Francine H Mejia
Science and Products
Integrating regional and local monitoring data and assessment tools to evaluate habitat conditions and inform river restoration
RRestoring degraded rivers requires initial assessment of the fluvial landscape to identify stressors and riverine features that can be enhanced. We associated local-scale river habitat data collected using standardized national monitoring tools with modeled regional water temperature and flow data on mid-sized northwest U.S. rivers (30–...
Mejia, Francine H.; Connor, Jason M; Kaufmann, Phil R; Torgersen, Christian E.; Berntsen, Eric K; Andersen, Todd Aquatic ecosystem metabolism as a tool in environmental management
Recent advances in high-frequency environmental sensing and statistical approaches have greatly expanded the breadth of knowledge regarding aquatic ecosystem metabolism - the measurement and interpretation of gross primary productivity (GPP) and ecosystem respiration (ER). Aquatic scientists are poised to take advantage of widely available...
Jankowski, Kathi Jo; Mejia, Francine H.; Blaszczak, Joanna; Holtgrieve, Gordon W. Longitudinal, lateral, vertical, and temporal thermal heterogeneity in a large impounded river: Implications for cold-water refuges
Dam operations can affect mixing of the water column, thereby influencing thermal heterogeneity spatially and temporally. This occurs by restricting or eliminating connectivity in longitudinal, lateral, vertical, and temporal dimensions. We examined thermal heterogeneity across space and time and identified potential cold-water refuges for...
Mejia, Francine H.; Torgersen, Christian E.; Berntsen, Eric K; Maroney, Joseph R; Connor, J M; Fullerton, Aimee H.; Ebersole, Joseph L.; Lorang, Mark L Stream metabolism increases with drainage area and peaks asynchronously across a stream network
Quantifying the spatial and temporal dynamics of stream metabolism across stream networks is key to understanding carbon cycling and stream food web ecology. To better understand intra-annual temporal patterns of gross primary production (GPP) and ecosystem respiration (ER) and their variability across space, we continuously measured dissolved...
Mejia, Francine H.; Fremier, Alexander K.; Benjamin, Joseph R.; Bellmore, J. Ryan; Grimm, Adrianne Z.; Watson, Grace A.; Newsom, Michael
Thermal Heterogeneity in a Large Impounded River: Implications for Cold-Water Refuges
Dam operations can influence spatial and temporal thermal heterogeneity in rivers, yet quantity and distribution of cold-water refuges for salmonids in large impounded rivers have not been well studied.