Microbial Life and Biogeochemistry in Freshwater Hydrothermal Vent Systems

PIs: Carmen Aguilar, Russell Cuhel, Val Klump, James Waples

Yellowstone Lake, WY is located in the caldera of the largest known volcanic eruptions, an area that is well known for its steaming geysers, shimmering thermal pools and bubbling mudpots. Equally relevant, though not visible, are the hydrothermal vents submerged under the northern area of Yellowstone Lake. These vents exist within spatial microbiogeochemical domains, which may mimic conditions of early Earth and perhaps other planets.

The bacteria inhabiting vent systems have access to the reduced minerals and oxidizing agents necessary to support lithotrophic life. Mineral inputs to Yellowstone Lake come from a variety of sources, namely hydrothermal vents, ground water, rain water, flux from sediments and direct runoff (including tributaries). Approximately one third of Yellowstone Lake is directly influenced by hydrothermal activity (hot water vents and fumaroles). Mass balance suggests that microbes play an important part in modifying lake chemistry using vent chemical inputs.

ROV Deployment from USPS Vessel

Using a Remote Operated Vehicle (ROV) with well-developed sampling capabilities, we will sample for water chemistry and microbial populations in underwater hot vents of the Yellowstone Geothermal Ecosystem. We will then conduct microbiological and geochemical analyses aimed at determining the metabolic processes promoting life in the habitats and tolerances of the organisms to extreme conditions. Particular effort will be directed towards elucidating mineral reactants and products of microbial metabolism under the harsh vent water conditions.

Related Article:

Porewater and Hydrothermal Vent Water Inputs to Yellowstone Lake, Wyoming

Related Book:

Yellowstone Lake: Join the Expedition!