A team of scientists has determined that the growing worldwide problem of increased nutrient pollution, primarily nitrogen and phosphorous, on coastal waterways has altered the ecology of Chesapeake Bay as reported in the most recent issue of Marine Ecology Progress Series.
During the last 50 years, nutrient enrichment has reduced the size of sea grass beds and lowered dissolved oxygen concentrations, both contributing to the degradation of bottom habitats. Excess nutrients can cause large algae blooms which cloud the water. When the algae bloom dies it sinks to the bottom and decays through bacterial processes that rapidly deplete dissolved oxygen. Significant increases in the organic content of 200 year-old sediment suggest stimulation of algae blooms during pre-industrial times. Lead author Dr. W. Michael Kemp, of the University of Maryland Center for Environmental Science, said "By studying long-term effects of nutrient enrichment and detailed processes by which coastal ecosystems have been altered, we will be far better positioned to effect restoration of the estuarys valuable resources."
These trends have been made even worse by declines in oyster beds, caused by overfishing and disease. The oyster was considered one of the Bays dominant bottom feeders consuming vast amounts of algae. Extensive tidal marshes, which serve as effective nutrient buffers, are now being lost due to rising sea levels thus making the problems of nutrient loading even worse.
Dispersal of Fish Eggs by Water Birds – Just a Myth?
19.02.2018 | Universität Basel
Removing fossil fuel subsidies will not reduce CO2 emissions as much as hoped
08.02.2018 | International Institute for Applied Systems Analysis (IIASA)
At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.
At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...
There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...
A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.
The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...
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