Featured Research

from universities, journals, and other organizations

Are Artificial Barriers Aiding Proliferation Of Invasive Aquatic Vegetation?

Date:
October 18, 2006
Source:
Dauphin Island Sea Lab
Summary:
The Mobile Bay Causeway, creating a barrier between the fresher waters of the Delta and the saltier waters of the Gulf of Mexico, 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.

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.

Related Articles


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.


Story Source:

The above story is based on materials provided by Dauphin Island Sea Lab. Note: Materials may be edited for content and length.


Cite This Page:

Dauphin Island Sea Lab. "Are Artificial Barriers Aiding Proliferation Of Invasive Aquatic Vegetation?." ScienceDaily. ScienceDaily, 18 October 2006. <www.sciencedaily.com/releases/2006/10/061013202010.htm>.
Dauphin Island Sea Lab. (2006, October 18). Are Artificial Barriers Aiding Proliferation Of Invasive Aquatic Vegetation?. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2006/10/061013202010.htm
Dauphin Island Sea Lab. "Are Artificial Barriers Aiding Proliferation Of Invasive Aquatic Vegetation?." ScienceDaily. www.sciencedaily.com/releases/2006/10/061013202010.htm (accessed October 24, 2014).

Share This



More Earth & Climate News

Friday, October 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Deep Sea 'mushroom' Could Be Early Branch on Tree of Life

Deep Sea 'mushroom' Could Be Early Branch on Tree of Life

Reuters - Innovations Video Online (Oct. 24, 2014) Miniature deep sea animals discovered off the Australian coast almost three decades ago are puzzling scientists, who say the organisms have proved impossible to categorise. Academics at the Natural History of Denmark have appealed to the world scientific community for help, saying that further information on Dendrogramma enigmatica and Dendrogramma discoides could answer key evolutionary questions. Jim Drury has more. Video provided by Reuters
Powered by NewsLook.com
Raw: Tornado Rips Roofs in Washington State

Raw: Tornado Rips Roofs in Washington State

AP (Oct. 24, 2014) A rare tornado ripped roofs off buildings, uprooted trees and shattered windows Thursday afternoon in the southwest Washington city of Longview, but there were no reports of injuries. (Oct. 24) Video provided by AP
Powered by NewsLook.com
Dances With Wolves in China's Wild West

Dances With Wolves in China's Wild West

AFP (Oct. 23, 2014) One man is on a mission to boost the population of wolves in China's violence-wracked far west. The animal - symbol of the Uighur minority there - is under threat with a massive human resettlement program in the region. Duration: 00:41 Video provided by AFP
Powered by NewsLook.com
E.U. Leaders Agree To 40% CO2 Emissions Cut By 2030

E.U. Leaders Agree To 40% CO2 Emissions Cut By 2030

Newsy (Oct. 23, 2014) The latest E.U. emissions deal calls for a 40 percent greenhouse gas cut, which leaders say sets Europe up to lead in climate negotiations next year. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins