Please use this identifier to cite or link to this item:
https://hdl.handle.net/11681/4661Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Hirsch, Nina D. | - |
| dc.contributor.author | DiSalvo, Louis H. | - |
| dc.contributor.author | Peddicord, Richard K. | - |
| dc.creator | University of California, Berkeley. Naval Biosciences Laboratory | - |
| dc.date.accessioned | 2016-03-16T22:19:01Z | - |
| dc.date.available | 2016-03-16T22:19:01Z | - |
| dc.date.issued | 1978-08 | - |
| dc.identifier.govdoc | Technical Report DS-78-5 | - |
| dc.identifier.uri | http://hdl.handle.net/11681/4661 | - |
| dc.description | Technical Report | - |
| dc.description.abstract | This report synthesizes data from the U. S. Army Corps of Engineers' Dredged Material Research Program, Task 1D. Task 1D consisted of six research projects (work units) that investigated the direct and indirect effects of dredging and disposal of dredged material on aquatic organisms. Determination of potential environmental effects of dredging and disposal, in spite of research conducted to date, is still in preliminary stages due to the multiplicity of variables involved. Direct effects of dredging and disposal are restricted to the immediate area of operation. They include removal of organisms at dredging sites and burial of organisms at disposal sites. Data indicate that the recovery of disturbed sites occurs over periods of weeks, months, or years depending on the type of environment. Possible mechanisms of recolonization include lateral and vertical migration of organisms and larval recruitment. Disturbed sites may be recolonized by opportunistic species which are not normally the dominant species occurring at nearby undisturbed sites. Most organisms studied were relatively insensitive to the effects of sediment suspensions in the water. Dredging-induced turbidity is probably not of major environmental concern in most cases, but may be an aesthetic problem. The formation of fluid mud due to dredging and disposal is a poorly understood process and is of probable environmental concern. Available data indicate that suspensions of highly contaminated sediments have a greater potential for adverse effects than uncontaminated or lightly contaminated sediments. Bioavailability of sediment-sorbed heavy metals is low. Release of sediment-associated heavy metals and their uptake into organism tissues have been found to be the exception rather than the rule. Research results suggest that there is little or no correlation between the bulk sediment content of heavy metals and environmental impact. Oil and grease residues, like the heavy metals, seem tightly bound to sediment particles and accumulation of these residues by organisms is minimal. The diversity of variables that have the potential for direct and indirect effects on aquatic life argues for an integrated, whole-sediment bioassay, using sensitive test organisms. Such a procedure is currently under development by the Environmental Protection Agency and the Corps of Engineers and should uncover site-specific toxicity problems which can be addressed by appropriate chemical testing and biological evaluation of dredged material. | - |
| dc.description.sponsorship | Dredged Material Research Program (U.S.) | - |
| dc.format.extent | 46 pages / 6.13 MB | - |
| dc.format.medium | - | |
| dc.publisher | U. S. Army Engineer Waterways Experiment Station | - |
| dc.relation | http://acwc.sdp.sirsi.net/client/en_US/search/asset/1003886 | - |
| dc.relation.ispartofseries | Technical Report (Dredged Material Research Program (U.S.)) ; no. DS-78-5 | - |
| dc.rights | Approved for Public Release; Distribution is Unlimited | - |
| dc.source | This Digital Resource was created from scans of the Print Resource | - |
| dc.subject | Dredging--Environmental aspects--United States | - |
| dc.subject | Dredging spoil | - |
| dc.subject | Dredged material | - |
| dc.subject | Suspended sediments | - |
| dc.subject | Turbidity | - |
| dc.subject | Water--Microbiology | - |
| dc.title | Effects of dredging and disposal on aquatic organisms | - |
| dc.type | Report | en_US |
| Appears in Collections: | Technical Report | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| TR-DS-78-5.pdf | 6.13 MB | Adobe PDF |  View/Open |