Successional Change in Microbial Communities of Benthic Phormidium-Dominated Biofilms
DNA, Bacterial
0301 basic medicine
0303 health sciences
Bacteroidetes
Sequence Analysis, DNA
Eutrophication
15. Life on land
Cyanobacteria
Phylogeography
03 medical and health sciences
Rivers
Biofilms
RNA, Ribosomal, 16S
Biomass
14. Life underwater
Water Microbiology
Ecosystem
Phylogeny
Alphaproteobacteria
New Zealand
DOI:
10.1007/s00248-014-0538-7
Publication Date:
2014-12-02T16:37:16Z
AUTHORS (4)
ABSTRACT
Benthic cyanobacterial blooms are increasing worldwide and can be harmful to human and animal health if they contain toxin-producing species. Microbial interactions are important in the formation of benthic biofilms and can lead to increased dominance and/or toxin production of one or few taxa. This study investigated how microbial interactions contribute to proliferation of benthic blooms dominated by the neurotoxin-producing Phormidium autumnale. Following a rainfall event that cleared the substrate, biofilm succession was characterised at a site on the Hutt River (New Zealand) by sampling every 2-3 days over 32 days. A combination of morphological and molecular community analyses (automated ribosomal intergenic spacer analysis and Illumina™ MiSeq sequencing) identified three distinct phases of succession in both the micro-algal and bacterial communities within P. autumnale-dominated biofilms. Bacterial composition shifted between the phases, and these changes occurred several days before those of the micro-algal community. Alphaproteobacteria and Betaproteobacteria dominate in the early phase; Alphaproteobacteria, Betaproteobacteria, Sphingobacteria and Flavobacteria in the mid-phase; and Sphingobacteria and Flavobacteria in the late phase. Collectively, the results suggest that succession is driven by bacteria in the early stages but becomes dependent on micro-algae in the mid- and late stages of biofilm formation.
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