Archaeal and bacterial assemblages in the oxygen minimum zone of the upwelling ecosystem off central Chile as determined by organic biomarkers

Benjamín Srain, Julio Sepúlveda, Silvio Pantoja, Roger E. Summons, Renato A. Quiñones, Héctor A. Levipan

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Organic biomarkers were used to investigate the infl uence of seasonal changes in oxygenation and water chemistry on the distribution of archaea and bacteria in the water column and surface sediments of the continental shelf off central Chile (ca. 36°S), an area infl uenced by seasonal upwelling and the development of an oxygen minimum zone. We were interested in establishing if occurrence of archaea and bacteria responds to oxygenation and water chemistry for which we analyzed archaeal isoprenoid (i) and bacterial branched (br) glycerol dialkyl glycerol tetraethers (GDGTs). Our results combined with molecular data from a year round observational program at the same sampling site and depths indicatives the occurrence and dominance of the marine pelagic group Thaumarchaeota. Changes in the distribution of iGDGTs might be explained by (i) the presence of archaeal populations in sub-oxic waters, phylogenetically different from those in surface water, (ii) changes in the relative contribution of Euryarchaeota with depth, and (iii) a relationship between Thaumarchaeota and environmental factors other than temperature. Branched GDGTs were more abundant in the upper, oxic layer during the non-upwelling season, may be a result of higher river runoff, whereas their diversity was higher within sub-oxic waters. Our results indicate a vertical segregation of iGDGTs and brGDGTs, with predominance of archaeal biomarkers during the low productivity season.

Original languageEnglish
Pages (from-to)26-44
Number of pages19
Issue number1
Publication statusPublished - 10 Aug 2015
Externally publishedYes

Bibliographical note

Spanish title: Ensambles de arqueas y bacterias en la zona de mínimo oxígeno del ecosistema de surgencia de Chile central determinados mediante biomarcadores orgánicos

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  • Archaea
  • Bacteria
  • Chile
  • Glycerol dialkyl glycerol tetraethers (GDGTs)
  • Oxygen minimum zone
  • Upwelling


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