present, but does not represent a compilation of ecological data, although 

 some passages are on an ecological nature. This study establishes a basic 

 flora on which ecological analysis may begin. 



169. TARPLER, W.H., Jr., LAUDER, D.E., and WILSON, A.J., "Evaluation of the 

 Effects of Channelization on Fish Populations in North Carolina Coastal 

 Plains Streams," Hearing, 92d Cong., 1st Sess. , 1971, pp. 188-201. 



This study was designed to determine the degree of damage to fish 

 populations resulting from channelization and to determine the rate of recovery 

 if the damage was significant. The study points out the detrimental effects 

 stream channelization has on fish populations and on the flora and bottom 

 fauna of streams. The study also indicates that following channelization, 

 and with no channel maintenance or further alternations of the streambed, 

 banks, forest canopy, or aquatic vegetation, nature can restore a stream and 

 its fish population to a stage reasonably near its natural condition over 

 a period of approximately 15 years. 



170. TARVER, J.W., and DUGAS, R.J., "A Study of the Clam, Rangia auneata, in 

 Lake Pontchartrain and Lake Maurepas, Louisiana," Report No. IVJIFC-Tech- 

 nical Bulletin 5, Louisiana Wildlife and Fisheries Commission, Division 

 of Oysters, Water Bottoms, and Seafoods, New Orleans, La., Feb. 1973. 



Samples of Rangia ouneata were taken by using a Peterson grab and modified 

 oyster dredge throughout Lakes Pontchartrain and Maurepas to determine the 

 occurrence, distribution, and density of clam populations. Hydrological, 

 sedimentological, and plankton samples were analyzed in an effort to determine 

 some of the factors affecting the distribution, density, and growth of R. 

 avneata. Mortality and the effects of dredging operations on the environment 

 are briefly discussed. Annual shell production and overfishing factors are 

 discussed and recommendations to the industry are also proposed. 



171. TAYLOR, J.L., HALL, J.R., and SALOMAN, C.H., "Mollusks and Benthic Environ- 

 ments in Hillsborough Bay, Florida," Fishery Bulletin, Vol. 68, No. 2, 

 Apr. 1970, pp. 191-202. 



Analysis of benthic mollusks and sediments at 45 stations showed that 

 the diversity and abundance of mollusks was affected by bottom conditions, 

 which were influenced in varying degrees by domestic and industrial pollution 

 and dredging. Nineteen stations had no living mollusks, 18 stations had one 

 or more of the four mollusk species that were predominant, and 8 stations had 

 mollusks well represented by numerous species and large numbers of individuals. 

 Stations with no living mollusks were termed unhealthy; others were designated 

 marginal or healthy on the basis of the mollusks present. From station data, 

 isopleths connecting similar areas indicated that 42 percent of the bay bottom 

 was unhealthy, 36 percent marginal, and 22 percent healthy. Infrequent occur- 

 rence of the American oyster {Crassostrea virginica) further suggests that the 

 major part of Hillsborough Bay was seriously contaminated. An appendix has a 

 checklist of the 64 species of mollusks collected in the bay. 



172. TAYLOR, J.L., and SALOMAN, C.H., "Some Effects of Hydraulic Dredging and 

 Coastal Development in Boca Ciega Bay, Florida," Fishery Bulletin, Vol. 

 67, No. 2, Oct. 1968, pp. 213-241. 



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