Stacy A. Krueger-Hadfield headshot.

Assistant Professor This email address is being protected from spambots. You need JavaScript enabled to view it.
Campbell Hall 495A
(205) 934-6034

Lab website

Research and Teaching Interests: Evolutionary Ecology, Population Genetics, Phycology, Scientific Communication

Office Hours: By appointment


  • B.S., California State University Northridge, Environmental Biology
  • M.S., California State University Northridge, Marine Biology
  • Ph.D., Pontificia Universidad Católica de Chile, Marine Ecology
  • Ph.D., Université de Pierre et Marie Curie Sorbonne Universités, Molecular Ecology/Phycology

I grew up in the San Fernando Valley in southern California. Regular trips to the seaside and tide pools along the central coast and Monterey Bay engendered a lifelong interest in marine biology. I obtained my B.S. and M.S. from California State University Northridge. I then embarked on my dissertation research at the Station Biologique de Roscoff and the Pontificia Universidad Católica de Chile. I earned a Ph.D. from each institution and had the opportunity to live and work in France and Chile. My postdoctoral work at the Marine Biological Association and at the Grice Marine Laboratory took me back to Chile, and to South Africa, Japan, and throughout North America and Europe sampling tunicates and algae.

Research Opportunities
If you are interested in joining the Krueger-Hadfield Evolutionary Ecology Lab, please send your CV and a short research proposal to This email address is being protected from spambots. You need JavaScript enabled to view it.. The research proposal should highlight your research interests and how you see those interests intersecting with our research themes.

In 2014, I became a regular contributor to the blog The Molecular Ecologist (TME) in which I write weekly shorts (and sometimes longer posts — see this post on my journey to becoming a marine biologist) on the latest in molecular ecology. In 2016, I joined the faculty at UAB and was able to develop a science communication course for graduate students. This has also recently included chairing the Darwin Day events (2018-present). My science communication work was recognized by the Ecological Society of America #MySciComm and my lab was recently highlighted by the Society for the Study of Evolution New Faculty Profile.

Research Interests

We use molecular biology, ecological theory, evolutionary theory, and natural history to explore marine and freshwater ecosystems. We typically use algal and invertebrate models to ask questions about the evolution of sex, mating systems, and life cycles. Check out the research conducted by Dr. Krueger-Hadfield and her lab on her website.

Recent Courses

  • BY 429/BY 491/BY 629: Introduction to Evolutionary Processes
  • BY 468/BY 668: Conservation Genetics
  • BY 655/BY 755: Biometry
  • BY 670/BY 770: Science Communication

Select Publications

  • Ryan, WH, L Adams, G Bonthond, N Mieszkowska, KE Pack, SA Krueger-Hadfield (accepted) Environmental regulation of individual body size contributes to geography variation in clonal life cycle expression. Marine Biology
  • Collado-Vides, L, B Van Tussenbroek, M Garcia, R Rodríguez-Martínez, V Cassano, MC Oliviera, M Toyota-Fuji, H Oxenford, SA Krueger-Hadfield (2019, in press) A network to develop a taxonomic, monitoring, and citizen’s participation program for Sargassum landings in Florida, Mexico, Barbados, and Brazil. Proceedings of the 71st Gulf and Caribbean Fishers Institute (editor reviewed)
  • Krueger-Hadfield, SA, AMH Blakeslee, AE Fowler (2019, in press) Incorporating policy into ecological and community genetics. Journal of Phycology doi: 10.1111/jpy.12906
  • Krueger-Hadfield, SA (2019, in press) What’s ploidy got to do with it? Understanding the evolutionary ecology of macroalgal invasions necessitates incorporating life cycle complexity. Evolutionary Applications doi:10.1111/eva.12843
  • Ryan, WH, S Heiser, MD Curtis, CD Amsler, T Bayer, G Bonthond, G Wang, F Weinberger, SA Krueger-Hadfield (2019) The use of photographic color information for high-throughput phenotypic of pigment concentration in Agarophyton vermiculophyllum. Cryptogamie Algologie 40: 73-83.
  • Marin-Felix, Y, M Hernández-Restrepo I Iturrieta-González, D García, J Gené, JZ Groenewald, L Cai, Q Chen, W Quaedvlieg, RK Schumacher, PWJ Taylor, C Ambers, G Bonthond, J Edwards, SA Krueger-Hadfield, JJ Luangsaard, L Morton, A Moslemi, M Sandoval-Denis, YP Tan, R Thangavel, N Vaghefi, R Cheewangkoon, PW Crous (2019) Genera of phytopathogenic fungi: GOPHY 3. Studies in Mycology 94: 1-124.
  • Schoenrock, KM, T O’Callaghan, R O’Callaghan, SA Krueger-Hadfield (2019) First record of Laminaria ochroleuca Bachelot de la Pylaie in Ireland in Béal an Mhuirthead, County Mayo. Marine Biodiversity Records 12:9.
  • Krueger-Hadfield SA, TA Stephens, WH Ryan*, S Heiser (2018) Everywhere you look, everywhere you go, there’s another non-native estuary with the widespread invader Gracilaria vermiculophylla. BioInvasion Records 7: 343-355.
  • Lees LE, SA Krueger-Hadfield, AJ Clark, EA Duermit, EE Sotka, CJ Murren (2018). Non-native Gracilaria vermiculophylla tetrasporophytes are more difficult to debranch and are less nutritious than gametophytes. Journal of Phycology.
  • Sotka EE, AW Baumgardner, PM Bippus, C Destombe, EA Duermit, H Endo, BA Flanagan, M Kamiya, LE Lees, CJ Murren, M Nakaoka, SJ Shainker, AE Strand, R Terada, M Valero, F Weinberger, SA Krueger-Hadfield (2018). Rapid evolution of tolerance for abiotic stress facilitates an introduced seaweed. Evolutionary Applications 11: 781-793.
  • Bippus PM, SA Krueger-Hadfield, EE Sotka (2018). Generalist herbivore species differentially respond to an introduced seaweed: the case of Gracilaria vermiculophylla. Marine Biology 165: 39.

Academic Distinctions and Professional Societies

Professional societies:

  • British Phycological Society
  • Phycological Society of America
  • Society for the Study of Evolution

Academic Distinctions: