Environmental Assessment. Dredged Material Thalweg Placement Site Mississippi River Miles 561.0 - 561.4 Island 241, Pool 12

1992 ◽  
Author(s):  
ARMY ENGINEER DISTRICT ROCK ISLAND IL
Keyword(s):  
Environmental Assessment ◽  
Mississippi River ◽  
Dredged Material

Beneficial Use of Mississippi River Navigation Dredged Material

Ports 2016 ◽  
2016 ◽  
Author(s):  
Brett McMann ◽  
Paul Tschirky ◽  
Mike Schulze ◽  
Ehab Mesehle
Keyword(s):  
Mississippi River ◽  
Dredged Material ◽  
Beneficial Use

Environmental Assessment of Poplar Island Dredged Material Placement Site, Talbot County, Maryland

Estuaries ◽  
1999 ◽  
Vol 22 (3) ◽  
pp. 770 ◽  
Author(s):  
V. P. Dalal ◽  
J. E. Baker ◽  
R. P. Mason
Keyword(s):  
Environmental Assessment ◽  
Dredged Material ◽  
Talbot County

The Effect of Exogenous Fluoride on the Calcium PUMP, Ciliary Activity, and Shell Formation of the Fingernail Clam, Musculium Transversum

1982 ◽  
Vol 40 ◽  
pp. 58-59
Author(s):  
Anthony Paparo ◽  
Judy A. Murphy ◽  
Robert Dean
Keyword(s):  
Mississippi River ◽  
Calcium Pump ◽  
Bottom Fauna ◽  
Ciliary Activity ◽  
Shell Formation ◽  
Middle Reach ◽  
Shell Matrix ◽  
Fingernail Clams ◽  
Ca Carbonate

In the mid-1950's, fingernail clams virtually disappeared from a 100-mile section of the IL River, a tributary of the Mississippi River, due to unknown causes. A survey of the bottom fauna of the IL River in 1979, revealed that the clams were still absent from the middle reach of the River, where they had been abundant prior to the die-off in the 1950's. Some factor(s) in the River currently prevent the clams from recolonizing areas where they were formerly abundant. Recently, clams exposed to fluoride developed abnormal grooves in the shell matrix. Fluorides are known to be protoplasmic poisons removing essential body calcium by precipitation. Since the shell consists primarily of Ca carbonate, this investigation examines the possible role of fluoride on shell formation and the poisoning of the Ca pump which can directly inhibit lateral ciliary activity on the gill.

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