Characterization of organic matter along a mountain to urban gradient of land useMost organic matter in lotic ecosystems is presumed to be from terrestrial sources such as leaf litter and soil leachates. With increased urbanization and land use change we predict that autochthonous sources of organic matter may compose a greater proportion of organic matter due to increased frequency and duration of algal blooms.
To characterize potential sources of organic matter I used stable isotopes from multiple size classes of organic matter and fluorescent properties of dissolved organic matter. FPOM and CPOM isotope results can be found in our paper about the Jordan River in Salt Lake City, Utah. I also am incorporating data from the iUTAH sampling stations. Data from sampling stations on the Logan and Provo Rivers, as well as Red Butte Creek can be accessed on Hydroshare. Carbon, nitrogen and deuterium
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Microbial consumption of freshwater dissolved organic matter in response to labile organic matterI conducted an experiment at the Cary Institute of Ecosystem Studies at the Experimental Stream Facility with collaborator, Emma Rosi. We used experimental stream mesocosms to see if semi-labile organic matter, such as soil leachate, degraded faster when labile organic matter, such as algal leachate, was mixed in experimental streams and bottle bioassays. The objective of this study was to determine if factors such as light, benthic biomass, and the source of labile organic matter influence the consumption and degradation of dissolved organic matter (DOM) in rivers.
Perennial versus intermittent stream macroinvertebrate
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kelso_and_entrekin_2018.pdf |