Gomez-Alvarez V, King GM, Nüsslein K.. Comparative bacterial diversity in recent Hawaiian volcanic deposits of different ages. FEMS Microbiol Ecol 60: 60-73

Department of Microbiology, University of Massachusetts, Amherst, MA 01003, USA.
FEMS Microbiology Ecology (Impact Factor: 3.88). 05/2007; 60(1):60-73. DOI: 10.1111/j.1574-6941.2006.00253.x
Source: PubMed

ABSTRACT Volcanic activity creates new landforms that can change dramatically over time as a consequence of biotic succession. Nonetheless, volcanic deposits present severe constraints for microbial colonization and activity. We have characterized bacterial diversity on four recent deposits at Kilauea volcano, Hawaii (KVD). Much of the diversity was either closely related to uncultured organisms or distinct from any reported 16S rRNA gene sequences. Diversity indices suggested that diversity was highest in a moderately vegetated 210-year-old ash deposit (1790-KVD), and lowest for a 79-year-old lava flow (1921-KVD). Diversity for a 41-year-old tephra deposit (1959-KVD) and a 300-year-old rainforest (1700-KVD) reached intermediate values. The 1959-KVD and 1790-KVD communities were dominated by Acidobacteria, Alpha- and Gammaproteobacteria, Actinobacteria, Cyanobacteria, and many unclassified phylotypes. The 1921-KVD, an unvegetated low pH deposit, was dominated by unclassified phylotypes. In contrast, 1700-KVD was primarily populated by Alphaproteobacteria with very few unclassified phylotypes. Similar diversity indices and levels of trace gas flux were found for 1959-KVD and 1790-KVD; however, statistical analyses indicated significantly different communities. This study not only showed that microorganisms colonize recent volcanic deposits and are able to establish diverse communities, but also that their composition is governed by variations in local deposit parameters.

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Available from: Klaus Nüsslein, Sep 04, 2015
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    • "Cutler et al. (2014) suggested that plant community composition is a significant determinant for fungal communities, but is less relevant for bacterial community composition during long-term changes in soil microbial communities. Bacteria are able to colonize recent volcanic deposits, which can contain numerous unknown bacterial species (Gomez-Alvarez et al. 2007). Various aspects of the structure and function of microbial communities have been studied in recent Hawaiian volcanic deposits (Dunfield and King 2004), and these deposits in particular have been shown to harbor very distinct microbial assemblages. "
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    • "Recent studies of other types of volcanic terrain have also reported novel chemolithotrophic bacteria (Cockell et al. 2009; Gomez-Alvarez et al. 2007; King 2007; Popa et al. 2012; Stott et al. 2008). Acidobacteria, Alpha-and Gammaproteobacteria, Actinobacteria, and Cyanobacteria dominate bacterial communities on volcanic surface terrain in Hawai'i, where composition is controlled by local differences in the environment and nature of the volcanic deposits (Gomez-Alvarez et al. 2007). "
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    • "This results in an increased N-fixation activity in the rhizosphere and a highly efficient share of nutrients between plants and microorganisms. Because of the patchy distribution of C and N concentrations at those sites, many studies have revealed the highest microbial diversity at intermediate stages of ecosystem development by targeting functional genes like nifH (Duc et al., 2009) or general microbial diversity by 16S rRNA gene (Gomez-Alvarez et al., 2007). This fits with the intermediate-disturbance hypothesis, postulating that medium disturbance events cause the highest diversification (Molino & Sabatier, 2001). "
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