A5090001260- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Coastal wetland ecosystem dynamics
- Geological formations and processes
- Marine and coastal ecosystems
- Coastal and Marine Dynamics
- Cryospheric studies and observations
- Isotope Analysis in Ecology
- Microplastics and Plastic Pollution
- Marine Biology and Ecology Research
- Hydrocarbon exploration and reservoir analysis
- Marine and environmental studies
- Geological Studies and Exploration
- Climate change and permafrost
- Aquatic Ecosystems and Phytoplankton Dynamics
- Microbial Community Ecology and Physiology
- Winter Sports Injuries and Performance
- Heavy metals in environment
- Recycling and Waste Management Techniques
- Arctic and Antarctic ice dynamics
- Marine and coastal plant biology
- Soil and Water Nutrient Dynamics
- Polar Research and Ecology
- Toxic Organic Pollutants Impact
- Peatlands and Wetlands Ecology
University of Copenhagen
2015-2024
Geocenter Denmark
2010-2024
Danish Geodata Agency
2017-2024
Copenhagen Business School
2020
This paper presents research on the genetic structure and diversity of populations a common marine protist their changes over time. The bloom-forming diatom Skeletonema marinoi was used as model organism. Strains were revived from anoxic discrete layers 210 Pb-dated sediment core accumulated more than 100 y, corresponding to >40,000 mitotic generations. sampled highly eutrophic Mariager Fjord in Denmark. S. examined using microsatellite markers, enabling exploration through time effect...
Bacterial cells are mostly studied during planktonic growth although in their natural habitats they often found communities such as biofilms with dramatically different physiological properties. We have examined another type of community namely cellular aggregates observed strains the human pathogen Staphylococcus aureus. By laser-diffraction particle–size analysis (LDA) we show, for forming visible aggregates, that aggregation starts already early exponential phase and proceeds until...
Photosynthesis evolved in the oceans more than 3 billion years ago and has persisted throughout all major extinction events Earth's history. The most recent of such is linked to an abrupt collapse primary production due darkness following Chicxulub asteroid impact 65.5 million ago. Coastal phytoplankton groups (particularly dinoflagellates diatoms) appear have been resilient this biotic crisis, but reason for their high survival rates still unknown. Here we show that growth performance...
Abstract High Arctic ecosystems and Indigenous livelihoods are tightly linked exposed to climate change, yet assessing their sensitivity requires a long-term perspective. Here, we assess the vulnerability of North Water polynya, unique seaice ecosystem that sustains world’s northernmost Inuit communities several keystone species. We reconstruct mid-to-late Holocene changes in sea ice, marine primary production, little auk colony dynamics through multi-proxy analysis lake sediment cores. Our...
Rivers and estuaries are regarded as major pathways of microplastic (MP) transport from terrestrial areas to marine ecosystems. Despite this knowledge on the dynamics fate MP in freshwater riverine brackish estuarine waters is limited. Via ex situ settling experiments emulating Msimbazi River Estuary Dar es-Salaam, Tanzania, we demonstrate that flocculation subsequent positively buoyant fine-grained suspended sediment important for environmental plastic particles. Our results show velocities...
AbstractLundholm N., Ribeiro S., Andersen T.J., Koch T., Godhe A., Ekelund F. and Ellegaard M. 2011. Buried alive – germination of up to a century-old marine protist resting stages. Phycologia 50: 629–640. DOI: 10.2216/11-16.1We report on the survival stages naturally preserved in sediments from Koljö Fjord west coast Sweden. This work has focused dinoflagellate cysts, but diatom were also observed. We record longest known dormant cells. individually isolated more than 1200 cysts three most...
The factors controlling the relative abundances of Archaea and Bacteria in marine sediments are poorly understood. We determined depth distributions archaeal bacterial 16S rRNA genes by quantitative PCR at eight stations Aarhus Bay, Denmark. Bacterial outnumber 10-60-fold uppermost that irrigated mixed macrofauna. This bioturbation is indicated visual observations sediment color faunal tracks, porewater profiles dissolved inorganic carbon sulfate, unsupported 210Pb 137Cs. Below bioturbation,...
Abstract Baffin Bay hosts the largest and most productive of Arctic polynyas: North Water (NOW). Despite its significance active role in water mass formation, history NOW beyond observational era remains poorly known. We reconcile previously unassessed relationship between long-term dynamics ocean conditions by applying a multiproxy approach to two marine sediment cores from region that, together, span Holocene. Declining influence Atlantic is coeval with regional records that indicate...
Viet Nam is challenged by extensive marine plastic pollution, however, remediation efforts are hampered undefined sources to the coastal environment. This study surveyed abundance, type, and source of beached litter at seven beaches along coast Nha Trang, Nam. A total 4754 items (>2 cm) yielded a mean abundance 19.8 ± 19.5 m-2 corresponding 116 226 g DW m-2. Our results demonstrate that related fishing aquaculture constituted least 62 % weight 38 number, showing these two sectors responsible...
Abstract Sediment discharged from the Greenland Ice Sheet delivers nutrients to marine ecosystems around and shapes seafloor habitats. Current estimates of total sediment flux are constrained by observations land-terminating glaciers only. Addressing this gap, our study presents a budget derived at 30 marine-margin locations. Analyzing cores nine glaciated fjords, we assess spatial deposition since 1950. A significant correlation is established between mass accumulation rates, normalized...
Extreme storms and storm surges may induce major changes along sandy barrier coastlines, potentially causing substantial environmental economic damage. We show that the most destructive (the 1634 AD storm) documented for northern Wadden Sea within last thousand years both caused permanent breaching initiated accumulation of up to several metres marine sand. An aggradational shoal a prograding shoreface sand unit having thicknesses 8 m 5 respectively were deposited as result during subsequent...