||Summer total phosphorus in lakes : a map of Minnesota, Wisconsin, and Michigan, USA /
Omernik, James M., ;
Omernik, J. M. ;
Larsen, D. P. ;
Rohm, C. M. ;
Clarke, S. E.
||Northrop Services, Inc., Corvallis, OR.;Corvallis Environmental Research Lab., OR.
Eutrophication--Lake States--Maps. ;
Water--Phosphorus content--Lake States--Maps.
Food chains ;
Seasonal variations ;
Water chemistry ;
Trophic level ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||pages 815-825 : illustrations ; 28 cm
A map of summer total phosphorus in lakes has been compiled for Minnesota, Wisconsin, and Michigan to clarify regional patterns in attainable lake trophic state. Total phosphorus was used as a measure of lake trophic state because: phosphorus plays a central role in controlling the overall fertility of most lakes, total phosphorus values are available for a great number of lakes, and phosphorus is measured in a consistent manner. The maps were compiled using patterns of total phosphorus data and observed associations between these data and geographic characteristics including physiography, land use, geology, and soils. Regions depicted on the map represent areas of similarity in phosphorus concentrations in lakes, or similarity in the mosaic of values, as compared to adjacent areas. Within each region, differences in total phosphorus can be compared to natural and anthropogenic factors to determine the types of lakes representative of each region, the factors associated with differences in quality, and the realistically attainable phosphorus levels for each type of lake. (Copyright (c) 1988 Springer-Verlag New York Inc.)
Accompanied by map in original issue of Environmental management. Includes bibliographical references (pages 824-825).