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Deep-Sea Microbial Eukaryotes in Anoxic, Microoxic, and Sulfidic Environments

  • Virginia P. Edgcomb
  • Joan M. Bernhard
  • Sunok Jeon
Part of the Cellular Origin, Life in Extreme Habitats and Astrobiology book series (COLE, volume 11)

Measuring the extent of eukaryotic microbial diversity is essential to our understanding of eukaryotic evolution and the structure and function of microbial food webs. In the past several years, molecular approaches have been used to address an increasing interest in the diversity of microbial eukaryotes, particularly that of protists from various marine environments. These have included pelagic environments (e.g., Moon-van der Staay et al., 2001; Massana et al., 2002), deep-sea environments (López-García, 2001), the ocean surface (Díez et al., 2001; Moon-van der Staay et al., 2001), coastal environments (Massana et al., 2004), and a river (Berney et al., 2004), as well as extreme environments, including acidic and iron-rich rivers (Amaral Zettler et al., 2002), deep-sea hydrothermal vents (Edgcomb et al., 2002; López-García et al., 2003), microoxic (<10 μM oxygen) and anoxic waters and sediments in salt marshes (Stoeck and Epstein, 2003), permanently anoxic deep-sea waters (Stoeck et al., 2003, 2006), anoxic shallow sediments of marine and freshwater (Dawson and Pace, 2002; Bernhard et al., 2006). These studies have revealed an extraordinary diversity of previously undetected eukaryotic lineages based on small-subunit ribosomal RNA (SSU rRNA) sequences. For a recent overview of higher level classification of eukaryotes that emphasizes the protists, see Adl et al. (2005). Anoxic (lacking dissolved oxygen) environments have been present throughout Earth’s history, and sulfide-rich conditions are likely to have existed in the deep oceans into the late Proterozoic (Canfield, 1998; Shen et al., 2002), during the origin and early diversification of eukaryotes when atmospheric oxygen concentrations were about 1% of present day levels (Schopf and Klein, 1992).

Keywords

Clone Library Hydrothermal Vent Heterotrophic Flagellate Cold Seep Guaymas Basin 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 2007

Authors and Affiliations

  • Virginia P. Edgcomb
    • 1
  • Joan M. Bernhard
    • 1
  • Sunok Jeon
    • 2
    • 3
  1. 1.Department of Geology and GeophysicsWoods Hole Oceanographic InstitutionWoods HoleUSA
  2. 2.Department of BiologyNortheastern UniversityBostonUSA
  3. 3.Department of Environmental ScienceKangwon National UniversityKangwon-DoKorea

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