Article
Geosciences, Multidisciplinary
Frerk Poppelmeier, Marcus Gutjahr, Patrick Blaser, Hartmut Schulz, Finn Suefke, Joerg Lippold
Summary: Research has shown that deep ocean carbon storage increased with limited variations in the past 100,000 years, with northern-sourced water dominating throughout. During Marine Isotope Stage 4, proportions of northern-sourced water even increased by approximately 15% in the Equatorial and Northeast Atlantic, questioning the idea that cold climates promote the expansion of southern-sourced water.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Thiago A. de Sousa, Igor Martins Venancio, Claudio de Morisson Valeriano, Monica Heilbron, Maria T. Weitzel Dias Carneiro, Miguel Angelo Mane, Julio C. Horta de Almeida, Joseph M. Smoak, Ana Luiza S. Albuquerque, Emmanoel Vieira Silva-Filho
Summary: By analyzing the Sr-Nd isotope ratios and REE concentrations in marine sediments, this study unveils the sedimentary provenance of sediments supplied to the continental slope off the coast of northeastern Brazil over the past 130,000 years, with the main source identified as the Parnaiba sedimentary basin. Fluctuations in geochemical ratios and values were found to be influenced by changes in hydrological regime, relative sea-level, intensity of weathering, and displacements of the Intertropical Convergence Zone. The study also suggests that low Sr-87/Sr-86 ratios during glacial periods are likely due to dry conditions, with shifts in rainfall patterns affecting chemical weathering and isotopic fractionation.
Article
Environmental Sciences
J. van Gend, M. L. Francis, A. P. Watson, L. Palcsu, A. Horvath, P. H. Macey, P. le Roux, C. E. Clarke, J. A. Miller
Summary: Namaqualand in South Africa is a global biodiversity hotspot, but local populations face economic challenges due to poor access to water. The study identified sources of salts in groundwater, linking them to marine aerosols and ion-exchange reactions in soils. The research also found that evaporation does not play a major role in salinisation, with groundwater salinity correlating with the presence of heuweltjies in the region.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Xuejing Wang, Yan Zhang, Chunmiao Zheng, Manhua Luo, Shengchao Yu, Meiqing Lu, Hailong Li
Summary: This study in the Guangdong-HongKong-Macao Greater Bay Area in China investigated the impact of both submarine groundwater discharge (SGD) and river discharges on the carbon cycle. It found that SGD and rivers play significant roles in carbon flux, affecting marine carbonate system balance and biological production.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
A. Penaud, F. Eynaud, J. Etourneau, J. Bonnin, A. de Vernal, S. Zaragosi, J-H Kim, S. Kang, J-K Gal, D. Oliveira, C. Waelbroeck
Summary: The study reconstructs changes in ocean primary productivity in the Gulf of Cadiz over the past 50,000 years using various methods and data sources, providing insights into the relationship between productivity, carbon export, and remineralization. The research highlights the link between upwelling dynamics and periods of enhanced primary productivity, with a particular focus on the distinct characteristics during the Last Glacial Maximum.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2022)
Article
Environmental Sciences
Julieta Galliari, Lucia Santucci, Lucas Misseri, Eleonora Carol, Maria del Pilar Alvarez
Summary: The study conducted a comparative analysis of groundwater salinity in coastal wetlands of four natural reserves in Argentina, finding an increase in salinity along a latitudinal gradient. The results showed that the ionic contents in groundwater were partially controlled by the salinity of tidal flood water, with the southern wetlands experiencing a significant increase in groundwater ionic concentrations.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Gael Alory, Casimir Yelognisse Da-Allada, Sandrine Djakoure, Isabelle Dadou, Julien Jouanno, Dorelle Prudence Loemba
Summary: The study found that the Niger River plume only contributes 20% to the limitation of the northeast Gulf of Guinea upwelling, mainly due to its shallow plume and limited impact on coastal temperature and salinity. The river-induced mixed-layer thinning compensates the current increase, resulting in no net effect on upwelling.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geography, Physical
Dawei Liu, Sebastien Bertrand, Elke Vandekerkhove, Virginie Renson
Summary: Floods are one of the most destructive natural hazards on Earth. Research in Patagonia has shown that fine-grained and organic-poor sediment layers in downstream fjord areas represent glacier lake outburst floods, while coarser and organic-rich deposits indicate meteorological floods. Sr-87/Sr-86 and epsilon Nd analysis can accurately reconstruct the provenance of flood deposits, with results confirming distinct signatures for different flood types. Additionally, the study highlights the impact of rain-on-snow events occurring in different seasons on the sedimentary signature of floods in partially glacierized watersheds.
EARTH SURFACE PROCESSES AND LANDFORMS
(2022)
Article
Cultural Studies
Joao-Manuel Neves
Summary: This article discusses the Wiriyamu massacre in 1972, exploring the different descriptions of the event by the Portuguese intelligentsia and the motivations behind them. The article also draws parallels with colonial literature from the 1920s, analyzing the connection between present-day denial rhetoric and racist or culturalist representations.
INTERVENTIONS-INTERNATIONAL JOURNAL OF POSTCOLONIAL STUDIES
(2023)
Article
Plant Sciences
Ke Zhang, Jiangbao Xia, Li Su, Fanglei Gao, Qian Cui, Xianshuang Xing, Mingming Dong, Chuanrong Li
Summary: In this study, six different microtopographic modification patterns were established on the beaches of the Yellow River Delta, and measurements and analysis were conducted on soil water, salt, nutrients, and plant growth. The results showed that microtopographic modification significantly affected soil properties and vegetation restoration, with the crescent-shaped pattern performing the best in terms of reducing soil salinity and promoting vegetation restoration.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Marine & Freshwater Biology
Mustafizur M. Rahman
Summary: This study addresses the lack of information on the environmental factors that affect the structure of epibenthic copepods in various lotic environments. The results show that phytoplankton density, salinity, total suspended solids, and dissolved oxygen significantly influence the abundance of epibenthic copepod groups.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)
Article
Ecology
Pengshuai Shao, Hongyan Han, Jingkuan Sun, Hongjun Yang, Hongtu Xie
Summary: This study found that high salinity in coastal wetlands restricts the accumulation of microbial residues and their contribution to the SOC pool, while low salinity wetlands have higher available soil resources, promoting microbial-derived C contribution to SOC.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2022)
Article
Environmental Sciences
Diep Cong-Thi, Linh Pham Dieu, Robin Thibaut, Marieke Paepen, Huu Hieu Ho, Frederic Nguyen, Thomas Hermans
Summary: This study presents a methodology for the semiquantitative interpretation of Electrical Resistivity Tomography (ERT) in coastal aquifers under pressure from growing populations and climate change. The method aims to provide insights into the extent of saltwater intrusion without colocated well data, and has been successfully applied in the Luy River aquifers in Vietnam.
Article
Geochemistry & Geophysics
Tengfei Fu, Chen Qi, Zhenyan Wang, Chenzhe Li, Wenquan Liu, Yushan Fu, Guangquan Chen, Qiao Su, Xingyong Xu, Hongjun Yu
Summary: This study investigates the impact of seawater intrusion and anthropogenic activity on coastal groundwater in Zhejiang and Fujian provinces in China. The results show that seawater intrusion is the main cause of increasing salinity in Zhejiang Province, while water-rock interactions play a role in Fujian Province. The study also reveals that nitrate and fluoride indicators are influenced by anthropogenic activity and seawater intrusion. The water quality index shows that coastal groundwater in Fujian Province is better than in Zhejiang Province.
Article
Environmental Sciences
Sarah E. Janssen, Joel C. Hoffman, Ryan F. Lepak, David P. Krabbenhoft, David Walters, Collin A. Eagles-Smith, Greg Peterson, Jacob M. Ogorek, John F. DeWild, Anne Cotter, Mark Pearson, Michael T. Tate, Roger B. Yeardley Jr, Marc A. Mills
Summary: This study found that legacy mercury contamination is widespread in sediments of the Saint Louis River estuary, reaching the food web and impacting fish species. Isotope analysis confirmed the presence of industrial mercury in the estuary, which influences the mercury values in prey fish and migratory game fish extending into Lake Superior. The findings suggest that understanding the sources and movement of mercury within estuarine food webs is crucial for restoration strategies in Great Lakes coastal zones.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Biotechnology & Applied Microbiology
Diana X. Sahonero-Canavesi, Laura Villanueva, Nicole J. Bale, Jade Bosviel, Michel Koenen, Ellen C. Hopmans, Jaap S. Sinninghe Damste
Summary: This study reveals that the biosynthesis of membrane-spanning lipids in Thermotogales bacteria is influenced by growth phase rather than temperature. The findings suggest that changes in core lipid levels play a crucial role in the biosynthesis of these lipids.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Geography, Physical
Iuliana Vasiliev, Marcel T. J. van der Meer, Marius Stoica, Wout Krijgsman, Gert-Jan Reichart, Sergei Lazarev, Geanina A. Butiseaca, Eva M. Niedermeyer, Elmira Aliyeva, Christian G. C. van Baak, Andreas Mulch
Summary: Landlocked basins like the Caspian Sea are highly sensitive to hydrological changes, especially when disconnected from the global ocean. Using compound-specific hydrogen isotope data, palaeohydrological and palaeoenvironmental changes in the region were reconstructed, showing a connection with the Arctic domain and the Black Sea during different geological stages.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geography, Physical
Jaap S. Sinninghe Damste, Yuki Weber, Jakob Zopfi, Moritz F. Lehmann, Helge Niemann
Summary: Isoprenoidal glycerol dialkyl glycerol tetraether (isoGDGT) lipids are mainly derived from archaea in the water column of Lake Lugano, Switzerland. The concentration of isoGDGTs, particularly Crenarchaeol, is higher in deeper waters below the thermocline. The distribution of isoGDGTs in surface sediments indicates downward transport from the water between the thermocline and the anoxic hypolimnion. The composition of isoGDGTs in surface sediments of other (peri-)alpine lakes varies based on lake size.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Meteorology & Atmospheric Sciences
P. Harding, C. Martin-Puertas, J. Sjolte, A. A. Walsh, R. Tjallingii, C. Langdon, S. P. E. Blockley, A. Brauer, P. Langdon, A. M. Milner, R. Muscheler, M. Perez
Summary: Understanding the atmospheric response to radiative forcing and wind patterns is crucial for future implications. This study examines varved records from Diss Mere, England, during a Grand Solar Minima (GSM) and discusses the solar-wind linkage in the North Atlantic-European region. The research finds evidence for increased windiness during the GSM, synchronous with changes in C-14 production and atmospheric response.
Article
Ecology
Ulrike Hanz, Philip Riekenberg, Anna de Kluijver, Marcel van der Meer, Jack J. Middelburg, Jasper M. de Goeij, Martijn C. Bart, Erik Wurz, Ana Colaco, Gerard C. A. Duineveld, Gert-Jan Reichart, Hans-Tore Rapp, Furu Mienis
Summary: This study reveals how deep-sea sponge grounds survive in a food-limited environment through stable isotope analysis. Sponge with high microbial abundance utilize dissolved resources and efficient recycling pathways to sustain themselves and other organisms. Additionally, sponges provide organic material to support the otherwise food-limited associated fauna, contributing to the thriving deep-sea ecosystems.
FUNCTIONAL ECOLOGY
(2022)
Article
Environmental Sciences
Reyhaneh Roohi, Ragna Hoogenboom, Ronald Van Bommel, Marcel T. J. van der Meer, Furu Mienis, Sabine Gollner
Summary: This study investigates the export and influence of carbon produced by hydrothermal vents on benthic food webs. It reveals that fauna near the venting area primarily rely on chemosynthetic organic carbon, while fauna further away from the vents rely more on photosynthetic organic carbon. Nematodes are the most abundant faunal taxon. These findings have important implications for future spatial management plans in deep-sea mining at hydrothermal vents.
FRONTIERS IN MARINE SCIENCE
(2022)
Review
Biochemistry & Molecular Biology
Anandi Tamby, Jaap Sinninghe S. Damste, Laura Villanueva
Summary: The deep-sea environment is characterized by extreme conditions, including high hydrostatic pressure and near-freezing temperature. Piezophiles, microorganisms adapted to high pressure, have developed specific membrane lipid strategies to withstand these conditions, such as increased abundance of lipids containing unsaturated and branched-chain fatty acids with increasing hydrostatic pressure. However, not all piezophiles employ this strategy, highlighting the need for further understanding of the effects of hydrostatic pressure on microbial lipid membranes.
FRONTIERS IN MOLECULAR BIOSCIENCES
(2023)
Article
Ecology
Suzanne S. H. Poiesz, Johannes I. J. Witte, Marcel T. J. van der Meer, Zwanette Jager, Karline E. R. Soetaert, Tjisse van der Heide, Henk W. van der Veer
Summary: Spatial variability in fish food-web structure in the Wadden Sea was studied by comparing stomach content and bulk stable isotopes of fish species caught in the Ems and Marsdiep basins. The findings showed that most fish species in both basins were generalist feeders, with a few key prey species driving the food web. The study also revealed spatial differences in prey preferences, which were likely influenced by local predator and prey abundances.
MARINE ECOLOGY PROGRESS SERIES
(2023)
Article
Geosciences, Multidisciplinary
Celia Martin-Puertas, Armand Hernandez, Eulogio Pardo-Iguzquiza, Laura Boyall, Chris Brierley, Zhiyi Jiang, Rik Tjallingii, Simon P. E. Blockley, Francisco Javier Rodriguez-Tovar
Summary: According to a lake-sediment record and model simulations, meltwater discharge in the mid-Holocene North Atlantic disrupted decadal climate variability, suggesting that future melting on Greenland may hinder climate predictability in the region.
Article
Environmental Sciences
A. A. Cluett, E. K. Thomas, N. P. McKay, O. C. Cowling, I. S. Castaneda, C. Morrill
Summary: Quantitative temperature reconstructions using lacustrine organic geochemical proxies provide important constraints on past continental climates. However, the estimation of air temperatures from proxies can be affected by non-stationarity in the relationships between seasonal air and water temperatures, especially in strongly seasonal high-latitude settings. This study combines downcore analyses of brGDGTs and alkenones with forward-modeled proxy values based on lake model simulations to evaluate temperature-driven changes. The results suggest that the distribution of brGDGTs reflects multi-decadal summer air temperature changes, while the drivers of alkenone variability remain unclear.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Devika Varma, Katrin Hättig, Marcel T. J. van der Meer, Gert-Jan Reichart, Stefan Schouten
Summary: The TEX86 paleothermometer is widely used for reconstructing past sea water temperatures, but the specific export depths represented by this proxy are still unclear. Through studying paleotemperature proxies from two pairs of closely located cores from Chilean and Angola margins, this study provides new insights into constraining the depths recorded by the TEX86 proxy. The study shows that the TEX86 records were statistically indistinguishable between the core sites, indicating the usefulness of this approach for paleo-reconstructions.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2023)
Article
Geochemistry & Geophysics
Hana Jurikova, Simon J. Ring, Michael J. Henehan, Ina Neugebauer, Birgit Schroeder, Daniela Mueller, Markus J. Schwab, Rik Tjallingii, Achim Brauer, Cecile Blanchet
Summary: The Dead Sea brines have a unique chemical composition and high boron isotope values, but little is known about their formation and driving processes. This study reconstructs past brine conditions using boron isotopes and related elements in lacustrine sediments, and finds that the brines of the late Holocene Dead Sea have higher boron isotope values compared to the glacial precursor Lake Lisan. Boron cycle modeling suggests that the enrichment of boron isotopes in post-glacial brines is due to a reduction in freshwater inflow, co-precipitation of boron in evaporitic deposits, and loss of boron in atmospheric water vapor.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Review
Parasitology
Ana Born-Torrijos, Philip Riekenberg, Marcel T. J. van der Meer, Milen Nachev, Bernd Sures, David W. Thieltges
Summary: Wild animals infected with parasites can alter their hosts' trophic niches and resource flows. It is important to consider the infection status when studying the trophic positions of wild organisms.
TRENDS IN PARASITOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Markus Czymzik, Rik Tjallingii, Birgit Plessen, Peter Feldens, Martin Theuerkauf, Matthias Moros, Markus J. Schwab, Carla K. M. Nantke, Silvia Pinkerneil, Achim Brauer, Helge W. Arz
Summary: Knowledge about Holocene environmental variability in the circum-Baltic region is crucial for understanding its responses to climate change. By analyzing sediments from Lake Kalksjon in Sweden, we found that the lake's productivity was higher during periods of warmer winters and a positive North Atlantic Oscillation (NAO) polarity. The NAO polarity may serve as a qualitative record of the lake's productivity over the past 9600 years.
CLIMATE OF THE PAST
(2023)
Article
Ecology
Zoe R. van Kemenade, Laura Villanueva, Ellen C. Hopmans, Peter Kraal, Harry J. Witte, Jaap S. Sinninghe Damste, Darci Rush
Summary: Interpreting lipid biomarkers in sediment archives requires a good understanding of their application and limitations. It has been discovered that marine bacteria performing anaerobic ammonium oxidation (anammox) synthesize a stereoisomer of bacteriohopanetetrol (BHT-x), which can serve as a proxy for water column anoxia. In the water column of the Benguela upwelling system, high BHT-x abundances were found in the oxygen-deficient zone, along with high abundances of Ca. Scalindua genes and ladderane intact polar lipids (IPLs). However, BHT-x ratios were low in oxygenated offshore waters. The BHT-x ratio of >= 0.2 is a robust threshold for oxygen-depleted waters.