Molecular and morphological characterization of cyanobacterial diversity in the stromatolites of highborne cay, bahamas

Jamie S. Foster, Stefan J. Green, Steven R. Ahrendt, Stjepko Golubic, R. Pamela Reid, Kevin L. Hetherington, Lee Bebout

Research output: Contribution to journalArticle

78 Scopus citations

Abstract

Stromatolites are sedimentary deposits that are the direct result of interactions between microbes and their surrounding environment. Once dominant on ancient Earth, actively forming stromatolites now occur in just a few remote locations around the globe, such as the island of Highborne Cay, Bahamas. Although the stromatolites of Highborne Cay contain a wide range of metabolically diverse organisms, photosynthetic cyanobacteria are the driving force for stromatolite development. In this study, we complement previous morphological data by examining the cyanobacterial phylogenetic and physiological diversity of Highborne Cay stromatolites. Molecular analysis of both clone and culture libraries identified 33 distinct phylotypes within the stromatolites. Culture libraries exhibited several morphologically similar but genetically distinct ecotypes, which may contribute to ecosystem stability within the stromatolites. Several of the cultured isolates exhibited both a positive phototactic response and light-dependent extracellular polymeric secretions production, both of which are critical phenotypes for stromatolite accretion and development. The results of this study reveal that the genetic diversity of the cyanobacterial populations within the Highborne Cay stromatolites is far greater than previous estimates, indicating that the mechanisms of stromatolite formation and accretion may be more complex than had been previously assumed.

Original languageEnglish (US)
Pages (from-to)573-587
Number of pages15
JournalISME Journal
Volume3
Issue number5
DOIs
StatePublished - May 1 2009

Keywords

  • Cyanobacteria
  • Microbial diversity
  • Stromatolites

ASJC Scopus subject areas

  • Microbiology
  • Ecology, Evolution, Behavior and Systematics

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