Marcelo Ketzer
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View article: Chronological evidence of microplastic accumulation and contamination onset in Central Baltic Sea sediments
Chronological evidence of microplastic accumulation and contamination onset in Central Baltic Sea sediments Open
Microplastics (MPs) are a significant environmental concern due to their abundance, widespread occurrence, slow degradation rate, and toxicity. Although MPs have been found in various environments and organisms (including humans), few stud…
View article: Long-term warming raises risks of seasonal seafloor methane release in the coastal Baltic Sea
Long-term warming raises risks of seasonal seafloor methane release in the coastal Baltic Sea Open
Climate change driven ocean warming is a worldwide environmental issue that can impact cycling of greenhouse gases. However, how methane production in marine sediments as a potential contributor to atmospheric greenhouse gases versus its c…
View article: Climate warming disrupts zooplankton phenology and overwintering strategies
Climate warming disrupts zooplankton phenology and overwintering strategies Open
Zooplankton are crucial for food webs and biogeochemical cycles. However, warming associated with climate change may alter their seasonal timing and reproductive strategies. This study investigated how long‐term warming impacted zooplankto…
View article: Baseline assessment of metal and microplastic pollution in sediments of a small-sized harbor in western Baltic Sea (Kalmar, Sweden)
Baseline assessment of metal and microplastic pollution in sediments of a small-sized harbor in western Baltic Sea (Kalmar, Sweden) Open
This study provides a baseline analysis of sediment pollution in Kalmar Guest Harbor, Sweden, focusing on metals and microplastics. The study site, a bustling coastal area, was chosen to investigate the connections between anthropogenic ac…
View article: Long-term and future methane geochemistry in the Baltic Sea: A transport-reaction model approach
Long-term and future methane geochemistry in the Baltic Sea: A transport-reaction model approach Open
The Baltic Sea, a brackish basin characterised by significant organic matter deposition, presents a crucial area for climate change research. This study examines the long-term evolution of methane geochemistry in sediments from four sites …
View article: Microbial methanogenesis fueled by freshwater infiltration and oil biodegradation in the Siljan impact structure, Sweden
Microbial methanogenesis fueled by freshwater infiltration and oil biodegradation in the Siljan impact structure, Sweden Open
Deeply fractured rocks of meteorite impact craters are suggested as prime niches for subsurface microbial colonization. Methane can be a product of such microbial communities and seeps of methane from impact craters on Earth are of strong …
View article: Editorial: From cold seeps to hydrothermal vents: geology, chemistry, microbiology, and ecology in marine and coastal environments
Editorial: From cold seeps to hydrothermal vents: geology, chemistry, microbiology, and ecology in marine and coastal environments Open
International audience
View article: Animated Cartoon und implizite Religion
Animated Cartoon und implizite Religion Open
View article: Climate change induces shifts in coastal Baltic Sea surface water microorganism stress and photosynthesis gene expression
Climate change induces shifts in coastal Baltic Sea surface water microorganism stress and photosynthesis gene expression Open
The world’s oceans are challenged by climate change linked warming with typically highly populated coastal areas being particularly susceptible to these effects. Many studies of climate change on the marine environment use large, short-ter…
View article: Baltic Sea coastal sediment-bound eukaryotes have increased year-round activities under predicted climate change related warming
Baltic Sea coastal sediment-bound eukaryotes have increased year-round activities under predicted climate change related warming Open
Climate change related warming is a serious environmental problem attributed to anthropogenic activities, causing ocean water temperatures to rise in the coastal marine ecosystem since the last century. This particularly affects benthic mi…
View article: Discovery of a major seafloor methane release site in Europe: The Landsort deep, Baltic Sea.
Discovery of a major seafloor methane release site in Europe: The Landsort deep, Baltic Sea. Open
A recently acquired multidisciplinary dataset comprising acoustic surveys (high-resolution sub-bottom profiles, multi-beam bathymetry, and broad band mid-water echo sounder), geochemistry (gas chemical and isotopic composition, porewater c…
View article: Understanding the methane cycle in heavily populated semi-closed Bays: a case study of Tokyo Bay and the Baltic Sea
Understanding the methane cycle in heavily populated semi-closed Bays: a case study of Tokyo Bay and the Baltic Sea Open
Methane is an important greenhouse gas, and global methane emission has been estimated separately from the perspective of anthropogenic and natural factors. However, in heavily populated semi-closed bays, methane emissions may be governed …
View article: Near seafloor methane flux in the world's largest human-induced dead zone is regulated by sediment accumulation rate
Near seafloor methane flux in the world's largest human-induced dead zone is regulated by sediment accumulation rate Open
The vast oxygen-depleted area of the central Baltic Sea is the largest human-induced dead zone in the world with 70,000 km2 or approximately three times the second largest one in the Gulf of Mexico. Methane occurs in high concentrations in…
View article: Hidratos de Gás Na Margem Continental Brasileira
Hidratos de Gás Na Margem Continental Brasileira Open
O presente capítulo faz uma introdução geral sobre o tema hidratos de gás naturais, i.e., que ocorrem nos sedimentos, apresentando os tipos existentes, como se formam, os principais gases envolvidos, a sua importância econômica e ambiental…
View article: Gas hydrate studies in Brazil: future perspectives
Gas hydrate studies in Brazil: future perspectives Open
International audience
View article: Long-term warming modulates diversity, vertical structuring of microbial communities, and sulfate reduction in coastal Baltic Sea sediments
Long-term warming modulates diversity, vertical structuring of microbial communities, and sulfate reduction in coastal Baltic Sea sediments Open
Coastal waters such as those found in the Baltic Sea already suffer from anthropogenic related problems including increased algal blooming and hypoxia while ongoing and future climate change will likely worsen these effects. Microbial comm…
View article: Climate change-related warming reduces thermal sensitivity and modifies metabolic activity of coastal benthic bacterial communities
Climate change-related warming reduces thermal sensitivity and modifies metabolic activity of coastal benthic bacterial communities Open
Besides long-term average temperature increases, climate change is projected to result in a higher frequency of marine heatwaves. Coastal zones are some of the most productive and vulnerable ecosystems, with many stretches already under an…
View article: Gravity complexes as a focus of seafloor fluid seepage: the Rio Grande Cone, SE Brazil
Gravity complexes as a focus of seafloor fluid seepage: the Rio Grande Cone, SE Brazil Open
View article: Halogens dissolved in interstitial water reveal the origin of migrating fluids in sediments of the Alboran Sea (western Mediterranean)
Halogens dissolved in interstitial water reveal the origin of migrating fluids in sediments of the Alboran Sea (western Mediterranean) Open
Fluid migration in sedimentary basins has profound effects on a range of geological processes, including the methane cycle, tectonic and sedimentary geohazards, and microbial communities in the oceans. The Alboran Sea is a tectonically act…
View article: Metagenomic and isotope geochemical characterization of deep subsurface microbial methanogenesis at the Siljan impact structure, Sweden
Metagenomic and isotope geochemical characterization of deep subsurface microbial methanogenesis at the Siljan impact structure, Sweden Open
View article: Seismic evidence of gas hydrate and seafloor fluid escape on the upper Amazon deep-sea fan, Brazilian equatorial margin
Seismic evidence of gas hydrate and seafloor fluid escape on the upper Amazon deep-sea fan, Brazilian equatorial margin Open
The Amazon fan contains a gas hydrate province known from a bottom-simulating reflection (BSR) that lies within an upper slope compressional belt. In this study, the extent and character of the BSR and its relation to thrust-fold structure…
View article: Anaerobic oxidation has a minor effect on mitigating seafloor methane emissions from gas hydrate dissociation
Anaerobic oxidation has a minor effect on mitigating seafloor methane emissions from gas hydrate dissociation Open
Continental margin sediments contain large reservoirs of methane stored as gas hydrate. Ocean warming will partly destabilize these reservoirs which may lead to the release of substantial, yet unconstrained, amounts of methane. Anaerobic o…
View article: The response of metal mobilization and redistribution to reoxygenation in Baltic Sea anoxic sediments
The response of metal mobilization and redistribution to reoxygenation in Baltic Sea anoxic sediments Open
View article: The effects of re-oxygenation of central Baltic Sea sediment; a laboratory study
The effects of re-oxygenation of central Baltic Sea sediment; a laboratory study Open
<p>The eutrophication of the deep central Baltic Sea, Baltic Proper, has caused deoxygenation severe consequences for benthic life. To overcome such limitations and spreads of anoxic basins, proposed techniques such as re-oxygenation…
View article: Cenozoic tectonic plate interaction registered in a South Atlantic passive margin basin (southern sector, Pelotas Basin)
Cenozoic tectonic plate interaction registered in a South Atlantic passive margin basin (southern sector, Pelotas Basin) Open
<p>The South Atlantic present-day configuration is the result of remarkable paleogeographic and paleoclimate events that occurred during the Cenozoic. These tectono-climatic events include opening and closing ocean gateways, hyperthe…
View article: The ALBACORE oceanographic cruise: tectonic and sedimentary processes at distinct temporal and spatial scales in the Alboran Sea
The ALBACORE oceanographic cruise: tectonic and sedimentary processes at distinct temporal and spatial scales in the Alboran Sea Open
<p>The Alboran Sea (Western Mediterranean) is a relatively small ocean basin connected with the Atlantic that provides a rich archive of tectonic and sedimentary processes at distinct temporal and spatial scales during the Quaternary…
View article: Genomic, biochemical, and phylogenetic evaluation of bacteria isolated from deep-sea sediment harboring methane hydrates
Genomic, biochemical, and phylogenetic evaluation of bacteria isolated from deep-sea sediment harboring methane hydrates Open
View article: Weakened resilience of benthic microbial communities in the face of climate change
Weakened resilience of benthic microbial communities in the face of climate change Open
Increased ocean temperature associated with climate change is especially intensified in coastal areas and its influence on microbial communities and biogeochemical cycling is poorly understood. In this study, we sampled a Baltic Sea bay th…
View article: Removal and potential recovery of dissolved metals from acid sulfate soil drainage by spent coffee-grounds and dissolved organic carbon
Removal and potential recovery of dissolved metals from acid sulfate soil drainage by spent coffee-grounds and dissolved organic carbon Open
View article: Connectivity of Fennoscandian Shield terrestrial deep biosphere microbiomes with surface communities
Connectivity of Fennoscandian Shield terrestrial deep biosphere microbiomes with surface communities Open