Article
Environmental Sciences
Lien Rodriguez-Lopez, Andrea Lami, Nathalie Fagel, Denisse Alvarez, Lisdelys Gonzalez-Rodriguez, Sabine Schmidt, Roberto Urrutia, Meriam El Ouahabi
Summary: Interactions among climate change, ozone depletion, and ultraviolet radiation have significant impacts on aquatic ecosystems. This study analyzed fossil pigments in a lake in the Chilean Andes over a 60-year period, providing insights into the effects of these interactions on the lake ecosystem.
Review
Oceanography
Mikel Latasa, Francisco Rodriguez, Susana Agusti, Marta Estrada
Summary: A pigment chemotaxonomic approach was used to study the distribution of phytoplankton groups in the oligotrophic tropical and subtropical regions of the Atlantic, Indian, and Pacific oceans. The results showed the presence of a subsurface deep chlorophyll maximum (DCM) in most of the sampling stations, and the composition of phytoplankton populations was relatively stable. Green algae and Prochlorococcus were the major contributors to total chlorophyll, while diatoms and dinoflagellates had lower contributions.
PROGRESS IN OCEANOGRAPHY
(2023)
Article
Environmental Studies
Emilia Arpini, Alexander Panez, Andrew Cumbers, Bethia Pearson
Summary: This article critically examines new municipalism by studying grassroots initiatives in local governments in Argentina and Chile. It suggests that new municipalism needs to consider a broader temporal scope, take into account the longer history of diverse participatory municipal initiatives in the region, and incorporate the concept of territory to understand social transformations in the region.
Article
Environmental Sciences
Sainan Liu, Chenxi Xu, Claudia Fontana, Wenling An, Mario Tomazello-Filho, Qingyu Zhao, Yaru Zhao, Yucheng Liu, Zhengtang Guo
Summary: The South American Summer Monsoon (SASM) plays a crucial role in the climate of South America, and this study used tree ring oxygen isotope data to reconstruct precipitation and understand its relationship with the EI Niño-Southern Oscillation.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Ecology
Judit Boadella, Clara Rodriguez-Baliu, Andrea Butturini, Anna M. M. Romani
Summary: This study aimed to understand the relationship between microbial functioning and dissolved organic matter (DOM) in hypersaline lakes, and how it is affected by daytime and night-time variability. The results revealed that there were larger differences in biofilm microbial activity between surface and subsurface sediments than between day and night, indicating that surface sediments had higher prokaryotic cell density and higher availability of fresh DOM.
FRESHWATER BIOLOGY
(2023)
Article
Environmental Sciences
Wenzhao Xu, Paris D. Collingsworth, Richard Kraus, Barbara Minsker
Summary: A spatio-temporal geostatistical interpolation framework was developed to estimate hypoxia extent using data from a network of DO loggers. The framework was applied to analyze DO dynamics in Lake Erie, demonstrating the ability to capture dynamic nature of bottom hypoxia. The study suggests placing more loggers in nearshore areas to reduce prediction error near the margins of the hypoxic zone.
WATER RESOURCES RESEARCH
(2021)
Article
Multidisciplinary Sciences
Alex Pullen, David L. Barbeau, Andrew L. Leier, Jordan T. Abell, Madison Ward, Austin Bruner, Mary Kate Fidler
Summary: The Tafi del Valle depression in the eastern Andes of Argentina preserves a record of late Pleistocene dust deposition in South America. The study reveals that the sediments in this area were mainly derived from the west and northwest, contradicting previous hypotheses. The findings also indicate the presence of a westerly-northwesterly dominated wind system over the southern Puna Plateau during periods of high dust accumulation.
NATURE COMMUNICATIONS
(2022)
Article
Geochemistry & Geophysics
Jian Yang, Mingxian Han, Beichen Wang, Bingfu Yao, Zenghui Wu, Xinyi Li, Li Liu, Hailiang Dong, Hongchen Jiang
Summary: This study investigated the priming effect (PE) induced by algal and terrestrial grass organic matter under different climate-related factors in lake sediments. The results showed that the intensity and direction of PE were influenced by factors such as salinity, temperature, and organic matter type. Positive PE was more likely to occur in hypersaline lake sediments, while negative PE showed an inverse trend. These findings contribute to our understanding of carbon cycling in lakes under global climate change.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Multidisciplinary Sciences
Marlene Hoehle, Claudia Wrozyna
Summary: Ostracods, a diverse group of microcrustaceans, play an important role in reconstructing paleoenvironmental conditions. However, the limited knowledge about their ecological requirements has led to uncertainties in species distribution and diversity data.
Article
Meteorology & Atmospheric Sciences
Santiago Hurtado, Eduardo A. Agosta
Summary: The study found that precipitation anomalies in eastern subtropical South America are significantly influenced by the El Niño Southern Oscillation, with precipitation mainly modulated by regional tropospheric circulation anomalies during the SONDJ season under El Niño events. However, precipitation anomalies in two atypical seasons were primarily due to shifts in sea surface temperature gradients in the equatorial Pacific and changes in Atlantic basin SST anomalies.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2021)
Article
Multidisciplinary Sciences
Reinaldo Antonio Silva-Sobrinho, Keurilene Sutil Oliveira, Enrique Jorge Deschutter, Marcos Augusto Moraes Arcoverde, Ismael Hoare, Ricardo Izurieta, Adriana Zilly, Maria Luzia Topanotti, Ana Maria de Almeida, Mara Cristina Ripoli Meira, Larissa Djanilda Parra da Luz, Laiz Mangini Cicchelero, Fatima Zimermann
Summary: This study analyzed the spatial association and relative risk of leprosy cases in southern Brazil and the Argentinean province of Misiones from 2010 to 2016. The findings indicate a high probability of similar illness in adjacent areas, as the occurrence of the disease is influenced by neighboring clusters.
Article
Environmental Sciences
Gabriel Ricardo Cifuentes, Juan Jimenez-Millan, Claudia Patricia Quevedo, Antonio Galvez, Jose Castellanos-Rozo, Rosario Jimenez-Espinosa
Summary: The study explored the relationship between trace element concentration in sediments from Sochagota Lake and organic matter content, mineral composition, and bacterial communities activity. Different regions of the lake showed distinct characteristics in terms of element enrichment, suggesting the possible influence of sulfate-reducing bacteria in the precipitation of hydrothermal S and accumulation of trace elements. Additionally, sulfur-oxidizing bacterial communities may play a role in oxidizing previously precipitated sulfide and releasing metals.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Biodiversity Conservation
Carla Kruk, Angel Segura, Gervasio Pineiro, Pablo Baldassini, Laura Perez-Becona, Felipe Garcia-Rodriguez, Gonzalo Perera, Claudia Piccini
Summary: Toxic cyanobacterial blooms are increasing globally due to eutrophication, dam construction, urban waste, cropland expansion, and climate change. This study examined the relationship between cyanobacterial abundance and various drivers in the Uruguay river basin. The results showed that the exponential increase in cyanobacterial abundance since the 2000s was mainly driven by agricultural practices and nutrient enrichment, with negligible effects from precipitation, temperature, and water flow.
GLOBAL CHANGE BIOLOGY
(2023)
Article
Environmental Sciences
Catalina Aguirre, Valentina Flores-Aqueveque, Pablo Vilches, Alicia Vasquez, Jose A. Rutllant, Rene Garreaud
Summary: Recent research has shown significant changes in the number and duration of coastal low-level jet (CLLJ) events off central Chile, with an increase in CLLJ events in the whole study area during winter and a decrease observed at lower latitudes during summer. The changes are attributed to alterations in central pressures and the frequency of extratropical, migratory anticyclones reaching the coast of South America.
Article
Geosciences, Multidisciplinary
Wieslawa Radmacher, Osmin J. Vasquez, Mario Tzalam, Mireya Jolomna, Anny Molineros, James S. Eldrett
Summary: Organic palynological content in rocks is crucial for sediment dating, paleoenvironmental reconstructions, and hydrocarbon potential determination. However, the palynological signal may be affected by various diagenetic processes, leading to the need for further discussion and analysis.
MARINE AND PETROLEUM GEOLOGY
(2021)
Review
Microbiology
Ines Segovia-Campos, Agathe Martignier, Montserrat Filella, Jean-Michel Jaquet, Daniel Ariztegui
Summary: A recently discovered biomineralization process in unicellular eukaryotes and prokaryotic organisms involves intracellular inclusions of amorphous calcium carbonate (ACC) called micropearls, which can be enriched with alkaline-earth metals. The processes, which are not fully understood, involve phylogenetically distant microorganisms.
ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Geography, Physical
Alexander Francke, Jack H. Lacey, Marta Marchegiano, Bernd Wagner, Daniel Ariztegui, Giovanni Zanchetta, Stephanie Kusch, Kristian Ufer, Ilaria Baneschi, Katharina Knodgen
Summary: The study of lake-level fluctuations at Lake Trasimeno reveals a connection with changing aridity in the central Mediterranean, as well as its association with glacial-interglacial climate variability and the intensity of the Atlantic Meridional Overturning Circulation (AMOC). Different phases of the AMOC, such as the Greenland interstadial periods and stadials, as well as variations in the Asian monsoon, are reflected in the lake level changes, indicating wetter or drier conditions in central Italy. Additionally, the transition in hydrological variability at Lake Trasimeno from MIS 3 to the Lateglacial to Holocene transition corresponds to changes in orbital configurations and increasing seasonality with a larger temperature gradient between low- and high-latitude settings.
Article
Geology
Ina Neugebauer, Camille Thomas, Luis Ordonez, Nicolas D. Waldmann, Cristina Recasens, Alexis Vizcaino, Francisco J. Jimenez-Espejo, Daniel Ariztegui
Summary: The study explores the mechanism of laminae formation and preservation in Lago Fagnano, and their relationship with changing redox conditions in the lake. High-resolution sediment geochemical analyses reveal the presence of Fe-oxides, Mn-oxides, and Fe-(mono) sulphides as responsible for the lamination. The study highlights the importance of these analyses in understanding redox and diagenetic processes in oligotrophic mixed lakes.
Article
Geology
Niels S. Brall, Veronique Gardien, Daniel Ariztegui, Philippe Sorrel, Emmanuel Guillerm, Frederic Caupin
Summary: The study reconstructed annual temperature resolution during the onset of Marine Isotope Stage 5e in the Dead Sea Basin using Brillouin spectroscopy on a halite core section. Results indicated a stronger seasonality and colder winters compared to the present-day conditions. This highlights the potential of using cyclic salt deposits to reconstruct seasonal temperature variability in geological records.
DEPOSITIONAL RECORD
(2022)
Article
Geology
Lucia Guerra, Mateo A. Martini, Hendrik Vogel, Eduardo L. Piovano, Irka Hajdas, Ricardo Astini, Antoine De Haller, Andrea Moscariello, Jean-Luc Loizeau, Daniel Ariztegui
Summary: This study analyzed the sediment and stratigraphic records of Laguna La Salada Grande in the central Andes of Northwestern Argentina to explore the paleoenvironmental changes and their causes. The results showed that the lake experienced a phase of deep water with organic matter enrichment since the Late Pleistocene, followed by a highly fluctuating shallower phase with frequent detrital influxes. Irregular high-energy discharge events, possibly triggered by convective atmospheric activity, were observed between 31,000 and 25,000 years ago. Furthermore, the study found a close link between the lake and the paleoclimate changes associated with the South American summer monsoon dynamics.
Article
Geography, Physical
Alexis Vizcaino, Francisco J. Jimenez-Espejo, Robert B. Dunbar, David Mucciarone, Antonio Garcia-Alix, Ina Neugebauer, Daniel Ariztegui
Summary: This study examines past wind variability in Tierra del Fuego, Argentina, which intersects the core of the Southern Hemisphere Westerly Winds. The analysis of a piston core from Bahia Grande reveals periodic changes in oxygen concentration, which are attributed to variations in the Southern Hemisphere Westerly Winds. Additionally, an intensification of El Nino/Southern Oscillation activity is observed during the past 2,000 years.
Article
Chemistry, Analytical
Daniele Strigaro, Massimiliano Cannata, Fabio Lepori, Camilla Capelli, Andrea Lami, Dario Manca, Silvio Seno
Summary: In certain sectors of water resources management, the progress of the digital revolution is hindered by factors such as costs, lack of digital expertise, and resistance to change. This project aims to examine the feasibility of using an open, cost-effective, and replicable digital ecosystem for lake monitoring to address the issue of incomplete integration of information. By utilizing cloud-based technology and an Automatic High-Frequency Monitoring System (AHFM) built with open hardware and software components, the system will be tested and validated in a real-life scenario, integrating historical databases and evaluating the performance of the AHFM system.
Article
Environmental Sciences
Nicoletta Guerrieri, Laura Fantozzi, Andrea Lami, Simona Musazzi, Martina Austoni, Arianna Orru, Laura Marziali, Gigliola Borgonovo, Leonardo Scaglioni
Summary: This article investigates the biofilm in Toce River, Italy, and examines its ability to accumulate metals and macroions from the water. The results show that the biofilm has a seasonal pattern in metal and macroion levels, and can be used as a bioindicator for water quality monitoring.
Article
Environmental Sciences
Michela Rogora, Tommaso Cancellario, Rossana Caroni, Lyudmila Kamburska, Dario Manca, Simona Musazzi, Rocco Tiberti, Andrea Lami
Summary: Lake Maggiore, located in Northern Italy, is a part of the Long-Term Ecosystem Research (LTER) network and has been studied for its physical, chemical, and biological features since the 1980s. In recent years, climate change has become a major factor affecting the lake's long-term evolution. The deployment of a high-frequency monitoring (HFM) system with sensors for limnological variables and algal pigments has provided valuable insight into the lake's quality and ecological changes.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Environmental Sciences
Sanna Atti, Marttiina V. Rantala, Andrea Lami, Carsten Meyer-Jacob, John P. Smol, Jan Weckstrom, Liisa Nevalainen
Summary: The availability of underwater light and exposure to UV radiation in mountain lakes in the Italian Alps are influenced by climate warming and anthropogenic pressures. The acidification caused by human activities decreased the organic carbon concentration in the lakes, leading to increased light availability and UV exposure. The dominant diatom functional groups in the contemporary shallow littoral zones of these lakes are highly tolerant to UV radiation.
JOURNAL OF PALEOLIMNOLOGY
(2023)
Article
Environmental Sciences
Lien Rodriguez-Lopez, Iongel Duran-Llacer, Lisandra Bravo Alvarez, Andrea Lami, Roberto Urrutia
Summary: Phytoplankton and Chlorophyll-a were studied as predictors of lake environmental quality and primary productivity in the Villarrica lacustrine system. LANDSAT images from 2014-2021 were used to predict Chlorophyll-a using the floating algal index and surface algal bloom index. A multiparametric linear model was constructed with these indices and validated with statistical indicators, showing the strength of the model. This study is important as it addresses algal bloom detection through remote sensing for the first time in this Chilean lake.
Article
Environmental Sciences
Lien Rodriguez-Lopez, David Bustos Usta, Lisandra Bravo Alvarez, Iongel Duran-Llacer, Andrea Lami, Rebeca Martinez-Retureta, Roberto Urrutia
Summary: Using machine learning techniques, researchers predicted the water quality of Lake Llanquihue in southern Chile and found that three estimation algorithms (XGBoost, LightGBM, and AdaBoost) performed best.
Article
Green & Sustainable Science & Technology
Nicoletta Guerrieri, Andrea Lami, Simona Musazzi, Martina Austoni, Aldo Marchetto, Arianna Orru, Paola Giacomotti, Gabriele Tartari, Giorgio Lucchini, Leonardo Scaglioni, Gigliola Borgonovo
Summary: This study investigated the biofilms of three streams in the Anzasca Valley located in the Italian Central Alps to understand the effects of arsenic on the aquatic environment. The analysis revealed that the stability of phytobenthic communities varies among different streams, likely due to variations in water composition and the presence of arsenic.
Article
Geosciences, Multidisciplinary
Agathe Martignier, Montserrat Filella, Jean-Michel Jaquet, Mathieu Coster, Daniel Ariztegui
Summary: This study describes intracellular inclusions of amorphous calcium carbonate (ACC) in unicellular organisms and identifies Sr- and Ba-enriched micropearls containing measurable amounts of As. Different types of As-bearing micropearls were found and the chemical composition and sources of micropearls from Lake Geneva and Lake Titicaca were studied.