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. 2015 Jul 7;6:695. doi: 10.3389/fmicb.2015.00695

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Copyright © 2015 Gutierrez, Biddle, Teske and Aitken.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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In situ still photographs of sampling sites during Alvin dives 4567 and 4571, obtained with the Alvin frame-grabber system (http://4dgeo.whoi.edu/alvin). The (Top) image shows the benthic sediment without microbial mats or hydrothermal features sampled during dive 4567; the (Bottom) image shows the microbial mats and sulfur precipitates on the sediment surface that reveal hydrothermal influence. Right, photo of core 4571-2 after shipboard retrieval; the reddish spots are oil droplets in the sediment core.