Nigel D'Souza, Ph.D.

Assistant Professor, Biology and Environmental Studies and Sciences

I earned my undergraduate and graduate degrees in Microbiology and Zoology from the University of Pune (India), and my Ph.D. in Biology from Bowling Green State University, where I specialized in phytoplankton and microbial ecology. Over the years, m...

Nigel D'Souza, Ph.D.

Contact Information

Education & Curriculum Vitae

Ph.D. Biology, Bowling Green State University, Ohio, USA
M.Sc. Zoology with a specialization in Molecular Biology, University of Pune, India
B.Sc. Microbiology, University of Pune, India

Courses Taught

ENVS 110/L – Earth Systems
ENVS 103/L – Environmental Biology
ENVS 200 – Case Studies in Environmental Science
BIOL 106 – Energy Flow in Biological Systems
BIOL 370/L – Microbiology
BIOL 425/L (ENVS 409/L) - Ecotoxicology
BIOL 399 – Advanced topics in Biology
BIOL 498 – Research in Microbial Ecology


Biography Publications Research

I earned my undergraduate and graduate degrees in Microbiology and Zoology from the University of Pune (India), and my Ph.D. in Biology from Bowling Green State University, where I specialized in phytoplankton and microbial ecology. Over the years, my research journey has spanned diverse field settings - from the Laurentian Great Lakes to Antarctic ice, and the Gulf of Mexico. Before joining Gonzaga University in 2022, I held postdoctoral research positions at Columbia University, Georgia Tech, The University of Rhode Island, and the University of California Santa Barbara; and served as a Visiting Assistant Professor at the University of Louisiana.

I continue to be passionate about research on marine and freshwater microorganisms – specifically on how they keep the planet functioning the way we know it, and on how human activity – such as pollution and climate change affect these invisible, yet critical microbial ecosystems.

At Gonzaga, I teach multiple lower and upper-division courses in Biology and Environmental Science, where I emphasize curiosity-driven learning, critical thinking, and problem-solving. In doing so, I hope to cultivate a sense of curiosity about the environment, our place in it, and the impact we can have on it.

  • Sweet J. A., D’Souza N. A., Holmes W., Shoemaker D., Stauffer B. A. Can zinc influence toxic cyanobacterial blooms? Exploring zinc-mediated regulation of growth and toxin production in the cyanobacterium Microcystis aeruginosa. (In prep, for submission to Harmful Algae in August 2026)
  • D'Souza, N. A., Hebner, C. J., & Stauffer, B. A. (2026). Effects of rapid and sustained changes in light and salinity on Heterosigma akashiwo (Raphidophyceae).  Journal of Phycology, 62, 1108–1122. (Link)
  • Kane, E.A.; Yadav, S.V.K.; Fogle, A.; D’Souza, N.A.; DeLisi, N.; Caillouët, K.A. (2024) Battle of the Bites: The Effect of Sewage Effluent Exposure on Mosquitofish Biocontrol of Mosquitoes in Residential Louisiana. Toxics, 12, 259. (Link)
  • Connolly B.M., D’Souza N.A., Zimmerman N, Zobitz J. (2024) Breaking It Down: What Factors Control Microbial Decomposition Rates? CourseSource 11. (Link)
  • Iwaloye, O.F., Michaud, B., Alloy, T., D'Souza, N., McKay, R.M.L., Morris, P., Gura, C. and Rogers, S.O. (2024) Lake Erie ice is a repository of organisms. Microbiology Resource Announcements, pp.e01094-23. (Link)
  • Roohani K, Haubrich BA, Yue K, D’Souza N, Montalbano A, Rynearson T, Menden-Deuer S, Reid CW. 2019. Trophic upgrading and mobilization of wax esters in microzooplankton. PeerJ 7:e7549. (Link)
  • Rozmarynowycz, M.J., Beall, B.F., Bullerjahn, G.S., Small, G.E., Sterner, R.W., Brovold, S.S., D'Souza, N.A., Watson, S.B. and McKay, R.M.L., 2019. Transitions in microbial communities along a 1600 km freshwater trophic gradient. Journal of Great Lakes Research, 45(2), pp.263-276. (Link)
  • D'Souza, N.A., Subramaniam, A., Juhl, A.R., Hafez, M., Chekalyuk, A., Phan, S., Yan, B., r Macdonald, I., Weber, S.C. and Montoya, J.P., 2016. Elevated surface chlorophyll associated with natural oil seeps in the Gulf of Mexico. Nature Geoscience, 9(3), p.215. (Link)
  • Edgar, R.E., Morris, P.F., Rozmarynowycz, M.J., D'Souza, N.A., Moniruzzaman, M., Bourbonniere, R.A., Bullerjahn, G.S., Phuntumart, V., Wilhelm, S.W. and McKay, R.M.L., 2016. Adaptations to photoautotrophy associated with seasonal ice cover in a large lake revealed by metatranscriptome analysis of a winter diatom bloom. Journal of Great Lakes Research, 42(5), pp.1007-1015. (Link)
  • Ziervogel, K., Osburn, C., Brym, A., Battles, J., Joye, S., D'Souza, N., Montoya, J., Passow, U. and Arnosti, C., 2016. Linking Heterotrophic Microbial Activities with Particle Characteristics in Waters of the Mississippi River Delta in the Aftermath of Hurricane Isaac. Frontiers in Marine Science, 3, p.8. (Link)
  • Ziervogel, K., Dike, C., Asper, V., Montoya, J., Battles, J., D'Souza, N., Passow, U., Diercks, A., Esch, M., Joye, S., Dewald, C. and Arnosti, C., 2016. Enhanced particle fluxes and heterotrophic bacterial activities in Gulf of Mexico bottom waters following storm-induced sediment resuspension. Deep Sea Research Part II: Topical Studies in Oceanography, 129, pp.77-88. (Link)
  • Ziervogel, K., D'Souza, N., Sweet, J., Yan, B. and Passow, U., 2014. Natural oil slicks fuel surface water microbial activities in the northern Gulf of Mexico. Front. in microbial., 5, p.188. (Link)
  • D'Souza, N.A., Kawarasaki, Y., Gantz, J.D., Lee Jr, R.E., Beall, B.F.N., Shtarkman, Y.M., Kocer, Z.A., Rogers, S.O., Wildschutte, H., Bullerjahn, G.S. and McKay, R.M.L., 2013. Diatom assemblages promote ice formation in large lakes. The ISME journal, 7(8), p.1632. (Link)
  • Saxton, M.A., D'Souza, N.A., Bourbonniere, R.A., McKay, R.M.L. and Wilhelm, S.W., 2012. Seasonal Si: C ratios in Lake Erie diatoms - evidence of an active winter diatom community. Journal of Great Lakes Research, 38(2), pp.206-211. (Link)
  • Twiss, M.R., McKay, R.M.L., Bourbonniere, R.A., Bullerjahn, G.S., Carrick, H.J., Smith, R.E.H., Winter, J.G., D'Souza, N.A., Furey, P.C., Lashaway, A.R. and Saxton, M.A., 2012. Diatoms abound in ice-covered Lake Erie: An investigation of offshore winter limnology in Lake Erie over the period 2007 to 2010. Journal of Great Lakes Research, 38(1), pp.18-30. (Link)
  • D'Souza, N. A. 2012. Psychrophilic diatoms in ice-covered Lake Erie (Doctoral dissertation, Bowling Green State University).

Research themes: Microbial Ecology, Phytoplankton Ecology, Environmental Toxicology, Marine and Freshwater Ecology, and Climate Change. 

As a microbial ecophysiologist, I study the response of marine & freshwater microbes to environmental change. My research questions are aimed at determining how these environmental changes impact microbial community composition, biogeochemical cycling (of elements like carbon, nitrogen, phosphorus, etc.), trophic transfer of carbon through microbial food webs, and changes in ecosystem services provided by these microbes. Most of my ongoing research projects focus on phytoplankton - single-celled photosynthetic organisms - that form the base of marine, and many freshwater food webs.

Over the past 15 years, I have led or contributed to projects on diverse topics such as the role of ice-associated microbes in the Great Lakes (and in Antarctica), the impacts of oil spills on microbial biogeography in the Gulf of Mexico, the effects of starvation and chemical stress on microbial grazers, and the effects of multiple simultaneous environmental stressors on the growth and photophysiology of marine microbes.

At Gonzaga, I integrate laboratory experiments with field observations to take a holistic approach to studying how environmental stressors - ranging from climate shifts to pollutants - impact the physiology and ecology of phytoplankton - single-celled photosynthetic organisms - that form the base of marine, and many freshwater food webs. Some of my ongoing projects include investigating how climate stressors impact biochemical and molecular processes of photosynthesis; how pollution in increasingly warming lakes influence the development of toxin-producing cyanobacterial blooms; and monitoring seasonal changes in microbial community composition and their environmental drivers across the Spokane River watershed.

If you’re passionate about working with microbes in the environment, or on issues involving the effects of toxic substances on ecosystems, please get in touch.