Reports & Publications

Faculty: Todd V. Royer
Selected Works:

• “Time to amend the US Clean Water Act,” Science, 372 (6548) 1272 (2021)
• “The case for studying highly modified agricultural streams: farming for biogeochemical insights,” (with J.L. Tank, S.L. Speir, and L.R. Sethna), Limnology and Oceanography Bulletin, May: 41-47 (2021)
• “Stoichiometry of nitrogen, phosphorus, and silica loads in the Mississippi-Atchafalaya River basin reveals spatial and temporal patterns in risk for cyanobacterial blooms,” Limnology and Oceanography, 65: 325-335 (2020)
• “Human-dominated rivers and river management in the Anthropocene,” Stream Ecosystems in a Changing Environment (ed. J. Jones and E. Stanley), Academic Press, (2016)
• Persistent, Bioaccumulative, and Toxic (PBT) Chemicals: Technical Aspects, Policies, and Practices, (with A.D.K. Abelkop and J.D. Graham) CRC Press, Boca Raton, Florida (2015)
• "Dissolved organic carbon manipulation reveals coupled cycling of carbon, nitrogen and phosphorus in a nitrogen-rich stream," (with L.T. Johnson and D. Oviedo-Vargas), Limnology and Oceanography, 58(4): 1196-1206 (2013)
• "Manipulation of the dissolved organic carbon pool in an agricultural stream: responses in microbial community structure, denitrification, and assimilatory nitrogen uptake," (with J.M. Edgerton, L.T. Johnson, and L.G. Leff), Ecosystems, 15: 1027-1038 (2012)
• "Pharmaceutical compounds and ecosystem function: an emerging research challenge for aquatic ecologists," (with E. J. Rosi-Marshall), Ecosystems, 15: 867-880 (2012)
• "Timing of riverine export of nitrate and phosphorus from agricultural watersheds in Illinois: implications for reducing nutrient loading to the Mississippi River," (with M. B. David and L. E. Gentry), Environmental Science & Technology, 40: 4126–4131 (2006)

Reports and Publications:

• Cohle, Z., Ortega, A., Tank, J. L., Royer, T. V., Mahl, U. H., Speir, S. L., Trentman, M. T., & Gessner, M. O. (2022). Effects of climate and winter cover crops on nutrient loss in agricultural watersheds in the midwestern U.S. Climatic Change, 177, 9
• Ward, A. S., Packman, A. I., Bernal, S., Brekenfeld, N., Drummond, J., Graham, E. B., Hannah, D. M., Klaar, M., Kurz, M., Li, A., Lupon, A., Mao, F., Martí Roca, M. E., Ouellet, V., Zarnetske, J. P., … Royer, T. V. (2022). Advancing river corridor science beyond disciplinary boundaries with an inductive approach to catalyze hypothesis generation. Hydrological Processes, 36(4), e14540
• Costello, D. M., Tiegs, S. D., Boyero, L., Canhoto, C., Capps, K. A., Danger, M., Frost, P. C., Gessner, M. O., Griffiths, N. A., Halvorson, H. M., Kuehn, K. A., Marcarelli, A. M., Royer, T. V., Mathie, D. M., … Zwart, J. A. (2022). Global patterns and controls of nutrient immobilization on decomposing cellulose in riverine ecosystems. Global Biogeochemical Cycles, 36(3), e2021GB007163
• Sethna, L. R., Royer, T. V., Speir, S. L., Trentman, M. T., Mahl, U. H., Hagemeier, L. P., & Tank, J. L. (2022). Silicon concentrations and stoichiometry in two agricultural watersheds: implications for management and downstream water quality. Biogeochemistry, 159(2), 265-282

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71. Speir, S.L., J.L. Tank, M.T. Trentman, U.H. Mahl, L.R. Sethna, and T.V. Royer. 2022. Cover crops control nitrogen and phosphorus transport from two agricultural watersheds at multiple measurement scales. Agriculture, Ecosystems & Environment 326:107765, https://doi.org/10.1016/j.agee.2021.107765.
72. Speir, S.L., J.L. Tank, M. Bieroza, U.H. Mahl, and T.V. Royer. 2021. Storm size and hydrologic modification influence nitrate mobilization and transport in agricultural watersheds. Biogeochemistry 156:319-334.

 

69. Royer, T.V. 2021. Time to amend the US Clean Water Act. Science 372:1272, 10.1126/science.abj3438

 

68. Hanrahan, B.R., J.L. Tank, S.L. Speir, M.T. Trentman, S.F. Christopher, U.H. Mahl, and T.V. Royer. 2021. Extending vegetative cover with cover crops influenced phosphorus loss from an agricultural watershed. Science of the Total Environment 801:149501, https://doi.org/10.1016/j.scitotenv.2021.149501

 

67. Tank, J.L., S.L. Speir, L.R. Sethna, and T.V. Royer. 2021. The case for studying highly modified agricultural streams: farming for biogeochemical insights. Limnology and Oceanography Bulletin May 2021:41–47.

 

66. Christopher, S.F., J.L. Tank, U.H. Mahl, B.R. Hanrahan, and T.V. Royer. 2021. Effect of winter cover crops on soil nutrients in two row-cropped watersheds in Indiana. Journal of Environmental Quality 50:667–679.

 

65. Trentman, M.T., J.L. Tank, T.V. Royer, S.L. Speir, U.H. Mahl, and L.R. Sethna. 2020. The role of cover crops and antecedent precipitation on soluble reactive phosphorus losses via tile drain flow in an agricultural watershed. Hydrological Processes 34:4446–4458.

 

64. Trentman, M., J.L. Tank, S.E. Jones, S.K. McMillan, and T.V. Royer. 2020. Seasonal evaluation of biotic and abiotic factors suggests phosphorus retention in constructed floodplains in three agricultural streams. Science of the Total Environment 729: 138744, https://doi.org/10.1016/j.scitotenv.2020.138744.

 

63. Burns, S.E., J.A. Morgan, J.R. White, and T.V. Royer. 2020. Macroinvertebrate response to fine sediment removal and streambed restoration in a low gradient river in Indiana, USA. Proceedings of the Indiana Academy of Sciences 128:170–186.

 

62. Royer, T.V. 2020. Stoichiometry of nitrogen, phosphorus, and silica loads in the Mississippi-Atchafalaya River basin reveals spatial and temporal patterns in risk for cyanobacterial blooms. Limnology and Oceanography 65:325–335.

 

61. Ward, A.S., S.M. Wondzell, N.M. Schmadel, S. Herzog, J.P Zarnetske, V. Baranov, P.J. Blaen, N. Brekenfeld, R. Chu, R. Derelle, J. Drummond, J.H. Fleckenstein, V. Garayburu-Caruso, E. Graham, D. Hannah, C.J. Harman, J. Hixson, J.L.A. Knapp, S. Krause, M.J. Kurz, J. Lewandowski, A. Li, E. Martí, M. Miller, A.M. Milner, K. Neil, L. Orsini, A.I. Packman, S. Plont, L. Renteria, K. Roche, T. Royer, C. Segura, J. Stegen, J. Toyoda, J. Wells, N.I. Wisnoski. 2019. Spatial and temporal variation in river corridor exchange across a 5th order mountain stream network. Hydrology and Earth System Sciences

23:5199–5225.

 

60. Ward, A.S., J.P Zarnetske, V. Baranov, P.J. Blaen, N. Brekenfeld, R. Chu, R. Derelle, J. Drummond, J.H. Fleckenstein, V. Garayburu-Caruso, E. Graham, D. Hannah, C.J. Harman, S. Herzog, J. Hixson, J.L.A. Knapp, S. Krause, M.J. Kurz, J. Lewandowski, A. Li, E. Martí, M. Miller, A.M. Milner, K. Neil, L. Orsini, A.I. Packman, S. Plont, L. Renteria, K. Roche, T. Royer, N.M. Schmadel, C. Segura, J. Stegen, J. Toyoda, J. Wells, N.I. Wisnoski, and S.M. Wondzell. 2019. Co-located contemporaneous mapping of morphological, hydrological, chemical, and biological conditions in a 5^th-order mountain stream network, Oregon, USA. Earth Systems Science Data 11:1567–1581.

 

59. Morgan, J.A., T.V. Royer, and J.R. White. 2019. Fine sediment removal influences biogeochemical processes in a gravel-bottomed stream. Environmental Management 64:258–271.

 

58. McLaren, J.S., T.V. Royer, R. Van Kirk, and M.A. Muradian. 2019. Management and limnology interact to drive water temperature patterns in a middle Rockies river-reservoir system. Journal of the American Water Resources Association 55:1323–1334.

 

57. Smits A.P., C.M. Ruffing, T.V. Royer, A.P. Appling, N.A. Griffiths, R. Bellmore, M.D. Scheuerell, T.K. Harms, and J.B. Jones. 2019. Detecting signals of large-scale climate phenomena in discharge and nutrient loads in the Mississippi-Atchafalaya River basin. Geophysical Research Letters 46:3791–3801. https://doi.org/10.1029/2018GL081166

 

56. Tiegs, S.D. et al. (152 authors in total). 2019. Global patterns and drivers of ecosystem functioning in rivers and riparian zones. Science Advances 5(1): eaav0486 DOI: 10.1126/sciadv.aav0486

 

55. Hanrahan, B.R., J.L. Tank, S.F. Christopher, U.H. Mahl, M.T. Trentman, and T.V. Royer. 2018. Winter cover crops reduce nitrate loss from an agricultural watershed in the central U.S. Agriculture, Ecosystems and Environment 265:513-523.

 

54. Ward, A.S., J.A. Morgan, J.R. White, and T.V. Royer. 2018. Streambed restoration to remove fine sediments alters reach-scale transient storage in a low-gradient fifth-order river, Indiana, USA. Hydrological Processes 32:1786-1800.

 

53. Kumar, P., P.V.V. Le, A.N.T. Papanicolaou, B.L. Rhoads, A.M. Anders, A. Stumpf, C.G. Wilson, E.A. Bettis III, N. Blair, A.S. Ward, T. Filley, H. Lin, L. Keefer, D.A. Keefer, Y-F. Lin, M. Muste, T.V. Royer, E. Foufoula-Georgiou, and P. Belmont. 2018. Critical transition in critical zone of intensively managed landscapes. Anthropocene 22:10-19.

 

52. Christopher, S.F., J.L. Tank, U.H. Mahl, H. Yen, J.G. Arnold, M.T. Trentman, S.P. Sowa, M.E. Herbert, J.A. Ross, M.J. White, and T.V. Royer. 2017. Modeling nutrient removal using watershed-scale implementation of the two-stage ditch. Ecological Engineering 108:358-369.

 

51. Griffiths, N.A., J.L. Tank, T.V. Royer, E.J. Rosi, A.J. Shogren, T.C. Frauendorf. 2017. Occurrence, leaching, and degradation of Cry1Ab protein from transgenic maize detritus in agricultural streams. Science of the Total Environment 592:97-105.

 

50. Ghosh, S., P.A. Ayayee, O.J. Valverde-Barrantes, C.B. Blackwood, T.V. Royer, and L.G. Leff. 2017. Initial nitrogen enrichment conditions determines variations in nitrogen substrate utilization by heterotrophic bacterial isolates. BMC Microbiology 17:87 DOI 10.1186/s12866-017-0993-7

 

49. Royer, T.V. 2016. Human-dominated rivers and river management in the Anthropocene. Pages 491-524 in (J.B. Jones and E.H. Stanley, editors) “Stream Ecosystems in a Changing Environment”. Elsevier, New York.

 

48. Abelkop, A.D.K., J.D. Graham, and T.V. Royer. 2015. Persistent, Bioaccumulative, and Toxic (PBT) Chemicals: Technical Aspects, Policies, and Practices. CRC Press, Boca Raton, Florida.

 

47. Oviedo-Vargas, D. and T.V. Royer. 2015. The role of dissolved organic nitrogen in a nitrate-rich agricultural stream. Journal of Environmental Quality 44:668-675.

 

46. Warner, D.L., D. Oviedo-Vargas, and T.V. Royer. 2015. Evaluation of passive samplers for the collection of dissolved organic matter in streams. Environmental Monitoring and Assessment 187:4208

 

45. Manis, E., T.V. Royer, L.T. Johnson, and L.G. Leff. 2014. Denitrification in agriculturally impacted streams: seasonal changes in structure and function of the bacterial community. PLoS ONE 9:e105149

 

44. Oviedo-Vargas, D., T.V. Royer, and L.T. Johnson. 2013. Dissolved organic carbon manipulation reveals coupled cycling of carbon, nitrogen and phosphorus in a nitrogen-rich stream. Limnology and Oceanography 58:1196-1206.

 

43. Griffiths, N.A., J.L. Tank, T.V. Royer, S.S. Roley, E.J. Rosi-Marshall, M.R. Whiles, J.J. Beaulieu, and L.T. Johnson. 2013. Agricultural land use alters the seasonality and magnitude of stream metabolism. Limnology and Oceanography 58:1513-1529.

 

42. Rosi-Marshall, E.J., D. Kincaid, H. Bechtold, T.V. Royer, M. Rojas, and J.J. Kelly. 2013. Pharmaceuticals suppress algal growth and microbial respiration and alter bacterial communities in stream biofilms. Ecological Applications 23:583-593.

 

41. Baxter, A.J., L. Johnson, T. Royer, and L.G. Leff. 2013. Spatial differences in denitrification and bacterial community structure of streams: relationships with environmental conditions. Aquatic Sciences 75:275-317.

 

40. Johnson, L.T., T.V. Royer, J.M. Edgerton, and L.G. Leff. 2012. Manipulation of the dissolved organic carbon pool in an agricultural stream: responses in microbial community structure, denitrification, and assimilatory nitrogen uptake. Ecosystems 15:1027-1038.

 

39. Rosi-Marshall, E.J. and T.V. Royer. 2012. Pharmaceutical compounds and ecosystem function: an emerging research challenge for aquatic ecologists. Ecosystems 15:867-880.

 

38. Baxter, A.J., L. Johnson, J. Edgerton, T. Royer, and L.G. Leff. 2012. Structure and function of denitrifying bacterial assemblages in low-order Indiana streams. Freshwater Science 31:304-317.

 

37. Griffiths, N.A., J.L. Tank, T.V. Royer, T.J. Warrner, T.C. Frauendorf, E.J. Rosi-Marshall, and M.R. Whiles. 2012. Temporal variation in organic carbon spiraling in Midwestern agricultural streams. Biogeochemistry 108:149-169.

 

36. Das, M., T.V. Royer, and L.G. Leff. 2011. Interaction between aquatic bacteria and an aquatic hyphomycete on decomposing maple leaves. Fungal Ecology 5:236-244.

 

35. Gardner, K.M. and T.V. Royer. 2010. Effect of road salt application on seasonal chloride concentrations and toxicity in south-central Indiana streams. Journal of Environmental Quality 39:1036–1042.

 

34. Tank, J.L., E.J. Rosi-Marshall, T.V. Royer, M.R. Whiles, N.A. Griffiths, T.C. Frauendorf, and D.J. Treering. 2010. Occurrence of maize detritus and a transgenic insecticidal protein (Cry1Ab) within the stream network of an agricultural landscape.  Proceedings of the National Academy of Sciences 107:17645-17650.

 

33. Chambers, C.P.,  M.R. Whiles, E.J. Rosi-Marshall, J.L. Tank, T.V. Royer, N.A. Griffiths, M.A. Evans-White, and A. Stojak. 2010. Responses of stream macroinvertebrates to Bt maize leaf detritus. Ecological Applications 20:1949-1960.

 

32. Warrner, T.J., T.V. Royer, J.L. Tank, N.A. Griffiths, E.J. Rosi-Marshall, and M.R. Whiles. 2009. Dissolved organic carbon in streams from artificially drained and intensively farmed watersheds in Indiana, USA. Biogeochemistry 95:295–307.

 

31. Gentry, L.E., M.B. David, F.E. Below, T.V. Royer, and G.F. McIsaac. 2009. Nitrogen mass balance of a tile-drained agricultural watershed in east-central Illinois. Journal of Environmental Quality 38:1841–1847.

 

30. Griffiths, N.A., J.L. Tank, T.V. Royer, E.J. Rosi-Marshall, M.R. Whiles, C.P. Chambers, T.C. Frauendorf, M.A. Evans-White. 2009. Rapid decomposition of maize detritus in agricultural headwater streams. Ecological Applications 19:133–142.

 

29. McDaniel, M.D., M.B. David, and T.V. Royer. 2009. Relationships between benthic sediments and water column phosphorus in Illinois streams. Journal of Environmental Quality 38:607–617.

 

28. Royer, T.V., M.B. David, L.E. Gentry, C.A. Mitchell, K.M. Starks, T. Heatherly, and M.R. Whiles. 2008. Assessment of chlorophyll-a as a criterion for establishing nutrient standards in the streams and rivers of Illinois. Journal of Environmental Quality 37:437–447.

 

27. Das, M., T.V. Royer, and L.G. Leff. 2008. Fungal communities on decaying leaves in streams: A comparison of two leaf species. Mycological Progress 7:267–275.

 

26. Rosi-Marshall, E.J., J.L. Tank, T.V. Royer, M.R. Whiles, M. Evans-White, C. Chambers, N.A. Griffiths, J. Pokelsek, and M.L. Stephen. 2007. Toxins in transgenic crop byproducts may affect headwater streams.  Proceedings of the National Academy of Sciences 104:16204–16208.

 

25. Heatherly, T., M.R. Whiles, T.V. Royer, and M.B. David. 2007. Relationships between habitat quality, water quality, and macroinvertebrate assemblages in Illinois streams. Journal of Environmental Quality 36:1653–1660.

 

24. Arango, C.P., J.L. Tank, J.L. Schaller, T.V. Royer, M.J. Bernot, and M.B. David. 2007. Benthic organic carbon influences denitrification in streams with high nitrate concentration. Freshwater Biology 52:1210–1222.

 

23. Das, M., T.V. Royer, and L.G. Leff. 2007. Diversity of fungi, bacteria, and actinomycetes on leaves decomposing in a stream. Applied and Environmental Microbiology 73:756–767.

 

22. Gentry, L.E., M.B. David, T.V. Royer, C.A. Mitchell, and K.M. Starks. 2007. Phosphorus transport pathways to streams in tile-drained agricultural watersheds. Journal of Environmental Quality 36:408–415.

 

21. David, M.B., L.G. Wall, T.V. Royer, and J.L. Tank. 2006. Denitrification and the nitrogen budget of a reservoir in an agricultural landscape. Ecological Applications 16:2177–2190.

 

20. Royer, T.V., M.B. David, and L.E. Gentry. 2006. Timing of riverine export of nitrate and phosphorus from agricultural watersheds in Illinois: implications for reducing nutrient loading to the Mississippi River. Environmental Science & Technology 40:4126–4131.

 

19. Figueroa-Nieves, D., T.V. Royer, and M.B. David. 2006. Controls on chlorophyll-a in nutrient-rich agricultural streams in Illinois, USA. Hydrobiologia 568:287–298.

 

18. Morgan, A.M., T.V. Royer, M.B. David, and L.E. Gentry. 2006. Relationships among nutrients, chlorophyll-a, and dissolved oxygen in agricultural streams in Illinois. Journal of Environmental Quality 35:1110–1117.

 

17. Bernot, M.J., J.L. Tank, T.V. Royer, and M.B. David. 2006. Nutrient uptake in streams draining agricultural catchments of the midwestern United States. Freshwater Biology 51:499–509.

 

16. Thomas, S.A., T.V. Royer, E.B. Snyder, and J.C. Davis. 2005. Organic carbon spiraling in an Idaho river. Aquatic Sciences 67:424–433.

 

15. Royer, T.V. and M.B. David. 2005. Export of dissolved organic carbon from agricultural streams in Illinois, USA. Aquatic Sciences 67:465–471.

 

14. Wall, L.G., J.L. Tank, T.V. Royer, and M.J. Bernot. 2005. Spatial and temporal variability in sediment denitrification within an agriculturally influenced reservoir.  Biogeochemistry 76:85–111.

 

13. Schaller, J.L., T.V. Royer, M.B. David, and J.L. Tank. 2004. Denitrification associated with plants and sediments in an agricultural stream. Journal of the North American Benthological Society 23:667–676.

 

12. Royer, T.V., J.L. Tank, and M.B. David. 2004. Transport and fate of nitrate in headwater agricultural streams in Illinois. Journal of Environmental Quality 33:1296–1304.

 

11. Minshall, G.W., T.V. Royer, and C.T. Robinson. 2004. Stream ecosystem responses to fire: the

first ten years.  Pages 165–188 in (L.L. Wallace, editor) “After the fires: the ecology of change in Yellowstone National Park”. Yale University Press, New Haven, Conn.

 

10. Royer, T.V. and G.W. Minshall. 2003. Controls on leaf processing in streams from spatial-scaling and hierarchical perspectives. Journal of the North American Benthological Society 22:352–358.

 

9. Royer, T.V. and G.W. Minshall. 2001. Effects of nutrient enrichment and leaf quality on the breakdown of leaves in a hardwater stream. Freshwater Biology 46:603–610.

 

8. Royer, T.V., C.T. Robinson, and G.W. Minshall. 2001. Development of a macroinvertebrate-based index for bioassessment of Idaho rivers. Environmental Management 27:627–636.

           

7. Minshall, G.W., T.V. Royer, and C.T. Robinson. 2001. Response of the Cache Creek macroinvertebrates during the first 10 years following disturbance by the 1988 Yellowstone wildfires. Canadian Journal of Fisheries and Aquatic Sciences 58:1077–1088.

 

6. Thomas, S.A., T.V. Royer, G.W. Minshall, and E.B Snyder. 2003. Assessing the historic contribution of marine-derived nutrients to Idaho streams. Pages 41–55 in (J.G. Stockner, editor) “Nutrients in salmonid ecosystems: sustaining production and biodiversity”. American Fisheries Society, Symposium 34, Bethesda, Maryland.

 

5. Robinson, C.T., G.W. Minshall, and T.V. Royer. 2000. Inter-annual patterns in macroinvertebrate communities of wilderness streams in Idaho, USA. Hydrobiologia 421:187–198.

 

4. Royer, T.V., M.T. Monaghan, and G.W. Minshall. 1999. Processing of native and exotic leaf litter in two Idaho (USA) streams. Hydrobiologia 400:123–128.

 

3. Royer, T.V. and G.W. Minshall. 1997. Temperature patterns in small streams following wildfire. Archiv für Hydrobiologie 140:237–242.

 

2. Royer, T.V. and G.W. Minshall. 1997. Rapid breakdown of autochthonous and allochthonous plant material in a eutrophic river. Hydrobiologia 344:81–86.

 

1. Minshall, G.W., C.T. Robinson, T.V. Royer, and S.R. Rushforth. 1995. Benthic community structure in two adjacent streams in Yellowstone National Park five years after the 1988 wildfires. Great Basin Naturalist 55:193–200.