Luke Clifton Loken 1 Gifford Pinchot Drive, Madison, WI 53726
United States Geological Survey [email protected]
Upper Midwest Water Science Center ORCID: 0000-0003-3194-1498
EDUCATION
Ph.D., Freshwater and Marine Sciences Madison, WI
University of Wisconsin-Madison 2018
Advisor: Emily Stanley – Center for Limnology
M.S., Freshwater and Marine Sciences Madison, WI
University of Wisconsin-Madison 2014
Advisor: Emily Stanley – Center for Limnology
B.S., Biology Ann Arbor, MI
University of Michigan 2006
Academic Minor in Environment
RESEARCH EXPERIENCE
U.S. Geological Survey - Upper Midwest Water Science Center Middleton, WI
Hydrologist Jan 2020 – present
Researching the distributions and impacts of contaminants and nutrients in aquatic ecosystems.
University of California-Davis Davis, CA
Postdoctoral Scholar July 2018 – Dec 2020
Investigated the effects of nitrogen and phosphorus on food web dynamics and ecosystem metabolism of the Sacramento-San Joaquin Delta
U.S. Geological Survey – Wisconsin Water Science Center Middleton, WI
Hydrologic Research Technician Sept 2015 – Sept 2017
Researched processes controlling water, energy, and biogeochemical fluxes in Northern Wisconsin streams (WEBB)
Investigated spatially explicit nitrogen and carbon dynamics in the Mississippi and Columbia Rivers (LandCarbon)
Center for Limnology Madison, WI
Graduate Research Assistant June 2012 - July 2018
I developed a high speed sampling device to assess spatial variability in water chemistry. My research focuses on temporal and spatial patters in biogeochemical processes of lakes, rivers, and wetlands of the upper Midwest.
Olympic National Park Port Angeles, WA
Aquatic Ecologist Field Lead June 2009 – May 2012
Lead six crew members monitoring the abundance and distribution of marine and fresh water organisms throughout Olympic National Park. I analyzed physical and chemical properties of surface water, and oversaw a network of data-logging instruments.
Restoration Logistics Seattle, WA
Field Specialist June 2008 – May 2009
Implemented vegetation management plans, including restoration of wetlands, slopes, and other forest habitats for government, private, and non-profit agencies.
Washington Conservation Corps Seattle, WA
Field Crew Lead June 2007 – May 2008
Restored forest and stream habitats; and constructed and maintained hiking trails in the Central Cascades.
Haleakala National Park Kula, HI
Student Conservation Association Intern Sept 2006 – Dec 2006
Monitored native plant communities throughout Haleakala National Park while planting endemic flora to enhance native habitats, and removed invasive species.
Toolik Lake Field Station - Long Term Ecological Research Network Fairbanks, AK
Research Assistant May 2006 – Aug 2006
Monitored biogeochemistry of arctic water systems.
Cellular & Molecular Biology Ann Arbor, MI
Research Assistant and Lab Manager Oct 2003 – May 2006
Researched genes important to mouse axial patterning during development.
TEACHING EXPERIENCE
University of California – Environmental Science and Policy Davis, CA
Co-Instructor - Principles and practices of estimating ecosystem metabolic rates (ECL 290) Winter 2019
University of Wisconsin – Zoology Madison, WI
Guest Lecturer - Spatial analysis and GIS in R (Zoo 955) Spring 2018
Graduate Student Instructor (Lead) - Limnology Laboratory (Zoo 316) Fall 2014
Graduate Student Instructor - Limnology Laboratory (Zoo 316) Fall 2013
Graduate Student Instructor - Introductory to Animal Biology Laboratory (Bio 102) Fall 2012
MENTORING & SUPERVISING
Undergraduate Students:
Heidi Agnew (2022-2023)
Owen Sowerwine (2019)
Reed Tran (2019)
Lindsay Vaughan (2019)
Isabella Glenn (2018-2019)
Christopher Dunbar (2018-2019)
Quinn Gavin (2017-2018)
Angela Baldocchi (2017-2018)
Paul Schramm (2014-2016)
Nicholas Gubbins (2014-2016)
Patrick Dowd (2015)
Ryan Hassemer (2012-2014)
OUTREACH & SERVICE EXPERIENCE
Winter and Summer Limnology Lead Instructor 2013 – 2018
President of the CFL’s Limnology and Fisheries Society 2012 – 2013
Lussier Community Education Center - Database Development Volunteer 2012 – present
YMCA of Greater Seattle - Teen Programs Volunteer 2008 – 2012
Mountains to Sound Greenway Volunteer Event Leader 2007 – 2008
GRANTS & FELLOWSHIPS
U.S. Army Corps of Engineers (234G0804MR) - $285,430 (2023-2025)
Great Lakes Restoration Initiative Focus Area 1.3 - $241,600 (2022)
Next Generation Water Observing System (NGWOS) Illinois River - $344,000 (2022-2024)
U.S. Bureau of Reclamation (R21AC10519) - $394,729 (2021)
US. Agency for International Development sub-agreement with University of Nevada-Reno - $92,000 (2021)
U.S. Bureau of Reclamation (R20PG00028) - $28,851 (2020)
Dorothy Powers Grant and Eugene Lodewick Grant Memorial Scholarship Fund Fellowship - $5,484 (2016)
AWARDS
Star Award - Upper Midwest Water Science Center - $1,500 (2023)
USGS Early Career Scientist of the Year Nominee (2022)
Star Award - Upper Midwest Water Science Center - multiple awards totaling $2,000 (2022)
ASLO Student Travel Award - $606 (2018)
AGU Fall Meeting Outstanding Student Presentation Award, Biogeosciences (2017)
Student Research Travel Grants - multiple awards totaling $2400 (2016-2017)
John Jefferson Davis Travel Award - multiple awards totaling $4100 (2013-2017)
Anna Grant Birge Grant - multiple awards totaling $8,090 (2013-2017)
Charlotte Stein Travel Award - $500 (2014)
LMS Chancellor’s Opportunity Award - $2,000 (2012)
Star Award – Olympic National Park - $1500 (2010)
PUBLICATIONS
Rocher-Ros G, Stanley EH, Loken LC, Casson NJ, Raymond PA, Liu S, Amatulli G, Sponseller R (2023) Global methane emissions from running waters. Nature 621: 530–535, https://doi.org/10.1038/s41586-023-06344-6
Stanley EH, Loken LC, Casson NJ, Oliver SK, Sponseller RA, Wallin MB, Zhang L, Rocher-Ros G (2023) GRiMeDB: The global river database of methane concentrations and fluxes. Earth System Science Data, https://doi.org/10.5194/essd-2022-346
Horwatich JA, Fermanich K, Pronschinske MA, Robertson DM, Kussow S, Loken LC, Reneau PC, Freund J, Komiskey MJ (2023) Assessment of conservation management practices on water quality and observed trends in the Plum Creek Basin, 2010–20: U.S. Geological Survey Scientific Investigations Report 2023–5043, 31 p., https://doi.org/10.3133/sir20235043
Smits AP, Loken LC, Van Nieuwenhuyse EE, Young MJ, Stumpner PR, Lenoch LEK, Burau JR, Dahlgren RA, Brown T, Sadro S (2023) Hydrodynamics structure plankton communities and interactions in a freshwater tidal estuary. Ecological Monographs 93(2): e1567, https://doi.org/10.1002/ecm.1567
Loken LC, Corsi SR, Alvarez DA, Ankley GT, Baldwin AK, Blackwell BR, DeCicco LA, Nott MA, Oliver SK, Villeneuve DL (2023) Prioritizing Pesticides of Potential Concern and Identifying Potential Mixture Effects in Great Lakes Tributaries Using Passive Samplers. Environmental Toxicology and Chemistry 42: 340-366, https://doi.org/10.1002/etc.5491
Oliver SK, Corsi SR, Baldwin A, Nott M, Ankley GT, Blackwell BR, Villeneuve DL, Hladik ML, Kolpin DW, Loken LC, DeCicco LA, Meyer MT, Loftin KA 2022. Pesticide prioritization by potential biological effects in tributaries of the Laurentian Great Lakes. Environmental Toxicology and Chemistry 42: 367-384, https://doi.org/10.1002/etc.5522
Loken LC, Sadro S, Lenoch LEK, Stumpner PR, Dahlgren RA, Burau JR, Van Nieuwenhuyse EE (2022) Whole-ecosystem experiment illustrates short timescale hydrodynamic, light, and nutrient control of primary production in a terminal slough. Estuaries and Coasts 45: 2428-2449, https://doi.org/10.1007/s12237-022-01111-8
Fermanich K, Meyers M, Loken LC, Bischoff-Gray M, Turco R, Stahlheber K, Duriancik L, Dornbush M, Komiskey M (2023) Challenges in linking soil health to edge-of-field water quality across the Great Lakes basin. Journal of Environmental Quality, 52: 508-522, https://doi.org/10.1002/jeq2.20364
Baldwin AK, Corsi SR, Stefaniak OM, Loken LC, Villeneuve DL, Ankley GT, Blackwell BR, Lenaker PL, Nott MA, Mills MA (2022) Risk-based prioritization of organic chemicals and locations of ecological concern in sediment from Great Lakes tributaries. Environmental Toxicology and Chemistry, 41: 1016-1041, https://doi.org/10.1002/etc.5286
Lenoch LEK, Stumpner PR, Burau JR, Loken LC, Sadro S (2021) Dispersion and stratification dynamics in the Upper Sacramento Deep Water Ship Channel. San Francisco Estuary and Watershed Science, 19(4): 1-29, https://doi.org/10.15447/sfews.2021v19iss4art5
Loken LC, Van Nieuwenhuyse EE, Dahlgren RA, Lenoch LEK, Stumpner PR, Burau JR, Sadro S (2021) Assessment of multiple ecosystem metabolism methods in an estuary. Limnology and Oceanography: Methods, 19: 741–757, https://doi.org/10.1002/lom3.10458
Smits AP, Currinder B, Framsted N, Loken LC, Lucero D, Neal KA, Parisek CA, Sickman J, Sadro S (2021) Watershed and lake attributes dictate landscape patterns of resource flows in mountain lakes. Water Resources Research 57, e2020WR027673, https://doi.org/10.1029/2020WR027673
Baldocchi, AK, Reed DE, Loken LC, Stanley EH, Huerd H, Desai AR (2020) Comparing spatial and temporal variation of lake‐atmosphere carbon dioxide fluxes using multiple methods. Journal of Geophysical Research: Biogeosciences 125, e2019JG005623, https://doi.org/10.1029/2019JG005623
Loken LC, Crawford JT, Scharmm PH, Stadler P, Stanley EH (2019) Large spatial and temporal variability of carbon dioxide and methane in a eutrophic lake. Journal of Geophysical Research – Biogeosciences 124: 2248–2266, https://doi.org/10.1029/2019JG005186
Kuhn C, de Matos Valerio A, Ward, N, Loken L, Sawakuchi H, Kampel M, Richey J, Stadler P, Crawford J, Striegl R, Vermote E, Pahlevan N, Butman D (2019) Performance of Landsat-8 and Sentinel-2 surface reflectance products for river remote sensing retrievals of chlorophyll-a and turbidity. Remote Sensing of the Environment 224:104–118, https://doi.org/10.1016/j.rse.2019.01.023
Stadler P, Loken LC, Crawford J, Schramm P, Sorsa K, Kuhn C, Savio D, Striegl R, Butman D, Stanley E, Farnleitner AH, Zessner M (2019) Spatial patterns of enzymatic activity in large water bodies: Ship-borne measurements of beta-D-glucuronidase activity as a rapid indicator of microbial water quality. Science of the Total Environment 651:1742–1752, https://doi.org/10.1016/j.scitotenv.2018.10.084
Loken LC, Crawford JT, Dornblaser M, Houser J, Striegl RG, Stanley EH (2018) Minimal nitrate removal in the Upper Mississippi River. Environmental Research Letters 13:074030, https://doi.org/10.1088/1748-9326/aacd51
Crawford JT, Butman DE, Loken LC, Stadler P, Kuhn C, Striegl RG (2017) Spatial variability of CO2 concentrations and biogeochemistry in the Lower Columbia River. Inland Waters 7(4):417–427, https://doi.org/10.1080/20442041.2017.1366487
Butitta VB, Carpenter SR, Loken LC, Pace ML, Stanley EH (2017) Spatial early warming indicators in a lake manipulation. Ecosphere 8(10):e01941, https://doi.org/10.1002/ecs2.1941
Crawford JT, Loken LC, West WE, Crary B, Spawn SA, Gubbins N, Jones SE, Striegl RG, Stanley EH (2017) Spatial heterogeneity of within-stream methane concentrations. Journal of Geophysical Research - Biogeosciences 122:1036–1048, https://doi.org/10.1002/2016JG003698
Turner PA, Griffis TJ, Baker JM, Lee X, Crawford JT, Loken LC, Venterea RT (2016) Regional-scale controls on dissolved nitrous oxide in the Upper Mississippi River. Geophysical Research Letters, 43:4400–4407, https://doi.org/10.1002/2016GL068710
Crawford JT, Loken LC, Stanley EH, Stets EG, Dornblaser MM, Striegl RG (2016) Basin scale controls on CO2 and CH4 emissions from the Upper Mississippi River. Geophysical Research Letters, 43:1973–1979, https://doi.org/10.1002/2015GL067599
Stanley EH, Casson NJ, Christel ST, Crawford JT, Loken LC, Oliver SK (2016) The ecology of methane in streams and rivers: patterns, controls, and global significance. Ecological Monographs 86(2):146–171, https://doi.org/10.1890/15-1027
Loken LC, Oliver SK (2016) Habitat requirements and occurrence of Crematogaster pilosa (Hymenoptera: Formicidae) ants within intertidal salt marshes. The Florida Entomologist 99(1):82–88, https://doi.org/10.1653/024.099.0115
Loken LC, Finlay, JC, Small GE, Sterner RW, and Stanley EH (2016) Nitrogen cycling in a freshwater estuary. Biogeochemistry 12(2):199–216, https://doi.org/10.1007/s10533-015-0175-3
Crawford JT, Loken LC, Casson NJ, Smith C, Stone AG, and Winslow LA (2015) High-speed limnology: Using advanced sensors to investigate spatial variability in biogeochemistry and hydrology. Environmental Science and Technology 49:442–450, https://doi.org/10.1021/es504773x
Crawford JT, Stanley EH, Spawn SA, Finlay JC, Loken LC, Striegl RG (2014) Ebullitive methane emissions from oxygenated wetland streams. Global Change Biology 20:3408–3422, https://doi.org/10.1111/gcb.12614
McIntyre DC, Rakshit S, Yallowitz AR, Loken LC, Jeannotte L, Capecchi MR, Wellik DM (2007) Hox patterning of the vertebrate rib cage. Development 134:2981–2989, https://doi.org/10.1242/dev.007567
DATA AND SOFTWARE
Loken LC, Diebel MW, Bonville DB, Robertson DM, Koltun GF, Bertke EE, Kula SP, Komiskey MJ, (2023) Phosphorus, nitrogen, and suspended-sediment loads measured at the Great Lakes Restoration Initiative tributary monitoring network: Water years 2011-2020: U.S. Geological Survey data release, https://doi.org/10.5066/P986B6HQ.
Pronschinske MA, Loken LC, Corsi SR, Alvarez DA (2023) Per- and polyfluoroalkyl substances (PFAS) and pharmaceutical compound data from passive and sediment samples from 62 Great Lakes tributary sites collected in 2018: U.S. Geological Survey data release, https://doi.org/10.5066/P9QKDUCH.
Pronschinske MA, Horwatich JA, Loken LC, Komiskey MJ (2023) Water Quality and Estimated Changes in the Plum Creek Watershed 2010-2020 (Data Release and Model Archive): U.S. Geological Survey data release, https://doi.org/10.5066/P92A0H98.
Stanley EH, Loken LC, Casson NJ, Oliver SK, Sponseller RA, Wallin MB, Zhang L, Rocher-Ros F (2022) GRiMeDB: a comprehensive global database of methane concentrations and fluxes in fluvial ecosystems with supporting physical and chemical information ver 1. Environmental Data Initiative. https://doi.org/10.6073/pasta/b7d1fba4f9a3e365c9861ac3b58b4a90.
Loken LC, DeCicco LA, Corsi SR, Oliver SK, Blackwell BR, Ankley GT, Villenuve DL (2021) ToxMixtures: A package to explore toxicity due to chemical mixtures. https://doi.org/10.5066/P9BX71PG.
Loken LC, Alvarez DA, Baldwin AK, Corsi SR (2022) Pesticides and pesticide transformation product data from passive samplers deployed in 15 Great Lakes tributaries, 2016: U.S. Geological Survey data release, https://doi.org/10.5066/P9QOMM22.
Meyers ME, Loken LC, Fermanich KJ, Dornbush ME, Bischoff Gray M, Turco RF, Komiskey MJ (2021) Soil physical, chemical, and biological data from edge-of-field agricultural water quality monitoring sites in Great Lakes States: U.S. Geological Survey data release, https://doi.org/10.5066/P99ETDL5.
Lenoch LEK, Loken LC, Stumpner PR, Sadro S, Van Nieuwenhuyse EE, Burau JR, Dahlgren RA, Beaver J (2021) Nutrient Addition Experiment in the Sacramento River Deep Water Ship Channel: U.S. Geological Survey data release. https://doi.org/10.5066/P9SKCIUW.
Komiskey MJ, Stuntebeck TD, Loken LC, Hood KA, Danz ME, Rachol CM, Toussant CA, Dobrowolski EG, Kowalczk AJ, Ennis RP, Snarski SA, Hardebeck MJ (2021) Nutrient and sediment concentrations, loads, yields, and rainfall characteristics at USGS surface and subsurface-tile edge-of-field agricultural monitoring sites in Great Lakes States: U.S. Geological Survey data release, https://doi.org/10.5066/P9LO8O70.
Loken L, Stanley E, Schramm P, Gahler M (2019) Spatial surface water chemistry of Lake Mendota with FLAMe: 2014-2016. Environmental Data Initiative. https://doi.org/10.6073/pasta/fe9c5437f67254f521bf5f7e0308bf93.
Loken L, Crawford J, Stanley E, Butman D, Striegl R (2018). Columbia River spatial water chemistry. Environmental Data Initiative. https://doi.org/10.6073/pasta/e881070c9e8f6b7f774d3c65b27a9f69.
Loken L, Crawford JT, Stanley EH (2018) Mississippi River spatial water chemistry Environmental Research Letters datasets. Environmental Data Initiative. https://doi.org/10.6073/pasta/c1b9dbd9a96edfb5e39a94cfef2982b9.
Butitta VB, Carpenter SR, Loken LC, Pace ML, Stanley EH (2017) Cascade project at North Temperate Lakes LTER - High-resolution spatial analysis of CASCADE lakes during experimental nutrient enrichment 2015 - 2016. Environmental Data Initiative. http://dx.doi.org/10.6073/pasta/403cc21eba48b801114801ea05c5c2fa.
Loken LC, Crawford JT, Stanley EH (2017) Spatial variability in water chemistry of four Wisconsin aquatic ecosystems - High speed limnology Environmental Science and Technology datasets. Environmental Data Initiative. http://dx.doi.org/10.6073/pasta/a736ade04c0faf57868c38fa3dba5abb.
Loken L, Small G, Finlay J, Sterner R, Runde E, Brovold S, Stanley E (2016) Saint Louis River Estuary water chemistry, Wisconsin, Minnesota, USA 2012 - 2013. Long Term Ecological Research Network. http://dx.doi.org/10.6073/pasta/08fdc0fb8528e37dd7ef6d6ad2b77f99.
Stanley EH, Loken LC, Crawford JT, Casson NJ, Oliver SK, Gries C, Christel ST (2015) A Global database of methane concentrations and atmospheric fluxes for streams and rivers. Long Term Ecological Research Network. http://dx.doi.org/10.6073/pasta/21f5bd6642e9689baf90262f3c85ac4a.
ORAL PRESENTATIONS
Association for the Sciences of Limnology and Oceanography Summer Meeting - Palma, Spain Jun 7, 2023
International Association for Great Lakes Research Annual Meeting, Toronto, ON, Canada May 10, 2023
Joint Aquatic Sciences Meeting - Grand Rapids, MI May 20, 2022
Society of Environmental Toxicology and Chemistry, Portland, OR (virtual, panelist) Nov 17, 2021
Ecological Society of America - Long Beach, CA Aug 2, 2021
National Water Monitoring Conference - Virtual (panelist) Apr 23, 2021
Bay Delta Science Conference - Virtual Apr 8, 2021
Interagency Ecological Program Annual Workshop - Folsom, CA (invited) Mar 5, 2019
American Geophysical Union Fall Meeting - Washington D.C. Dec 10, 2018
Bay Delta Science Conference - Sacramento, CA Sep 12, 2018
Association for the Sciences of Limnology and Oceanography Summer Meeting - Victoria, BC Jun 12, 2018
European Geosciences Union General Assembly - Vienna, Austria Apr 24, 2017
Association for the Sciences of Limnology and Oceanography Summer Meeting - Santa Fe, NM Jun 8, 2016
Society of Freshwater Sciences Meeting - Milwaukee, WI May 19, 2015
Science in the Northwoods Meeting - Boulder Junction, WI Oct 16, 2014
Joint Aquatic Sciences Meeting - Portland, OR May 19, 2014
Ecological Society of America - Minneapolis, MN Aug 9, 2013
Saint Louis River Estuary Science Summit - Superior, WI Feb 26, 2013
POSTER PRESENTATIONS
Society of Environmental Toxicology and Chemistry, Portland, OR (virtual) Nov 17, 2021
American Geophysical Union Fall Meeting, San Francisco, CA Dec 12, 2019
American Geophysical Union Fall Meeting, Washington D.C. (invited) Dec 10, 2018
American Geophysical Union Fall Meeting, New Orleans, LA Dec 13, 2017
Long Term Ecological Research All Sciences Meeting, Estes Park, CO Sep 1, 2015
American Geophysical Union Fall Meeting, San Francisco, CA Dec 18, 2014
WORKSHOPS, TRAININGS, & SPECIAL SESSIONS ORGANIZED
Workshop at Association for the Sciences of Limnology and Oceanography Meeting, Palma, Spain Jun 4, 2023
Graduate training workshop on mapping water quality across Tonle Sap, Phnom Penh, Cambodia Oct 11, 2022
Edge of field soil health webinar, Virtual Apr 27, 2021
Special session at Bay Delta Science Conference, Virtual Apr 8, 2021
Special session at American Geophysical Union Annual Meeting, San Francisco, CA Dec 13, 2017
Human Aquatic Linkages of Southeast Asia Proposal Workshop, Madison, WI Jul 18-19, 2017
PROFESSIONAL SERVICE
Ad-hoc Reviewer:
Aquatic Sciences
Biogeochemistry
Biogeosciences
Ecosystems
Environmental Research Letters
Environmental Science & Technology
Global Biogeochemical Cycles
Global Change Biology
Hydrological Processes
Journal of Geophysical Research - Biogeosciences
Limnology and Oceanography
Limnology and Oceanography Letters
Limnology and Oceanography Methods
Nature Geosciences
United States Environmental Protection Agency
United States Geological Survey
Water Research
Water Resources Research
PROFESSIONAL AFFILIATIONS
The Long-Term Ecological Research Network (LTER)
American Geophysical Union (AGU)
Association for the Sciences of Limnology and Oceanography (ASLO)
Society of Freshwater Sciences (SFS)
RELEVANT SKILLS
Proficiency in Microsoft Excel and Access, ArcGIS, and the statistical programming language R
Experience with deployment and maintenance of in-situ sensors in marine and freshwater systems (Hobo, YSI, Hydrolab, Satlantic, Turner, Manta, Los Gatos Research)
Experience with wet chemical, spectroscopic, and fluorometric analytical methods used in water quality monitoring
Experience operating boats during research and teaching cruises (MOCC certified)
Certified open water diver
Wilderness first aid & CPR