Document Detail

Dredging impact on an urbanized Florida bayou: effects on benthos and algal-periphyton.
MedLine Citation:
PMID:  11706789     Owner:  NLM     Status:  MEDLINE    
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.
M A Lewis; D E Weber; R S Stanley; J C Moore
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Environmental pollution (Barking, Essex : 1987)     Volume:  115     ISSN:  0269-7491     ISO Abbreviation:  Environ. Pollut.     Publication Date:  2001  
Date Detail:
Created Date:  2001-11-14     Completed Date:  2002-04-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8804476     Medline TA:  Environ Pollut     Country:  England    
Other Details:
Languages:  eng     Pagination:  161-71     Citation Subset:  IM    
US Environmental Protection Agency, National Health and Environmental Effects Research Laboratory, Gulf Ecology Division, 1 Sabine Island Drive, Gulf Breeze, FL 32561-5299, USA.
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MeSH Terms
Algae / drug effects*,  growth & development
Crustacea / drug effects*,  growth & development
Environmental Monitoring
Geologic Sediments / analysis,  chemistry*
Metals, Heavy / analysis*
Seawater / chemistry*
Soil Pollutants / analysis,  toxicity*
United States
United States Environmental Protection Agency
Water Movements
Reg. No./Substance:
0/Metals, Heavy; 0/Soil Pollutants

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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