Main Title |
Ecosystem Changes in Lakes Erie and Ontario. |
Author |
Thomas, Nelson A. ;
|
CORP Author |
Environmental Research Lab.-Duluth, MN. |
Year Published |
1981 |
Report Number |
EPA-600/D-82-286; |
Stock Number |
PB82-223900 |
Additional Subjects |
Biomass ;
Nutrients ;
Lake Erie ;
Lake Ontario ;
Biological productivity ;
Phosphorus ;
Algae ;
Cyanophyta ;
Zooplankton ;
Toxicity ;
Food supply ;
Contamination ;
Fishes ;
Birds ;
Metals ;
Organic compounds ;
Public health ;
Reprints ;
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB82-223900 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
22p |
Abstract |
All of the Great Lakes are changing; however, the lower lakes, because of their increased productivity, are changing at a much faster rate. This condition is reflected in the overall nutrient and biomass content of the individual lakes. The nutrient concentrations of the lower lakes are 4-8 times higher than those in the upper lakes. The increase in phosphorus in the lower lakes has resulted in dramatic increases in phytoplankton biomass, as well as in shifts in the biomass to a greater percentage of bluegreen algae. Changes have occurred in the zooplankton communities. Changes in the biota of a lake can result from three major types of influences. The first is change in the physical environment. The second type of change is associated with direct toxicity. The third type of influence, and, probably, the most prevalent today, are changes resulting from altered food supplies. |
Supplementary Notes |
Pub. in Proceedings of the Conference on Changes in the Biota of Lakes Erie and Ontario, Bulletin of the Buffalo Society of Natural Sciences, v25n4 p1-20 1981. |
Title Annotations |
Reprint: Ecosystem Changes in Lakes Erie and Ontario, |
PUB Date Free Form |
1981 |
Category Codes |
8H; 48G; 68D |
NTIS Prices |
PC A02/MF A01 |
Primary Description |
600/03 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
323816778 |
Origin |
NTIS |
Type |
CAT |