Aquatic Disposal Field Investigations, Duwamish Waterway Disposal Site, Puget Sound, Washington. Appendix G. Benthic Community Structural Changes Resulting from Dredged Material Disposal, Elliott Bay Disposal Site

Benthic community changes resulting from the open-water disposal of 114,350 cum of Duwamish River dredged material at the Elliott Bay, Puget Sound, deep-water (approximately 60 m) experimental disposal site, 7 February 1976 to 6 March 1976, were investigated. Analyses were performed on macrofaunal d...

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Bibliographic Details
Main Author: Bingham,C Rex
Format: Report
Language:English
Subjects:
AQUATIC ORGANISMS
Civil Engineering
COLONIES(BIOLOGY)
Construction Equipment, Materials & Supplies
DEEP WATER
DREDGED MATERIALS
Elliott Bay disposal site
ENVIRONMENTAL MANAGEMENT
LPN-DMRP-1A10B
OCEAN WASTE DISPOSAL
OCEANOGRAPHIC DATA
PELECYPODA
PUGET SOUND
STATISTICAL ANALYSIS
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Summary:Benthic community changes resulting from the open-water disposal of 114,350 cum of Duwamish River dredged material at the Elliott Bay, Puget Sound, deep-water (approximately 60 m) experimental disposal site, 7 February 1976 to 6 March 1976, were investigated. Analyses were performed on macrofaunal density, species composition, biomass, biomass/individual, frequency of occurrence, and species diversity, at several taxonomic levels for one predisposal sampling and five postdisposal samplings at 10 days, and 1, 3, 6 and 9 months after disposal. These analyses were performed on data from stratified (central, side, and corner) disposal site stations and two (east and west) reference sites. Taxonomic levels investigated were total benthic macrofauna, macrofaunal groups (gastropods, pelecypods, errantian worms, sedentarian worms, and miscellaneous species), and individual species. Most individual species showed seasonal trends (both graphically and statistically) at the reference sites and the corner disposal site stations, indicating that rate of benthic macrofaunal recovery from dredged material disposal may be affected by seasonal parameters. Therefore, timing of dredged material disposal on similar sites may be important in reducing the severity of impact on the benthic macrofauna. Report on Dredged Material Research Program. Appendix G to final rept. dated Jun 78, AD-A058 445.