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Modern stromatolite phototrophic communities: a comparative study of procaryote and eucaryote phototrophs using variable chlorophyll fluorescence
Perkins, R.G.; Mouget, J.L.; Kromkamp, J.C.; Stolz, J.; Reid, R.P. (2012). Modern stromatolite phototrophic communities: a comparative study of procaryote and eucaryote phototrophs using variable chlorophyll fluorescence. FEMS Microbiol. Ecol. 82(3): 584-596. dx.doi.org/10.1111/j.1574-6941.2012.01421.x
In: FEMS Microbiology Ecology. Federation of European Microbiological Societies: Amsterdam. ISSN 0168-6496, more
Peer reviewed article  

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Keywords
Author keywords
    stromatolite; fluorescence; productivity; cyanobacteria; diatoms

Authors  Top 
  • Perkins, R.G.
  • Mouget, J.L.
  • Kromkamp, J.C., more
  • Stolz, J.
  • Reid, R.P.

Abstract
    Stromatolites are laminated organosedimentary structures formed by microbial communities, principally cyanobacteria although eucaryote phototrophs may also be involved in the construction of modern stromatolites. In this study, productivity and photophysiology of communities from stromatolites (laminated) and thrombolites (nonlaminated) were analysed using fluorescence imaging. Sub-samples of mats were excised at Highborne Cay, Bahamas, and cross-sectioned to simultaneously analyse surface, near-surface (12 mm), and deeper (210 mm) communities. Rapid light curve parameters and nonphotochemical downregulation showed distinct differences between phototroph communities, consistent with the reported quasi-succession of classic stromatolite mat types. Greater productivity was shown by cyanobacteria in Type 1 and Type 3 mats (first and final stage of the succession, Schizothrix gebeleinii and Solentia sp. respectively) and lower productivity within Type 2 mats (intermediate mat type). Eucaryote mat types, dominated by stalked (Striatella sp. and Licmophora sp.) and tube-dwelling (e.g. Nitzschia and Navicula spp.) diatoms, showed greater productivity than cyanobacteria communities, with the exception of Striatella (low productivity) and an unidentified coccoid cyanobacterium (high productivity). Findings indicate comparative variability between photosynthetically active procaryote and eucaryote sub-communities within stromatolites, with a pattern logically following the succession of classic mat types, and lower than the productivity of eucaryote dominated nonclassic mat types.

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