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Eukaryotic stromatolite builders in acid mine drainage: Implications for Precambrian iron formations and oxygenation of the atmosphere?

¹ Department of Geography, Geology, and Anthropology, Indiana State University, Terre Haute, Indiana 47809, USA
² Department of Geology, University of Kansas, 1475 Jayhawk Boulevard, 120 Lindley Hall, Lawrence, Kansas 66045, USA
³ Department of Life Sciences, Indiana State University, Terre Haute, Indiana 47809, USA
⁴ Department of Geology and Geological Engineering, Colorado School of Mines, Golden, Colorado 80401, USA

Biological activity of Euglena mutabilis, an acidophilic, photosynthetic protozoan, contributes to the formation of Fe-rich stromatolites in acid mine drainage systems. E. mutabilis is the dominant microbe in bright green benthic mats (biofilm), coating drainage channels at abandoned coal mine sites in Indiana. It builds biolaminates through phototactic and aerotactic behavior, similar to prokaryotes, by moving through precipitates that periodically cover the mats. E. mutabilis also contributes to formation of Fe-rich stromatolites by (1) intracellularly storing Fe compounds released after death, contributing to the solid material of stromatolites and acting as nucleation sites for precipitation of authigenic Fe minerals, and (2) generating O₂ via photosynthesis that further facilitates precipitation of reduced Fe, any excess O₂ not consumed by Fe precipitation being released to the atmosphere. Recognition of E. mutabilis–dominated biofilm in acidic systems raises a provocative hypothesis relating processes involved in formation of Fe-rich stromatolites by E. mutabilis to those responsible for development of Precambrian stromatolitic Fe formations and oxygenation of the early atmosphere.

Key Words: acid mine drainage • biofilm • precipitates • stromatolites

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