Record Display for the EPA National Library Catalog

RECORD NUMBER: 220 OF 241

OLS Field Name OLS Field Data
Main Title Stratigraphic Evidence of Human turbance in Some Chesapeake Bay Tributaries.
Author Brush, Grace S. ; Davis, Frank W. ;
CORP Author Johns Hopkins Univ., Baltimore, MD. Dept. of Geography and Environmental Engineering.;Environmental Protection Agency, Annapolis, MD. Chesapeake Bay Program.
Year Published 1983
Report Number EPA-R-805962 ;EPA-R-806680; EPA-600/3-83-052;
Stock Number PB83-225292
Additional Subjects Diatoms ; Disturbances ; Sediments ; Stratigraphy ; Chesapeake Bay ; Geochronology ; Land use ; Humans ; Seeds ; Distribution(Property) ; Ferns ; Core analysis ; Environmental impacts ; Pollen ; History ; Tributaries
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB83-225292 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 37p
Abstract
Response of diatom (algal) and submerged macrophyte (angiospermous) populations to disturbance in some Chesapeake Bay tributaries over the last few centuries is interpreted from abundance of diatom frustules and presence of macrophyte seeds preserved in dated estuarine sediments. The historical record of disturbance during the time period considered includes land clearance and urbanization of the watershed resulting from human activity, as well as from periodic storms. The stratigraphic record indicates that both the diatom and submerged macrophyte populations were stable prior to European settlement. With the onset of land clearance, dramatic changes are registered that include shifts in total numbers of cells and seeds as well as in species composition. The kind of response appears to be unique for a particular type of disturbance.