Baron, J. S. USGS,
Wolfe, A. P. INSTAAR, Alexander.Wolfe@Colorado.edu
Nydick, K. R. Natural Resource Ecology Laboratory, koren@nrel.colostate.edu
Moraska, B. M. Department of Fisheries and Wildlife Biology, bmoraska@lamar.colostate.edu
Johnson, B. R. Department of Fisheries and Wildlife Biology, brett@cnr.colostate.edu
Minear, J. T. Colorado College,

 
ECOSYSTEM RESPONSES TO ELEVATED NITROGEN DEPOSITION IN THE COLORADO FRONT RANGE
 
Nitrogen deposition from agricultural ammonia and urban nitogen oxide emissions is elevated some 2-3 times along the Colorado Front Range over more remote mountain locations. Some, but not all, high elevation lakes have nitrate concentrations that range 10-40 microequivalents/L throughout the year. Surveys of 183 lake and stream sites for chemical composition in 1982 and again in 1997 do not show any sites where nitrate status has changed over 15 years. However, lake sediment records reveal differences in N isotopic signatures and diatom community composition in lakes with different nitrate concentrations. Micro- and macro-benthos are under study to see whether there are differences based on lake chemistry.
 
Day: Wednesday, Feb. 3
Time: 11:30 - 11:45am
Location: Sweeney Center
 
Code: SS50WE1130S