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Rights Statements InC/1.0 , Open Access
Journal article
Benthic invertebrates and sediment characteristics in a shallow navigation channel of the Lower Columbia River, before and after dredging
Northwest science., Vol.72(2), pp.116-126
1998
Handle:
https://hdl.handle.net/2376/1220
Abstract
Little is known about the impact of dredging on benthic invertebrates in navigation channels of the lower Columbia River. To help fill this informational void, we conducted benthic invertebrate and sediment studies in a shallow navigation channel in the river before and after dredging. Benthic invertebrate and sediment samples were collected with a 0.1-m2 Van Veen grab sampler at seven stations in the Wahkiakum County Ferry Channel, Washington (River Kilometer 70), and at an upstream reference area in 1993-1995. No significant effects (P > 0.05) of the ferry channel dredging project on Corbicula fluminea, Ceratopogonidae larvae, Corophium spp., or total benthic invertebrate densities were detected in the statistical analysis, although benthic invertebrate densities were significantly different (P < 0.05) between surveys and areas for some organisms. During all eight surveys, Corbicula fluminea, Corophium spp., and Ceratopogonidae (Diptera) larvae were generally the most common benthic invertebrates in both the ferry channel and the reference area. Two measures of community structure, Diversity (H) and Equitability (E), were calculated for each area for each survey. No significant effects (P > 0.05) of the ferry channel dredging project on the benthic invertebrate community structure, as measured by H and E, were detected. No significant effects (P > 0.05) of the ferry channel dredging project on sediment median grain size or percent volatile solids were detected. Results from this study will provide information to aquatic resource agencies that assess the potential environmental effects of dredging in similar habitats of the lower Columbia River
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Details
- Title
- Benthic invertebrates and sediment characteristics in a shallow navigation channel of the Lower Columbia River, before and after dredging
- Creators
- George T. McCabe (Author)Susan A. Hinton (Author)Robert L. Emmett (Author)
- Publication Details
- Northwest science., Vol.72(2), pp.116-126
- Academic Unit
- Northwest Science
- Publisher
- WSU Press
- Identifiers
- 99900501913201842
- Copyright
- In copyright ; openAccess ; http://rightsstatements.org/vocab/InC/1.0/ ; http://purl.org/eprint/accessRights/OpenAccess
- Language
- English
- Resource Type
- Journal article