Dr. Arthur Zastepa

Image Arthur Zastepa
Research Scientist

Chemical and microbial ecology of cyanobacterial and harmful algal blooms and their impacts in large inland waters.

Current research and/or projects

Contributing to Environment and Climate Change Canada’s mandate to ensure aquatic ecosystems are conserved and protected. Contributing to Water Science and Technology Branch by conducting research on drivers and effects of cyanobacterial and harmful algal blooms.


    Education and awards

    N.S.E.R.C. Visiting Fellowships in Canadian Government Laboratories

    Ph.D., Chemical and Environmental Toxicology Program, Department of Biology, University of Ottawa. Thesis: Fate and Persistence of Microcystin Congeners in Lakes and Lake Sediments (2014).

    Hon. B.Sc. Laboratory Medicine and Pathobiology (minor Analytical Chemistry), University of Toronto (2006)

    Key publications

    McKay, R.M., Frenken, T., Diep, N., Cody, W.R., Crevecoeur, S., Dove, A., Drouillard, K.G., Ortiz, X., Wintermute, J., Zastepa, A.
    Bloom announcement: An early autumn cyanobacterial bloom co-dominated by Aphanizomenon flos-aquae and Planktothrix agardhii in an agriculturally-influenced Great Lakes tributary (Thames River, Ontario, Canada)
    (2020) Data in Brief, 30, art. no. 105585, .

    Favot, E.J., Hadley, K.R., Paterson, A.M., Michelutti, N., Watson, S.B., Zastepa, A., Hutchinson, N.J., Vinebrooke, R.D., Smol, J.P.
    Using visible near-infrared reflectance spectroscopy (VNIRS) of lake sediments to estimate historical changes in cyanobacterial production: potential and challenges
    (2020) Journal of Paleolimnology, .

    Wood, S.A., Kelly, L.T., Bouma-Gregson, K., Humbert, J.-F., Laughinghouse, H.D., IV, Lazorchak, J., McAllister, T.G., McQueen, A., Pokrzywinski, K., Puddick, J., Quiblier, C., Reitz, L.A., Ryan, K.G., Vadeboncoeur, Y., Zastepa, A., Davis, T.W.
    Toxic benthic freshwater cyanobacterial proliferations: Challenges and solutions for enhancing knowledge and improving monitoring and mitigation
    (2020) Freshwater Biology, .

    Li, J., Plouchart, D., Zastepa, A., Dittrich, M.
    Picoplankton accumulate and recycle polyphosphate to support high primary productivity in coastal Lake Ontario
    (2019) Scientific Reports, 9 (1), art. no. 19563, .

    Taranu, Z.E., Pick, F.R., Creed, I.F., Zastepa, A., Watson, S.B.
    Meteorological and nutrient conditions influence microcystin congeners in freshwaters
    (2019) Toxins, 11 (11), art. no. 620, .

    Kelly, N.E., Javed, A., Shimoda, Y., Zastepa, A., Watson, S., Mugalingam, S., Arhonditsis, G.B.
    A Bayesian risk assessment framework for microcystin violations of drinking water and recreational standards in the Bay of Quinte, Lake Ontario, Canada
    (2019) Water Research, 162, pp. 288-301.

    Markovic, S., Liang, A., Watson, S.B., Depew, D., Zastepa, A., Surana, P., Byllaardt, J.V., Arhonditsis, G., Dittrich, M.
    Reduction of industrial iron pollution promotes phosphorus internal loading in eutrophic Hamilton Harbour, Lake Ontario, Canada
    (2019) Environmental Pollution, 252, pp. 697-705.

    Binding, C.E., Zastepa, A., Zeng, C.
    The impact of phytoplankton community composition on optical properties and satellite observations of the 2017 western Lake Erie algal bloom
    (2019) Journal of Great Lakes Research, 45 (3), pp. 573-586.

    Pilon, S., Zastepa, A., Taranu, Z.E., Gregory-Eaves, I., Racine, M., Blais, J.M., Poulain, A.J., Pick, F.R.
    Contrasting histories of microcystin-producing cyanobacteria in two temperate lakes as inferred from quantitative sediment DNA analyses
    (2019) Lake and Reservoir Management, 35 (1), pp. 102-117.

    Prater, C., Frost, P.C., Howell, E.T., Watson, S.B., Zastepa, A., King, S.S.E., Vogt, R.J., Xenopoulos, M.A.
    Variation in particulate C : N : P stoichiometry across the Lake Erie watershed from tributaries to its outflow
    (2017) Limnology and Oceanography, 62, pp. S194-S206.

    Zastepa, A., Pick, F.R., Blais, J.M.
    Distribution and flux of microcystin congeners in lake sediments
    (2017) Lake and Reservoir Management, 33 (4), pp. 444-451.

    Zastepa, A., Watson, S.B., Kling, H., Kotak, B.
    Spatial and temporal patterns in microcystin toxins in Lake of the Woods surface waters
    (2017) Lake and Reservoir Management, 33 (4), pp. 433-443.

    Watson, S.B., Zastepa, A., Boyer, G.L., Matthews, E.
    Algal bloom response and risk management: On-site response tools
    (2017) Toxicon, 129, pp. 144-152.

    Zastepa, A., Taranu, Z.E., Kimpe, L.E., Blais, J.M., Gregory-Eaves, I., Zurawell, R.W., Pick, F.R.
    Reconstructing a long-term record of microcystins from the analysis of lake sediments
    (2017) Science of the Total Environment, 579, pp. 893-901.

    Zastepa, A., Pick, F.R., Blais, J.M., Saleem, A.
    Analysis of intracellular and extracellular microcystin variants in sediments and pore waters by accelerated solvent extraction and high performance liquid chromatography-tandem mass spectrometry
    (2015) Analytica Chimica Acta, 872, pp. 26-34.

    Zastepa, A., Pick, F.R., Blais, J.M.
    Fate and Persistence of Particulate and Dissolved Microcystin-LA from Microcystis Blooms
    (2014) Human and Ecological Risk Assessment, 20 (6), pp. 1670-1686.

    Twiss, M.R., Ulrich, C., Zastepa, A., Pick, F.R.
    On phytoplankton growth and loss rates to microzooplankton in the epilimnion and metalimnion of Lake Ontario in mid-summer
    (2012) Journal of Great Lakes Research, 38 (SUPPL.4), pp. 146-153.

    Sidiropoulos, K.G., Zastepa, A., Adeli, K.
    Translational control of apolipoprotein B mRNA via insulin and the protein kinase C signaling cascades: Evidence for modulation of RNA-protein interactions at the 5′UTR
    (2007) Archives of Biochemistry and Biophysics, 459 (1), pp. 10-19.