Articles | Volume 20, issue 11
https://doi.org/10.5194/bg-20-2065-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-20-2065-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
12 Jun 2023
Research article |
| 12 Jun 2023
| 12 Jun 2023
Distributions of bacteriohopanepolyols in lakes and coastal lagoons of the Azores Archipelago
Department of Marine Microbiology & Biogeochemistry, NIOZ Royal
Netherlands Institute for Sea Research, 1790 AB Den Burg, the Netherlands
Department of Earth, Environmental and Planetary Sciences, Brown
University, Providence, RI, USA
Ellen C. Hopmans
Department of Marine Microbiology & Biogeochemistry, NIOZ Royal
Netherlands Institute for Sea Research, 1790 AB Den Burg, the Netherlands
Danica Mitrović
Department of Marine Microbiology & Biogeochemistry, NIOZ Royal
Netherlands Institute for Sea Research, 1790 AB Den Burg, the Netherlands
Pedro M. Raposeiro
Centro de Investigação em Biodiversidade e Recursos
Genéticos, CIBIO, InBIO Laboratório Associado, BIOPOLIS Program in
Genomics, Biodiversity and Land Planning, Polo dos
Açores, Ponta Delgada, Portugal
UNESCO Chair – Land Within Sea: Biodiversity and Sustainability in Atlantic Islands, Departamento de Biologia, Faculdade de Ciências e Tecnologia, Universidade dos Açores,
Ponta Delgada, Açores, Portugal
Vítor Gonçalves
Centro de Investigação em Biodiversidade e Recursos
Genéticos, CIBIO, InBIO Laboratório Associado, BIOPOLIS Program in
Genomics, Biodiversity and Land Planning, Polo dos
Açores, Ponta Delgada, Portugal
UNESCO Chair – Land Within Sea: Biodiversity and Sustainability in Atlantic Islands, Departamento de Biologia, Faculdade de Ciências e Tecnologia, Universidade dos Açores,
Ponta Delgada, Açores, Portugal
Ana C. Costa
Centro de Investigação em Biodiversidade e Recursos
Genéticos, CIBIO, InBIO Laboratório Associado, BIOPOLIS Program in
Genomics, Biodiversity and Land Planning, Polo dos
Açores, Ponta Delgada, Portugal
UNESCO Chair – Land Within Sea: Biodiversity and Sustainability in Atlantic Islands, Departamento de Biologia, Faculdade de Ciências e Tecnologia, Universidade dos Açores,
Ponta Delgada, Açores, Portugal
Linda A. Amaral-Zettler
Department of Marine Microbiology & Biogeochemistry, NIOZ Royal
Netherlands Institute for Sea Research, 1790 AB Den Burg, the Netherlands
Department of Earth, Environmental and Planetary Sciences, Brown
University, Providence, RI, USA
Department of Freshwater and Marine Ecology, Institute for
Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, the
Netherlands
Laura Villanueva
Department of Marine Microbiology & Biogeochemistry, NIOZ Royal
Netherlands Institute for Sea Research, 1790 AB Den Burg, the Netherlands
Department of Earth Sciences, Utrecht University, Utrecht, the
Netherlands
Darci Rush
Department of Marine Microbiology & Biogeochemistry, NIOZ Royal
Netherlands Institute for Sea Research, 1790 AB Den Burg, the Netherlands
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Colleen L. Hoffman, Patrick J. Monreal, Justine B. Albers, Alastair J. M. Lough, Alyson E. Santoro, Travis Mellett, Kristen N. Buck, Alessandro Tagliabue, Maeve C. Lohan, Joseph A. Resing, and Randelle M. Bundy
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Chiara Santinelli, Silvia Valsecchi, Simona Retelletti Brogi, Giancarlo Bachi, Giovanni Checcucci, Mirco Guerrazzi, Elisa Camatti, Stefano Caserini, Arianna Azzellino, and Daniela Basso
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Ocean liming is a technique proposed to mitigate ocean acidification. Every action we take has an impact on the environment and the effects on the invisible world are often overlooked. With this study, we show that lime addition impacts the dynamics of dissolved organic matter, one of the largest reservoirs of carbon on Earth, representing the main source of energy for marine microbes. Further studies to assess the impacts on marine ecosystems are therefore crucial before taking any action.
Mak A. Saito, Jaclyn K. Saunders, Matthew R. McIlvin, Erin M. Bertrand, John A. Breier, Margaret Mars Brisbin, Sophie M. Colston, Jaimee R. Compton, Tim J. Griffin, W. Judson Hervey, Robert L. Hettich, Pratik D. Jagtap, Michael Janech, Rod Johnson, Rick Keil, Hugo Kleikamp, Dagmar Leary, Lennart Martens, J. Scott P. McCain, Eli Moore, Subina Mehta, Dawn M. Moran, Jaqui Neibauer, Benjamin A. Neely, Michael V. Jakuba, Jim Johnson, Megan Duffy, Gerhard J. Herndl, Richard Giannone, Ryan Mueller, Brook L. Nunn, Martin Pabst, Samantha Peters, Andrew Rajczewski, Elden Rowland, Brian Searle, Tim Van Den Bossche, Gary J. Vora, Jacob R. Waldbauer, Haiyan Zheng, and Zihao Zhao
Biogeosciences, 21, 4889–4908, https://doi.org/10.5194/bg-21-4889-2024, https://doi.org/10.5194/bg-21-4889-2024, 2024
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The ability to assess the functional capabilities of microbes in the environment is of increasing interest. Metaproteomics, the ability to measure proteins across microbial populations, has been increasing in capability and popularity in recent years. Here, an international team of scientists conducted an intercomparison study using samples collected from the North Atlantic Ocean and observed consistency in the peptides and proteins identified, their functions, and their taxonomic origins.
Devika Varma, Laura Villanueva, Nicole J. Bale, Pierre Offre, Gert-Jan Reichart, and Stefan Schouten
Biogeosciences, 21, 4875–4888, https://doi.org/10.5194/bg-21-4875-2024, https://doi.org/10.5194/bg-21-4875-2024, 2024
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Archaeal hydroxylated tetraether lipids are increasingly used as temperature indicators in marine settings, but the factors influencing their distribution are still unclear. Analyzing membrane lipids of two thaumarchaeotal strains showed that the growth phase of the cultures does not affect the lipid distribution, but growth temperature profoundly affects the degree of cyclization of these lipids. Also, the abundance of these lipids is species-specific and is not influenced by temperature.
William Kew, Allison Myers-Pigg, Christine H. Chang, Sean M. Colby, Josie Eder, Malak M. Tfaily, Jeffrey Hawkes, Rosalie K. Chu, and James C. Stegen
Biogeosciences, 21, 4665–4679, https://doi.org/10.5194/bg-21-4665-2024, https://doi.org/10.5194/bg-21-4665-2024, 2024
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Natural organic matter (NOM) is often studied via Fourier transform mass spectrometry (FTMS), which identifies organic molecules as mass spectra peaks. The intensity of peaks is data that is often discarded due to technical concerns. We review the theory behind these concerns and show they are supported empirically. However, simulations show that ecological analyses of NOM data that include FTMS peak intensities are often valid. This opens a path for robust use of FTMS peak intensities for NOM.
Evan R. Collins, Troy M. Ferland, Isla S. Castañeda, R. Bernhart Owen, Tim K. Lowenstein, Andrew S. Cohen, Robin W. Renaut, Molly D. O'Beirne, and Josef P. Werne
EGUsphere, https://doi.org/10.5194/egusphere-2024-3006, https://doi.org/10.5194/egusphere-2024-3006, 2024
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Archaeal molecular fossils (tetraethers) have been used around the globe to track changes in climate. Little is known about archaeal response to environmental change in soda lakes, especially lakes influenced by hydrothermal inputs. For the first time in Lake Magadi, we show tetraethers tracking abrupt changes in methane and non-methane producers due to hydrothermal inputs to the lake. This study provides insight into the role of hydrothermal water sources and methane production in soda lakes.
Adam J. Fagan, Tatsuro Tanioka, Alyse A. Larkin, Jenna A. Lee, Nathan S. Garcia, and Adam C. Martiny
Biogeosciences, 21, 4239–4250, https://doi.org/10.5194/bg-21-4239-2024, https://doi.org/10.5194/bg-21-4239-2024, 2024
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Climate change is anticipated to influence the biological pump by altering phytoplankton nutrient distribution. In our research, we collected measurements of particulate matter concentrations during two oceanographic field studies. We observed systematic variations in organic matter concentrations and ratios across the Atlantic Ocean. From statistical modeling, we determined that these variations are associated with differences in the availability of essential nutrients for phytoplankton growth.
Sebastian I. Cantarero, Edgart Flores, Harry Allbrook, Paulina Aguayo, Cristian A. Vargas, John E. Tamanaha, J. Bentley C. Scholz, Lennart T. Bach, Carolin R. Löscher, Ulf Riebesell, Balaji Rajagopalan, Nadia Dildar, and Julio Sepúlveda
Biogeosciences, 21, 3927–3958, https://doi.org/10.5194/bg-21-3927-2024, https://doi.org/10.5194/bg-21-3927-2024, 2024
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Our study explores lipid remodeling in response to environmental stress, specifically how cell membrane chemistry changes. We focus on intact polar lipids in a phytoplankton community exposed to diverse stressors in a mesocosm experiment. The observed remodeling indicates acyl chain recycling for energy storage in intact polar lipids during stress, reallocating resources based on varying growth conditions. This understanding is essential to grasp the system's impact on cellular pools.
Mengke Wang, Peng Zhang, Huishan Li, Guisen Deng, Deliang Kong, Sifang Kong, and Junjian Wang
Biogeosciences, 21, 2691–2704, https://doi.org/10.5194/bg-21-2691-2024, https://doi.org/10.5194/bg-21-2691-2024, 2024
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We developed and applied complementary analyses to characterize molecular-level carbon traits for water-grown and soil-grown fine roots. The adaptive strategy of developing more labile carbon in water-grown roots accelerated root decomposition and counteracted the decelerated effects of anoxia on decomposition, highlighting an indirect effect of environmental change on belowground carbon cycling.
Zhe-Xuan Zhang, Edith Parlanti, Christelle Anquetil, Jérôme Morelle, Anniet M. Laverman, Alexandre Thibault, Elisa Bou, and Arnaud Huguet
Biogeosciences, 21, 2227–2252, https://doi.org/10.5194/bg-21-2227-2024, https://doi.org/10.5194/bg-21-2227-2024, 2024
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Bacterial tetraethers have important implications for palaeoclimate reconstruction. However, fundamental understanding of how these lipids are transformed from land to sea and which environmental factors influence their distributions is lacking. Here, we investigate the sources of brGDGTs and brGMGTs and the factors controlling their distributions in a large dataset (n=237). We propose a novel proxy (RIX) to trace riverine runoff, which is applicable in modern systems and in paleorecord.
Youcheng Bai, Marie-Alexandrine Sicre, Jian Ren, Vincent Klein, Haiyan Jin, and Jianfang Chen
Biogeosciences, 21, 689–709, https://doi.org/10.5194/bg-21-689-2024, https://doi.org/10.5194/bg-21-689-2024, 2024
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Algal biomarkers were used to assess sea ice and pelagic algal production across the western Arctic Ocean with changing sea-ice conditions. They show three distinct areas along with a marked latitudinal gradient of sea ice over pelagic algal production in surface sediments that are reflected by the H-Print index. Our data also show that efficient grazing consumption accounted for the dramatic decrease of diatom-derived biomarkers in sediments compared to that of particulate matter.
Hanxiao Wang, Zhifei Liu, Jiaying Li, Baozhi Lin, Yulong Zhao, Xiaodong Zhang, Junyuan Cao, Jingwen Zhang, Hongzhe Song, and Wenzhuo Wang
Biogeosciences, 20, 5109–5123, https://doi.org/10.5194/bg-20-5109-2023, https://doi.org/10.5194/bg-20-5109-2023, 2023
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The sinking of zooplankton fecal pellets is a key process in the marine biological carbon pump. This study presents carbon export of four shapes of fecal pellets from two time-series sediment traps in the South China Sea. The results show that the sinking fate of fecal pellets is regulated by marine primary productivity, deep-dwelling zooplankton community, and deep-sea currents in the tropical marginal sea, thus providing a new perspective for exploring the carbon cycle in the world ocean.
Rebecca J. Chmiel, Riss M. Kell, Deepa Rao, Dawn M. Moran, Giacomo R. DiTullio, and Mak A. Saito
Biogeosciences, 20, 3997–4027, https://doi.org/10.5194/bg-20-3997-2023, https://doi.org/10.5194/bg-20-3997-2023, 2023
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Cobalt is an important micronutrient for plankton, yet it is often scarce throughout the oceans. A 2017/2018 expedition to coastal Antarctica, including regions of the Amundsen Sea and the Ross Sea, discovered lower concentrations of cobalt compared to two past expeditions in 2005 and 2006, particularly for the type of cobalt preferred as a nutrient by phytoplankton. This loss may be due to changing inputs of other nutrients, causing higher uptake of cobalt by plankton over the last decade.
Emily B. Graham, Hyun-Seob Song, Samantha Grieger, Vanessa A. Garayburu-Caruso, James C. Stegen, Kevin D. Bladon, and Allison N. Myers-Pigg
Biogeosciences, 20, 3449–3457, https://doi.org/10.5194/bg-20-3449-2023, https://doi.org/10.5194/bg-20-3449-2023, 2023
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Intensifying wildfires are increasing pyrogenic organic matter (PyOM) production and its impact on water quality. Recent work indicates that PyOM may have a greater impact on aquatic biogeochemistry than previously assumed, driven by higher bioavailability. We provide a full assessment of the potential bioavailability of PyOM across its chemical spectrum. We indicate that PyOM can be actively transformed within the river corridor and, therefore, may be a growing source of riverine C emissions.
Andrea Scheibe, Carlos A. Sierra, and Marie Spohn
Biogeosciences, 20, 827–838, https://doi.org/10.5194/bg-20-827-2023, https://doi.org/10.5194/bg-20-827-2023, 2023
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We explored carbon cycling in soils in three climate zones in Chile down to a depth of 6 m, using carbon isotopes. Our results show that microbial activity several meters below the soil surface is mostly fueled by recently fixed carbon and that strong decomposition of soil organic matter only occurs in the upper decimeters of the soils. The study shows that different layers of the critical zone are tightly connected and that processes in the deep soil depend on recently fixed carbon.
Melissa Sophia Schwab, Hannah Gies, Chantal Valérie Freymond, Maarten Lupker, Negar Haghipour, and Timothy Ian Eglinton
Biogeosciences, 19, 5591–5616, https://doi.org/10.5194/bg-19-5591-2022, https://doi.org/10.5194/bg-19-5591-2022, 2022
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The majority of river studies focus on headwater or floodplain systems, while often neglecting intermediate river segments. Our study on the subalpine Sihl River bridges the gap between streams and lowlands and demonstrates that moderately steep river segments are areas of significant instream alterations, modulating the export of organic carbon over short distances.
Lisa Noll, Shasha Zhang, Qing Zheng, Yuntao Hu, Florian Hofhansl, and Wolfgang Wanek
Biogeosciences, 19, 5419–5433, https://doi.org/10.5194/bg-19-5419-2022, https://doi.org/10.5194/bg-19-5419-2022, 2022
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Cleavage of proteins to smaller nitrogen compounds allows microorganisms and plants to exploit the largest nitrogen reservoir in soils and is considered the bottleneck in soil organic nitrogen cycling. Results from soils covering a European transect show that protein turnover is constrained by soil geochemistry, shifts in climate and associated alterations in soil weathering and should be considered as a driver of soil nitrogen availability with repercussions on carbon cycle processes.
Muhammed Fatih Sert, Helge Niemann, Eoghan P. Reeves, Mats A. Granskog, Kevin P. Hand, Timo Kekäläinen, Janne Jänis, Pamela E. Rossel, Bénédicte Ferré, Anna Silyakova, and Friederike Gründger
Biogeosciences, 19, 2101–2120, https://doi.org/10.5194/bg-19-2101-2022, https://doi.org/10.5194/bg-19-2101-2022, 2022
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We investigate organic matter composition in the Arctic Ocean water column. We collected seawater samples from sea ice to deep waters at six vertical profiles near an active hydrothermal vent and its plume. In comparison to seawater, we found that the organic matter in waters directly affected by the hydrothermal plume had different chemical composition. We suggest that hydrothermal processes may influence the organic matter distribution in the deep ocean.
Charlotte Haugk, Loeka L. Jongejans, Kai Mangelsdorf, Matthias Fuchs, Olga Ogneva, Juri Palmtag, Gesine Mollenhauer, Paul J. Mann, P. Paul Overduin, Guido Grosse, Tina Sanders, Robyn E. Tuerena, Lutz Schirrmeister, Sebastian Wetterich, Alexander Kizyakov, Cornelia Karger, and Jens Strauss
Biogeosciences, 19, 2079–2094, https://doi.org/10.5194/bg-19-2079-2022, https://doi.org/10.5194/bg-19-2079-2022, 2022
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Buried animal and plant remains (carbon) from the last ice age were freeze-locked in permafrost. At an extremely fast eroding permafrost cliff in the Lena Delta (Siberia), we found this formerly frozen carbon well preserved. Our results show that ongoing degradation releases substantial amounts of this carbon, making it available for future carbon emissions. This mobilisation at the studied cliff and also similarly eroding sites bear the potential to affect rivers and oceans negatively.
Aleksandar I. Goranov, Andrew S. Wozniak, Kyle W. Bostick, Andrew R. Zimmerman, Siddhartha Mitra, and Patrick G. Hatcher
Biogeosciences, 19, 1491–1514, https://doi.org/10.5194/bg-19-1491-2022, https://doi.org/10.5194/bg-19-1491-2022, 2022
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Wildfire-derived molecules are ubiquitous in the aquatic environment, but their biological fate remains understudied. We have evaluated the compositional changes that occur to wildfire-derived molecules after incubation with soil microbes. We observe a significant degradation but also a production of numerous new labile molecules. Our results indicate that wildfire-derived molecules can be broken down and the carbon and nitrogen therein can be incorporated into microbial food webs.
Edgart Flores, Sebastian I. Cantarero, Paula Ruiz-Fernández, Nadia Dildar, Matthias Zabel, Osvaldo Ulloa, and Julio Sepúlveda
Biogeosciences, 19, 1395–1420, https://doi.org/10.5194/bg-19-1395-2022, https://doi.org/10.5194/bg-19-1395-2022, 2022
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In this study, we investigate the chemical diversity and abundance of microbial lipids as markers of organic matter sources in the deepest points of the Atacama Trench sediments and compare them to similar lipid stocks in shallower surface sediments and in the overlying water column. We evaluate possible organic matter provenance and some potential chemical adaptations of the in situ microbial community to the extreme conditions of high hydrostatic pressure in hadal realm.
Birgit Gaye, Niko Lahajnar, Natalie Harms, Sophie Anna Luise Paul, Tim Rixen, and Kay-Christian Emeis
Biogeosciences, 19, 807–830, https://doi.org/10.5194/bg-19-807-2022, https://doi.org/10.5194/bg-19-807-2022, 2022
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Amino acids were analyzed in a large number of samples of particulate and dissolved organic matter from coastal regions and the open ocean. A statistical analysis produced two new biogeochemical indicators. An indicator of sinking particle and sediment degradation (SDI) traces the degradation of organic matter from the surface waters into the sediments. A second indicator shows the residence time of suspended matter in the ocean (RTI).
Zoë R. van Kemenade, Laura Villanueva, Ellen C. Hopmans, Peter Kraal, Harry J. Witte, Jaap S. Sinninghe Damsté, and Darci Rush
Biogeosciences, 19, 201–221, https://doi.org/10.5194/bg-19-201-2022, https://doi.org/10.5194/bg-19-201-2022, 2022
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Anaerobic ammonium oxidation (anammox) is an important nitrogen-removal process in the ocean. We assess the distribution of bacteriohopanetetrol-x (BHT-x), used to trace past anammox, along a redox gradient in the water column of the Benguela upwelling system. BHT-x / BHT ratios of >0.18 correspond to the presence of living anammox bacteria and oxygen levels <50 μmol L−1. This allows for a more robust application of BHT-x to trace past marine anammox and deoxygenation in dynamic marine systems.
Jia-Jang Hung, Ching-Han Tung, Zong-Ying Lin, Yuh-ling Lee Chen, Shao-Hung Peng, Yen-Huei Lin, and Li-Shan Tsai
Biogeosciences, 18, 5141–5162, https://doi.org/10.5194/bg-18-5141-2021, https://doi.org/10.5194/bg-18-5141-2021, 2021
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We report measured active and passive fluxes and their controlling mechanisms in the northern South China Sea (NSCS). The total fluxes were higher than most reports in open oceans, indicating the significance of NSCS in atmospheric CO2 uptake and in storing that CO2 in the ocean’s interior. Winter cooling and extreme events enhanced nutrient availability and elevated fluxes. Global warming may have profound impacts on reducing ocean’s uptake and storage of CO2 in subtropical–tropical oceans.
Jens Daniel Müller, Bernd Schneider, Ulf Gräwe, Peer Fietzek, Marcus Bo Wallin, Anna Rutgersson, Norbert Wasmund, Siegfried Krüger, and Gregor Rehder
Biogeosciences, 18, 4889–4917, https://doi.org/10.5194/bg-18-4889-2021, https://doi.org/10.5194/bg-18-4889-2021, 2021
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Based on profiling pCO2 measurements from a field campaign, we quantify the biomass production of a cyanobacteria bloom in the Baltic Sea, the export of which would foster deep water deoxygenation. We further demonstrate how this biomass production can be accurately reconstructed from long-term surface measurements made on cargo vessels in combination with modelled temperature profiles. This approach enables a better understanding of a severe concern for the Baltic’s good environmental status.
Alexander Braun, Marina Spona-Friedl, Maria Avramov, Martin Elsner, Federico Baltar, Thomas Reinthaler, Gerhard J. Herndl, and Christian Griebler
Biogeosciences, 18, 3689–3700, https://doi.org/10.5194/bg-18-3689-2021, https://doi.org/10.5194/bg-18-3689-2021, 2021
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It is known that CO2 fixation by photoautotrophic organisms is the major sink from the atmosphere. While biologists are aware that CO2 fixation also occurs in heterotrophic organisms, this route of inorganic carbon, and its quantitative role, is hardly recognized in biogeochemistry. We demonstrate that a considerable amount of CO2 is fixed annually through anaplerotic reactions in heterotrophic organisms, and a significant quantity of inorganic carbon is temporally sequestered in biomass.
Jonathan H. Raberg, David J. Harning, Sarah E. Crump, Greg de Wet, Aria Blumm, Sebastian Kopf, Áslaug Geirsdóttir, Gifford H. Miller, and Julio Sepúlveda
Biogeosciences, 18, 3579–3603, https://doi.org/10.5194/bg-18-3579-2021, https://doi.org/10.5194/bg-18-3579-2021, 2021
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BrGDGT lipids are a proxy for temperature in lake sediments, but other parameters like pH can influence them, and seasonality can affect the temperatures they record. We find a warm-season bias at 43 new high-latitude sites. We also present a new method that deconvolves the effects of temperature, pH, and conductivity and generate global calibrations for these variables. Our study provides new paleoclimate tools, insight into brGDGTs at the biochemical level, and a new method for future study.
Charlotte L. Spencer-Jones, Erin L. McClymont, Nicole J. Bale, Ellen C. Hopmans, Stefan Schouten, Juliane Müller, E. Povl Abrahamsen, Claire Allen, Torsten Bickert, Claus-Dieter Hillenbrand, Elaine Mawbey, Victoria Peck, Aleksandra Svalova, and James A. Smith
Biogeosciences, 18, 3485–3504, https://doi.org/10.5194/bg-18-3485-2021, https://doi.org/10.5194/bg-18-3485-2021, 2021
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Long-term ocean temperature records are needed to fully understand the impact of West Antarctic Ice Sheet collapse. Glycerol dialkyl glycerol tetraethers (GDGTs) are powerful tools for reconstructing ocean temperature but can be difficult to apply to the Southern Ocean. Our results show active GDGT synthesis in relatively warm depths of the ocean. This research improves the application of GDGT palaeoceanographic proxies in the Southern Ocean.
Alec W. Armstrong, Leanne Powers, and Michael Gonsior
Biogeosciences, 18, 3367–3390, https://doi.org/10.5194/bg-18-3367-2021, https://doi.org/10.5194/bg-18-3367-2021, 2021
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Living things decay into organic matter, which can dissolve into water (like tea brewing). Tea receives its color by absorbing light. Similarly, this material absorbs light, which can then cause chemical reactions that change it. By measuring changes in these optical properties, we found that materials from some places are more sensitive to light than others. Comparing sensitivity to light helps us understand where these materials come from and what happens as they move through water.
Ben J. Fisher, Johan C. Faust, Oliver W. Moore, Caroline L. Peacock, and Christian März
Biogeosciences, 18, 3409–3419, https://doi.org/10.5194/bg-18-3409-2021, https://doi.org/10.5194/bg-18-3409-2021, 2021
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Organic carbon can be protected from microbial degradation in marine sediments through association with iron minerals on 1000-year timescales. Despite the importance of this carbon sink, our spatial and temporal understanding of iron-bound organic carbon interactions globally is poor. Here we show that caution must be applied when comparing quantification of iron-bound organic carbon extracted by different methods as the extraction strength and method specificity can be highly variable.
Mark A. Stevenson, Suzanne McGowan, Emma J. Pearson, George E. A. Swann, Melanie J. Leng, Vivienne J. Jones, Joseph J. Bailey, Xianyu Huang, and Erika Whiteford
Biogeosciences, 18, 2465–2485, https://doi.org/10.5194/bg-18-2465-2021, https://doi.org/10.5194/bg-18-2465-2021, 2021
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We link detailed stable isotope and biomarker analyses from the catchments of three Arctic upland lakes on Disko Island (West Greenland) to a recent dated sediment core to understand how carbon cycling has changed over the past ~500 years. We find that the carbon deposited in sediments in these upland lakes is predominately sourced from in-lake production due to the catchment's limited terrestrial vegetation and elevation and that recent increases in algal production link with climate change.
Nadine T. Smit, Laura Villanueva, Darci Rush, Fausto Grassa, Caitlyn R. Witkowski, Mira Holzheimer, Adriaan J. Minnaard, Jaap S. Sinninghe Damsté, and Stefan Schouten
Biogeosciences, 18, 1463–1479, https://doi.org/10.5194/bg-18-1463-2021, https://doi.org/10.5194/bg-18-1463-2021, 2021
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Soils from an everlasting fire (gas seep) in Sicily, Italy, reveal high relative abundances of novel uncultivated mycobacteria and unique 13C-depleted mycocerosic acids (multi-methyl branched fatty acids) close to the main gas seep. Our results imply that mycocerosic acids in combination with their depleted δ13C values offer a new biomarker tool to study the role of soil mycobacteria as hydrocarbon consumers in the modern and past global carbon cycle.
Marcus P. S. Badger
Biogeosciences, 18, 1149–1160, https://doi.org/10.5194/bg-18-1149-2021, https://doi.org/10.5194/bg-18-1149-2021, 2021
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Reconstructing ancient atmospheric CO2 is an important aim of palaeoclimate science in order to understand the Earth's climate system. One method, the alkenone proxy based on molecular fossils of coccolithophores, has been recently shown to be ineffective at low-to-moderate CO2 levels. In this paper I show that this is likely due to changes in the biogeochemistry of the coccolithophores when there is low carbon availability, but for much of the Cenozoic the alkenone proxy should have utility.
Loes G. J. van Bree, Francien Peterse, Allix J. Baxter, Wannes De Crop, Sigrid van Grinsven, Laura Villanueva, Dirk Verschuren, and Jaap S. Sinninghe Damsté
Biogeosciences, 17, 5443–5463, https://doi.org/10.5194/bg-17-5443-2020, https://doi.org/10.5194/bg-17-5443-2020, 2020
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Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are used as a paleothermometer based on their temperature dependence in global soils, but aquatic production complicates their use in lakes. BrGDGTs in the water column of Lake Chala, East Africa, respond to oxygen conditions and mixing. Changes in their signal can be linked to bacterial community composition rather than membrane adaptation to changing conditions. Their integrated signal in the sediment reflects mean air temperature.
Alexandra N. Loginova, Andrew W. Dale, Frédéric A. C. Le Moigne, Sören Thomsen, Stefan Sommer, David Clemens, Klaus Wallmann, and Anja Engel
Biogeosciences, 17, 4663–4679, https://doi.org/10.5194/bg-17-4663-2020, https://doi.org/10.5194/bg-17-4663-2020, 2020
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We measured dissolved organic carbon (DOC), nitrogen (DON) and matter (DOM) optical properties in pore waters and near-bottom waters of the eastern tropical South Pacific off Peru. The difference between diffusion-driven and net fluxes of DOC and DON and qualitative changes in DOM optical properties suggested active microbial utilisation of the released DOM at the sediment–water interface. Our results suggest that the sediment release of DOM contributes to microbial processes in the area.
Gerard J. M. Versteegh, Alexander J. P. Houben, and Karin A. F. Zonneveld
Biogeosciences, 17, 3545–3561, https://doi.org/10.5194/bg-17-3545-2020, https://doi.org/10.5194/bg-17-3545-2020, 2020
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Anoxic sediments mostly contain much more organic matter than oxic ones, and therefore organic matter in anoxic settings is often considered to be preserved better than in oxic settings. However, through the analysis of the same fossil dinoflagellate cyst species from both oxic and anoxic settings, we show that at a molecular level the preservation in the oxic sediments may be better since in the anoxic setting the cyst macromolecule has been altered by postdepositional modification.
Jingjing Guo, Miriam Glendell, Jeroen Meersmans, Frédérique Kirkels, Jack J. Middelburg, and Francien Peterse
Biogeosciences, 17, 3183–3201, https://doi.org/10.5194/bg-17-3183-2020, https://doi.org/10.5194/bg-17-3183-2020, 2020
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The fluxes of soil organic carbon (OC) transport from land to sea are poorly constrained, mostly due to the lack of a specific tracer for soil OC. Here we evaluate the use of specific molecules derived from soil bacteria as a tracer for soil OC in a small river catchment. We find that the initial soil signal is lost upon entering the aquatic environment. However, the local environmental history of the catchment is reflected by these molecules in the lake sediments that act as their sink.
Zhuo-Yi Zhu, Joanne Oakes, Bradley Eyre, Youyou Hao, Edwin Sien Aun Sia, Shan Jiang, Moritz Müller, and Jing Zhang
Biogeosciences, 17, 2473–2485, https://doi.org/10.5194/bg-17-2473-2020, https://doi.org/10.5194/bg-17-2473-2020, 2020
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Samples were collected in August 2016 in the Rajang River and its estuary, with tropical forest in the river basin and peatland in the estuary. Organic matter composition was influenced by transportation in the river basin, whereas peatland added clear biodegraded parts to the fluvial organic matter, which implies modification of the initial lability and/or starting points in the subsequent degradation and alternation processes after the organic matter enters the sea.
Wenjie Xiao, Yasong Wang, Yongsheng Liu, Xi Zhang, Linlin Shi, and Yunping Xu
Biogeosciences, 17, 2135–2148, https://doi.org/10.5194/bg-17-2135-2020, https://doi.org/10.5194/bg-17-2135-2020, 2020
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The hadal zone (6–11 km depth) is the least explored habitat on Earth. We studied microbial branched glycerol dialkyl glycerol tetraethers (brGDGTs) in the Challenger Deep, Mariana Trench. One unique feature is the strong predominance of 6-methyl brGDGT, which likely reflects an adaption of brGDGT-producing bacteria to alkaline seawater and low temperature. BrGDGTs, with elemental and isotopic data, suggest an autochthonous product for brGDGT. A new approach is proposed for brGDGT sourcing.
Yuge Bai, Edisson Subdiaga, Stefan B. Haderlein, Heike Knicker, and Andreas Kappler
Biogeosciences, 17, 683–698, https://doi.org/10.5194/bg-17-683-2020, https://doi.org/10.5194/bg-17-683-2020, 2020
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Biogeochemical processes of SOM are key for greenhouse gas emission and water quality. We extracted SOM by water or by NaOH–HCl under oxic–anoxic conditions. Chemical and anoxic extractions lead to higher SOM electron exchange capacities, resulting in stimulation of microbial Fe(III) reduction. Therefore, aqueous pH-neutral SOM extracts should be used to reflect environmental SOM redox processes, and artifacts of chemical extractions need to be considered when evaluating SOM redox processes.
Yan Shen, Volker Thiel, Pablo Suarez-Gonzalez, Sebastiaan W. Rampen, and Joachim Reitner
Biogeosciences, 17, 649–666, https://doi.org/10.5194/bg-17-649-2020, https://doi.org/10.5194/bg-17-649-2020, 2020
Short summary
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Today, sterols are widespread in plants, animals, and fungi but are almost absent in the oldest rocks. Microbial mats, representing the earliest complex ecosystems on Earth, were omnipresent in Precambrian marine environments and may have degraded the sterols at that time. Here we analyze the distribution of sterols through a microbial mat. This provides insight into how variations in biological and nonbiological factors affect the preservation of sterols in modern and ancient microbial mats.
Sarah Coffinet, Travis B. Meador, Lukas Mühlena, Kevin W. Becker, Jan Schröder, Qing-Zeng Zhu, Julius S. Lipp, Verena B. Heuer, Matthew P. Crump, and Kai-Uwe Hinrichs
Biogeosciences, 17, 317–330, https://doi.org/10.5194/bg-17-317-2020, https://doi.org/10.5194/bg-17-317-2020, 2020
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This study deals with two membrane lipids called BDGTs and PDGTs. Membrane lipids are molecules forming the cell envelope of all organisms. Different organisms produce different lipids thus they can be used to detect the presence of specific organisms in the environment. We analyzed the structure of these new lipids and looked for potential producers. We found that they are likely made by microbes emitting methane below the sediment surface and could be used to track these specific microbes.
Ying Wu, Kun Zhu, Jing Zhang, Moritz Müller, Shan Jiang, Aazani Mujahid, Mohd Fakharuddin Muhamad, and Edwin Sien Aun Sia
Biogeosciences, 16, 4517–4533, https://doi.org/10.5194/bg-16-4517-2019, https://doi.org/10.5194/bg-16-4517-2019, 2019
Short summary
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Our understanding of terrestrial organic matter (TOM) in tropical peat-draining rivers remains limited, especially in Southeast Asia. We explored the characteristics of TOM via bulk parameters and lignin phenols of sediment in Malaysia. This showed that the most important plant source of the organic matter in these rivers is woody angiosperm C3 plants with limited diagenetic alteration. This slower degradation of TOM may be a link to higher total nitrogen content, especially for the small river.
Caitlyn R. Witkowski, Sylvain Agostini, Ben P. Harvey, Marcel T. J. van der Meer, Jaap S. Sinninghe Damsté, and Stefan Schouten
Biogeosciences, 16, 4451–4461, https://doi.org/10.5194/bg-16-4451-2019, https://doi.org/10.5194/bg-16-4451-2019, 2019
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Carbon dioxide concentrations (pCO2) in the atmosphere play an integral role in Earth system dynamics, especially climate. Past climates help us understand future ones, but reconstructing pCO2 over the geologic record remains a challenge. This research demonstrates new approaches for exploring past pCO2 via the carbon isotope fractionation in general algal lipids, which we test over a high CO2 gradient from a naturally occurring CO2 seep.
Yongli Zhou, Patrick Martin, and Moritz Müller
Biogeosciences, 16, 2733–2749, https://doi.org/10.5194/bg-16-2733-2019, https://doi.org/10.5194/bg-16-2733-2019, 2019
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We found that peatlands in coastal Sarawak, Borneo, export extremely humified organic matter, which dominates the riverine organic matter pool and conservatively mixes with seawater, while the freshly produced fraction is low and stable in concentration at all salinities. We estimated that terrigenous fractions, which showed high photolability, still account for 20 % of the coastal dissolved organic carbon pool, implying the importance of peat-derived organic matter in the coastal carbon cycle.
Cited articles
Bale, N. J., Rijpstra, W. I. C., Sahonero-Canavesi, D. X., Oshkin, I. Y.,
Belova, S. E., Dedysh, S. N., and Sinninghe Damsté, J. S.: Fatty Acid
and Hopanoid Adaption to Cold in the Methanotroph Methylovulum psychrotolerans, Front.
Microbiol., 10, 589, https://doi.org/10.3389/fmicb.2019.00589, 2019.
Bale, N. J., Ding, S., Hopmans, E. C., Arts, M. G. I., Villanueva, L.,
Boschman, C., Haas, A. F., Schouten, S., and Sinninghe Damsté, J. S.:
Lipidomics of Environmental Microbial Communities, I: Visualization of
Component Distributions Using Untargeted Analysis of High-Resolution Mass
Spectrometry Data, Front. Microbiol., 12, 659302, https://doi.org/10.3389/fmicb.2021.659302, 2021.
Bastviken, D., Cole, J. J., Pace, M. L., and Van de Bogert, M. C.: Fates of
methane from different lake habitats: Connecting whole-lake budgets and
CH4 emissions, J. Geophys. Res.-Biogeo., 113, G2,
https://doi.org/10.1029/2007JG000608, 2008.
Bligh, E. G. and Dyer, W. J.: A rapid method of total lipid extraction and
purification, Can. J. Biochem. Physiol., 37, 911–917,
https://doi.org/10.1139/o59-099, 1959.
Blumenberg, M., Krüger, M., Nauhaus, K., Talbot, H. M., Oppermann, B.
I., Seifert, R., Pape, T., and Michaelis, W.: Biosynthesis of hopanoids by
sulfate-reducing bacteria (genus Desulfovibrio), Environ. Microbiol., 8,
1220–1227, https://doi.org/10.1111/j.1462-2920.2006.01014.x, 2006.
Blumenberg, M., Seifert, R., Kasten, S., Bahlmann, E., and Michaelis, W.:
Euphotic zone bacterioplankton sources major sedimentary
bacteriohopanepolyols in the Holocene Black Sea, Geochim. Cosmochim.
Ac., 73, 750–766, https://doi.org/10.1016/j.gca.2008.11.005, 2009.
Blumenberg, M., Hoppert, M., Krüger, M., Dreier, A., and Thiel, V.:
Novel findings on hopanoid occurrences among sulfate reducing bacteria: Is
there a direct link to nitrogen fixation?, Org. Geochem., 49, 1–5,
https://doi.org/10.1016/j.orggeochem.2012.05.003, 2012.
Blumenberg, M., Berndmeyer, C., Moros, M., Muschalla, M., Schmale, O., and
Thiel, V.: Bacteriohopanepolyols record stratification, nitrogen fixation
and other biogeochemical perturbations in Holocene sediments of the central
Baltic Sea, Biogeosciences, 10, 2725–2735,
https://doi.org/10.5194/bg-10-2725-2013, 2013.
Bradley, A. S., Pearson, A., Sáenz, J. P., and Marx, C. J.:
Adenosylhopane: The first intermediate in hopanoid side chain biosynthesis,
Org. Geochem., 41, 1075–1081,
https://doi.org/10.1016/j.orggeochem.2010.07.003, 2010.
Bravo, J.-M., Perzl, M., Härtner, T., Kannenberg, E. L., and Rohmer, M.:
Novel methylated triterpenoids of the gammacerane series from the
nitrogen-fixing bacterium Bradyrhizobium japonicum USDA 110, Eur. J. Biochem., 268,
1323–1331, https://doi.org/10.1046/j.1432-1327.2001.01998.x, 2001.
Cooke, M. P., Talbot, H. M., and Farrimond, P.: Bacterial populations
recorded in bacteriohopanepolyol distributions in soils from Northern
England, Org. Geochem., 39, 1347–1358,
https://doi.org/10.1016/j.orggeochem.2008.05.003, 2008.
Cooke, M. P., van Dongen, B. E., Talbot, H. M., Semiletov, I., Shakhova, N.,
Guo, L., and Gustafsson, Ö.: Bacteriohopanepolyol biomarker composition
of organic matter exported to the Arctic Ocean by seven of the major Arctic
rivers, Org. Geochem., 40, 1151–1159,
https://doi.org/10.1016/j.orggeochem.2009.07.014, 2009.
Coolen, M. J. L., Talbot, H. M., Abbas, B. A., Ward, C., Schouten, S.,
Volkman, J. K., and Sinninghe Damsté, J. S.: Sources for sedimentary
bacteriohopanepolyols as revealed by 16S rDNA stratigraphy, Environ.
Microbiol., 10, 1783–1803,
https://doi.org/10.1111/j.1462-2920.2008.01601.x, 2008.
Cordeiro, R., Luz, R., Vilaverde, J., Vasconcelos, V., Fonseca, A., and
Gonçalves, V.: Distribution of Toxic Cyanobacteria in Volcanic Lakes of
the Azores Islands, Water, 12, 3385, https://doi.org/10.3390/w12123385,
2020.
Cvejic, J. H., Bodrossy, L., Kovács, K. L., and Rohmer, M.: Bacterial
triterpenoids of the hopane series from the methanotrophic bacteria
Methylocaldum spp.: phylogenetic implications and first evidence for an unsaturated
aminobacteriohopanepolyol, FEMS Microbiol. Lett., 182, 361–365,
https://doi.org/10.1111/j.1574-6968.2000.tb08922.x, 2000.
De Jonge, C., Talbot, H. M., Bischoff, J., Stadnitskaia, A., Cherkashov, G.,
and Sinninghe Damsté, J. S.: Bacteriohopanepolyol distribution in
Yenisei River and Kara Sea suspended particulate matter and sediments traces
terrigenous organic matter input, Geochim. Cosmochim. Ac., 174,
85–101, https://doi.org/10.1016/j.gca.2015.11.008, 2016.
Doðrul Selver, A., Talbot, H. M., Gustafsson, Ö., Boult, S., and van
Dongen, B. E.: Soil organic matter transport along an sub-Arctic river–sea
transect, Org. Geochem., 51, 63–72,
https://doi.org/10.1016/j.orggeochem.2012.08.002, 2012.
Doðrul Selver, A., Sparkes, R. B., Bischoff, J., Talbot, H. M.,
Gustafsson, Ö., Semiletov, I. P., Dudarev, O. V., Boult, S., and van
Dongen, B. E.: Distributions of bacterial and archaeal membrane lipids in
surface sediments reflect differences in input and loss of terrestrial
organic carbon along a cross-shelf Arctic transect, Org. Geochem.,
83/84, 16–26, https://doi.org/10.1016/j.orggeochem.2015.01.005, 2015.
Doughty, D. M., Coleman, M. L., Hunter, R. C., Sessions, A. L., Summons, R.
E., and Newman, D. K.: The RND-family transporter, HpnN, is required for
hopanoid localization to the outer membrane of Rhodopseudomonas palustris TIE-1, P.
Natl. Acad. Sci. USA, 108, E1045–E1051,
https://doi.org/10.1073/pnas.1104209108, 2011.
Elling, F. J., Evans, T. W., Nathan, V., Hemingway, J. D., Kharbush, J. J.,
Bayer, B., Spieck, E., Husain, F., Summons, R. E., and Pearson, A.: Marine
and terrestrial nitrifying bacteria are sources of diverse
bacteriohopanepolyols, Geobiology, 20, 399–420,
https://doi.org/10.1111/gbi.12484, 2022.
Farrimond, P., Head, I. M., and Innes, H. E.: Environmental influence on the
biohopanoid composition of recent sediments, Geochim. Cosmochim.
Ac., 64, 2985–2992, https://doi.org/10.1016/S0016-7037(00)00404-X, 2000.
Gonçalves, V.: Contribuição do estudo das microalgas para a
avaliação da qualidade ecológica das lagoas dos Açores:
fitoplâncton e diatomáceas bentónicas, PhD thesis, University of the Azores,
Ponta Delgada, 343 pp., 2008.
Gonçalves, V., Raposeiro, P. M., Marques, H. S., Vilaverde, J., Balibrea,
A., Rosa, F., Sixto, M., and Costa, A. C.: Monitorização das Massas
de Água Interiores e de Transição da Região Hidrográfica
dos Açores. Relatório Anual do Ano 3 (R5/Ano 3) Ponta Delgada, University of the Azores, 2018.
Guggenheim, C., Freimann, R., Mayr, M. J., Beck, K., Wehrli, B., and
Bürgmann, H.: Environmental and Microbial Interactions Shape
Methane-Oxidizing Bacterial Communities in a Stratified Lake, Front. Microbiol., 11, 579427, https://doi.org/10.3389/fmicb.2020.579427, 2020.
Hanson, R. S.: Ecology and Diversity of Methylotrophic Organisms, in:
Advances in Applied Microbiology, vol. 26, edited by: Perlman, D., Academic
Press, 3–39, https://doi.org/10.1016/S0065-2164(08)70328-9, 1980.
Hanson, R. S. and Hanson, T. E.: Methanotrophic bacteria, Microbiol.
Rev., 60, 439–471, https://doi.org/10.1128/mr.60.2.439-471.1996, 1996.
Harrits, S. M. and Hanson, R. S.: Stratification of aerobic
methane-oxidizing organisms in Lake Mendota, Madison, Wisconsin, Limnol.
Oceanogr., 25, 412–421, https://doi.org/10.4319/lo.1980.25.3.0412,
1980.
Hernández, A., Kutiel, H., Trigo, R. M., Valente, M. A., Sigró, J.,
Cropper, T., and Santo, F. E.: New Azores archipelago daily precipitation
dataset and its links with large-scale modes of climate variability,
Int. J. Climatol., 36, 4439–4454,
https://doi.org/10.1002/joc.4642, 2016.
Hopmans, E. C., Smit, N. T., Schwartz-Narbonne, R., Sinninghe Damsté, J.
S., and Rush, D.: Analysis of non-derivatized bacteriohopanepolyols using
UHPLC-HRMS reveals great structural diversity in environmental lipid
assemblages, Org. Geochem., 160, 104285,
https://doi.org/10.1016/j.orggeochem.2021.104285, 2021.
Kusch, S. and Rush, D.: Revisiting the precursors of the most abundant
natural products on Earth: A look back at 30+ years of
bacteriohopanepolyol (BHP) research and ahead to new frontiers, Org. Geochem., 172, 104469, https://doi.org/10.1016/j.orggeochem.2022.104469,
2022.
Kusch, S., Sepúlveda, J., and Wakeham, S. G.: Origin of Sedimentary BHPs
Along a Mississippi River–Gulf of Mexico Export Transect: Insights From
Spatial and Density Distributions, Front. Mar. Sci., 6, 729, https://doi.org/10.3389/fmars.2019.00729, 2019.
Kusch, S., Wakeham, S. G., Dildar, N., Zhu, C., and Sepúlveda, J.:
Bacterial and archaeal lipids trace chemo(auto)trophy along the redoxcline
in Vancouver Island fjords, Geobiology, 19, 521–541,
https://doi.org/10.1111/gbi.12446, 2021a.
Kusch, S., Wakeham, S. G., and Sepúlveda, J.: Diverse origins of “soil
marker” bacteriohopanepolyols in marine oxygen deficient zones, Org. Geochem., 151, 104150, https://doi.org/10.1016/j.orggeochem.2020.104150,
2021b.
Matys, E. D., Sepúlveda, J., Pantoja, S., Lange, C. B., Caniupán,
M., Lamy, F., and Summons, R. E.: Bacteriohopanepolyols along redox
gradients in the Humboldt Current System off northern Chile, Geobiology, 15,
844–857, https://doi.org/10.1111/gbi.12250, 2017.
Meyers, P. A.: Preservation of elemental and isotopic source identification
of sedimentary organic matter, Chem. Geol., 114, 289–302,
https://doi.org/10.1016/0009-2541(94)90059-0, 1994.
Meyers, P. A.: Applications of organic geochemistry to paleolimnological
reconstructions: a summary of examples from the Laurentian Great Lakes,
Org. Geochem., 34, 261–289,
https://doi.org/10.1016/S0146-6380(02)00168-7, 2003.
Mitrović, D., Hopmans, E. C., Bale, N. J., Richter, N., Amaral-Zettler,
L. A., Baxter, A. J., Peterse, F., Miguel Raposeiro, P., Gonçalves, V.,
Cristina Costa, A., and Schouten, S.: Isoprenoidal GDGTs and GDDs associated
with anoxic lacustrine environments, Org. Geochem., 178, 104582,
https://doi.org/10.1016/j.orggeochem.2023.104582, 2023.
National Center for Biotechnology Information: PubChem Compound Summary for
CID 641496,
1,3-Oxazinan-2-one, https://pubchem.ncbi.nlm.nih.gov/compound/1_3-Oxazinan-2-one, last access: 26 January 2023a.
National Center for Biotechnology Information: PubChem Compound Summary for
CID 123834, 1,3-Dioxan-2-one,
https://pubchem.ncbi.nlm.nih.gov/compound/1_3-Dioxan-2-one,
last access: 26 January 2023b.
Neunlist, S. and Rohmer, M.: A novel hopanoid, 30-(5′-adenosyl)hopane, from
the purple non-sulphur bacterium Rhodopseudomonas acidophila, with possible DNA interactions, Biochem.
J., 228, 769–771, 1985a.
Neunlist, S. and Rohmer, M.: Novel hopanoids from the methylotrophic
bacteria Methylococcus capsulatus and Methylomonas methanica. (22S)-35-aminobacteriohopane-30,31,32,33,34-pentol and
(22S)-35-amino-3β-methylbacteriohopane-30,31,32,33,34-pentol,
Biochem. J., 231, 635–639, https://doi.org/10.1042/bj2310635,
1985b.
Neunlist, S. and Rohmer, M.: The Hopanoids of “Methylosinus trichosporium”: Aminobacteriohopanetriol
and Aminobacteriohopanetetrol, Microbiology, 131, 1363–1367,
https://doi.org/10.1099/00221287-131-6-1363, 1985c.
Neunlist, S., Bisseret, P., and Rohmer, M.: The hopanoids of the purple
non-sulfur bacteria Rhodopseudomonas palustris and Rhodopseudomonas acidophila and the absolute configuration of
bacteriohopanetetrol, Eur. J. Biochem., 171, 245–252,
https://doi.org/10.1111/j.1432-1033.1988.tb13783.x, 1988.
O'Beirne, M. D., Sparkes, R., Hamilton, T. L., van Dongen, B. E., Gilhooly,
W. P., and Werne, J. P.: Characterization of diverse bacteriohopanepolyols
in a permanently stratified, hyper-euxinic lake, Org. Geochem., 168,
104431, https://doi.org/10.1016/j.orggeochem.2022.104431, 2022.
Oksanen, J., Simpson, G., Blanchet, F., Kindt, R., Legendre, P., Minchin,
P., O'Hara, R., Solymos, P., Stevens, M., Szoecs, E., Wagner, H., Barbour,
M., Bedward, M., Bolker, B., Borcard, D., Carvalho, G., Chirico, M., De
Caceres, M., Durand, S., Evangelista, H., FitzJohn, R., Friendly, M.,
Furneaux, B., Hannigan, G., Hill, M., Lahti, L., McGlinn, D., Ouellette, M.,
Ribeiro Cunha, E., Smith, T., Stier, A., Ter Braak C., and Weedon J.:
vegan: Community Ecology Package R package
version 2.6-4,
https://CRAN.R-project.org/package=vegan (last access: 4 May 2023), 2022.
Osborne, K. A.: Environmental controls on bacteriohopanepolyol signatures in
estuarine sediments, Newcastle University, UK, PhD thesis, Newcastle University, http://theses.ncl.ac.uk/jspui/handle/10443/3214 (last access: 4 May 2023), 2015.
Osborne, K. A., Gray, N. D., Sherry, A., Leary, P., Mejeha, O., Bischoff,
J., Rush, D., Sidgwick, F. R., Birgel, D., Kalyuzhnaya, M. G., and Talbot,
H. M.: Methanotroph-derived bacteriohopanepolyol signatures as a function of
temperature related growth, survival, cell death and preservation in the
geological record, Environ. Microbiol. Rep., 9, 492–500,
https://doi.org/10.1111/1758-2229.12570, 2017.
Oswald, K., Milucka, J., Brand, A., Littmann, S., Wehrli, B., Kuypers, M. M.
M., and Schubert, C. J.: Light-Dependent Aerobic Methane Oxidation Reduces
Methane Emissions from Seasonally Stratified Lakes, PLOS ONE, 10, e0132574,
https://doi.org/10.1371/journal.pone.0132574, 2015.
Oswald, K., Milucka, J., Brand, A., Hach, P., Littmann, S., Wehrli, B.,
Kuypers, M. M. M., and Schubert, C. J.: Aerobic gammaproteobacterial
methanotrophs mitigate methane emissions from oxic and anoxic lake waters,
Limnol. Oceanogr., 61, S101–S118,
https://doi.org/10.1002/lno.10312, 2016.
Ourisson, G. and Albrecht, P.: Hopanoids, 1. Geohopanoids: the most abundant
natural products on Earth?, Acc. Chem. Res., 25, 398–402,
https://doi.org/10.1021/ar00021a003, 1992.
Pearson, A., Leavitt, W. D., Sáenz, J. P., Summons, R. E., Tam, M.
C.-M., and Close, H. G.: Diversity of hopanoids and squalene-hopene cyclases
across a tropical land-sea gradient, Environ. Microbiol., 11,
1208–1223, https://doi.org/10.1111/j.1462-2920.2008.01817.x, 2009.
Pereira, C. L., Raposeiro, P. M., Costa, A. C., Bao, R., Giralt, S., and
Gonçalves, V.: Biogeography and lake morphometry drive diatom and
chironomid assemblages' composition in lacustrine surface sediments of
oceanic islands, Hydrobiologia, 730, 93–112,
https://doi.org/10.1007/s10750-014-1824-6, 2014.
R Core Team: R: A language and environment for statistical computing, R Foundation for Statistical Computing, Vienna, Austria, URL https://www.R-project.org/ (last access: 4 May 2023), 2023.
Raposeiro, P. M., Rubio, M. J., González, A., Hernández, A.,
Sánchez-López, G., Vázquez-Loureiro, D., Rull, V., Bao, R.,
Costa, A. C., Gonçalves, V., Sáez, A., and Giralt, S.: Impact of the
historical introduction of exotic fishes on the chironomid community of Lake
Azul (Azores Islands), Palaeogeogr. Palaeocl.,
466, 77–88, https://doi.org/10.1016/j.palaeo.2016.11.015, 2017.
Raposeiro, P. M., Saez, A., Giralt, S., Costa, A. C., and Gonçalves, V.:
Causes of spatial distribution of subfossil diatom and chironomid
assemblages in surface sediments of a remote deep island lake,
Hydrobiologia, 815, 141–163, https://doi.org/10.1007/s10750-018-3557-4,
2018.
Rethemeyer, J., Schubotz, F., Talbot, H. M., Cooke, M. P., Hinrichs, K.-U.,
and Mollenhauer, G.: Distribution of polar membrane lipids in permafrost
soils and sediments of a small high Arctic catchment, Org. Geochem.,
41, 1130–1145, https://doi.org/10.1016/j.orggeochem.2010.06.004, 2010.
Richter, N., Russell, J. M., Amaral-Zettler, L., DeGroff, W., Raposeiro, P.
M., Gonçalves, V., de Boer, E. J., Pla-Rabes, S., Hernández, A.,
Benavente, M., Ritter, C., Sáez, A., Bao, R., Trigo, R. M., Prego, R.,
and Giralt, S.: Long-term hydroclimate variability in the sub-tropical North
Atlantic and anthropogenic impacts on lake ecosystems: A case study from
Flores Island, the Azores, Quaternary Sci. Rev., 285, 107525,
https://doi.org/10.1016/j.quascirev.2022.107525, 2022.
Rohmer, M., Bouvier-Nave, P., and Ourisson, G. 1984: Distribution of
Hopanoid Triterpenes in Prokaryotes, Microbiology, 130, 1137–1150,
https://doi.org/10.1099/00221287-130-5-1137, 1984.
Rudd, J. W. M., Furutani, A., Flett, R. J., and Hamilton, R. D.: Factors
controlling methane oxidation in shield lakes: The role of nitrogen fixation
and oxygen concentration1, Limnol. Oceanogr., 21, 357–364,
https://doi.org/10.4319/lo.1976.21.3.0357, 1976.
Rush, D., Osborne, K. A., Birgel, D., Kappler, A., Hirayama, H., Peckmann,
J., Poulton, S. W., Nickel, J. C., Mangelsdorf, K., Kalyuzhnaya, M.,
Sidgwick, F. R., and Talbot, H. M.: The Bacteriohopanepolyol Inventory of
Novel Aerobic Methane Oxidising Bacteria Reveals New Biomarker Signatures of
Aerobic Methanotrophy in Marine Systems, PLOS ONE, 11, e0165635,
https://doi.org/10.1371/journal.pone.0165635, 2016.
Rush, D., Talbot, H. M., van der Meer, M. T. J., Hopmans, E. C., Douglas,
B., and Sinninghe Damsté, J. S.: Biomarker evidence for the occurrence
of anaerobic ammonium oxidation in the eastern Mediterranean Sea during
Quaternary and Pliocene sapropel formation, Biogeosciences, 16, 2467–2479,
https://doi.org/10.5194/bg-16-2467-2019, 2019.
Sáenz, J. P.: Hopanoid enrichment in a detergent resistant membrane
fraction of Crocosphaera watsonii: Implications for bacterial lipid raft formation, Org. Geochem., 41, 853–856,
https://doi.org/10.1016/j.orggeochem.2010.05.005, 2010.
Sáenz, J. P., Eglinton, T. I., and Summons, R. E.: Abundance and
structural diversity of bacteriohopanepolyols in suspended particulate
matter along a river to ocean transect, Org. Geochem., 42, 774–780,
https://doi.org/10.1016/j.orggeochem.2011.05.006, 2011.
Sáenz, J. P., Sezgin, E., Schwille, P., and Simons, K.: Functional
convergence of hopanoids and sterols in membrane ordering, P. Natl. Acad. Sci. USA, 109, 14236–14240,
https://doi.org/10.1073/pnas.1212141109, 2012.
Santos, F. D., Valente, M. A., Miranda, P. M. A., Aguiar, A., Azevedo, E.
B., Tomé, A. R., and Coelho, F.: Climate change scenarios in the Azores
and Madeira Islands, World Resour. Rev., 16, 473–491, 2004.
Seemann, M., Bisseret, P., Tritz, J.-P., Hooper, A. B., and Rohmer, M.:
Novel bacterial triterpenoids of the hopane series from Nitrosomonas europaea and their
significance for the formation of the C35 bacteriohopane skeleton,
Tetrahedron Lett., 40, 1681–1684,
https://doi.org/10.1016/S0040-4039(99)00064-7, 1999.
Sinninghe Damsté, J. S., Rijpstra, W. I. C., Dedysh, S. N., Foesel, B.
U., and Villanueva, L.: Pheno- and Genotyping of Hopanoid Production in
Acidobacteria, Front. Microbiol., 8, 968, https://doi.org/10.3389/fmicb.2017.00968, 2017.
Spencer-Jones, C. L., Wagner, T., Dinga, B. J., Schefuß, E., Mann, P.
J., Poulsen, J. R., Spencer, R. G. M., Wabakanghanzi, J. N., and Talbot, H.
M.: Bacteriohopanepolyols in tropical soils and sediments from the Congo
River catchment area, Org. Geochem., 89–90, 1–13,
https://doi.org/10.1016/j.orggeochem.2015.09.003, 2015.
Summons, R. E., Jahnke, L. L., Hope, J. M., and Logan, G. A.:
2-Methylhopanoids as biomarkers for cyanobacterial oxygenic photosynthesis,
Nature, 400, 554–557, https://doi.org/10.1038/23005, 1999.
Talbot, H. M. and Farrimond, P.: Bacterial populations recorded in diverse
sedimentary biohopanoid distributions, Org. Geochem., 38, 1212–1225,
https://doi.org/10.1016/j.orggeochem.2007.04.006, 2007.
Talbot, H. M., Watson, D. F., Murrell, J. C., Carter, J. F., and Farrimond,
P.: Analysis of intact bacteriohopanepolyols from methanotrophic bacteria by
reversed-phase high-performance liquid chromatography–atmospheric pressure
chemical ionisation mass spectrometry, J. Chromatogr. A, 921,
175–185, https://doi.org/10.1016/S0021-9673(01)00871-8, 2001.
Talbot, H. M., Watson, D. F., Pearson, E. J., and Farrimond, P.: Diverse
biohopanoid compositions of non-marine sediments, Org. Geochem., 34,
1353–1371, https://doi.org/10.1016/S0146-6380(03)00159-1, 2003.
Talbot, H. M., Rohmer, M., and Farrimond, P.: Rapid structural elucidation
of composite bacterial hopanoids by atmospheric pressure chemical ionisation
liquid chromatography/ion trap mass spectrometry, Rapid Commun.
Mass Sp., 21, 880–892, https://doi.org/10.1002/rcm.2911, 2007.
Talbot, H. M., Summons, R. E., Jahnke, L. L., Cockell, C. S., Rohmer, M.,
and Farrimond, P.: Cyanobacterial bacteriohopanepolyol signatures from
cultures and natural environmental settings, Org. Geochem., 39,
232–263, https://doi.org/10.1016/j.orggeochem.2007.08.006, 2008.
Talbot, H. M., Handley, L., Spencer-Jones, C. L., Dinga, B. J., Schefuß,
E., Mann, P. J., Poulsen, J. R., Spencer, R. G. M., Wabakanghanzi, J. N.,
and Wagner, T.: Variability in aerobic methane oxidation over the past
1.2Myrs recorded in microbial biomarker signatures from Congo fan sediments,
Geochim. Cosmochim. Ac., 133, 387–401,
https://doi.org/10.1016/j.gca.2014.02.035, 2014.
Talbot, H. M., Bischoff, J., Inglis, G. N., Collinson, M. E., and Pancost, R. D.: Polyfunctionalised bio- and geohopanoids in the Eocene Cobham Lignite, Org. Geochem., 96, 77–92, https://doi.org/10.1016/j.orggeochem.2016.03.006, 2016.
Taylor, K. A. and Harvey, H. R.: Bacterial hopanoids as tracers of organic
carbon sources and processing across the western Arctic continental shelf,
Org. Geochem., 42, 487–497,
https://doi.org/10.1016/j.orggeochem.2011.03.012, 2011.
Wagner, T., Kallweit, W., Talbot, H. M., Mollenhauer, G., Boom, A., and
Zabel, M.: Microbial biomarkers support organic carbon transport from
methane-rich Amazon wetlands to the shelf and deep sea fan during recent and
glacial climate conditions, Org. Geochem., 67, 85–98,
https://doi.org/10.1016/j.orggeochem.2013.12.003, 2014.
Watson, D. F. and Farrimond, P.: Novel polyfunctionalised geohopanoids in a
recent lacustrine sediment (Priest Pot, UK), Org. Geochem., 31,
1247–1252, https://doi.org/10.1016/S0146-6380(00)00148-0, 2000.
Welander, P. V. and Summons, R. E.: Discovery, taxonomic distribution, and
phenotypic characterization of a gene required for 3-methylhopanoid
production, P. Natl. Acad. Sci. USA, 109,
12905–12910, https://doi.org/10.1073/pnas.1208255109, 2012.
Welander, P. V., Hunter, R. C., Zhang, L., Sessions, A. L., Summons, R. E.,
and Newman, D. K.: Hopanoids Play a Role in Membrane Integrity and pH
Homeostasis in Rhodopseudomonas palustris TIE-1, J. Bacteriol., 191, 6145–6156,
https://doi.org/10.1128/JB.00460-09, 2009.
Welander, P. V., Coleman, M. L., Sessions, A. L., Summons, R. E., and
Newman, D. K.: Identification of a methylase required for 2-methylhopanoid
production and implications for the interpretation of sedimentary hopanes,
P. Natl. Acad. Sci. USA, 107, 8537–8542,
https://doi.org/10.1073/pnas.0912949107, 2010.
Whittenbury, R., Phillips, K. C., and Wilkinson, J. F.: Enrichment,
Isolation and Some Properties of Methane-utilizing Bacteria, J.
General Microbiol., 61, 205–218,
https://doi.org/10.1099/00221287-61-2-205, 1970.
Wickham, H.: ggplot2: Elegant Graphics for Data Analysis, Springer-Verlag
New York, ISBN 978-3-319-24277-4, https://ggplot2.tidyverse.org (last access: 4 May 2023), 2016.
van Grinsven, S., Sinninghe Damsté, J. S., Harrison, J., and Villanueva,
L.: Impact of Electron Acceptor Availability on Methane-Influenced
Microorganisms in an Enrichment Culture Obtained From a Stratified Lake,
Front. Microbiol., 11, 715, https://doi.org/10.3389/fmicb.2020.00715, 2020.
van Winden, J. F., Talbot, H. M., Kip, N., Reichart, G.-J., Pol, A.,
McNamara, N. P., Jetten, M. S. M., Op den Camp, H. J. M., and Sinninghe
Damsté, J. S.: Bacteriohopanepolyol signatures as markers for
methanotrophic bacteria in peat moss, Geochim. Cosmochim. Ac., 77,
52–61, https://doi.org/10.1016/j.gca.2011.10.026, 2012.
van Winden, J. F., Talbot, H. M., Reichart, G.-J., McNamara, N. P.,
Benthien, A., and Sinninghe Damsté, J. S.: Influence of temperature on
the 13C values and distribution of methanotroph-related hopanoids
in Sphagnum-dominated peat bogs, Geobiology, 18, 497–507,
https://doi.org/10.1111/gbi.12389, 2020.
Wang, M., Carver, J. J., Phelan, V. V., Sanchez, L. M., Garg, N., Peng, Y., Nguyen, D. D., Watrous, J., Kapono, C. A., Luzzatto-Knaan, T., Porto, C., Bouslimani, A., Melnik, A. V., Meehan, M. J., Liu, W.-T., Crüsemann, M., Boudreau, P. D., Esquenazi, E., Sandoval-Calderón, M., Kersten, R. D., Pace, L. A., Quinn, R. A., Duncan, K. R., Hsu, C.-C., Floros, D. J., Gavilan, R. G., Kleigrewe, K., Northen, T., Dutton, R. J., Parrot, D., Carlson, E. E., Aigle, B., Michelsen, C. F., Jelsbak, L., Sohlenkamp, C., Pevzner, P., Edlund, A., McLean, J., Piel, J., Murphy, B. T., Gerwick, L., Liaw, C.-C., Yang, Y.-L., Humpf, H.-U., Maansson, M., Keyzers, R. A., Sims, A. C., Johnson, A. R., Sidebottom, A. M., Sedio, B. E., Klitgaard, A., Larson, C. B., Boya P, C. A., Torres-Mendoza, D., Gonzalez, D. J., Silva, D. B., Marques, L. M., Demarque, D. P., Pociute, E., O’Neill, E. C., Briand, E., Helfrich, E. J. N., Granatosky, E. A., Glukhov, E., Ryffel, F., Houson, H., Mohimani, H., Kharbush, J. J., Zeng, Y., Vorholt, J. A., Kurita, K. L., Charusanti, P., McPhail, K. L., Nielsen, K. F., Vuong, L., Elfeki, M., Traxler, M. F., Engene, N., Koyama, N., Vining, O. B., Baric, R., Silva, R. R., Mascuch, S. J., Tomasi, S., Jenkins, S., Macherla, V., Hoffman, T., Agarwal, V., Williams, P. G., Dai, J., Neupane, R., Gurr, J., Rodríguez, A. M. C., Lamsa, A., Zhang, C., Dorrestein, K., Duggan, B. M., Almaliti, J., Allard, P.-M., et al.: Sharing and community curation of mass spectrometry data with Global Natural Products Social Molecular Networking, Nat Biotechnol, 34, 828–837, https://doi.org/10.1038/nbt.3597, 2016 (data available at https://gnps.ucsd.edu/ProteoSAFe/static/gnps-splash.jsp, last access: 4 May 2023).
Xu, Y., Cooke, M. P., Talbot, H. M., and Simpson, M. J.:
Bacteriohopanepolyol signatures of bacterial populations in Western Canadian
soils, Org. Geochem., 40, 79–86,
https://doi.org/10.1016/j.orggeochem.2008.09.003, 2009.
Zhu, C., Talbot, H. M., Wagner, T., Pan, J.-M., and Pancost, R. D.:
Distribution of hopanoids along a land to sea transect: Implications for
microbial ecology and the use of hopanoids in environmental studies,
Limnol. Oceanogr., 56, 1850–1865,
https://doi.org/10.4319/lo.2011.56.5.1850, 2011.
Zindorf, M., Rush, D., Jaeger, J., Mix, A., Penkrot, M. L., Schnetger, B.,
Sidgwick, F. R., Talbot, H. M., van der Land, C., Wagner, T., Walczak, M.,
and März, C.: Reconstructing oxygen deficiency in the glacial Gulf of
Alaska: Combining biomarkers and trace metals as paleo-redox proxies,
Chem. Geol., 558, 119864,
https://doi.org/10.1016/j.chemgeo.2020.119864, 2020.
Zundel, M. and Rohmer, M.: Prokaryotic triterpenoids, Eur. J.
Biochem., 150, 23–27,
https://doi.org/10.1111/j.1432-1033.1985.tb08980.x, 1985.
Short summary
Bacteriohopanepolyols (BHPs) are a diverse class of lipids produced by bacteria across a wide range of environments. This study characterizes the diversity of BHPs in lakes and coastal lagoons in the Azores Archipelago, as well as a co-culture enriched for methanotrophs. We highlight the potential of BHPs as taxonomic markers for bacteria associated with certain ecological niches, which can be preserved in sedimentary records.
Bacteriohopanepolyols (BHPs) are a diverse class of lipids produced by bacteria across a wide...
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