Ryals, K. G. Utah State University, Department of Fisheries and Wildlife, slmb3@cc.usu.edu
Luecke, C. G. Utah State University, Department of Fisheries and Wildlife, luecke@cc.usu.edu

 
STABLE ISOTOPE ANALYSIS AS AN INDICATOR OF WALLEYE PRODUCTIVITY IN FOUR UTAH RESERVOIRS.
 
Analysis of ratios of stable isotopes can provide information on food web structure and trophic interactions in aquatic ecosystems. The relationship between isotope ratios and walleye production was examined in four Utah reservoirs. The dominant organisms from each food web were analyzed for nitrogen and carbon isotopic composition. Our results suggest an association between stable isotope ratios and relative productivity of walleye fisheries. Our analysis indicated that trophic position of walleye varied among reservoirs. Growth rates of walleye were highest in reservoirs where walleye occupied a high position on the food chain. Walleye growth was also highest in food webs dominated by pelagic rather than benthic prey.
 
Day: Wednesday, Feb. 3
Time: 11:45 - 12:00pm
Location: Eldorado Hotel
 
Code: SS32WE1145E