My fields of research include conservation, aquatic ecology and the impacts of human disturbance on ecosystem functioning. I'm particularly interested in the cumulative effects of anthropogenic stressors on aquatic ecosystems and developing our ability to manage biodiversity and sea- and land-use decisions in sustainable and just ways.
I earned my BSc at the University of British Columbia in biology and oceanography, and my MSc in biology at McGill University.
Impacts of invasive crayfish depend on the population source and the presence of competitors
Photos by Raina Fan
A research project as part of my MSc focused on identifying factors that can lead to the context-dependence of invasive species' impacts. I used crayfishes as model organisms and functional response experiments to measure per capita effects as a proxy for field impacts. I was curious about how impacts might differ between geographically-disparate populations of a species. To figure it out, my collaborators and I compared the feeding behaviour of American spiny-cheek crayfish from populations in its native and invaded ranges in Canada, the USA, Germany and Belgium to use in laboratory experiments.
To import the crayfish used in my experiments, I created a AQC-2 small-scale containment facility at McGill University, which was inspected and approved by the Canadian Food Inspection Agency. This innovation was necessary because most North American crayfish species are potential carriers of Aphanomyces astaci, a water mold that causes crayfish plague, a disease fatal to European crayfishes. To limit the potential spread of crayfish plague, import of American spiny-cheek crayfish into Canada is highly regulated, and for research use, requires a safe quarantine facility.
Ray, J.C., J. Grimm, & A. Olive. 2021. The biodiversity crisis in Canada: failures and challenges of federal and sub-national legal frameworks. FACETS. doi:10.1139/facets-2020-0075
Grimm, J., J.T.A. Dick, H. Verreycken, J. Jeschke, S. Linzmaier & A. Ricciardi. 2020. Context-dependent differences in the functional responses of conspecific native and non-native crayfishes. NeoBiota 54: 71–88. doi:10.3897/neobiota.54.38668
Hersh, E., J. Grimm & J. Whitton. 2016. Attack of the Clones: reproductive interference between sexuals and asexuals in the Crepis agamic complex. Ecology and Evolution 6(18): 6473–6483. doi:10.1002/ece3.2353
Grimm, J. & C. Raudsepp-Hearne. 2021. International Association for Great Lakes Research Annual Conference, On-line. Invited Talk: Key Biodiversity Areas to focus biodiversity conservation in Canada
Grimm, J., J.T.A. Dick, H. Verreycken, J. Jeschke, S. Linzmaier & A. Ricciardi. 2019. International Conference on Aquatic Invasive Species, Montréal. Poster: Context-dependent differences in the functional responses of conspecific native and non-native crayfishes
Grimm, J. & A. Ricciardi. 2017. Canadian Conference for Fisheries Research, Montréal. Talk: Predicting invasive crayfish impacts using functional responses
Grimm, J. & A. Ricciardi. 2016. Quebec Centre for Biodiversity Science Research Symposium, Montréal. Talk: Predicting invasive crayfish impacts using functional responses
Grimm, J. & A. Ricciardi. 2016. International Conference on Aquatic Invasive Species, Winnipeg. Poster: Crayfishes as a model system for invasions