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dc.contributor.authorReilly, Francis J.-
dc.contributor.authorBellis, Vincent J., 1938--
dc.descriptionMiscellaneous Report-
dc.descriptionAbstract: the winter and spring of 1977-78 approximately 1600 meters of high-energy sandy ocean beach at Fort Macon State Park was nourished with sediments dredged from Morehead City State Port Harbor. This report is the result of a 20-month study of the nourished beach and a comparable unnourished beach. Shannon-Weaver's Species Diversity Indexes ranged from 0.00 to 0.64 on both beaches during the 6 months before nourishment. Generally, Shannon-Weaver values were higher on the nourishment beach before nourishment due to the higher numbers of species present. High species number is attributed to the close proximity of the nourishment beach to Beaufort Inlet. After nourishment began the unnourished beach maintained the same diversity and density patterns that both beaches had displayed before nourishment although there was seasonal variation. The species diversity on the nourished beach became undefined at the onset of nourishment because the density of all species dropped to zero. This situation remained at the nourished beach until nourishment activities ceased. During the nourishment activities, the Fort Macon beach was subdivided into two segments (the area already nourished and the area not yet nourished). While all organisms in the nourished area disappeared, no increased population densities were noted from the adjacent unnourished area. Near the end of nourishment activities this unnourished area showed both a drastic reduction in diversity and a change in species composition, thus indicating a certain edge effect of nourishment. A special transect designed to monitor rate of recovery after nourishment indicated that a speedy recovery largely depended on recruitment from pelagic larval stocks. It also seemed to indicate that high turbidities associated with nourishment can prevent this recruitment. Lastly it showed that those species unable to recolonize through pelagic larval recruitment returned to the area much more slowly. A comparison of the before-and-after nourishment data at Fort Macon showed little evident change in the densities of the most dominant secondary producer the mole crab, Emerita talpoida; however, when comparing before-and-after size class data with the comparison beach the effects of nourishment are obvious. While a complex age and size class array was evident before nourishment at Fort Macon and after nourishment at the comparison beach, only young of the year age classes were observed for any intertidal species present at Fort Macon. This lack of older and larger individuals and consequently biomass was reflected in lower densities of important migrating consumers at the study site. Although the populations of these consumers were probably not affected, they were noticeably absent from the nourished area during and after nourishment; they probably had moved to adjacent areas. The beach showed signs of recovery. Only Emerita talpoida returned in near-normal density; all other numerically important species also returned but in significantly lower density.-
dc.publisherCoastal Engineering Research Center (U.S.)-
dc.publisherEngineer Research and Development Center (U.S.)-
dc.relation.ispartofseriesMiscellaneous report (Coastal Engineering Research Center (U.S.)) ; no. 83-3.-
dc.rightsApproved for Public Release, Distribution is Unlimited-
dc.sourceThis Digital Resource was created from scans of the Print Resource-
dc.subjectBeach nourishment-
dc.subjectBogue Banks (N.C.)-
dc.subjectIntertidal zone-
dc.titleThe ecological impact of beach nourishment with dredged materials on the intertidal zone at Bogue Banks, North Carolina-
Appears in Collections:Miscellaneous Report

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