A5016019335- Geology and Paleoclimatology Research
- Marine Biology and Ecology Research
- Isotope Analysis in Ecology
- Marine and coastal ecosystems
- Ocean Acidification Effects and Responses
- Marine and environmental studies
- Paleontology and Stratigraphy of Fossils
- Methane Hydrates and Related Phenomena
- Marine Bivalve and Aquaculture Studies
- Radioactive contamination and transfer
- Radioactive element chemistry and processing
- Environmental Toxicology and Ecotoxicology
- Cephalopods and Marine Biology
- Arctic and Antarctic ice dynamics
- Ion-surface interactions and analysis
- Pleistocene-Era Hominins and Archaeology
- Microbial Community Ecology and Physiology
- Cryospheric studies and observations
- Coral and Marine Ecosystems Studies
- Algal biology and biofuel production
- Water Quality Monitoring and Analysis
- Wastewater Treatment and Nitrogen Removal
- Physiological and biochemical adaptations
- Geological and Geochemical Analysis
- Microplastics and Plastic Pollution
Kiel University
2016-2025
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2010-2017
GEOMAR Helmholtz Centre for Ocean Research Kiel
2016
Columbia University
2013
Lamont-Doherty Earth Observatory
2013
Texas A&M University
2010
Abstract. The Mg/Ca ratio of Foraminifera calcium carbonate tests is used as proxy for seawater temperature and widely applied to reconstruct global paleo-climatic changes. However, the mechanisms involved in biomineralization process are poorly understood. current paradigm holds that ions test supplied primarily by endocytosis seawater. Here, we combine confocal-laser scanning-microscopy observations a membrane-impermeable fluorescent marker extant benthic species Ammonia aomoriensis with...
The impact of anthropogenic ocean acidification (OA) on marine ecosystems is a vital concern facing scientists and managers resources. Euthecosomatous pteropods (holoplanktonic gastropods) represent an excellent sentinel for indicating exposure to OA because the sensitivity their aragonite shells conditions less favorable calcification. However, integration observations, experiments modelling efforts needed make accurate predictions how these organisms will respond future changes...
Biosorption is nowadays recommended as an ecological and environmentally friendly alternative to remove metals from contaminated regions. Even in situ incubations of algae on the seabed are conducted investigate potential future ways reducing metal contamination. Our study investigated negative effects microorganisms when metal-enriched released into marine environment. We cultured microalgae Nannochloropsis oceanica strain CCMP1779 with
Abstract. About 30% of the anthropogenically released CO2 is taken up by oceans; such uptake causes surface ocean pH to decrease and commonly referred as acidification (OA). Foraminifera are one most abundant groups marine calcifiers, estimated precipitate ca. 50 % biogenic calcium carbonate in open oceans. We have compiled state art literature on OA effects foraminifera, because majority research this group was published within last three years. Disparate responses important calcifiers were...
The chemical and isotopic composition of foraminiferal shells (so‐called proxies) reflects the physicochemical properties seawater. In current day paleoclimate research, reconstruction past seawater carbonate system to infer atmospheric CO 2 concentrations is one most pressing challenges, a variety proxies have been investigated, such as U/Ca. Since in natural traditional perturbation experiments parameters covary, it not possible determine parameter causing, e.g., changes U/Ca, complicating...
Concerns about pollutants in the environment are increasing, with substances such as plastic additives drawing particular concern due to their potential harmful effects on organisms. This study investigates current levels of several contaminants Kiel Fjord. Some pose serious health risks aquatic life. In September 2022, water and sediment samples were collected from fifteen stations across inner outer The concentrations selected phthalates, tire-derived compounds, heavy metals measured....
Circumpolar Deep Water (CDW) poses a major threat for the future stability of Antarctic Ice Sheet. In Southern Ocean, CDW encroaches onto continental shelf in East Antarctica. is warmest deep-water mass within and thus, harbours large amounts heat with potential to drive basal melting under ice cavities it reaches. The PS141 expedition focused on Denman Glacier, one fastest retreating glaciers Aurora subglacial basin. It holds sea level rise equivalent up 1.6 m. However, processes behind...
Pteropods are among the first responders to ocean acidification and warming, but have not yet been widely explored as carriers of marine paleoenvironmental signals. In order characterize stable isotopic composition aragonitic pteropod shells their variation in response climate change parameters, such seawater temperature, (Heliconoides inflatus) were collected along a latitudinal transect Atlantic Ocean (31° N 38° S). Comparison shell oxygen depth changes calculated aragonite equilibrium...
Abstract. The Mg / Ca ratio of foraminifera calcium-carbonate tests is used as proxy for seawater temperature and widely applied to reconstruct global paleo-climatic changes. However, the mechanisms involved in carbonate biomineralization process are poorly understood. current paradigm holds that calcium ions test supplied primarily by endocytosis seawater. Here, we combine confocal-laser scanning-microscopy observations a membrane-impermeable fluorescent marker extant benthic species...
Abstract. Foraminifera are unicellular organisms that play an important role in marine organic matter cycles. Some species able to isolate chloroplasts from their algal food source and incorporate them as kleptoplasts into own metabolic pathways, a phenomenon known kleptoplastidy. One showing this ability is Elphidium excavatum, common foraminifer the Kiel Fjord, Germany. The Fjord fed by several rivers thus forms habitat with strongly fluctuating salinity. Here, we tested effects of source,...
Abstract There is growing interest in the use of pteropods as potential archives past changes ocean chemistry. However, have rarely been used studies millennial-scale sedimentary records, especially shallow-marine environments. This study obtained core data for last 16 kyr from Northwest Shelf Australia (NWS). Changes carbonate saturation state were assessed based on carbon isotope ratios (δ 13 C) shells and Limacina dissolution index (LDX) measured planktonic pteropod species Heliconoides...
Marine carbon and nitrogen processing through microorganisms’ metabolism is an important aspect of the global element cycles. For that purpose, we used foraminifera to analyze turnover with different algae food sources. In Baltic Sea, benthic are quite common therefore it understand their metabolism. Especially, Cribroelphidium selseyense , also occurring in has often been for laboratory feeding experiments test effect on or turnover. Therefore, were collected from Kiel Fjord fed six algal...
Abstract. Foraminifera are unicellular organisms that play an important role in marine organic matter cycles. Some species able to isolate chloroplasts from their algal food source and incorporate them as kleptoplasts into own metabolic pathways, a phenomenon known kleptoplastidy. One showing this ability is Elphidium excavatum, common foraminifer the Kiel fjord, Germany. The fjord fed by several rivers thus forms habitat with strongly fluctuating salinity. Here, we tested effects of source,...