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International Journal of Biodiversity
Volume 2014, Article ID 152097, 6 pages
http://dx.doi.org/10.1155/2014/152097
Research Article

Diversity of Bacterial Photosymbionts in Lubomirskiidae Sponges from Lake Baikal

Limnological Institute, Siberian Branch of the Russian Academy of Sciences, Ulan-Batorskaya Street 3, Irkutsk 664033, Russia

Received 26 May 2014; Revised 28 October 2014; Accepted 10 November 2014; Published 20 November 2014

Academic Editor: Alexandre Rosado

Copyright © 2014 Nina V. Kulakova et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Sponges are permanent benthos residents which establish complex associations with a variety of microorganisms that raise interest in the nature of sponge-symbionts interactions. A molecular approach, based on the identification of the 16S rRNA and ribulose-1,5-bisphosphate carboxylase/oxygenase large subunit genes, was applied to investigate diversity and phylogeny of bacterial phototrophs associated with four species of Lubomirskiidae in Lake Baikal. The phylogeny inferred from both genes showed three main clusters of Synechococcus associated with Baikalian sponges. One of the clusters belonged to the cosmopolitan Synechococcus rubescens group and the two other were not related to any of the assigned phylogenetic groups but placed as sister clusters to S. rubescens. These results expanded the understanding of freshwater sponge-associated photoautotroph diversity and suggested that the three phylogenetic groups of Synechococcus are common photosynthetic symbionts in Lubomirskiidae sponges.