Unique Geothermal Chemistry Shapes Microbial Communities on Mt. Erebus, Antarctica
Stephen E Noell1,2, Mafalda S Baptista2,3,4, Emily Smith1,2
1Te Aka Mātuatua-School of Science, Te Whare Wānanga o Waikato-University of Waikato, Hamilton, New Zealand.
Frontiers in Microbiology
|May 20, 2022
Summary
Microbial communities in Antarctic Mt. Erebus soils differ significantly, with pH being a key factor. These findings suggest chemolithotrophy is a common strategy in this unique volcanic environment.
Area of Science:
- Geomicrobiology
- Volcanic soil microbiology
- Antarctic extremophiles
Background:
- Mt. Erebus, Antarctica, is the world's southernmost active volcano.
- It possesses unique geothermal systems and is isolated from other major active volcanic systems.
- Understanding microbial life in such extreme environments is crucial.
Purpose of the Study:
- To compare microbial communities and soil composition at two contrasting high-temperature sites on Mt. Erebus.
- To investigate the influence of environmental factors, such as temperature and pH, on microbial diversity.
- To explore potential metabolic strategies, like chemolithotrophy, in this unique ecosystem.
Main Methods:
- 16S rRNA gene amplicon sequencing was employed to analyze microbial communities.
- Physicochemical analyses of soil samples were conducted.
- Samples were collected along thermal gradients at Tramway Ridge and Western Crater, comparing high and low biomass sites.
Main Results:
- Distinct soil compositions and microbial communities were observed between Tramway Ridge and Western Crater.
- Soil pH showed the strongest correlation with microbial community differences, more so than temperature.
- Specific microbial groups, such as Nitrososphaeria and Acidobacteriotal, showed site-specific abundance, while Chloroflexi were detected at both sites.
Conclusions:
- Soil pH is a critical determinant of microbial community structure at Mt. Erebus.
- Chemolithotrophy is predicted to be a prevalent metabolic strategy among the detected microbial groups.
- Further metagenomic and cultivation studies are recommended to fully elucidate the microbial ecology of Mt. Erebus.
More Related Videos
Related Concept Videos
01:21Hyperthermophilic Bacteria
117
Domain Bacteria includes some unique hyperthermophilic species. They exhibit remarkable adaptations that enable survival in extreme environments.Thermotoga species are rod-shaped, gram-negative, non-sporulating hyperthermophiles that form a sheath-like envelope called a toga. They ferment sugars or starch, producing lactate, acetate, CO₂, and H₂, and can also grow via anaerobic respiration using H₂ and ferric iron. Found in hot springs and hydrothermal vents, over 20% of their...
117
01:30Diversity of Archaea I
125
Archaea, a domain of single-celled microorganisms, are classified into five major phyla based on genetic and biochemical characteristics: Euryarchaeota, Crenarchaeota, Thaumarchaeota, Korarchaeota, and Nanoarchaeota. Among these, the phylum Euryarchaeota is notable for its remarkable diversity in morphology, metabolism, and ecological adaptations.Morphological and Metabolic DiversityMembers of Euryarchaeota exhibit a variety of cellular shapes, including rods and cocci. Their metabolic pathways...
125
01:27Diversity of Archaea III
88
Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like...
88
01:29Diversity of Archaea IV
122
Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist...
122
01:27Factors Influencing Microbial Growth: Temperature
290
Microorganisms display remarkable adaptations, enabling them to thrive in diverse ecological niches across a wide range of temperatures. Temperature profoundly influences microbial growth by affecting enzymatic activity, membrane fluidity, and other cellular processes.Each microorganism operates within a specific temperature range defined by three cardinal points: minimum, optimum, and maximum. Below the minimum temperature, membranes lose fluidity, halting transport processes. Above the...
290
01:24Diversity of Archaea II
111
Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
111