Send to:

Choose Destination
See comment in PubMed Commons below
Proc Natl Acad Sci U S A. 2002 Jun 11;99(12):8324-9.

Novel kingdom-level eukaryotic diversity in anoxic environments.

Author information

  • 1Department of Molecular and Cell Biology, 345 LSA Building, University of California, Berkeley, CA 94720, USA.


Molecular evolutionary studies of eukaryotes have relied on a sparse collection of gene sequences that do not represent the full range of eukaryotic diversity in nature. Anaerobic microbes, particularly, have had little representation in phylogenetic studies. Such organisms are the least known of eukaryotes and probably are the most phylogenetically diverse. To provide fresh perspective on the natural diversity of eukaryotes in anoxic environments and also to discover novel sequences for evolutionary studies, we conducted a cultivation-independent, molecular phylogenetic survey of three anoxic sediments, including both freshwater and marine samples. Many previously unrecognized eukaryotes were identified, including representatives of seven lineages that are not specifically related to any known organisms at the kingdom-level and branch below the eukaryotic "crown" radiation of animals, plants, fungi, stramenopiles, etc. The survey additionally identified new sequences characteristic of known ecologically important eukaryotic groups with anaerobic members. Phylogenetic analyses with the new sequences enhance our understanding of the diversity and pattern of eukaryotic evolution.

[PubMed - indexed for MEDLINE]
Free PMC Article

Publication Types, MeSH Terms, Secondary Source ID

Publication Types

MeSH Terms

Secondary Source ID

PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for HighWire Icon for PubMed Central
    Loading ...
    Write to the Help Desk