Sierra Nevada Aquatic Research Laboratory

17 Sep, 02 AM - 18 Sep, 10 AM

This application is for an initial reconnaissance visit. If I apply to do research, I will use the artificial channels at SNARL to simultaneously parameterize and test a model that describes transformations of dissolved inorganic nitrogen (NOx and NH4) in water as it fluxes through subsurface flow paths beneath bedforms. I will also simultaneously conduct a third experiment to determine the effects of sediment sizes on algal productivity and on direct and indirect trophic interactions between subsurface biofilms and surface-dwelling organisms. Riffle sediments will be removed, sorted and reapplied as treatments of different mean and standard deviation of sediment sizes for each channel. I will also fill PVC pipes (6-inch diameter) with sediments matching each channel's treatment mix and submerge them in the artificial channels. Pipes will serve as controlled hyporheic flow paths and will be used to parameterize a hydrological reactive transport model. The model will be tested in the artificial channels with background and possibly added dissolved inorganic nitrogen. Algae, invertebrates and possibly trout cultured in the channels will be sampled to determine growth and/or abundance, species, etc. Trophic relationships will be determined with lipid biomarkers and possibly stable isotope labels applied to bacteria.

Visit #8120 @Sierra Nevada Aquatic Research Laboratory

Approved

Under Project # 5775 | Research

Streambed sediments and productivity

graduate_student - University of California, Davis

Reservation Members(s)

Group of 15 Graduate Student Sep 17 - 18, 2005 (2 days)

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Q2 15 Sep 17 - 18, 2005