||Classification of lakes in the coast range ecoregion with respect to nutrient processing.
Vaga, R. M. ;
Petersen, R. R. ;
Herlihy, A. T. ;
||Environmental Protection Agency, Seattle, WA. Region X. ;Portland State Univ., OR. Environmental Sciences and Resources. ;Oregon State Univ., Corvallis. Dept. of Fisheries and Wildlife.
||U.S. Environmental Protection Agency, Region 10, Office of Water & Watersheds,
Water quality--Northwest, Pacific ;
Lakes--Northwest, Pacific ;
Water quality ;
Coastal areas ;
Water pollution ;
Water resources ;
||Region 10 Library/Seattle,WA
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||vi,40 p. : iil., maps ; 26 cm.
This report presents one methodology to classify natural lakes with respect to nutrient processing. Lakes in the Coast Range Ecoregion were inventoried and lakes greater than 4 ha in surface area were chosen as the target population. A methodology was then developed based upon expert opinion to categorize lakes in the ecoregion based upon basic limnological principles. The categories were developed without recourse to nutrient data. Analysis of total P, total N, chlorophyll and Secchi was carried out for (1) the Coast Range lakes as a whole and (2) for each lake category. Results suggest that these parameters have inherently different variability among lake categories which affects their utility in developing numeric nutrient criteria.