Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A salinity study in the Mobile Delta region

17.10.2006
Are man-made barriers aiding the proliferation of invasive aquatic vegetation?

Habitat modifications are among mankind's most pervasive alterations of our nation's estuarine ecosystems.

When such modifications are extensive, as is the case for the Mobile Bay Causeway, they can alter patterns of natural hydrography. Among the possible consequences of the Causeway is the reduction of water exchange between the fresh water in the lower reaches of Mobile-Tensaw Delta, and the saltier waters of the Gulf of Mexico. If true, this barrier may have created persistent low salinity conditions that local conservationists believe have provided refuge for an exotic species of submerged aquatic vegetation, the Eurasian Milfoil (Myriophyllum spicatum) to survive in during periods when salinity is high throughout this estuary.

When salinity is low, milfoil fragments from these freshwater refuges end up in nearby estuarine grassbeds, where they subsequently outgrow and competitively displace native submerged grasses.

To test these hypotheses, Dr. John Valentine and Marine Technician Susan Sklenar, both of the Dauphin Island Sea Lab (DISL) in Alabama, are currently comparing the results of salinity tolerance experiments they have conducted using milfoil at the DISL with two years of field data which document salinity patterns within the upper reaches of Mobile Bay.

The preliminary results of these experiments suggest that only the most extreme salinities, those observed during hurricane landfalls in the northern Gulf of Mexico, are lethal to milfoil.

"Right after Hurricane Katrina, we noticed that milfoil was not as abundant in those places where it used to be plentiful," recounts Dr. Valentine. "Whether it was the turbidity from the storm or the salinity from waters crashing over the MBC, we're hoping these experiments will be able to help determine the cause."

In the coming year, Dr. Valentine and his colleagues will be conducting additional field experiments to determine if in fact milfoil will outcompete native grasses for habitat within this estuary. It is hoped that these experiments, when completed, will allow DISL to make data-based recommendations for habitat restoration later next year.

Lisa Young | EurekAlert!
Further information:
http://www.disl.org

More articles from Studies and Analyses:

nachricht Rutgers-led innovation could spur faster, cheaper, nano-based manufacturing
14.02.2018 | Rutgers University

nachricht New study from the University of Halle: How climate change alters plant growth
12.01.2018 | Martin-Luther-Universität Halle-Wittenberg

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Demonstration of a single molecule piezoelectric effect

Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale

Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...

Im Focus: Hybrid optics bring color imaging using ultrathin metalenses into focus

For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.

But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...

Im Focus: Stem cell divisions in the adult brain seen for the first time

Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.

The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...

Im Focus: Interference as a new method for cooling quantum devices

Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters

Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...

Im Focus: Autonomous 3D scanner supports individual manufacturing processes

Let’s say the armrest is broken in your vintage car. As things stand, you would need a lot of luck and persistence to find the right spare part. But in the world of Industrie 4.0 and production with batch sizes of one, you can simply scan the armrest and print it out. This is made possible by the first ever 3D scanner capable of working autonomously and in real time. The autonomous scanning system will be on display at the Hannover Messe Preview on February 6 and at the Hannover Messe proper from April 23 to 27, 2018 (Hall 6, Booth A30).

Part of the charm of vintage cars is that they stopped making them long ago, so it is special when you do see one out on the roads. If something breaks or...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on High Temperature Shape Memory Alloys (HTSMAs)

15.02.2018 | Event News

Aachen DC Grid Summit 2018

13.02.2018 | Event News

How Global Climate Policy Can Learn from the Energy Transition

12.02.2018 | Event News

 
Latest News

Fingerprints of quantum entanglement

16.02.2018 | Information Technology

'Living bandages': NUST MISIS scientists develop biocompatible anti-burn nanofibers

16.02.2018 | Health and Medicine

Hubble sees Neptune's mysterious shrinking storm

16.02.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>