Learn More
Five sublacustrine thermal spring locations from 1 to 109 m water depth in Yellowstone Lake were surveyed by 16S ribosomal RNA gene sequencing in relation to their chemical composition and dark CO(2) fixation rates. They harbor distinct chemosynthetic bacterial communities, depending on temperature (16-110°C) and electron donor supply (H(2)S <1 to >100 μM;(More)
Problems in the interpretation of 14C-primary production estimates have resulted from our belief that all carbon compounds are created equal and few attempts have been made to include nighttime 14C-losses. The energetic costs of protein synthesis are high and once formed protein is not simply used as another form of energy but is conserved along food(More)
Analysis of the distribution of 35S-sulfate and 14C-glutamate in major biochemical components of the two marine bacteria, Pseudomonas halodurans and Alteromonas luteo-violaceus, was compared with cell density and total cellular protein during exponential growth in batch culture. For both organisms, the sulfur distribution was restricted principally to the(More)
Lake Michigan, a 58,000-km(2) freshwater inland sea, is large enough to have persistent basin-scale circulation yet small enough to enable development of approximately balanced budgets for water, energy, and elements including carbon and silicon. Introduction of nonindigenous species-whether through invasion, intentional stocking, or accidental(More)
Sulfate concentration in the growth medium exerted a strong influence on the sulfur content of protein in two marine bacteria, Pseudomonas halodurans and Alteromonasluteo-violaceus, but the distribution of sulfur in major biochemical fractions was not affected. 90% of the total cellular sulfur was contained in low molecular weight organic compounds and(More)
Reduced inorganic compounds of geothermal-origin hydrogen sulfide (H 2 S), iron (Fe[II]), and methane (CH 4) were common but not ubiquitous components of hydrothermal vent fluids of Yellowstone Lake at concentrations capable of supporting chemolithoautotrophic (geochemical-oxidizing, carbon dioxide (CO 2)-fixing) bacterial growth. Closely linked to the(More)
Remotely operated vehicle dives on a site of unusual depth-sounder features unveiled a field of stalagmite-like spires of possible hydrothermal origin near the Bridge Bay marina. Fragments collected from the base of several spires were composed of very low-density, porous material resembling siliceous sinter. A National Park Service dive team retrieved a(More)
Yellowstone National Park is well known for its geothermal features. Among microbiologists it is equally well known for its unique microbial ecology and extreme habitats associated with terrestrial hot springs, geysers, and fumaroles. Yellowstone Lake has also been shown to contain geothermal activity, and the presence of hydrothermal vents with water(More)
Geochemical inputs to Yellowstone Lake, Wyoming, come from a variety of sources, including hydrothermal vents, groundwater, rainwater, flux from sediments , and direct runoff. One-third of Yellowstone Lake is directly influenced by hydrothermal activity (hot-water vents and fumaroles). Geothermally heated water percolating through the chamber is highly(More)
The effects of a major storm event (Hurricane Gordon) on the biogeochemistry of Atlantic coastal and Gulf Stream waters were investigated during a research cruise in November 1994. Prestorm, NH , NO , and PO ϩ Ϫ Ϫ 3 4 3 4 concentrations were consistently well below 1 ␮M, whereas after the storm, nutrient concentrations were higher in the surface-water(More)