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Benthic Eukaryotic Diversity in the Guaymas Basin Hydrothermal Vent Environment

Virginia P. Edgcomb, David T. Kysela, Andreas Teske, Alvin de Vera Gomez and Mitchell L. Sogin
Proceedings of the National Academy of Sciences of the United States of America
Vol. 99, No. 11 (May 28, 2002), pp. 7658-7662
Stable URL: http://www.jstor.org/stable/3058881
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Benthic Eukaryotic Diversity in the Guaymas Basin Hydrothermal Vent Environment
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Abstract

Molecular microbial ecology studies have revealed remarkable prokaryotic diversity in extreme hydrothermal marine environments. There are no comparable reports of culture-independent surveys of eukaryotic life in warm, anoxic marine sediments. By using sequence comparisons of PCR-amplified small subunit ribosomal RNAs, we characterized eukaryotic diversity in hydrothermal vent environments of Guaymas Basin in the Gulf of California. Many sequences from these anoxic sediments and the overlaying seawater represent previously uncharacterized protists, including early branching eukaryotic lineages or extended diversity within described taxa. At least two mechanisms, with overlapping consequences, account for the eukaryotic community structure of this environment. The adaptation to anoxic environments is evidenced by specific affinity of environmental sequences to aerotolerant anaerobic species in molecular trees. This pattern is superimposed against a background of widely distributed aerophilic and aerotolerant protists, some of which may migrate into and survive in the sediment whereas others (e.g., phototrophs) are simply deposited by sedimentary processes. In contrast, bacterial populations in these sediments are primarily characteristic of anoxic, reduced, hydrocarbon-rich sedimentary habitats.

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