Development of mass blooms of Thiocapsa roseopersicina on sheltered beaches on the Orkney Island

van Gemerden, H., de Wit, R., Tughan, C. S. & Herbert, R. A., Feb-1989, In : FEMS Microbial Ecology. 62, 2, p. 111-118 8 p.

Research output: Contribution to journalArticleAcademicpeer-review

  • H van Gemerden
  • R. de Wit
  • C.S Tughan
  • R.A Herbert
Mass developments of the purple sulfur bacterium Thiocapsa roseopersicina in the surface layers of sandy beaches on the Orkney Islands were examined with respect to microcolony formation on sand grains, vertical distribution of viable cells and the ability to colonize beach surfaces. It was observed that microcolonies of the non-motile phototrophic bacterium cemented individual sand grains to each other and that the resulting aggregates could withstand severe wave action and may play a decisive role in the stabilization of these sandy beaches.
After removal of the top layer similar population densities of T. roseopersicina were recorded within seven days. It was calculated that the net specific growth rate initially was 0.53 day−1 (0.022 h−1).
Laboratory studies strongly suggest that the populations of T. roseopersicina on sheltered beaches on the Orkney Islands were growing phototrophically in the light even when the microenvironment was oxic. Bacteriochlorophyll a synthesis was repressed by oxygen and occurred during periods with low light intensities when the microenvironment was anoxic and contained sulfide
Original languageEnglish
Pages (from-to)111-118
Number of pages8
JournalFEMS Microbial Ecology
Issue number2
Publication statusPublished - Feb-1989

ID: 6248908