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DTIC ADA201938: Benthic Faunal Colonization of an Offshore Borrow P... |
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by Defense Technical Information Center |
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When sediments are dredged offshore, either for a Corps |
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project or a permitted activity, borrow pits are created. |
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As part of a program to examine the environmental effects |
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of dredging, this study addresses concerns about the |
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changes that may occur in the benthic faunal associated |
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with these dredged borrow sites. Benthic faunal |
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colonization of a newly created borrow pit off Delray |
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Beach, Florida, was monitored. For comparative purposes, |
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a single sampling of an adjacent 5-year-old borrow pit |
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was conducted concurrently with the final sampling of the |
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new pit. Colonization of the new pit was rapid, with 35 |
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species and 1,081 individuals/square metre collected at |
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the initial sampling, 21 days postdredging. Abundance |
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peaked at a mean density of 1,761 individuals/ square |
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metre in the third sampling period (170 days |
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postdredging) , and species richness peaked at the fifth |
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sampling period (296 days postdredging) with 57 species. |
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Polychaete annelids and peracarid crustaceans were |
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numerically the most important initial colonizers of the |
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new pit, together comprising 89.3 percent of the fauna. |
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Species diversity (H') and equitability were lowest |
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during the first sampling period (4.21 and 0.82, |
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respectively) and, although variable, increased toward |
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the end of the study (5.10 and 0.92, respectively). |
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Relative to the old pit, the disturbed area showed |
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complete recovery based on several aspects of community |
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structure, although differences in species composition |
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were evident. |
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Date Published: 2018-02-21 11:06:56 |
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Identifier: DTIC_ADA201938 |
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Item Size: 36775227 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; Bowen, Philip R ; FLORI... |
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@chris85 |
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