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.
From the Arctic to the tropics: researchers present a unique database on Earth’s vegetation
20.11.2018 | Martin-Luther-Universität Halle-Wittenberg
Fading stripes in Southeast Asia: First insight into the ecology of an elusive and threatened rabbit
20.11.2018 | Forschungsverbund Berlin e.V.
Max Planck researchers revel the nano-structure of molecular trains and the reason for smooth transport in cellular antennas.
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Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.
Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.
19.11.2018 | Event News
09.11.2018 | Event News
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20.11.2018 | Life Sciences
20.11.2018 | Life Sciences
20.11.2018 | Physics and Astronomy