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Credit: © Don E. Canfield/University of Southern Denmark The first photosynthetic oxygen-producing organisms on Earth were cyanobacteria. Their evolution dramatically changed the Earth allowing oxygen to accumulate into the atmosphere for the first time and further allowing the evolution of oxygen-utilizing organisms including eukaryotes. Eukaryotes include animals, but also algae, a broad group of photosynthetic oxygen-producing organisms that now dominate photosynthesis in the modern oceans. When, however, did algae begin to occupy marine ecosystems and compete with cyanobacteria as important phototrophic organisms? In a new study Zhang et al use the molecular remains of ancient algae (so-called biomarkers) to show that algae occupied an important role in marine ecosystems 1400 million years ago, some 600 million years earlier than previously recognized.

Shuichang zhangDon canfieldUniversity of southern denmarkNordic centerXiamaling formationEarth evolutionSouthern denmarkMarine freshwater biologyEarth scienceதாதா கேன்ஃபீல்ட்பல்கலைக்கழகம் ஆஃப் தெற்கு டென்மார்க்நோர்டிக் மையம்பூமி பரிணாமம்தெற்கு டென்மார்க்