||Stratigraphic Evidence of Human turbance in Some Chesapeake Bay Tributaries.
Brush, Grace S. ;
Davis, Frank W. ;
||Johns Hopkins Univ., Baltimore, MD. Dept. of Geography and Environmental Engineering.;Environmental Protection Agency, Annapolis, MD. Chesapeake Bay Program.
||EPA-R-805962 ;EPA-R-806680; EPA-600/3-83-052;
Chesapeake Bay ;
Land use ;
Core analysis ;
Environmental impacts ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
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.