Francine H Mejia

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  September 30, 2022

  Updated classifications of flow permanence on streams in the Colville National Forest

  The Issue: Streamflow permanence refers to the probability that a stream will lose surface flow (become a dry channel), as well as the timing, duration, and frequency of drying. Patterns of streamflow permanence drive important decisions regarding forest management and other land uses. The Colville National Forest Land and Resource Management Plan (2019), for example, specifies riparian management...

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  Forest and Rangeland Ecosystem Science Center, Washington Water Science Center

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  September 30, 2022

  Updated classifications of flow permanence on streams in the Colville National Forest

  The Issue: Streamflow permanence refers to the probability that a stream will lose surface flow (become a dry channel), as well as the timing, duration, and frequency of drying. Patterns of streamflow permanence drive important decisions regarding forest management and other land uses. The Colville National Forest Land and Resource Management Plan (2019), for example, specifies riparian management...

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• Data

  If you are unable to access or download a product, email fresc_outreach@usgs.gov a request, including the full citation, or call (541) 750-1030.

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  October 31, 2022

  Distribution, frequency, and global extent of hypoxia in rivers

  To assess the distribution, frequency, and global extent of riverine hypoxia, we compiled 118 million paired dissolved oxygen (DO) and water temperature measurements from 125,158 unique locations in rivers in 93 countries and territories across the globe. The dataset also includes site characteristics derived from StreamCat, the National Hydrography and HydroAtlas datasets and proximal land cover

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  Forest and Rangeland Ecosystem Science Center

  April 25, 2022

  Fishes of the Harney Basin revisited: A contemporary assessment of the distribution of fish fauna throughout the Harney Basin from 1990 to 2019 (ver. 2.0, April 2022)

  We compiled electrofishing and habitat data sampled from 1990 to 2019 in the Harney Basin by the US Geological Survey (USGS), Oregon Department of Fish and Wildlife (ODFW) and the High Desert Partnership (HDP) to describe native and non-native fish distributions and their habitat associations. USGS collected eDNA data in 2019 to refine the known distributions of common carp (Cyprinus carpio). Site

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  Forest and Rangeland Ecosystem Science Center, Pacific Northwest Environmental DNA Laboratory

  June 29, 2021

  Airborne thermal infrared remote sensing of summer water temperature in the Middle Fork John Day River (Oregon) in 1994-2003

  This data release combines seven airborne thermal infrared (TIR) remote sensing data sets of stream temperature collected along the mainstem of the Middle Fork John Day River (MFJD) in Oregon from 1994 to 2003. Years 1994, 1995, 1996, 1998, and 2002 have single datasets. Year 2003 has two data sets. Most of the TIR data covered the upstream half of the MFJD mainstem between river km 50 and 110, wh

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  Forest and Rangeland Ecosystem Science Center

  October 19, 2020

  Water temperature data from the Priest River, Idaho, 2018-2019

  Water temperature data were collected in summer 2018 and 2019. Temperature data loggers were deployed in tributary confluences and the mainstem of the lower Priest River between Priest Lake Outlet Dam and the confluence with the Pend Oreille River. Data loggers were checked every 2 to 3 weeks throughout the summer. Data for Lagrangian longitudinal thermal profiles were obtained on August 21, 2018

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  Forest and Rangeland Ecosystem Science Center

  April 17, 2019

  Water temperature data from the Pend Oreille River, Washington and Idaho, 2016-2018

  The data were collected summer, 2016, 2017, and 2018. Continuous temperature loggers were deployed along the Pend Oreille River between Albeni Falls Dam and the Box Canyon Dam. Loggers were checked every 1-2 weeks throughout the summer.

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  Forest and Rangeland Ecosystem Science Center
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• Publications

  If you are unable to access or download a product, email fresc_outreach@usgs.gov a request, including the full citation, or call (541) 750-1030.

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  December 8, 2022

  Extent, patterns, and drivers of hypoxia in the world's streams and rivers

  Hypoxia in coastal waters and lakes is widely recognized as a detrimental environmental issue, yet we lack a comparable understanding of hypoxia in rivers. We investigated controls on hypoxia using 118 million paired observations of dissolved oxygen (DO) concentration and water temperature in over 125,000 locations in rivers from 93 countries. We found hypoxia (DO 

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  Ecosystems, Water Resources, Land Management Research Program, Forest and Rangeland Ecosystem Science Center

  March 14, 2022

  Keeping an eye on water quality from the sky

  You can learn a lot about rivers, lakes, estuaries, and oceans by looking down at them from the sky. Scientists use a technique called remote sensing to measure the amount of light or heat energy reflected and emitted from the Earth. Sensors can be on satellites or mounted on airplanes, helicopters, or drones. Scientists use this information to map the quality of water in the San Francisco Bay-Del

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  Ecosystems, Forest and Rangeland Ecosystem Science Center

  September 20, 2021

  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 (30–60 m wide). We grouped these rivers according to quartiles of

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  Ecosystems, Forest and Rangeland Ecosystem Science Center

  March 28, 2021

  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 datasets and freely-available modeling tools to apply func

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  Ecosystems, Forest and Rangeland Ecosystem Science Center, Upper Midwest Environmental Sciences Center

  April 28, 2020

  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 salmonids in a large impounded river in inland northwester

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  Ecosystems, Forest and Rangeland Ecosystem Science Center

  March 21, 2019

  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 oxygen and modeled stream metabolism for an entire yea

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  Ecosystems, Forest and Rangeland Ecosystem Science Center

  June 18, 2014

  The response of stream periphyton to Pacific salmon: using a model to understand the role of environmental context

  1. In stream ecosystems, Pacific salmon deliver subsidies of marine-derived nutrients and disturb the stream bed during spawning. The net effect of this nutrient subsidy and physical disturbance on biological communities can be hard to predict and is likely to be mediated by environmental conditions. For periphyton, empirical studies have revealed that the magnitude and direction of the response t

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  Ecosystems, Fisheries Program (unpublished), Western Fisheries Research Center, Columbia River Research Laboratory (CRRL)

  January 1, 2008

  Relation between species assemblages of fishes and water quality in salt ponds and sloughs in South San Francisco Bay

  This study was conducted to characterize fishery resources inhabiting salt-evaporation ponds and sloughs in South San Francisco Bay, and to identify key environmental variables that influence distribution of fishes. The ponds, which were originally constructed and operated for commercial production of salt, have undergone preliminary modifications (installation of culverts, gates, and other water-

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  Ecosystems, Water Resources, Fisheries Program (unpublished), California Water Science Center, Western Fisheries Research Center

  January 1, 2007

  Smallmouth bass and largemouth bass predation on juvenile Chinook salmon and other salmonids in the Lake Washington basin

  We assessed the impact of predation by smallmouth bass Micropterus dolomieu and largemouth bass M. salmoides on juveniles of federally listed Chinook salmon Oncorhynchus tshawytscha and other anadromous salmonid populations in the Lake Washington system. Bass were collected with boat electrofishing equipment in the south end of Lake Washington (February-June) and the Lake Washington Ship Canal (LW

  Non-USGS Publications**

  Mejia F.H., C.V. Baxter, E.K. Berntsen and A.K. Fremier. 2016. Linking groundwater - surface water exchange to food production and salmonid growth. Canadian Journal of Fisheries and Aquatic Sciences. 73:1650-1660.

  Mejia F.H. 2016. Understanding Variability of Stream Productivity at Different Scales and Consequences for Aquatic Food Webs. PhD Dissertation, University of Idaho, Moscow, Idaho. 135 pp.

  Sommer, T.R., and F.H. Mejia. 2013, A Place to Call Home: A Synthesis of Delta Smelt Habitat in the Upper San Francisco Estuary, San Francisco Estuary and Watershed Science 11(2), 27 p.

  Sommer, T.R., F.H. Mejia, K. Hieb, R. Baxter, E. J. Loboschefsky and F.J. Loge. 2011. Long-term shifts in the lateral distribution of age-0 striped bass Morone saxatilis in the San Francisco estuary. Transactions of the American Fisheries Society. 140: 1451-1459

  Sommer, T.R., F.H. Mejia, M.L. Nobriga, F. Feyrer; and L. Grimaldo. 2011. The Spawning Migration of Delta Smelt in the Upper San Francisco Estuary. San Francisco Estuary and Watershed Science, 9(2).

  Saiki, M.K. and F.H. Mejia. 2009. Fish-Use of the Alviso Island Ponds and Adjacent Waters in South San Francisco Bay Following the Breaching of Earthen Levees. California Fish and Game Journal (95):1-15.

  Mejia, F.H. Dominant Lake Erie Prey Fish and their Consumption of Invertebrate Prey: An Energetics Modeling Analysis. M.S. Thesis, SUNY College of Environmental Science and Forestry, December 1997.

  **Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.

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  April 30, 2020

  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...

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