| Dredging impact on an urbanized Florida bayou: effects on benthos and algal-periphyton. | |
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MedLine Citation:
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PMID: 11706789 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Environmental effects of dredging events have been uncommonly reported for shallow, residential estuaries characteristic of the Gulf of Mexico region. The objective of this study was to determine the impact of hydraulic dredging on an urbanized estuary. Physicochemical quality, benthic community composition, whole sediment toxicity, periphytic algal community composition and trace metal tissue quality were determined prior to and after dredging. The effects on surface water pH, dissolved oxygen, and temperature were negligible but photosynthetically active radiation was decreased at several stations. Dredging significantly reduced benthic diversity and density (P < 0.05). However, the sediments were not acutely toxic to the epibenthic, Americamysis bahia (formerly Mysidopsis bahia); survival averaged 93% (post-dredging) and to 98% (pre-dredging). There were several post-dredging taxonomic structural changes in the diatom-dominated, periphyton community but differences in mean density and three diversity indices were not significant. Trace metal concentration in periphyton after dredging were reduced from an average of 4-65% and significantly for mercury, zinc and chromium in several areas. It was concluded that the environmental impact of small-scale dredging events in urbanized near-coastal areas, based on the selected parameters, are likely to be localized and of short-term environmental consequence. The choice of the target biota, response parameters and chemical analysis are important considerations in the environmental impact assessment of these periodic episodic events. |
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Authors:
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M A Lewis; D E Weber; R S Stanley; J C Moore |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Environmental pollution (Barking, Essex : 1987) Volume: 115 ISSN: 0269-7491 ISO Abbreviation: Environ. Pollut. Publication Date: 2001 |
Date Detail:
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Created Date: 2001-11-14 Completed Date: 2002-04-03 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8804476 Medline TA: Environ Pollut Country: England |
Other Details:
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Languages: eng Pagination: 161-71 Citation Subset: IM |
Affiliation:
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US Environmental Protection Agency, National Health and Environmental Effects Research Laboratory, Gulf Ecology Division, 1 Sabine Island Drive, Gulf Breeze, FL 32561-5299, USA. lewis.michael@epa.gov |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Algae
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drug effects*,
growth & development Animals Crustacea / drug effects*, growth & development Environment Environmental Monitoring Geologic Sediments / analysis, chemistry* Metals, Heavy / analysis* Seawater / chemistry* Soil Pollutants / analysis, toxicity* United States United States Environmental Protection Agency Urbanization Water Movements |
| Chemical | |
Reg. No./Substance:
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0/Metals, Heavy; 0/Soil Pollutants |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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