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Structures of bacterial communities on the surface of Ulva prolifera and in seawaters in an Ulva blooming region in Jiaozhou Bay, China

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Abstract

Bacterial community structure on the surface of Ulva prolifera thalli and in seawater in an Ulva blooming region in Jiaozhou Bay was investigated by methods of denaturing gradient gel electrophoresis and 16S rDNA clone libraries. Statistical analysis on the clone libraries indicated that bacterial community structure presented no significant differences between two algal samples. Thallus-surface bacterial communities identified by 16S rDNA clone library were dominated by Alteromonadales, Flavobacteriales, and Rhodobacterales. Sequences affiliated with Gammaproteobacteria, Alphaproteobacteria and CFB were detected in all the four seawater samples. However, their different distribution frequencies among the four samples and the presence of some specific bacterial clusters in some samples indicated changes in the bacterial community composition over the course of the bloom. The dominant bacterial clades changed from Alteromonadales and Rickettsiales in A-SW, to Flavobacteriales and Alteromonadales in B-SW, to Alteromonadales and Campylobacterales in C-SW, and to Rickettsiales, Rhodobacterales and Flavobacteriales in D-SW. Some specific dominant bacterial assemblages were present in some seawater samples, such as Campylobacterales in C-SW and Actinobacteria in D-SW. Our results give an insight into the changes in the bacterial community composition in seawater in blooming region during the course of macroalgal Ulva bloom.

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Acknowledgments

We are grateful to Dr. Ian R. Jenkinson (Agency for Consultation and Research in Oceanography, Lavergne) for language improvement. This study was supported by Project of the Ministry of Science and Technology (2008BAC49B01), and NSFC project 40821004.

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Correspondence to Tian Xiao.

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Liu, M., Dong, Y., Zhao, Y. et al. Structures of bacterial communities on the surface of Ulva prolifera and in seawaters in an Ulva blooming region in Jiaozhou Bay, China. World J Microbiol Biotechnol 27, 1703–1712 (2011). https://doi.org/10.1007/s11274-010-0627-9

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