Evidence for a chemoautotrophically based food web at inactive hydrothermal vents (Manus Basin)
Hydrothermal vents are ephemeral systems. When venting shuts down, sulfide-dependent taxa die off, and non-vent taxa can colonize the hard substrata. In Manus Basin (Papua New Guinea), where hydrothermally active and inactive sites are interspersed, hydroids, cladorhizid sponges, barnacles, bamboo corals, and other invertebrate types may occupy inactive sites. Carbon and nitrogen isotopic compositions of animals occupying inactive sites are consistent with nutritional dependence on either chemoautotrophically or photosynthetically produced organic material, but sulfur isotopic compositions of these animals point to a chemoautotrophic source of sulfur from dissolved sulfide in vent fluids rather than sulfur derived from seawater sulfate through photosynthesis. Given that suspension-feeding and micro-carnivorous invertebrates are the biomass dominants at inactive sites, the primary source of chemoautotrophic nutrition is likely suspended particulates and organisms delivered from nearby active vents. © 2009 Elsevier Ltd. All rights reserved.
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- Oceanography
- 3708 Oceanography
- 3103 Ecology
- 0602 Ecology
- 0405 Oceanography
- 0402 Geochemistry
Citation
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Oceanography
- 3708 Oceanography
- 3103 Ecology
- 0602 Ecology
- 0405 Oceanography
- 0402 Geochemistry