Hurricane Katrina made landfall August 29, 2005 becoming the costliest ($75 billion) and one of the deadliest (nearly 2,000 human lives lost) hurricanes in U.S. history. With the nation still reeling from Katrina, Hurricane Rita hit on September 24, 2005, causing $10 billion in damage but taking a far less direct toll on human lives. The duo's ecological consequences were also considerable: storm surges flooded coastal areas. Powerful winds felled forests in south Louisiana and Mississippi, havens for wildlife and migratory birds. Saltwater and polluted floodwaters from New Orleans surged into Lake Pontchartrain. Taking stock nearly a year later, experts from the Gulf Coast region will address the storms' ecological consequences and will offer insights on how ecological knowledge can help mitigate damage from future hurricanes.
"Not only is the City of New Orleans built on reclaimed wetlands that have subsided by up to 5 meters, over 25 percent of coastal wetlands disappeared in the 20th century," says John Day (Louisiana State University). Day, one of the symposia's presenters, argues that serious wetland restoration plans must close or restrict the Mississippi River Gulf Outlet, a canal that contributed to the flooding of New Orleans and that disconnects the river from its delta plain. Wetlands help stem storm surges and diffuse powerful winds.
Complementing Day's argument, Paul Keddy (Southeastern Louisiana University) believes residents in the Gulf Coast states will have to decide if they want "business as usual" or a dramatic change in the way people accept the limitations and realities of dynamic coastal areas. During his presentation, Keddy will lay out what he sees as the connections between hurricanes, human irrationality, and Gulf Coast ecosystems. "From the American dust bowl to the collapse of the Canadian cod fishery, people have chosen development trajectories that are catastrophic in the longer term," he says.
Gary Shaffer (Southeastern Louisiana University) will suggest some concrete wetlands restoration steps that he believes will need to go hand-in-hand with human-made flood control barriers. "Bald cypress - water tupelo swamps are particularly effective at dampening forward progress of both floodwaters and winds," he notes. Shaffer believes that cypress and tupelo seedlings could achieve 10 meter heights within a single decade and serve as major storm damage reduction agents.
Looking specifically at Louisiana's Lake Pontchartrain, Carlton Dufrechou's (Lake Pontchartrain Basin Foundation, a non-profit organization dedicated to restoring and preserving the Lake Pontchartrain Basin) presentation will include post-storm satellite imagery that suggests that Hurricane Katrina may have destroyed over 60 square miles of the lake's wetlands in a mere 24 hour period. "As more coastal areas disappear, residents in the region become more vulnerable to the effects of tropical storms and hurricanes," says Dufrechou. On a brighter note, however, the lake's water quality appears to have recovered to pre-Katrina conditions, in spite of being the recipient of nearly nine billion gallons of highly contaminated water pumped out of New Orleans and into the lake.
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18.05.2017 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig
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16.05.2017 | International Institute for Applied Systems Analysis (IIASA)
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
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