Article
Multidisciplinary Sciences
Cristian Aldea, Leslie Novoa, Maria Paz Acuna, Ignacia Acevedo-Romo, Francisco Bravo
Summary: The CIMAR program, conducted by the Chilean Navy through the National Oceanographic Committee, has been collecting samples and data on biotic and abiotic variables in Chilean fjord and channel zones (CIMAR-Fjords) and Chilean remote islands (CIMAR-Islands) since 1995. This study standardized and summarized the published information on benthic organisms from 21 CIMAR-Fjords cruises and the Southern Ice Fields Cruise 1995, providing valuable data on the distribution, abundance, and geographic location of sampling stations. The data set consists of 8,854 records from 880 different localities, representing 1,225 species from 24 different phyla and over 150,000 individuals, and can serve as a baseline for ecological studies and ecosystem conservation in Chilean Patagonia.
Article
Geography, Physical
Annette Hahn, Frank H. Neumann, Charlotte Miller, Jemma Finch, Tarryn Frankland, Hayley C. Cawthra, Enno Schefuss, Matthias Zabel
Summary: Mpondoland on the South African east coast is influenced by temperate and tropical circulation and climate systems, with sediment records indicating regional climatic change and anthropogenic influence over the past 5500 years. The study uses various data sources to infer paleoclimatic shifts and reconstruct past human activity, providing evidence of human impacts and increased erosion as early as -1500 years ago. Downcore proxy analysis suggests that particularly humid conditions persisted from -900 to -300 cal yr BP, encompassing both the Medieval Climate Anomaly and the Little Ice Age.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Microbiology
Maria Papale, Carmen Rizzo, Stefania Giannarelli, Gabriella Caruso, Stefano Amalfitano, Paul Eric Aspholm, Giovanna Maimone, Stefano Miserocchi, Alessandro Ciro Rappazzo, Angelina Lo Giudice, Maurizio Azzaro
Summary: This study aims to study the riverine benthic microbial community in the Paasvik River and evaluate its ecological role in relation to contamination levels. The results show that bacterial diversity in the river sediments is influenced by micro-niche conditions, with differences in the abundance of taxa involved in the C, Fe, and N cycles, as well as organic pollutant and toxic compound degradation.
Article
Geosciences, Multidisciplinary
Pawan Govil, Abhijit Mazumder, Shailesh Agrawal, Syed Azharuddin, Ravi Mishra, Hidayatullah Khan, Brijesh Kumar, Divya Verma
Summary: The study reveals changes in the southwest monsoon intensity and humidity levels in the western Bay of Bengal over the past 6,000 years, associated with the Roman and Medieval Warm Periods. The correlation between planktonic foraminifera relative abundance and sand percentage suggests a decline in productivity possibly due to terrigenous dilution.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Arbia Jouini, Guillaume Paris, Guillaume Caro, Annachiara Bartolini, Sivia Gardin
Summary: The Mesozoic-Cenozoic transition is a period of significant disruptions in the biogeochemical cycle, with the Cretaceous-Paleogene boundary (K-Pg) crisis being the most notable one. This crisis resulted in the extinction of marine calcifiers due to the increase in atmospheric CO2 concentration and ocean acidification triggered by the Chicxulub Impact and Deccan volcanism. The Ca isotope composition of carbonate minerals can provide insights into these environmental changes. The study presents new records of planktonic and benthic foraminiferal & delta;44/40Ca, & delta;18O, & delta;13C, and Sr/Ca across the K-Pg transition, indicating rapid shifts in & delta;44/40Ca that are likely caused by changes in precipitation rates rather than global disequilibrium in the oceans' Ca budget.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Environmental Sciences
Maria Virginia Alves Martins, Lucas Cazelli, Missilene Yhasnara, Layla da CristineSilva, Murilo Barros Saibro, Fabia Emanuela Rafaloski Bobco, Belen Rubio, Bruna Ferreira, Wellen Fernanda Louzada Castelo, Jose Francisco Santos, Sara Ribeiro, Fabrizio Frontalini, Michael Martinez-Colon, Egberto Pereira, Luzia Antonioli, Mauro Geraldes, Fernando Rocha, Silvia Helena Mello e Sousa, Joao Manuel Alveirinho Dias
Summary: This study analyzes the potential metal contamination in the distal zone of Ria de Vigo in North Spain. The analysis of a sediment core reveals enrichment of several elements, such as Cu, Ag, Mo, As, Sb, S, Zn, Ni, Sn, Cd, Cr, Co, Pb, and Li, which may be attributed to mining activities in the region. Different pollution phases were identified, ranging from the Late Bronze Age to the industrial and modern period. The protection of the islands, river erosion, oceanographic and climatic changes, atmospheric contamination, and diagenetic sedimentary processes contribute to the accumulation and preservation of this metal contamination record in the distal region of Ria de Vigo.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Geography, Physical
N. M. Gayathri, A. V. Sijinkumar, B. Nagender Nath, K. Sandeep, K. Y. Wei
Summary: This study investigates the changes in stratification and productivity in the southern Andaman Sea induced by variations in the Indian summer monsoon (ISM) over the past 30,000 years. The research utilizes foraminifera assemblages and sediment geochemistry, along with statistical, spectral, and wavelet analyses. The findings reveal significant periodicities in the ISM, with solar irradiance variability playing a major role. The study also identifies three distinct changes in the salinity structure of the Andaman Sea over time and space.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Engineering, Civil
Sofia E. Kjellman, Elizabeth K. Thomas, Anders Schomacker
Summary: High-latitude lakes are sensitive to climate change and can store information about large-scale circulation changes and catchment-integrated processes. The isotopic composition of lakes is influenced by inflow seasonality and evaporation, with each lake varying in sensitivity to these controls over time.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
Laura Tavera Martinez, Margarita Marchant, Praxedes Munoz, Roberto T. Abdala Diaz
Summary: This study reconstructed the ecological and environmental features of Mejillones Bay by studying benthic foraminifera, and the results showed significant differences between Mejillones Bay and other OMZs.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Environmental
Pearse James Buchanan, Alessandro Tagliabue, Camille de la Vega, Claire Mahaffey
Summary: Stable isotopes of nitrogen (δ N-15) are used to study food web dynamics, but the isotopic gradient between the Pacific and Atlantic sectors of the Arctic Ocean is increasing. This increase is due to the growth in δ N-15 in the Pacific-influenced high Arctic and the decrease in the Atlantic sector. The trends may complicate food web studies but could aid movement studies as the Arctic isoscape becomes more regionally distinct.
Article
Environmental Sciences
Isabel R. Hilgendag, Heidi K. Swanson, Christopher W. Lewis, Ashley D. Ehrman, Michael Power
Summary: This study investigated mercury biomagnification in benthic, pelagic, and benthopelagic marine food webs in the Arctic, with results showing the highest biomagnification values in the benthopelagic food web. The benthic food web exhibited the greatest trophic diversity and isotopic niche area. Further study is needed to understand the impact of food web complexity on mercury biomagnification.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Biodiversity Conservation
Sulia Goeting, Huan Chiao Lee, Laszlo Kocsis, Claudia Baumgartner-Mora, David J. Marshall
Summary: This study investigated the diversity and distribution of benthic foraminifera on the Brunei shelf. A total of 99 species were found, including 52 new records for Brunei and the ecoregion. The study revealed the presence of at least three marine biotopes on the Brunei shelf and demonstrated the influence of depth and environmental conditions on species diversity and distribution.
Article
Geography, Physical
Sandrine Le Houedec, Meryem Mojtahid, Maria Ciobanu, Stephan J. Jorry, Fatima Zohra Bouhdayad, Emma Guyonneau, Stephane Sourice, Samuel Toucanne
Summary: The sedimentary archives of the Mediterranean Sea show deposits of organic-rich sediments at different time periods, with differences in timing between the western and eastern basins. Results indicate increased river activity in the western Mediterranean during the 11-6 kyr period, alongside cooler climate conditions.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Plant Sciences
Cecile C. Remy, Gwenael Magne, Normunds Stivrins, Tuomas Aakala, Hugo Asselin, Heikki Seppae, Tomi Luoto, Nauris Jasiunas, Adam A. A. Ali
Summary: Climate change is expected to increase wildfire activity in boreal ecosystems, threatening the carbon stocks of these forests. Understanding fire regimes and their relationship with climate and vegetation is crucial for anticipating the impact of climate change. However, the lack of long-term knowledge hinders this understanding in Fennoscandia.
JOURNAL OF ECOLOGY
(2023)
Article
Geography, Physical
Tathagata Roy Choudhury, Sonal Khanolkar, Santanu Banerjee
Summary: Glauconite formation is influenced by warm climate, with the highest abundance occurring during the Paleogene warm climatic intervals. Glauconite exists as pellets and infillings within the pores of bioclasts, with varying chemical compositions. The formation of glauconite is influenced by factors such as rapid transgression, reduced sedimentation rate, enhanced continental weathering, and enriched nutrient supply, which promote organic growth and facilitate the fixation of iron into the glauconite structure. However, rapid and extreme hyperthermal events inhibit glauconite formation.
GLOBAL AND PLANETARY CHANGE
(2022)
Article
Biodiversity Conservation
Neele Meyer, Max Wisshak, Andre Freiwald
Summary: This study examined bioerosion traces in the barnacle Bathylasma corolliforme from the Ross Sea in Antarctica using scanning electron microscopy. Sixteen different bioerosion traces were found in samples from various water depths, classified into microborings and macroborings. Comparison with a study from the Arctic Ocean showed similar ichnodiversity in polar waters, with some indicative ichnofossils occurring in both regions and showing a broad bathymetrical range.
Article
Biology
Max Wisshak, Neele Meyer, Piotr Kuklinski, Andres Ruggeberg, Andre Freiwald
Summary: The study found that calcifier diversity and bioerosion activity are higher in the rhodolith bed compared to adjacent aphotic waters, but these differences are not statistically significant. Despite some differences in depth and substrate structure, sediment coverage, carbonate formation rate, and bioerosion rate are significantly higher in the rhodolith bed.
Article
Ecology
Giovanni Sanna, Andre Freiwald
Summary: The study reveals that colony morphology of cold-water coral reefs is highly diverse, with geographic variations driven by local hydrodynamic conditions and associated food supply.
Article
Geochemistry & Geophysics
Tamas Muller, Adam Tomasovych, Matthias Lopez Correa, Regina Mertz-Kraus, Tomas Mikus
Summary: Determining secular changes in seawater temperature and Mg/Ca ratio is important in various paleo studies. In brachiopod shells, Mg/Ca is used to reconstruct historical temperature changes, but studies show a weak relationship between Mg/Ca and δ18 O and a positive correlation between Mg/Ca and Sr/Ca. The relation between growth lines and Mg/Ca fluctuation is not properly understood. This study analyzes intra-shell variation in Mg/Ca, S/Ca, and Sr/Ca in brachiopod shells and finds that Mg/Ca enrichment is closely associated with growth reduction and not simply seawater temperature changes.
Article
Marine & Freshwater Biology
Jacek Raddatz, Volker Liebetrau, Andres Rueggeberg, Anneleen Foubert, Sascha Floegel, Dirk Nuernberg, Karen Hissmann, Johannes Musiol, Tyler Jay Goepfert, Anton Eisenhauer, Wolf-Christian Dullo
Summary: Similar to tropical corals, cold-water corals (CWCs) can build large three-dimensional reef structures. Climate change poses a risk to these unique ecosystems. A recent study found detailed hydrographical changes in a CWC mound off southern Norway. The growth and formation of CWCs in this region are influenced by the interplay between the inflow of Atlantic water and the outflow of Baltic Sea water, with the presence of Baltic Sea water possibly endangering modern shallow Norwegian CWC reefs.
Article
Plant Sciences
Leon Hoffman, Andre Freiwald
Summary: This article reviews the species of the genus Talassia in the upper bathyal depth range of the Atlantic Ocean, proposing four new species and comparing them with other related species. The study shows regional differences in the shape and sculpture of the protoconch among the Talassia species.
EUROPEAN JOURNAL OF TAXONOMY
(2022)
Article
Geography, Physical
Patrycja G. Dworczak, Matthias Lopez Correa, Michal Jakubowicz, Axel Munnecke, Michael M. Joachimski, Claudio Mazzoli, Blazej Berkowski
Summary: This study provides new insights into the skeletogenesis and isotope fractionation effects in Palaeozoic heterocorals. The results suggest that the isotope fractionation mechanisms of heterocorals differed from modern scleractinian corals and resembled those of other marine calcifiers, such as extinct rugose corals and modern octocorals.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Zoology
Michael L. Zettler, Ed A. Hendrycks, Andre Freiwald
Summary: A new species of pontogeneiid amphipod, Dautzenbergia concavipalma sp. nov., was discovered from cold-water corals off Angola. This study provides a detailed description and comparison with known species of the genus, as well as a key to Dautzenbergia species.
Article
Geochemistry & Geophysics
Matthias Cazorla Correa, Sebastian Teichert, Federica Ragazzola, Salvador Cazorla Vazquez, Felix B. Engel, Katrin Hurle, Claudio Mazzoli, Piotr Kuklinski, Giancarlo Raiteri, Chiara Lombardi
Summary: This study investigates the characteristics of CCA (Crustose Coralline Algae) in Terra Nova, Ross Sea, Antarctica. The red alga Tethysphytum antarticum is examined for its skeletal architecture, mineralogical and geochemical composition, and taxonomic classification. Molecular genetics analysis confirms that T. antarcticum is a perfect match. The study also provides new diagnostic details for the reproductive organs of the alga and reveals a high-Mg calcite composition in the skeletal parts.
Article
Marine & Freshwater Biology
Giovanni Sanna, Janina V. V. Buescher, Andre Freiwald
Summary: This study compares the structural differences between cold-water corals and offshore corals using 3D scanning technology and finds that cold-water corals have higher volume compactness and surface complexity. The study also reveals that the structure of cold-water corals is influenced by current speed, while surface complexity is not significantly affected by current speed.
Article
Geochemistry & Geophysics
Chiara Lombardi, Piotr Kuklinski, Edoardo Spirandelli, Giorgio Bruzzone, Giancarlo Raiteri, Andrea Bordone, Claudio Mazzoli, Matthias Lopez Correa, Robert van Geldern, Laurent Plasseraud, Jerome Thomas, Frederic Marin
Summary: Some Antarctic bryozoans can create calcitic bioconstructions that promote habitat complexity, but the processes leading to biomineral formation are largely unknown. This study investigated three Antarctic bryozoans, analyzing their morphological and skeletal features, as well as the organic matrix associated with the skeleton. The results showed variations in growth check lines, zooid length, and basal zooidal walls among the species. Preliminary characterizations of the organic matrix revealed the presence of proteins, polysaccharides, and chitin-related saccharides, providing valuable insights into biomineral formation in bryozoans.
Article
Biodiversity Conservation
Jose Antonio Caballero Herrera, Leon Hoffman, Andre Freiwald, Serge Gofas
Summary: This study examines the molluscan fauna of the South Azorean Seamount Chain (SASC) and finds a high level of endemism within the area, with 22.5% of species being unique to the SASC. The study also reveals different larval development types among the species, including planktotrophic larvae and direct developers. The findings suggest a strong relationship between the SASC and the temperate Eastern Atlantic.
MARINE BIODIVERSITY
(2023)
Article
Geology
Patrycja G. Dworczak, Emilia Jarochowska, Matthias Lopez Correa, Blazej Berkowski
Summary: The study presents a detailed investigation of barnacle borings in heterocoral remains from the Devonian period in Morocco. Using micro-CT scans, the authors visualize the 3D morphology, orientation, and distribution of the borings, and conduct ordination and cluster analyses. The findings suggest that these borings do not fit any known ichnotaxa and leave room for further research and discussion in the field.
ANNALES SOCIETATIS GEOLOGORUM POLONIAE
(2022)
Article
Geosciences, Multidisciplinary
Robin Fentimen, Eline Feenstra, Andres Ruggeberg, Efraim Hall, Valentin Rime, Torsten Vennemann, Irka Hajdas, Antonietta Rosso, David Van Rooij, Thierry Adatte, Hendrik Vogel, Norbert Frank, Anneleen Foubert
Summary: This study provides a detailed reconstruction of cold-water coral mound build-up within the East Melilla Coral Province (southeastern Alboran Sea) over the last 300 kyr. The investigation reveals that mound build-up occurred during both interglacial and glacial periods, with average aggradation rates ranging between 1 and 10 cm kyr(-1). Coral growth during this time period was influenced by stressful environmental conditions.
CLIMATE OF THE PAST
(2022)