gov.noaa.nmfs.inport:20550 eng UTF8 dataset Spreadsheet Northwest Fisheries Science Center 206-860-3200 2725 Montlake Boulevard East Seattle WA 98112 USA https://www.nwfsc.noaa.gov WWW:LINK-1.0-http--link Website Website for this organization information resourceProvider Liermann, Martin 206-860-6781 2725 Montlake Boulevard East Seattle WA 98112 Martin.Liermann@noaa.gov pointOfContact 2026-03-04T19:17:17 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) Master Dataset for Elwha Carcass Addition Experiment - Elwha River salmon carcass addition experiment Biota (Elwha River salmon carcass addition experiment) 2007-08-15 creation 2018-10-01 publication NOAA/NMFS/EDM 20550 https://www.fisheries.noaa.gov/inport/item/20550 WWW:LINK-1.0-http--link Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information Morley, Sarah 206-860-6780 2725 Montlake Boulevard East Seattle WA 98112 Sarah.Morley@noaa.gov originator https://www.webapps.nwfsc.noaa.gov/apex/parrdata/inventory/datasets/dataset/2045 WWW:LINK-1.0-http--link Master Dataset for Elwha Carcass Addition Experiment NWFSC Dataset Information page. All datasets related to Elwha River carcass addition experiment. Includes physical habitat, chemical, and biological data. download tableDigital Dam removal and other fish-barrier removal projects in western North America are assumed to boost freshwater productivity via the transport of marine-derived nutrients from recolonizing Pacific salmon (Oncorhynchus spp). In anticipation of the removal of two hydroelectric dams on the Elwha River in Washington State, we tested this hypothesis with a salmon carcass addition experiment. Our study was designed to examine how background nutrient dynamics and benthic foodwebs vary seasonally, and how these features respond to salmon subsidies. We conducted our experiment in six side channels of the Elwha River, each with a spatially paired reference and treatment reach. Each reach was sampled on multiple occasions from October 2007 to August 2008, before and after carcass placement. We evaluated nutrient limitation status, measured water chemistry, periphyton, benthic invertebrates, and juvenile rainbow trout (O. mykiss) response, and traced salmon-derived nutrient uptake using stable isotopes. Outside of winter, algal accrual was limited by both nitrogen and phosphorous and remained so even in the presence of salmon carcasses. One month after salmon addition, dissolved inorganic nitrogen levels doubled in treatment reaches. Two months after addition, benthic algal accrual was significantly elevated. We detected no changes in invertebrate or fish metrics, with the exception of 15N enrichment. Natural seasonal variability was greater than salmon effects for the majority of our response metrics. Yet seasonality and synchronicity of nutrient supply and demand are often overlooked in nutrient enhancement studies. Timing and magnitude of salmon-derived nitrogen uptake suggest that uptake of dissolved nutrients were favored over direct consumption of carcasses. The highest proportion of salmon-derived nitrogen was incorporated by herbivores (18–30%) and peaked 1–2 months after carcass addition. Peak nitrogen enrichment in predators (11–16%) occurred 2–3 months after addition. All taxa returned to background d15N levels by 7 months. Since this study was conducted, both dams on the Elwha River were removed over 2011-2014 to open over 90% of the basin to anadromous fishes. We anticipate that as the full portfolio of salmon species expand through the basin, nutrient supply and demand will become more balanced and positive feedback loops of reciprocal nutrient transfer reinforced. All datasets related to Elwha River carcass addition experiment. Includes physical habitat, chemical, and biological data. Raw/field data, Laboratory data completed Liermann, Martin 206-860-6781 2725 Montlake Boulevard East Seattle WA 98112 Martin.Liermann@noaa.gov pointOfContact Liermann, Martin 206-860-6781 2725 Montlake Boulevard East Seattle WA 98112 Martin.Liermann@noaa.gov custodian Elwha River aquatic invertebrate dam removal effectiveness monitoring floodplain food web habitat marine derived nutrients nutrient enrichment periphyton salmon side channel stable isotopes theme Instrument Not Applicable instrument Animal and Plant Collection Device Bottom Sampler platform DOC/NOAA/NMFS/NWFSC > Northwest Fisheries Science Center, National Marine Fisheries Service, NOAA. U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2017-04-24 publication 8.5 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian FE Legacy Data Sets project InPort otherRestrictions Cite As: Northwest Fisheries Science Center, [Date of Access]: Master Dataset for Elwha Carcass Addition Experiment - Elwha River salmon carcass addition experiment [Data Date Range], https://www.fisheries.noaa.gov/inport/item/20550. NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose. otherRestrictions Access Constraints: NA unclassified NOAA Data Management Plan (DMP) NOAA/NMFS/EDM 20550 https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/nwfsc/dmp/pdf/20550.pdf WWW:LINK-1.0-http--link NOAA Data Management Plan (DMP) NOAA Data Management Plan for this record on InPort. information crossReference eng; US oceans Spreadsheet -123.7579 -123.3293 47.6658 48.1502 Elwha River: Lower and middle Elwha River basin 2007-08-01 2008-08-30 Subject to Public Access to Research Results (PARR): Yes Presentation: Transfer of marine-derived salmon nutrients to freshwater food webs: predicted response of primary and secondary producers to dam removal on the Elwha River (Washington state), USA. Talk given at the 5th World Fisheries Congress, Yokohoma, Japan Presentation: Effects of salmon carcasses on riverine food webs in experimental field study on the Elwha River. Talk given at 81st Annual Meeting of the Northwest Scientific Association, Seattle, WA false eng false Spreadsheet Elwha Carcass Addition 2018-10-01 publication Northwest Fisheries Science Center 206-860-3200 2725 Montlake Boulevard East Seattle WA 98112 USA nmfs.nwfsc.metadata@noaa.gov https://www.nwfsc.noaa.gov WWW:LINK-1.0-http--link NWFSC Home Website listed for Northwest Fisheries Science Center information distributor https://www.webapps.nwfsc.noaa.gov/apex/parrdata/inventory/tables/table/elwha_carcass_addition WWW:LINK-1.0-http--link Elwha Carcass Addition Master table of all datasets collected as part of Elwha River carcass addition experiment. download https://www.webapps.nwfsc.noaa.gov/apex/parr/elwha_carcass_addition/data/page/ WWW:LINK-1.0-http--link Elwha Carcass Addition (RESTful) Master table of all datasets collected as part of Elwha River carcass addition experiment. download dataset Accuracy Medium Invertebrates identified and enumerated under microscopy, chlorophyll samples analyzed by fluormeter, isotope samples analyzed in mass spec