P.M. Gillevet
J. W. Pohlman
M. Sikaroodi
J. Greinert
R.B. Coffin
L.J. Hamdan
2011
<p><span>Sediments from the Porangahau ridge, located off the northeastern coast of New Zealand, were studied to describe bacterial community structure in conjunction with differing biogeochemical regimes across the ridge. Low diversity was observed in sediments from an eroded basin seaward of the ridge and the community was dominated by uncultured members of the </span><i>Burkholderiales. Chloroflexi</i><span>/GNS and </span><i>Deltaproteobacteria</i><span> were abundant in sediments from a methane seep located landward of the ridge. Gas-charged and organic-rich sediments further landward had the highest overall diversity. Surface sediments, with the exception of those from the basin, were dominated by </span><i>Rhodobacterales</i><span> sequences associated with organic matter deposition. Taxa related to the </span><i>Desulfosarcina</i><span>/</span><i>Desulfococcus</i><span> and the JS1 candidates were highly abundant at the sulfate–methane transition zone (SMTZ) at three sites. To determine how community structure was influenced by terrestrial, pelagic and </span><i>in situ</i><span> substrates, sequence data were statistically analyzed against geochemical data (e.g. sulfate, chloride, nitrogen, phosphorous, methane, bulk inorganic and organic carbon pools) using the Biota-Environmental matching procedure. Landward of the ridge, sulfate was among the most significant structuring factors. Seaward of the ridge, silica and ammonium were important structuring factors. Regardless of the transect location, methane was the principal structuring factor on SMTZ communities.</span></p>
application/pdf
10.1111/j.1574-6941.2011.01133.x
en
Oxford Academic
Diversity and biogeochemical structuring of bacterial communities across the Porangahau ridge accretionary prism, New Zealand
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