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Effect of cyanobacterial growth on biotite surfaces under laboratory nutrient-limited conditions

D. Kapitulinová^1,3,*, C. S. Cockell², K. R. Hallam³ and K. V. Ragnarsdottir¹

¹ Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen’s Road, Bristol BS8 1RJ, UK
² CEPSAR, Open University, Milton Keynes MK7 6AA, UK
³ Interface Analysis Centre, University of Bristol, Oldbury House, 121 St. Michael’s Hill, Bristol, BS2 8BS, UK

^* E-mail: dana.kapitulcinova{at}bristol.ac.uk

ABSTRACT

Laboratory experiments with two cyanobacterial strains grown on low-nutrient agar media in the presence of biotite flakes were performed in order to reveal possible mechanisms and rates of cyanobacterial bioweathering. Both cyanobacteria colonized the biotite flakes. Leptolyngbya grew mostly in the biotite interlayers, whereas Hassallia colonized the sides and the topmost surface of the biotite flakes. After a 3-month incubation, rounded features including cyanobacterium-shaped pits were observed on the biotite surface cleared of the organic material. No such features were observed on flakes incubated for 1 month.