Is this you? As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.
Claim your profile
Articles by Jeff R. Havig
Pink snow algae blooms investigated as climate warms
Most guests to Yellowstone National Park visit during the summer, enjoying meadows hosting herds of bison and bounded by dense stands of lodgepole pine, and strolling boardwalks to see thermal features that are teaming with microorganisms thriving in the high temperature water that would cook other forms of life. Fewer guests are able to see the perennial snow fields that persist through the summer at the high elevations in and around the park.
Life thrives under Yellowstone's bleach-white sinters in hydrothermal areas
As one walks along the boardwalks in one of the many hydrothermal areas in Yellowstone National Park, there is a feast for the senses - the rotten egg smell of hydrogen sulfide, the blasting spray of geysers, the bubbling and boiling water in hot springs, the hiss of gas escaping fumaroles, the low thumping of mud pots, and the dazzlingly bright light reflected from white siliceous sinters.
Carbonate bedrock may not alleviate DIC limitation of snow algae - a test of hypothesis in the Medicine Bow Mountains, WY, USA
New Results doi: https://doi.org/10.1101/2023.02.24.529969 Abstract Snow is a critical component of the Earth system. High elevation snow can persist into the melt season and hosts a diverse array of life including snow algae. Due in part to the presence of pigments, snow algae lower albedo and accelerate snow melt which has led to increasing interest in identifying and quantifying the environmental factors that constrain their distribution.
Billions of life forms left us clues from more than a billion years ago – Daily Montanan Original
by Jeff Havig, Daily Montanan September 6, 2022 The geyser cones of Yellowstone are made up of material called sinter—a form of silica precipitated from hot water. When looking at the sinter under a powerful microscope, strange forms are revealed that are related to some of the earliest life forms on Earth.
Billions of life forms left us clues from more than a billion years ago
The geyser cones of Yellowstone are made up of material called sinter—a form of silica precipitated from hot water. When looking at the sinter under a powerful microscope, strange forms are revealed that are related to some of the earliest life forms on Earth.
Where the color runs out: Why some Yellowstone pools have a lot of color, while others don't – Daily Montanan
Sapphire Pool, an alkaline (pH ~7.5) spring in the Biscuit Basin area of the Upper Geyser Basin, Yellowstone National Park. The vent (top image) is hot (~80°C), with white silica precipitating, but as the water cools down the outflow channel the temperature drops below the upper temperature threshold for photosynthesis (~72°C), as indicated by the sudden appearance of bright yellow-green from photosynthetic pigments produced by phototrophic bacteria (bottom image).
Astrobiology | Vol 21, No 1
Request Username Can't sign in? Forgot your username? Enter your email address below and we will send you your username If the address matches an existing account you will receive an email with instructions to retrieve your username
Geochemistry and microbial community composition across a range of acid mine drainage impact and implications for the Neoarchean-Paleoproterozoic transition - Havig - 2017 - Journal of Geophysical Research: Biogeosciences - Wiley Online Library
Streams impacted by acid mine drainage (AMD, also known as acid rock drainage) represent local environmental and ecological disasters; however they may also present an opportunity to study microbial communities in environments analogous to past conditions. Neoarchean continents had streams and rivers replete with detrital pyrites. Following the emergence of oxygenic photosynthesis, Cyanobacteria colonized streams and rivers on continental surfaces.
Show More
loading
Actions
Is this you?
As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.Get in touch with Jeff R.
Contact Jeff R., search articles and posts on X, monitor coverage, and track replies from one place.
Learn more about Muck Rack