Antropogenically induced changes in sediment and biogenic silica fluxes in Chesapeake Bay
Geology
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Abstract
Sediment cores as long as 20 m, dated by 14C, 210Pb, and 137Cs methods and pollen stratigraphy, provide a history of diatom productivity and sediment-accumulation rates in Chesapeake Bay. We calculated the flux of biogenic silica and total sediment for the past 1500 yr for two high-sedimentation-rate sites in the mesohaline section of the bay. The data show that biogenic silica flux to sediments, an index of diatom productivity in the bay, as well as its variability, were relatively low before European settlement of the Chesapeake Bay watershed. In the succeeding 300-400 yr, the flux of biogenic silica has increased by a factor of 4 to 5. Biogenic silica fluxes still appear to be increasing, despite recent nutrient-reduction efforts. The increase in diatom-produced biogenic silica has been partly masked (in concentration terms) by a similar increase in total sediment flux. This history suggests the magnitude of anthropogenic disturbance of the estuary and indicates that significant changes had occurred long before the twentieth century.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Antropogenically induced changes in sediment and biogenic silica fluxes in Chesapeake Bay |
| Series title | Geology |
| DOI | 10.1130/0091-7613(2003)031<0071:AICISA>2.0.CO;2 |
| Volume | 31 |
| Issue | 1 |
| Year Published | 2003 |
| Language | English |
| Publisher | Geological Society of America |
| Contributing office(s) | Woods Hole Coastal and Marine Science Center |
| Description | 4 p. |
| First page | 71 |
| Last page | 74 |
| Country | United States |
| State | Maryland, Virginia |
| Other Geospatial | Chesapeake Bay |
| Google Analytic Metrics | Metrics page |