African lake provides new clues about ancient marine life
New research shows there may have been more nitrogen in the ocean between one and two billion years ago than previously thought, allowing marine organisms to proliferate at a time when multi-cellularity and eukaryotic life first emerged.
|View of Lake Kivu [Credit: Myriam Asmani/WikiCommons]|
"This is the first time that we have observed microbes recycling nitrogen by reacting it with iron in such a body of water," said Celine Michiels, lead author of the study and PhD student at UBC. "While these reactions have been observed in the lab, their activity in Lake Kivu gives us confidence that they can play an important role in natural ecosystems and allows us to build math models that can describe these reactions in oceans of the past."
Michiels and her colleagues found that when microorganisms from Lake Kivu react iron with nitrogen in the form of nitrate, some of this nitrogen is converted to gas, which is lost to the atmosphere, but the rest of the nitrogen is recycled from nitrate to ammonium, which remains dissolved and available for diverse microorganisms to use as a nutrient.
The research team used math models, informed by data collected from lake Kivu, to learn more about how this recycling could have affected life in the oceans during the Proterozoic eon. They learned that biological activity was not limited by the availability of nitrogen, as previously thought, but rather was likely limited by another key nutrient, phosphorus. Nutrient availability would have played an important role in shaping the nature and activity of life in the oceans at this time, thus setting the stage for the evolution of multicellular life and Eukaryotes.
"It's really exciting that we can use information recovered from modern environments like Lake Kivu to create and calibrate math models that reconstruct chemistry and biology from almost two billion years ago," said Sean Crowe, senior author of the study and Assistant Professor and Canada Research Chair in Geomicrobiology at UBC. "With these models and clues from rocks, we're learning more and more about how evolving life in the ancient oceans shaped Earth's surface chemistry over long stretches of early history."
The findings are published in Nature Geoscience.
Source: University of British Columbia [January 31, 2017]