Microbes, macrofauna, and methane: A novel seep community fueled by aerobic methanotrophy Public Deposited

http://ir.library.oregonstate.edu/concern/articles/6m311q89t

This is the publisher’s final pdf. The published article is copyrighted by the Association for the Sciences of Limnology and Oceanography, Inc. and can be found at:  http://www.aslo.org/lo/. This is publication number GEOTECH-2093

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  • During the discovery and description of seven New Zealand methane seep sites, an infaunal assemblage dominated by ampharetid polychaetes was found in association with high seabed methane emission. This ampharetid-bed assemblage had a mean density of 57,000 ± 7800 macrofaunal individuals m⁻² and a maximum wet biomass of 274 g m⁻², both being among the greatest recorded from deep-sea methane seeps. We investigated these questions: Does the species assemblage present within these ampharetid beds form a distinct seep community on the New Zealand margin? and What type of chemoautotrophic microbes fuel this heterotrophic community? Unlike the other macro-infaunal assemblages, the ampharetid-bed assemblage composition was homogeneous, independent of location. Based on a mixing model of species-specific mass and isotopic composition, combined with published respiration measurements, we estimated that this community consumes 29–90 mmol C m⁻² d⁻¹ of methane-fueled biomass; this is > 290 times the carbon fixed by anaerobic methane oxidizers in these ampharetid beds. A fatty acid biomarker approach supported the finding that this community, unlike those previously known, consumes primarily aerobic methanotrophic bacteria. Due to the novel microbial fueling and high methane flux rates, New Zealand’s ampharetid beds provide a model system to study the influence of metazoan grazing on microbially mediated biogeochemical cycles, including those that involve greenhouse gas emissions.
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  • Thurber, A. R., Levin, L. A., Rowden, A. A., Sommer, S., Linke, P., & Kröger, K. (2013). Microbes, macrofauna, and methane: A novel seep community fueled by aerobic methanotrophy. Limnology and Oceanography, 58(5), 1640-1656. doi:10.4319/lo.2013.58.5.1640
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