KAPLAN, WELKER, and KRAUS: EFFECTS OF DREDGING 



loss of productivity represented by the spoil 

 areas which had inundated 10.87 ha of marsh, 

 49,497.31 kg of plant matter were removed from 

 the trophic cycle of Goose Creek in the post- 

 dredging year. 



Replacement by houses or Phragmites marsh 

 would tend to fix this loss on a permanent basis. 



In summary, reductions in the productivity of 

 Goose Creek were induced by the dredging pro- 

 cess. Recovery to pre-dredging levels had not 

 occurred 11 mo after dredging. Arguments were 

 proposed which suggested that changes in current 

 velocity and the concomitant modifications in 

 substratum type represented permanent changes 

 which would affect the future productivity of the 

 bay by changing the nature of the habitat. 



Spoil disposal and land usage changes brought 

 about an enhanced land value of the disposal 

 areas, stimulating the development of the peri- 

 phery of the bay, removing or depleting the marsh 

 as an energy source available to the aquatic 

 environment. These changes also were of a perma- 

 nent nature. 



ACKNOWLEDGMENTS 



This study was supported in part by a grant 

 from Suffolk County, N.Y. The authors are grate- 

 ful to the following persons for assistance in 

 obtaining samples: John Dinaro, Paul Laucher, 

 Ed Wainwright, Pat Langstone, Paul Salomans, 

 and Harry White. Edwin J. Sherrill, Jr., designed 

 the vessel and saw to its construction. John 

 Black supplied data on water chemistry. Walter 

 Smith originated the project. 



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