National Oceanic and
Atmospheric Administration
United States Department of Commerce



*=Stepien students, postdocs, technicians


Stepien, C.A., M.R. Snyder*, A.E. Elz*. 2019. Invasion genetics of the silver carp Hypophthalmichthys molitrix across North America: Differentiation of fronts, introgression, and eDNA metabarcode detection. PLOS One, 14(3): e0203012.

Marshall, N.T.*, C.A. Stepien. 2019. Invasion genetics from eDNA and thousands of larvae: A targeted metabarcoding assay that distinguishes species and population variation of zebra and quagga mussels. Ecology and Evolution. 1-24. DOI: 10.1002/ece3.498

Stepien, C.A., D. Leaman, M.D. Niner*. 2020. Rhabdoviruses (with focus on Viral Hemorrhagic Septicemia Virus and other Novirhabdoviruses). Chapter 4 In: Woo, P.T.K, J. Leong, & K. Buchmann. Climate Change and Infectious Fish Diseases. CABI, England, U.K.

Canonico, G., Buttigieg, P.L… Stepien, C., … et al. 2019. Global Observational Needs and Resources for Marine Biodiversity. Frontiers of Marine Science 6:367. doi: 10.3389/fmars.2019.00367

Marshall, N.T.*, C.A. Stepien. 2019. Dreissenidae. Ch. 36 In: Cummings, K. (ed). Freshwater Mollusks of the World. Johns Hopkins University Press.


Stepien, C.A., D. Eddins*, M. Snyder*, N. Marshall*. 2018. Genetic change versus stasis over the time course of invasions: Trajectories of two concurrent, allopatric introductions of the Eurasian ruffe. Aquatic Invasions (Special Issue: Biological Invasions in Inland Waters). 13(4):537-552. DOI:

Stepien, C.A., C. Knight, M. Snyder*. 2018. Genetic divergence of nearby walleye spawning groups in Central Lake Erie: implications for management. North American Journal of Fisheries Management. 38:783-793. DOI: 10.1002/nafm.10176

Tajbakhsk, F.*, C.A. Stepien, A. Abdoli, N. Tabatabaei, B.H. Kiabi. 2018. Geometric morphometric and meristic analysis of the deepwater goby, Ponticola bathybius (Kessler, 1877) (Teleostei: Gobiidae) in the Iranian waters of the Caspian Sea. Iranian J. Icthyology. 5(1):64-73. DOI: 10.22034/iji.v5i1.257

Shepherd, B.S., A.R. Spear, A.M. Philip, D.W. Leaman, C.A. Stepien, O.J. Sepulveda-Villet, D.E. Palmquist, M.M. Vijayan. 2018. Effects of cortisol and lipopolysaccharide on expression of select growth-, stress- and immune-related genes in rainbow trout liver. Journal of Shellfish Immunology 74:410-418.DOI: 10.1016/j.fsi.2018.01.003


Klymus, K.E.*, N.T. Marshall*, & C.A. Stepien. 2017. Environmental DNA (eDNA) metabarcoding assays to detect invasive invertebrate species in the Great Lakes. PLOS One.

Trebitz, A., J. Hoffman, J. Darling, E. Pilgrim, J. Kelly, E. Brown, W. Chadderton, S. Egan, E. Grey, S. Hashsham, K. Klymus*, A. Mahon, J. Ram, M. Schultz, C.A. Stepien, J. Schardt. 2017. Early detection monitoring for aquatic non-indigenous species: Optimizing surveillance, incorporating advanced technologies, and identifying research needs. Journal of Environmental Management. 202(1): 299-310 doi: 10.1016/j.jenvman.2017.07.045

Ke, Q., W. Weaver, A. Pore, B. Gorgoglione, J. H. Wildschutte, P. Xiao, B.S. Shepherd, A. Spear, M. Krishnamurthy, C.A. Stepien, V.N. Vakharia, D.W. Leaman. 2017. Role of Viral Hemorrhagic Septicemia virus (VHSv) matrix (M) protein in suppressing host transcription. Journal of Virology.

Snyder, M.E.* & C.A. Stepien (co first-authors). 2017. Genetic patterns across an invasion's history: a test of change versus stasis for the Eurasian round goby in North America. Molecular Ecology. doi: 10.1111/mec.13997 (published online early) Featured on NOAA PMEL website:

Stepien, C.A., S.I. Karsiotis*, T.J. Sullivan*, K.E. Klymus. 2017. Population genetic structure and comparative diversity of smallmouth bass: Congruent patterns from two genomes. Journal of Fish Biology. 90(5): 2125-2147 doi:10.1111/jfb.13296.

Stepien, C.A.**, F. Calzonetti, J.M. Bossenbroek, K.P. Czajkowski, T.L. Bollin & C.L. Gruden. 2017. Enhancing environmental sustainability through a university field station. Ch. 7, pp. 111-147 In: A. Kumar and D. Kim (eds). Sustainability Practice and Education on University Campuses and Beyond. Bentham Science Publishers, Sharjah, UAE. eISBN(Online): 978-1-68108-471-8, ISBN (Print): 978-1-68108-472-5

Upcoming and In Review:

Marshall, N.T.* & C.A. Stepien. Invasion genetic patterns across time and space: Trajectories of zebra and quagga mussels in two allopatric populations. In revision.

Marshall, N.T.* & C.A. Stepien. Targeted environmental (e)DNA metabarcoding in a large river: Macroinvertebrate community diversity and habitat quality.

Niner, M.* & C.A. Stepien. Evolutionary trajectory of the fish Viral Hemorrhagic Septicemia virus across its history in the Laurentian Great Lakes: Spatial and temporal patterns.

Niner, M.*, C.A. Stepien, B. Gorgoglione, D.W. Leaman. Genomic and immunogenic changes across the evolutionary history of viral hemorrhagic septicemia (VHS-IVb) fish virus (Piscine novirhabdovirus) in the Laurentian Great Lakes.

Snyder, M.R.*, C.A. Stepien, N. Marshall*, H. Scheppler*, C. Black, K. Czajkowski. Detecting aquaticinvasive species in bait and pond stores with targeted environmental DNA high-throughput sequencing metabarcode assays: angler, retailer, and manager implications.

Snyder, M.R*. & C.A. Stepien**. Increasing confidence in species compositions discerned with multiple environmental DNA meta barcode high-throughput sequencing assays: community profiling of Great Lakes fishes.