Vailulu'u seamount, Samoa: Life and death on an active submarine volcano

Hubert Staudigel, Stanley R. Hart, Adele Pile, Bradley E. Bailey, Edward T. Baker, Sandra Brooke, Douglas P. Connelly, Lisa Haucke, Christopher R. German, Ian Hudson, Daniel Jones, Anthony A.P. Koppers, Jasper Konter, Ray Lee, Theodore W. Pietsch, Bradley M. Tebo, Alexis S. Templeton, Robert Zierenberg, Craig M. Young

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

Submersible exploration of the Samoan hotspot revealed a new, 300-m-tall, volcanic cone, named Nafanua, in the summit crater of Vailulu'u seamount. Nafanua grew from the 1,000-m-deep crater floor in <4 years and could reach the sea surface within decades. Vents fill Vailulu'u crater with a thick suspension of particulates and apparently toxic fluids that mix with seawater entering from the crater breaches. Low-temperature vents form Fe oxide chimneys in many locations and up to 1-m-thick layers of hydrothermal Fe floe on Nafanua. High-temperature (81°C) hydrothermal vents in the northern moat (945-m water depth) produce acidic fluids (pH 2.7) with rising droplets of (probably) liquid CO2. The Nafanua summit vent area is inhabited by a thriving population of eels (Dysommina rugosa) that feed on midwater shrimp probably concentrated by anticyclonic currents at the volcano summit and rim. The moat and crater floor around the new volcano are littered with dead metazoans that apparently died from exposure to hydrothermal emissions. Acid-tolerant polychaetes (Polynoidae) live in this environment, apparently feeding on bacteria from decaying fish carcasses. Vailulu'u is an unpredictable and very active underwater volcano presenting a potential long-term volcanic hazard. Although eels thrive in hydrothermal vents at the summit of Nafanua, venting elsewhere in the crater causes mass mortality. Paradoxically, the same anticyclonic currents that deliver food to the eels may also concentrate a wide variety of nektonic animals in a death trap of toxic hydrothermal fluids.

Original languageEnglish (US)
Pages (from-to)6448-6453
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume103
Issue number17
DOIs
StatePublished - Apr 25 2006

Keywords

  • Currents
  • Eels
  • Habitats hydrothermal
  • Vents

ASJC Scopus subject areas

  • General

Fingerprint Dive into the research topics of 'Vailulu'u seamount, Samoa: Life and death on an active submarine volcano'. Together they form a unique fingerprint.

Cite this