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5. A shift between mineral and nonmineral sources of iron and sulfur causes proteome-wide changes in Methanosarcina barkeri

Author

Fausset, Hunter, primary, Spietz, Rachel L., additional, Cox, Savannah, additional, Cooper, Gwendolyn, additional, Spurzem, Scott, additional, Tokmina-Lukaszewska, Monika, additional, DuBois, Jennifer, additional, Broderick, Joan B., additional, Shepard, Eric M., additional, Boyd, Eric S., additional, and Bothner, Brian, additional

Published
2024
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15. Biogeochemical evolution of ponded meltwater in a High Arctic subglacial tunnel

Author

Dubnick, Ashley J., Spietz, Rachel L., Danielson, Brad D, Skidmore, Mark L, Boyd, Eric S, Burgess, David, Dhoonmoon, Charvanaa, and Sharp, Martin

Abstract

Subglacial environments comprise ∼10 % of Earth's land surface, host active microbial ecosystems, and are important components of global biogeochemical cycles. However, the broadly inaccessible nature of subglacial systems has left them vastly understudied, and research to date has been limited to laboratory experiments or field measurements using basal ice or subglacial water accessed through boreholes or from the glacier margin. In this study, we extend our understanding of subglacial biogeochemistry and microbiology to include observations of a slushy pond of water that occupied a remnant meltwater channel beneath a polythermal glacier in the Canadian High Arctic over winter. The hydraulics and geochemistry of the system suggest that the pond water originated as late-season, ice-marginal runoff with less than ∼15 % solute contribution from subglacial sources. Over the 8 months of persistent sub-zero regional temperatures, the pond gradually froze, cryo-concentrating solutes in the residual water by up to 7 times. Despite cryo-concentration and the likely influx of some subglacial solute, the pond was depleted in only the most labile and biogeochemically relevant compounds, including ammonium, phosphate, and dissolved organic matter, including a potentially labile tyrosine-like component. DNA amplicon sequencing revealed decreasing microbial diversity with distance into the meltwater channel. The pond at the terminus of the channel hosted a microbial community inherited from late-season meltwater, which was dominated by only six taxa related to known psychrophilic and psychrotolerant heterotrophs that have high metabolic diversity and broad habitat ranges. Collectively, our findings suggest that generalist microbes from the extraglacial or supraglacial environments can become established in subglacial aquatic systems and deplete reservoirs of nutrients and dissolved organic carbon over a period of months. These findings extend our understanding of the microbial and biogeochemical evolution of subglacial aquatic ecosystems and the extent of their habitability.

Published
2023

20. A naturalist perspective of microbiology: Examples from methanogenic archaea.

Author

Boyd, Eric S., Spietz, Rachel L., Kour, Manjinder, and Colman, Daniel R.

Subjects
*NATURALISTS, *ARCHAEBACTERIA, *PRIMARY audience, *STORYTELLING, *MICROBIOLOGY
Abstract

Storytelling has been the primary means of knowledge transfer over human history. The effectiveness and reach of stories are improved when the message is appropriate for the target audience. Oftentimes, the stories that are most well received and recounted are those that have a clear purpose and that are told from a variety of perspectives that touch on the varied interests of the target audience. Whether scientists realize or not, they are accustomed to telling stories of their own scientific discoveries through the preparation of manuscripts, presentations, and lectures. Perhaps less frequently, scientists prepare review articles or book chapters that summarize a body of knowledge on a given subject matter, meant to be more holistic recounts of a body of literature. Yet, by necessity, such summaries are often still narrow in their scope and are told from the perspective of a particular discipline. In other words, interdisciplinary reviews or book chapters tend to be the rarity rather than the norm. Here, we advocate for and highlight the benefits of interdisciplinary perspectives on microbiological subjects. [ABSTRACT FROM AUTHOR]

Published
2023
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