Article
Environmental Sciences
Thomas A. Langer, Kyle D. Zimmer, Brian R. Herwig, William O. Hobbs, James B. Cotner
Summary: Biogeochemistry patterns in shallow lakes are influenced by both in-lake factors and watershed-level factors. The relative importance of these factors is not well understood. A study in Minnesota, USA demonstrated that lake size had the strongest influence on fish δC-13 ratios, while all agriculture in watersheds influenced fish δN-15 ratios. Water column TN and TP concentrations were influenced by the in-lake factor of ecosystem state, with lower concentrations in the clear state. Land use did not have a significant effect on TN or TP concentrations, likely due to the masking effect of ecosystem state.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Shoji D. Thottathil, Yves T. Prairie
Summary: Stable isotopic analysis is a popular method for understanding methane emissions in aquatic environments, yet the lack of concurrent measurements of isotopes and fluxes limits the ability to establish a connection between emission rates and isotopic signatures. Our study on northern temperate lakes found that higher methane emissions were sustained by acetoclastic methanogenesis and correlated strongly with isotopic variability. Further research is needed to account for different emission pathways and their isotopic signature to accurately allocate methane source signature in northern lakes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Chuanqiao Zhou, Muchun Zhou, Ruoyu Jia, Yu Peng, Fenjun Zhao, Runze Xu, Shuoyuan Liang, Akihiko Terada, Guoxiang Wang, Tsuyoshi Kinouchi, Xiaoguang Xu
Summary: Lakes play an important role in methane emissions and particulate organic carbon (POC) production, known as the methane paradox. However, the source of POC during eutrophication and its impact on methane emissions are still unclear. This study investigated 18 shallow lakes with different trophic states to understand the source of POC and its contribution to methane production. The findings suggest that cyanobacteria-derived carbon is a significant source of POC, and the intensified eutrophication increases POC concentration, promoting methane production and emission fluxes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Marttiina Rantala, Rosalie Bruel, Aldo Marchetto, Andrea Lami, Jorge E. Spangenberg, Marie-Elodie Perga
Summary: Our study reveals the broad heterogeneity of lake responses to global change and highlights the importance of hydrogeomorphic context in shaping the sensitivity and responses of lake CO2 to changing nutrient regimes and warming at the regional scale.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
C. Heredia, S. Guedron, D. Point, V Perrot, S. Campillo, C. Verin, M. E. Espinoza, P. Fernandez, C. Duwig, D. Acha
Summary: Cultural eutrophication is a major cause of water quality degradation worldwide. Carbon and nitrogen stable isotopes are simple and integrative tools for evaluating the degree of eutrophication in anthropogenically impacted aquatic ecosystems. The study found that carbon isotopes increased and nitrogen isotopes decreased with distance from the wastewater source in macrophytes and suspended particulate matter. The distribution of aquatic plants on the slope was influenced by both anthropogenic discharges and carbon uptake pathway. A binary mixing model allowed the assessment of anthropogenically derived carbon and nitrogen incorporation in macrophytes. Eutrophication was naturally attenuated within 6 to 8 km from the wastewater source.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Geosciences, Multidisciplinary
T. Klintzsch, H. Geisinger, A. Wieland, G. Langer, G. Nehrke, M. Bizic, M. Greule, K. Lenhart, C. Borsch, M. Schroll, F. Keppler
Summary: Aquatic ecosystems have a significant impact on global methane cycling, with studies showing methane supersaturation in the oxic surface mixed layer (SML) of oceans and epilimnion of lakes. The origin of methane formed under oxygenated conditions is hotly debated, but stable isotope measurements suggest that methane from phytoplankton is distinguishable from methane produced by methanogenic archaea. Comparing laboratory experiments with field measurements, it is suggested that algal and cyanobacterial populations substantially contribute to methane formation in the SML of oceans and lakes.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Jonathan Schenk, Henrique O. Sawakuchi, Anna K. Sieczko, Gustav Pajala, David Rudberg, Emelie Hagberg, Kjell Fors, Hjalmar Laudon, Jan Karlsson, David Bastviken
Summary: Methane plays a crucial role in the carbon cycling of lakes, with methane oxidation serving as a powerful tool to determine whether methane is oxidized or emitted in lakes. In boreal lakes, the δC-13 of methane sources in littoral sediments is consistently higher than that in deep waters, potentially due to variability in organic matter substrates. Additionally, lateral hydrological transport of methane from catchment areas may be an important factor in lake methane cycling.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
F. Juillot, V. Noel, P. Louvat, A. Gelabert, D. Jouvin, J. Goettlicher, S. Belin, B. Mueller, G. Morin, A. Voegelin
Summary: This study traced the speciation and isotopic composition of Zn in the sediments of a freshwater lake that underwent strong eutrophication for one hundred years, in order to assess the potential use of sedimentary Zn isotopes in recording such environmental disturbances. The results showed that the sedimentary Zn isotope signal varied as the lake transitioned from pre-eutrophic to eutrophic conditions. A change in Zn speciation from clay minerals to ZnS was observed, along with a depletion of light Zn in the eutrophic sediments. This is attributed to enhanced biological uptake of light Zn in the water column and subsequent transformation into ZnS during early diagenesis. The study highlights the potential of sedimentary Zn isotopes as indicators of past eutrophic periods in freshwater lakes and their ability to provide insights into paleo-environmental conditions and land use.
Article
Environmental Sciences
Regina Gonzalez Moguel, Adrian M. Bass, Mark H. Garnett, Martin Pilote, Benjamin Keenan, Alex Matveev, Peter M. J. Douglas
Summary: Research shows that organic carbon decomposition from permafrost thawing in lakes and rivers in Northern Quebec can accelerate greenhouse gas emissions, particularly methane ebullition. Different types of water bodies have varying contributions of modern carbon and permafrost carbon, with changes in carbon age observed between winter and summer seasons.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Environmental Sciences
Semra Bakkaloglu, Dave Lowry, Rebecca E. Fisher, Malika Menoud, Mathias Lanoiselle, Huilin Chen, Thomas Rockmann, Euan G. Nisbet
Summary: This study characterizes the carbon isotopic signatures of methane waste sources and explores the use of hydrogen isotopes for waste source identification. The results show distinct signatures for different waste sources, providing valuable information for regional modeling.
ATMOSPHERIC ENVIRONMENT
(2022)
Article
Marine & Freshwater Biology
Alejandra Martel-Cea, Giselle Andrea Astorga, Marjorie Hernandez, Luciano Caputo, Ana Maria Abarzua
Summary: The research findings suggest that air temperature is the most important factor influencing the distribution of chironomids in Araucanian lakes, followed by water temperature and dissolved oxygen. The diversity of chironomids is negatively associated with parameters related to lake productivity. High-altitude lakes are characterized by the presence of Orthocladiinae and Podonominae subfamilies, while lowland lakes are dominated by Chironominae and Tanypodinae.
Review
Astronomy & Astrophysics
Robert W. Sterner
Summary: The Laurentian Great Lakes are complex systems with diverse biogeochemical processes, but our understanding of them is still incomplete. These lakes play a crucial role in supporting millions of people and driving trillions of dollars of economic activity, with biogeochemical changes impacting their functioning.
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES, VOL 49, 2021
(2021)
Article
Ecology
Gregoire Saboret, Dominique Stalder, Blake Matthews, Jakob Brodersen, Carsten Johnny Schubert
Summary: Based on a study of seven perialpine lakes, it was found that the main source of organic carbon in lake food webs is from algae, rather than terrestrial plants. However, a significant portion of organic carbon in fish comes from bacteria. The sources of nitrogen vary among lakes, but the sources of organic carbon are relatively consistent and not strongly influenced by trophic status. This study provides new methods for estimating the source of organic carbon in lake ecosystems.
FRESHWATER BIOLOGY
(2023)
Article
Limnology
Paul W. MacKeigan, Zofia E. Taranu, Frances R. Pick, Beatrix E. Beisner, Irene Gregory-Eaves
Summary: In this study, a 640-lake dataset spanning Canada and 12 ecozones was analyzed to identify the drivers of cyanobacteria blooms. Total phosphorus was found to be the most important predictor of cyanobacterial biomass. Dissolved organic and inorganic carbon and several ions were also significantly associated with cyanobacteria biomass. Surprisingly, cyanobacteria showed a positive relationship with zooplankton biomass, potentially due to localized top-down forces and evolutionary adaptations.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Environmental Sciences
Sarah B. B. Cadieux, Ursel M. E. Schuette, Chris Hemmerich, Sarah Powers, Jeffrey R. R. White
Summary: The study investigated methane cycling in the water column of Arctic lakes and found an unusually efficient methanotrophic community that potentially reduces methane emissions. The isotopic values of methane were highly enriched, and methane concentrations slightly increased at the depth interval with isotope enrichment. The microbial activity within the water column was supported by the increase in temperature and oxidation reduction potential. Understanding the linkages between depth-dependent microbial dynamics and methane biogeochemistry is necessary to assess the sensitivity of the methane cycle to future climate change.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Marine & Freshwater Biology
Ester M. Eckert, Tommaso Cancellario, Paul L. E. Bodelier, Steven A. J. Declerck, Liang Diwen, Sainur Samad, Monika Winder, Libin Zhou, Diego Fontaneto
Summary: This study investigates the factors contributing to the differences in microbiomes associated with rotifers, and finds that host ecology and habitat have a stronger influence than host phylogenetic distances.
Article
Geography, Physical
Ole Bennike, William Colgan, Lars Hedenas, Oliver Heiri, Geoffrey Lemdahl, Peter Wiberg-Larsen, Sofia Ribeiro, Roberto Pronzato, Renata Manconi, Anders A. Bjork
Summary: An organic-rich deposit was discovered at an elevation of 480 m above sea level at the Pingorsuit Glacier in North-West Greenland. The sediments contained remains of vascular plants, mosses, beetles, caddisflies, midges, bryozoans, sponges and other invertebrates. The fossils were deposited in a boreal environment with a mean July air temperature that was at least 9 degrees C higher than at present.
Article
Microbiology
Julia B. Gontijo, Fabiana S. Paula, Andressa M. Venturini, Jessica A. Mandro, Paul L. E. Bodelier, Siu M. Tsai
Summary: This study described the metagenome-assembled genome (MAG) of Methylocystis sp. from Amazonian floodplains sediments and explored its functional potential and ecological traits. The analysis revealed that it belongs to Methylocystis parvus and has the ability for methane oxidation and nitrogen fixation, as well as unique genes related to nitrogen metabolism and cell motility.
Article
Geography, Physical
Fabian Rey, Colin J. Courtney Mustaphi, Sonke Szidat, Erika Gobet, Oliver Heiri, Willy Tinner
Summary: High-resolution chronologies are crucial for comparing palaeoenvironmental studies with high-precision historical, archaeological, or climatic data. The study presents an updated sediment chronology from Burgaschisee, a well-studied lake in Switzerland, using new radiocarbon samples and Bayesian age-depth modeling. The new chronology reveals 2 sigma uncertainties of only +/- 19 years for the entire record and allows for more accurate site-to-site comparisons. The study emphasizes the importance of a rigorous sampling strategy and the selection of suitable terrestrial plant material for radiocarbon dating.
Article
Microbiology
Xiaoyu Cheng, Xing Xiang, Yuan Yun, Weiqi Wang, Hongmei Wang, Paul L. E. Bodelier
Summary: Karst ecosystems, which account for a significant portion of the global land area, have a mismatch between their global importance and the knowledge of their microbial ecology. To bridge this knowledge gap, this study analyzed the microbial communities in different niches of the Heshang Cave and the soils above it. The study found that archaeal communities were dominated by Thaumarchaeota, while Actinobacteria dominated bacterial communities. The important predictor groups inside the cave were correlated to NH4+ availability, while those outside the cave were correlated with pH, Ca2+, and NO2-. The study also identified key keystone taxa involved in nitrogen cycling and revealed the predicted ecological functions in karst soils. Overall, these findings enhance our understanding of the microbial dark matter in subsurface karst ecosystems.
FRONTIERS IN MICROBIOLOGY
(2023)
Editorial Material
Microbiology
Ruo He, Paul L. E. Bodelier, Zhongjun Jia, Peng Xing
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Plant Sciences
Willem O. van der Knaap, Andre F. Lotter, Jacqueline F. N. van Leeuwen
Summary: Pollen and diatoms from the sediment of Hallwilersee in Switzerland over the past six centuries have been analyzed and documented in the ALPADABA database in Neotoma.
VEGETATION HISTORY AND ARCHAEOBOTANY
(2023)
Article
Biotechnology & Applied Microbiology
Vania Scarlet Chavez-Rico, Stijn van den Bergh, Paul L. E. Bodelier, Miriam van Eekert, Yujia Luo, Klaas G. J. Nierop, Valentina Sechi, Adrie Veeken, Cees Buisman
Summary: Process technologies have a significant impact on the characteristics of organic amendments (OAs), even when the same raw material is used. This study aimed to investigate how these process technologies indirectly influence the effect of OAs on soil microbial activity and soil aggregation. The results showed that OAs produced under anaerobic conditions increased microbial activity, biomass, and soil micro-and macro-aggregation compared to compost and control treatments. This study suggests the potential for engineering OAs to achieve desired effects on soil properties.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2023)
Article
Multidisciplinary Sciences
Nare Ngoepe, Moritz Muschick, Mary A. Kishe, Salome Mwaiko, Yunuen Temoltzin-Loranca, Leighton King, Colin Courtney Mustaphi, Oliver Heiri, Giulia Wienhues, Hendrik Vogel, Maria Cuenca-Cambronero, Willy Tinner, Martin Grosjean, Blake Matthews, Ole Seehausen
Summary: Adaptive radiations play a crucial role in generating biodiversity, but the relative importance of species' ecological versatility and arrival order in determining which lineage radiates is still unclear. Through analyzing the fossil record of cichlid fishes in Lake Victoria, it was found that their ecological versatility was key to their persistence in new habitats, suggesting that it played a major role in adaptive radiation.
Article
Geography, Physical
Gonzalo Jimenez-Moreno, Oliver Heiri, Antonio Garcia-Alix, R. Scott Anderson, Francisco J. Jimenez-Espejo, Charo Lopez-Blanco, Laura Jimenez, Carmen Perez-Martinez, Marta Rodrigo-Gamiz, Alejandro Lopez-Aviles, Jon Camuera
Summary: Obtaining accurate temperature reconstructions from the past is crucial in understanding natural temperature changes and evaluating anthropogenic global warming. This study presents a detailed Holocene temperature reconstruction based on chironomid assemblages, revealing significant cooling during the Middle and Late Holocene. The current climate warming exceeds future projections, posing a threat to alpine environments and biodiversity.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Environmental Sciences
Xiaoyu Cheng, Zhilin Zeng, Xiaoyan Liu, Lu Li, Hongmei Wang, Rui Zhao, Paul L. E. Bodelier, Weiqi Wang, Yiheng Wang, Olli H. Tuovinen
Summary: We reported the composition of methane-producing microbial communities and their interactions with methane-oxidizing bacteria (MOBs) in Heshang Cave to comprehensively understand methane cycling in the subsurface biosphere. MOBs were dominated by the high-affinity MOB, upland soil cluster (USC), while methanogens were dominated by Methanoregula and cluster ZC-I. However, MOBs in caves showed a comparable or higher potential methane oxidizing rate (PMOR) than those in soils, while methane produced by methanogens was undetected.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Colin J. Courtney-Mustaphi, Enrica Steiner, Stefanie von Fumetti, Oliver Heiri
Summary: Subfossil remains of aquatic invertebrates found in lacustrine sediments provide valuable information for paleoenvironmental studies. The lack of visual keys or documentation sources has limited the use of certain ecologically important invertebrate groups in paleoenvironmental research. This article presents a collection of digital photomicrographs of pre-identified aquatic invertebrate specimens, showcasing their preserved structures and providing insights for identification.
JOURNAL OF PALEOLIMNOLOGY
(2023)
Article
Geography, Physical
Yunuen Temoltzin-Loranca, Erika Gobet, Boris Vanniere, Jacqueline F. N. van Leeuwen, Giulia Wienhues, Colin Courtney-Mustaphi, Mary Kishe, Moritz Muschick, Leighton King, Pavani Misra, Nare Ngoepe, Blake Matthews, Hendrik Vogel, Oliver Heiri, Ole Seehausen, Martin Grosjean, Willy Tinner
Summary: This paper presents a high-resolution palynological record from the Lake Victoria basin, showing the ecological successions and landscape transformations in tropical East Africa from 16,600 to 9,000 cal yr BP. The study demonstrates the dynamic response of African tropical ecosystems to long-term temperature and humidity variations during this period.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Multidisciplinary Sciences
Nare Ngoepe, Moritz Muschick, Mary A. Kishe, Salome Mwaiko, Yunuen Temoltzin-Loranca, Leighton King, Colin Courtney Mustaphi, Oliver Heiri, Giulia Wienhues, Hendrik Vogel, Maria Cuenca-Cambronero, Willy Tinner, Martin Grosjean, Blake Matthews, Ole Seehausen
Summary: This study presents a continuous fossil record showing how haplochromine cichlids came to dominate the fish fauna of Lake Victoria in Africa.
Article
Environmental Sciences
Stefan Engels, Christine S. Lane, Aritina Haliuc, Wim Z. Hoek, Francesco Muschitiello, Ilaria Baneschi, Annerieke Bouwman, Christopher Bronk Ramsey, James Collins, Renee de Bruijn, Oliver Heiri, Katalin Hubay, Gwydion Jones, Andreas Laug, Josef Merkt, Meike Mueller, Tom Peters, Francien Peterse, Richard A. Staff, Anneke T. M. ter Schure, Falko Turner, Valerie van den Bos, Frederike Wagner-Cremer
Summary: Vegetation in northwest Europe responded instantly and synchronously to abrupt cooling during the last deglaciation, indicating the severity of environmental impact and the sensitivity of natural terrestrial ecosystems to external forcing.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)