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Dr. Jim Junker

Research Assistant Professor

University of North Texas

Department of Biological Sciences

(940) 369-5077

Email: James.Junker@unt.edu

Professional Positions

    Academic - Post-Secondary

  • Postdoctoral Researcher, Michigan Technological University. Michigan Technological University. (2021 - 2023).

Professional Memberships

  • Society for Freshwater Science. (January 1, 2024 - Present).

Research

Published Intellectual Contributions

    Journal Article

  • Novak, B., Murry, B.A., Wesner, J.S., Gjoni, V., Arantes, C.C., Shepta, E., Pomeranz, J.P., Junker, J., Zipfel, K., Stump, A., Solomon, L.E., Maxson, K.A., DeBoer, J.A. (2024). Threshold responses of freshwater fish community size spectra to invasive species. Ecosphere. 15 (12) Wiley. https://doi.org/10.1002/ecs2.70090
  • Glassic, H.C., Junker, J., Guy, C.S., Tronstad, L.M., Briggs, M.A., Albertson, L.K., Lujan, D.R., Brenden, T.O., Walsworth, T.E., Koel, T.M. (2024). An Invasive Predator Substantially Alters Energy Flux Without Changing Food Web Functional State or Stability. Other. 34 (9) Wiley. https://doi.org/10.1002/aqc.4240
  • Junker, J., Cross, W.F., Hood, J.M., Benstead, J.P., Huryn, A.D., Nelson, D., Ólafsson, J.S., Gíslason, G.M. (2024). Environmental warming increases the importance of high‐turnover energy channels in stream food webs. Ecology. 105 (6) Wiley. https://doi.org/10.1002/ecy.4314
  • Wesner, J.S., Pomeranz, J.P., Junker, J., Gjoni, V. (2024). Bayesian hierarchical modelling of size spectra. Other. 15 (5) 856-867. Wiley. https://doi.org/10.1111/2041-210x.14312
  • Junker, J. (2024). Maximum likelihood outperforms binning methods for detecting differences in abundance size spectra across environmental gradients. Other. https://doi.org/10.1111/1365-2656.14044
  • Junker, J. (2023). Landscape diversity promotes stable food‐web architectures in large rivers. Other. https://doi.org/10.1111/ele.14289
  • Junker, J. (2023). Can biodiversity of preexisting and created salt marshes match across scales? An assessment from microbes to predators. Other. https://doi.org/10.1002/ecs2.4461
  • Junker, J. (2022). Individual size distributions across North American streams vary with local temperature. Global Change Biology. https://doi.org/10.1111/gcb.15862
  • Junker, J. (2022). Influence of biomimicry structures on ecosystem function in a Rocky Mountain incised stream. Other. https://doi.org/10.1002/ecs2.3897
  • Junker, J. (2021). Flow is more Important than Temperature in Driving Patterns of Organic Matter Storage and Stoichiometry in Stream Ecosystems. Ecosystems. https://doi.org/10.1007/s10021-020-00585-6
  • Junker, J., Cross, W.F., Benstead, J.P., Huryn, A.D., Hood, J.M., Nelson, D., Gíslason, G.M., Ólafsson, J.S., Ghalambor, C. (2020). Resource supply governs the apparent temperature dependence of animal production in stream ecosystems. Ecology Letters. 23 (12) 1809-1819. Wiley. https://doi.org/10.1111/ele.13608
  • Junker, J. (2020). Contrasting responses of black fly species (Diptera: Simuliidae) to experimental whole‐stream warming. Freshwater Biology. https://doi.org/10.1111/fwb.13583
  • Junker, J. (2020). Thermal niche diversity and trophic redundancy drive neutral effects of warming on energy flux through a stream food web. Ecology. http://dx.doi.org/10.1002/ecy.2952
  • Junker, J. (2019). DOM composition alters ecosystem function during microbial processing of isolated sources. Other. https://doi.org/10.1007/s10533-018-00534-5
  • Junker, J. (2017). Increased resource use efficiency amplifies positive response of aquatic primary production to experimental warming. Global Change Biology.
  • Nelson, D., Benstead, J.P., Huryn, A.D., Cross, W.F., Hood, J.M., Johnson, P.W., Junker, J., Gíslason, G.M., Ólafsson, J.S. (2017). Experimental whole‐stream warming alters community size structure. Global Change Biology. 23 (7) 2618-2628. Wiley. https://doi.org/10.1111/gcb.13574
  • Nelson, D., Benstead, J.P., Huryn, A.D., Cross, W.F., Hood, J.M., Johnson, P.W., Junker, J., Gíslason, G.M., Ólafsson, J.S. (2017). Shifts in community size structure drive temperature invariance of secondary production in a stream‐warming experiment. Ecology. 98 (7) 1797-1806. Wiley. https://doi.org/10.1002/ecy.1857
  • Junker, J. (2014). Seasonality in the trophic basis of a temperate stream invertebrate assemblage: Importance of temperature and food quality. Other.
  • Junker, J. (2012). Impacts of Warming on the Structure and Functioning of Aquatic Communities. Other.

Presentations Given

    Invited Talk

  • Junker, J.R. (Author & Presenter), The influence of temperature on energy flow, food web dynamics, and community assembly in streams, Tarleton State University, Stevenville, TX, United States of America. (2024 - 2024).
  • Junker, J.R. (Author & Presenter), The influence of temperature on energy flow, food web dynamics, and community assembly in streams, University of South Dakota, Vermillion, SD, United States of America. (2024 - 2024).
  • Junker, J.R. (Author & Presenter), The effects of temperature on energy flow in streams from individuals to ecosystems, University of North Texas, Denton, TX, United States of America. (2024).

    • Oral Presentation

  • D'Andrilli, J. (Author & Presenter), Junker, J. (Author), Silverman, V. (Author), Goranov, A.I. (Author), Hatcher, P.G. (Author), Demars, B. (Author), QUANTOM River Tana Project Meeting, Understanding DOM molecular transformations in metabolic chambers, Norwegian Institute for Water Research, Oslo, Norway, Norway. (2024 - 2024).
  • D'Andrilli, J. (Author & Presenter), Silverman, V. (Author), Goranov, A.I. (Author), Hatcher, P.G. (Author), Junker, J. (Author), Demars, B. (Author), QUANTOM River Tana Project Meeting, Biogeochemical interpretations of dissolved organic matter by FT-ICR MS: DOM molecular fingerprinting, chemical characterization, and lability analysis, Norwegian Institute for Water Reserach, Oslo, Norway, Norway. (2024 - 2024).
  • Demars, B. (Author & Presenter), McGovern, M. (Author), Jackson-Blake, L. (Author), Sample, J. (Author), Norline, M. (Author), Hogda, K. (Author), Karlsen, S. (Author), Dorsch, P. (Author), Stutter, M. (Author), Thornton, B. (Author), Junker, J. (Author), D'Andrilli, J. (Author), European Geosciences Union, QUANTOM – QUANTification of dissolved Organic Matter and the metabolic balance in river networks: mechanisms and model simulations of CO2 emissions, Vienna, Austria, Austria. (2024 - 2024).

    • Poster

  • Coronado, E.A. (Author & Presenter), Deckard, G. (Author), Graffam, C. (Author), Montenegro, A. (Author), Renfrow, J. (Author), Junker, J.R. (Author), Compson, Z.G. (Author), D'Andrilli, J. (Author), Bohenek, J. (Author), AERI Research Day, Leaf litter decomposition drives ‘hot moments’ and mosquito activity in freshwater ecosystems, AERI and UNT, Sulphur, Oklahoma, United States of America. (2024 - 2024).
  • Gjoni, V. (Author & Presenter), Pomeranz, J.P. (Author), Junker, J.R. (Author), Wesner, J.S. (Author), NSF Macrosystems Biology Community Virtual Meeting, Size Spectra in freshwater streams are consistent across temperature and resource supply, National Science Foundation, Virtual, United States of America. (2024 - 2024).

Service

Professional Service

  • Committee Member, Society for Freshwater Science. Logan, UT. (January 1, 2024 - Present).