Seasonal effects of the zebra mussel (Dreissena polymorpha) on sediment denitrification rates in Pool 8 of the Upper Mississippi River
Canadian Journal of Fisheries and Aquatic Sciences
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Abstract
Zebra mussels (Dreissena polymorpha) have altered the structure of invaded ecosystems and exhibit characteristics that suggest they may influence ecosystem processes such as nitrogen (N) cycling. We measured denitrification rates seasonally on sediments underlying zebra mussel beds collected from the impounded zone of Navigation Pool 8 of the Upper Mississippi River. Denitrification assays were amended with nutrients to characterize variation in nutrient limitation of denitrification in the presence or absence of zebra mussels. Denitrification rates at zebra mussel sites were high relative to sites without zebra mussels in February 2004 (repeated measures analysis of variance (RM ANOVA), p = 0.005), potentially because of high NO3-N variability from nitrification of high NH4+ zebra mussel waste. Denitrification rates were highest in June 2003 (RM ANOVA, p < 0.001), corresponding with the highest NO3-N concentrations during the study (linear regression, R2 = 0.72, p < 0.001). Denitrification was always N-limited, but sites without zebra mussels showed the strongest response to N amendments relative to sites with zebra mussels (two-way ANOVA, p ≤ 0.01). Examining how zebra mussels influence denitrification rates will aid in developing a more complete understanding of the impact of zebra mussels and more effective management strategies of eutrophic waters.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Seasonal effects of the zebra mussel (Dreissena polymorpha) on sediment denitrification rates in Pool 8 of the Upper Mississippi River |
| Series title | Canadian Journal of Fisheries and Aquatic Sciences |
| DOI | 10.1139/F06-002 |
| Volume | 63 |
| Issue | 5 |
| Year Published | 2006 |
| Language | English |
| Publisher | NRC Research Press |
| Publisher location | Ottawa, Ontario |
| Contributing office(s) | Upper Midwest Environmental Sciences Center |
| Description | 13 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Canadian Journal of Fisheries and Aquatic Sciences |
| First page | 957 |
| Last page | 969 |
| Country | United States |
| Other Geospatial | Upper Mississippi River |
| Google Analytic Metrics | Metrics page |