice and returned to North America. However, that doesn’t mean that our science is finished! I thought I’d give you a follow up to our field season from last year. A Recap One of the major goals of our field work from last year was to investigate the question about how sedimentation would influence the growth of the microbial mat structures. We hypothesized that in areas with a lot of sediment being transported into the lake, the mats would be flatter, as opposed to pinnacled in shape with delicate...
Anne Jungblut counting different species under the microscope.
The Microverse There are microbes everywhere, and most of the time, we think nothing of them. They live all around us, on us, and inside us. They also make up the communities at the bottom of Lake Joyce. Megan and Anne are the microbiologists on our team, and their passion for studying these organisms is inspiring! Some of these microorganisms are autotrophs, which means that they make their own food through photosynthesis. The autotrophs are dominated by cyanobacteria -- bacterial cells that contain chlorophyll. Others are heterotrophs who consume food in order to get energy. Megan and...
The G-063 team!
Some Final Thoughts All members of G-063 are now either home, or on their way home... I've been putting off this journal telling you that I made it, partly because I don't want it to be over! I'll add a couple more posts soon that I didn't get a chance to finish... but for now, here are some of the things I will dearly miss: The G-063 team! Doing cool science.... The remote beauty... Some Thank You's! It's much better for me to think of this as the beginning of longterm friendship and collaboration with G-063 members! It won't ever be quite the same as it was at Lake Joyce, and I...
There have been many times during this field season when I catch myself thinking "This is the most exciting/bizarre/adventurous thing I've ever done". I think I'm having one of those surreal moments right now. As I write this, I'm riding an LC-130 back to Christchurch. It's a smaller, propeller driven aircraft that the USAP (United States Antarctic Program) uses to land and take off safely on the ice without breaking it. It has skis on the bottom for taking off on the ice, and wheels too, for when we touch down in Christchurch. It's also called a "Hercules", or just plain "herc" for short...
G-063 skiing near Scott Base. Photo by Justin Lawrence.
G-063 is all packed up and ready to fly back to Christchurch, New Zealand, but we can't yet! We were originally supposed to depart yesterday but poor weather conditions have caused several flight delays. Now we are scheduled to leave on Saturday. We befriended another team of researchers who were scheduled on the flight ahead of us. At one point earlier in the week, they actually got so far as to be on the plane with the propellers turning, only to be sent back to McMurdo! They finally successfully left here yesterday. While we wait, we've found some fun things to do. Yesterday we had a...

Expedition Resources

Project Information

10 October 2014 to 17 December 2014
Location: Dry Valleys, Antarctica
Project Funded Title: Microbialite Morphology in Lake Joyce, Antarctica

Meet the Team

Lucy Coleman's picture
Natomas Charter School
Sacramento, CA
United States

Although Lucy Coleman grew up camping a lot, it wasn't until after college that she discovered a lifelong passion for helping others appreciate and understand the natural world. For a few years, she spent summers as an interpretive park ranger in Glacier National Park and the school years teaching environmental science at outdoor schools in California. From there, it was a natural transition to settle into a very rewarding teaching career at Natomas Charter School's Performing and Fine Arts Academy, where she's taught life and physical science to 7th and 8th graders since 2001. She enjoys developing interdisciplinary curriculum that connects science with technology, language arts, math and art. Ms. Coleman is especially passionate about climate education and finding innovative solutions to environmental problems. Every day, she appreciates her students' love of learning and discovering new things.

When not teaching, Ms. Coleman makes fast tracks for the wild and roadless places of our planet. Although she and her husband love having overseas adventures, she thinks there's no finer place than the Sierra Nevada in the summertime! In addition to backpacking, her favorite pastimes include trail running, sea kayaking, cross-country skiing, gardening and reading.

Dawn Sumner's picture
University of California, Davis
Davis, CA
United States

Dawn Sumner was an undergraduate at the California Institute of Technology, when she became interested in geology. She subsequently moved to the Massachusetts Institute of Technology to work with Dr. John Grotzinger and others on 2.5 billion year old carbonates in South Africa. Dr. Sumner finished her PhD in geology in 1995, after which time she returned to the California Institute of Technology as a Postdoctoral Fellow. In December 1996, Dawn joined the Faculty at the University of California, Davis, and she is still a professor there. Most of Dr. Sumner's research has focused on understanding environments on early Earth and the early evolution of bacteria, including photosynthesis. In recent years, her research has expanded to include studying modern microbial communities growing in ice-covered Antarctic lakes that are analogs for ancient life on Earth and possibly elsewhere in the solar system. In addition, she is a member of NASA's Mars Science Laboratory, helping the rover Curiosity explore ancient environments in Gale Crater on Mars. Dr. Sumner regularly shares her research and adventures with the public and is dedicated to helping students of all backgrounds prepare for careers in science. More information about Dr. Sumner can be found here.

Tyler Mackey's picture
University of California, Davis
Davis, CA
United States

Tyler's introduction to field-based research was as an undergraduate student on the frozen shorelines of Lake Superior, working with modern frozen beach processes to better understand deposits left by ancient beaches. Modern environments provide a key to earth history, and Tyler enjoys exploring the relationships between the two. Since coming to Davis, his research interests have expanded to include diving over modern microbial communities at the bottom of ice-covered lakes in Antarctica. These microbial communities grow into complicated shapes due to the relationship between microbial behavior and their surrounding environment, and these relationships frame interpretations of ancient microbial ecology from deposits in the rock record. Tyler is pursuing graduate studies with the end goal of a career in teaching and research, where he hopes to give students the opportunity to engage and explore the world in new and unexpected ways.

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Latest Comments

Hai hope your trip was fun! :)
great term!! timely post as we are always bringing up these community organisms in bio. It's so great to make this real world connection! It's amazing to me how much there is still to learn....1%!
Yamini-- I hope you got to WAIS eventually! It's a bit of a waiting game, right? I enjoyed meeting you and hope we can stay in touch. I'll be following your journals and i hope you enjoy your time in...
I'm so glad that you were able to use my journals in your class- that's so so GREAT!! Thanks for following- maybe I can connect to you and your classes sometime, and I'll see you in the SEED...
Great journals...awesome trip. Feel free to post more..my class will keep checking in and we will figure out a skype time this spring!