Where will you find gypsum rocks forged by fire and water millions of years ago?
If you answered Mars, you are correct. And if you answered Cuatro Ciénegas in Mexico, that is also true. Researchers have analyzed the bacterial communities that have survived in these inhospitable springs since the beginning of life on Earth and found that sulfur components from magma and minerals from the sea (carbonates and molecules with magnesium) helped form the gypsum. In the case of the Cuatro Ciénegas Basin, the magma under the seabed was very active - it allowed for the continent displacement during the Jurassic Period. The supercontinent Pangea opened up some 200 million years ago, pushing the hemisphere north from the equator where it is now.
Probing has detected gypsum in the Gale crater where Curiosity is currently located and it indicates that mineral-rich water was present and that sulfur was able to form. In the case of Mars, there is no confirmation of tectonic movement in its crust at any point, but a large meteorite likely crashed into its primitive sea.
"Cuatro Ciénegas is extraordinarily similar to Mars. As well as the Gale crater where Curiosity is currently located on its exploration of the red planet, this landscape is the home to gypsum formed by fire beneath the seabed," Valeria Souza, evolutionary ecologist at the National Autonomous University of Mexico (UNAM) told Servicio de Información y Noticias Científicas (SINC).
Cuatro Ciénegas is one of few places on Earth 'similar' to that Martian environment. "This oasis in the middle of the Chihuahua desert is a time machine for organisms that, together as a community, have transformed our blue planet yet have survived all extinctions. How they have managed to do this can be revealed by their genes," says Souza.
The team have analyzed the metagenomes, the genome of the different bacterial communities that proliferate in these marshes by adapting parallel strategies to overcome survival challenges in a place with so little nutrients.
Cuatro Ciénegas (Mexico) and the Gale crater on Mars. Credits: Luis Eguiarte Fruns// NASA/JPL-Caltech/MSSS.
They found two communities in different pits, for example. One is 'green' and is formed by cyanobacteria and proteobacteria that have adapted to the lack of nitrogen. Another is 'red' and is made of Pseudomonas and other micro-organisms that live without hardly any phosphorous. There are also blue springs which are generally deeper and lacking in nutrients.
"Understanding the usage and exploitation strategies of phosphorous is necessary in understanding what could happen in extreme scenarios like on other planets where there is a possibly serious limitation to this and other nutrients," explains Luis David Alcaraz, Mexican researcher participating in the study from the Higher Public Health Research centre of Valencia, Spain.
The Cuatrociénegas Flora and Fauna Protection Area is a protected area but scientists and conservation groups still worry that its water is being depleted. "The bacterial communities have survived all types of cataclysms here such as the extinction of the dinosaurs or the majority of marine creatures. But, the only thing they are not adapted for is the lack of water," warns Souza.
López-Lozano NE, Eguiarte LE, Bonilla-Rosso G, García-Oliva F, Martínez-Piedragil C, Rooks C, Souza V. "Bacterial communities and the nitrogen cycle in the gypsum soils of cuatro ciénegas basin, coahuila: a Mars analogue". Astrobiology 12(7): 699-709, 2012. Doi: 10.1089/ast.2012.0840.
Mariana Peimbert, Luis David Alcaraz, Germán Bonilla-Rosso, Gabriela Olmedo-Alvarez, Felipe García-Oliva, Lorenzo Segovia, Luis E. Eguiarte, Valeria Souza. "Comparative Metagenomics of Two Microbial Mats at Cuatro Ciénegas Basin I: Ancient Lessons on How to Cope with an Environment Under Severe Nutrient Stress". Astrobiology 12 (7), 2012. Doi: 10.1089/ast.2011.0694.
Germán Bonilla-Rosso, Mariana Peimbert, Luis David Alcaraz, Ismael Hernández, Luis E. Eguiarte, Gabriela Olmedo-Alvarez, Valeria Souza. "Comparative Metagenomics of Two Microbial Mats at Cuatro Ciénegas Basin II: Community Structure and Composition in Oligotrophic Environments". Astrobiology 12 (7), 2012. Doi: 10.1089/ast.2011.0724.
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- Great Earthquakes Doubled In The Most Recent 10 Year Period - What That Means
- Why Climate 'Uncertainty' Is No Excuse For Doing Nothing
- What Americans Fear Most Isn't Ebola Or Terrorism, It's...
- Moderate Pot Use By Adolescents Doesn't Hurt IQ
- Cosmic Rays Jeopardize Deep-Space Astronaut Missions
- Slavery In America: Back In The Headlines
- HPV Vaccine Does Not Cause Multiple Sclerosis
- "Nah. It's not free for the iPhone/iPad/iPod Touch. Apple products usually don't play nice with..."
- "http://www.cdc.gov/vaccinesafety/vaccines/HPV/index.html says no interesting difference in side..."
- "Tommaso, I fully agree with you that for the moment it would be unwise and unjustified to committ..."
- "Chaos, thanks, I couldn't come up with the word. Well, sure. The article really didn't work to..."
- "So many decisions seem to be made by ISEBYs — in someone else’s back yard. ..."
- Anti-conventional ag movement spurs Big Ag to look to organic pesticides
- Can people really inherit memories?
- An end to fat shaming? The 50 year DNA mystery of metabolic dysfunction may soon be solved
- Egg freezing: a smart career move?
- Women carry fetal DNA long after children’s birth
- Despite resistance, China will dominate future of GMOs
- UNC scientists discover hidden subpopulation of melanoma cells
- Teenage self-harm linked to problems in later life
- Unsteady on your feet? Little touches could make all the difference
- Promising blood biomarkers identified for colorectal cancer: Is a screening blood test within reach?
- Studies must be carried out to determine whether exercise slows the onset of type 1 diabetes in children and adults