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Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.

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Updated: May 1, 2026

Laboratory Simulation of an IronII-rich Precambrian Marine Upwelling System to Explore the Growth of Photosynthetic Bacteria

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Evolution: a fixed-nitrogen fix in the early ocean?

Timothy W Lyons¹, Christopher T Reinhard², Noah J Planavsky³

¹Department of Earth Sciences, University of California, Riverside, CA 92521, USA.

Current Biology : CB

|April 5, 2014

Summary

This summary is machine-generated.

A recent study suggests a key evolutionary development in cyanobacteria boosted ocean oxygen levels. This advancement in nitrogen fixation ended prolonged nitrogen limitation, paving the way for animal life.

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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

Published on: October 7, 2020

Area of Science:

* Evolutionary biology
* Oceanography
* Biogeochemistry

Background:

* Marine primary production has historically been limited by nitrogen availability.
* The evolution of nitrogen fixation in cyanobacteria is a critical process in marine ecosystems.
* The rise of atmospheric oxygen and animal life are major events in Earth's history.

Purpose of the Study:

* To investigate the impact of an evolutionary leap in cyanobacterial nitrogen fixation.
* To determine the role of this leap in ending oceanic nitrogen limitation.
* To correlate this event with increased biospheric oxygen and animal diversification.

Main Methods:

* Analysis of evolutionary timelines for cyanobacterial nitrogen fixation.
* Modeling of oceanic primary production under varying nitrogen conditions.
* Geochemical analysis to track oxygen level changes.

Main Results:

* A significant evolutionary advancement in cyanobacterial nitrogen fixation occurred late in Earth's history.
* This advancement effectively ended widespread nitrogen limitation in marine environments.
* The study correlates this event with a substantial rise in atmospheric oxygen and the diversification of animal life.

Conclusions:

* The late evolutionary leap in cyanobacterial nitrogen fixation was a pivotal moment in Earth's history.
* This biological innovation fundamentally altered oceanic productivity and atmospheric composition.
* It provided the necessary conditions for the subsequent rise and diversification of animal life.