Trophic regions of a hydrothermal plume dispersing away from an ultramafic-hosted vent-system: Von Damm vent-site, Mid-Cayman Rise Journal Article


Authors: Bennett, Sarah A.; Coleman, Max; Huber, Julie A.; Reddington, Emily; Kinsey, James C.; McIntyre, Cameron; Seewald, Jeffrey S.; German, Christopher R.
Article Title: Trophic regions of a hydrothermal plume dispersing away from an ultramafic-hosted vent-system: Von Damm vent-site, Mid-Cayman Rise
Abstract: Deep-sea ultramafic-hosted vent systems have the potential to provide large amounts of metabolic energy to both autotrophic and heterotrophic microorganisms in their dispersing hydrothermal plumes. Such vent-systems release large quantities of hydrogen and methane to the water column, both of which can be exploited by autotrophic microorganisms. Carbon cycling in these hydrothermal plumes may, therefore, have an important influence on open-ocean biogeochemistry. In this study, we investigated an ultramafic-hosted system on the Mid-Cayman Rise, emitting metal-poor and hydrogen sulfide-, methane-, and hydrogen-rich hydrothermal fluids. Total organic carbon concentrations in the plume ranged between 42.1 and 51.1 mu M (background = 43.2 +/- 0.7 mu M (n = 5)) and near-field plume samples with elevated methane concentrations imply the presence of chemoautotrophic primary production and in particular methanotrophy. In parts of the plume characterized by persistent potential temperature anomalies but lacking elevated methane concentrations, we found elevated organic carbon concentrations of up to 51.1 mu M, most likely resulting from the presence of heterotrophic communities, their extracellular products and vent larvae. Elevated carbon concentrations up to 47.4 mu M were detected even in far-field plume samples. Within the Von Damm hydrothermal plume, we have used our data to hypothesize a microbial food web in which chemoautotrophy supports a heterotrophic community of microorganisms. Such an active microbial food web would provide a source of labile organic carbon to the deep ocean that should be considered in any future studies evaluating sources and sinks of carbon from hydrothermal venting to the deep ocean.
Keywords: SEA; EAST PACIFIC RISE; CARBON; COMMUNITY STRUCTURE; DISSOLVED ORGANIC-CARBON; WATER COLUMN; MICROORGANISMS; hydrothermal; plume; food web; DE-FUCA RIDGE; SEGMENT; PARTICLE-FLUX; ULTRAMAFIC; GEOCHEMICAL CONSTRAINTS; ATLANTIC RIDGE; ENDEAVOR
Journal Title: Geochemistry Geophysics Geosystems
Volume: 14
Issue: 2
ISSN: 1525-2027
Publisher: American Geophysical Union  
Publication Place: WASHINGTON; 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
Date Published: 2013
Start Page: 317
End Page: 327
DOI/URL:
Notes: PT: J; TC: 0; UT: WOS:000317823900004