Postdoctoral Fellows

Ali Ameli
Supervisor: Jeff McDonnell
Melkamu AliNHRC
NHRC 1114

Research Interests

Willemijn AppelsNHRC
(306) 966-8405

Jeff McDonnell

Willemjin completed her PhD at Wageningen University in the Netherlands. Her thesis involved research on surface runoff in flat agricultural catchments throughout the Netherlands. 

Kwok (Sun) ChunNHRC
(306) 966-8639

Howard Wheater

Kwok P. Chun (Sun) has a first class degree from the University of Hong Kong and holds a PhD and MSc in Environmental Engineering with distinction from Imperial College London. Before joining the CERC program, Sun worked for consultants Arup and the Hong Kong Polytechnic University.  

Chun’s research interests are in statistical downscaling of climate scenarios for the assessment of nonstationary hydrological characteristics, including flood and drought. As the future hydrological cycle is uncertain under anthropogenic influence, Sun’s current projects will qualify and quantify risks, extremes and irreversible change related to natural processes in Canada and other parts of the world.

Research Interests

Hydrology; statistics; climate change

Supervisors: Karl-Erich Lindenschmidt and Howard Wheater
José-Luis GuerreroNHRC
(306) 966-7243

Howard Wheater
Jose-Luis is a Civil Engineer from Honduras who moved to Sweden to complete his PhD in hydrology at Uppsala University. His research has dealt with uncertainty in environmental modeling, focusing on discharge and precipitation, and robust water-balance modeling. Jose-Luis' current research deals with applying tools from computational geometry, with links to non-parametric multivariate statistical analysis, to model calibration and evaluation. Computational methods are new to hydrology and present many potential applications, e.g., assessing model-structural uncertainty.
Amin HaghnegahdarNHRC
NHRC 1114
Supervisors: Saman Razavi and Howard Wheater
Daryl JanzenNHRC
(306) 966-1558

Andrew Ireson
Daryl is investigating groundwater processes in Marmot Basin, under the supervision of Andrew Ireson. He became a postdoctoral fellow with the Global Institute for Water Security after studying physics at the University of Saskatchewan (BSc in Mathematical Physics, 2004; MSc in Physics, 2008; PhD in Physics, 2012). Previous work was with Prof. Jeffrey McDonnell on a description of subsurface stormflow using directed percolation theory. Daryl is generally interested in the conceptualisation and modelling of physical processes.
Dawn KeimNHRC
NHRC 1010.4

Research Interests

Michael KehoeNHRC
(306) 966-7226
NHRC 1115

Chen LiangNHRC
(306) 966-6661
NHRC 1265

Natalie OrlowskiNHRC
(306) 966-7226
NHRC 1115

Taufique MahmoodNHRC
(306) 966-2634

John Pomeroy,
Howard Wheater
Taufique joined in the Global Institute of Water Security in June, 2012. He has a PhD in Geological Science (Hydrology) from Arizona State University, an M.Sc. in Engineering Science (Geology) from the University of Mississippi and a BSc and MSc in Geology from the University of Dhaka. Taufique's current postdoctoral research interests are in cold region hydrologic processes and nutrient transports in the Canadian prairies, uncertainties in cold region processes simulations, and finally impacts of land use changes on hydrologic responses. He also had previous research experiences in mountain ecohydrology in the southern Rockies, distributed hydrologic modeling and model development, development of spatial indices as indicators to dominant land surface processes, calibration of satellite imagery, spatial analyses, image processing, and finally geological mapping using both field based and remotely sensed data.
(306) 966-4149

Chrystal Mantyka-Pringle is an Applied Ecologist and Conservation Scientist who specializes on understanding the impacts and interactions of climate change and land-use change on biodiversity and translating the implications of global change into conservation planning. Chrystal achieved a Bachelor of Science with First Class Honours in Marine Biology from James Cook University in Australia. Later she received a PhD in Conservation Biology from the University of Queensland in Australia on the topic of decision making for conserving biodiversity in the face of climate change and land-use change. Chrystal has worked for the Australian Government Department of Environment and Resource Management and the Commonwealth Scientific and Industrial Research Organization (CSIRO) as a Research Projects Officer focused on maintaining and managing water quality and aquatic ecosystem health and minimizing the risk of infestation of invasive species. Chrystal has now joined the U of S and the Global Institute for Water Security in 2014 as a post-doctoral research fellow to develop a decision theory model for examining environmental change in the Canadian River deltas.    

Chrystal’s research interests include:

  • Understanding the interactions between multiple stressors on patterns and processes shaping biodiversity and ecosystem services
  • Bridging science and traditional knowledge for conservation design and planning
  • Identifying spatial priorities for conservation actions, particularly restoration ecology at local, regional and global scales
  • Using expert knowledge and empirical data to make good and adaptive conservation planning decisions
  • Investigating the role of collaboration in conservation, particularly the links between scientists, practitioners,  managers, policy makers and the public in achieving defensible science-based conservation and environment decisions  

Chrystal is an associate member of the Conservation Decisions Team with the CSIRO Ecosystem Sciences in Brisbane, Australia ( She is also a research affiliate with the ARC Centre of Excellence for Environmental Decisions ( and the National Environment Research Program’s Research Hub for Environmental Decisions. These are multi-disciplinary groups with expertise in ecology, systematic conservation planning, priority threat management, artificial intelligence, and decision theory.

Select Publications:

Mantyka-Pringle CS, Westman, CN, Kythreotis AP, & Schindler DW. (in press) Honoring Indigenous Treaty Rights in Canada for Climate Justice. Nature Climate Change

Mantyka-Pringle C, Visconti P, Marco MD, Martin T, Rondinini C & Rhodes JR. (2015) Climate Change Modifies Risk of Global Biodiversity Loss due to Land-Cover Change. Biological Conservation 187:103-111

Mantyka-Pringle C, Kythreotis AP. (2014) Climate policy: Translating public action into policy. Nature 514(7524): 567-567

Mantyka-Pringle, C.S., T.G. Martin, D.B. Moffatt, S. Linke, and J.R. Rhodes. (2014) Understanding and Predicting the Combined Effects of Climate Change and Land-Use Change on Freshwater Macroinvertebrates and Fish. Journal of Applied Ecology 51(3) 572-581

Guisan A, Naujokaitis-Lewis I, Mantyka-Pringle C, Possingham HP & Buckley YM et al. (2013) Predicting species distributions for conservation decisions. Ecology Letters 16(12): 1424-1435

Mantyka-Pringle C. (2013) Decision making for conserving biodiversity under climate change and land-cover change. Australian Wildlife Magazine Spring(4)

Mantyka-Pringle C, Martin TG & Rhodes JR. (2012) Interactions between climate and habitat loss effects on biodiversity: a systematic review and meta-analysis. Global Change Biology 18(4): 1239-1252

Mantyka C, Bellwood DR. (2007) Direct evaluation of macroalgal removal by herbivorous coral reef fishes. Coral Reefs 26(2): 435-442

Mantyka C, Bellwood DR (2007) Macroalgal selectivity among an herbivorous reef fish assemblage. Marine Ecology Progress Series 352:177-185

Luis Morales MarinNHRC
(306) 966-7243

Karl-Erich Lindenschmidt,
Howard Wheater

Luis studied Civil Engineering in the Colombian School of Engineering and obtained an MSc in Water Resources at the National University of Colombia in Bogota. After receiving a scholarship he pursued his PhD studies in Physical Geography at University College London (UCL), United Kingdom working on sediment transport and hydrodynamics modeling in lakes at the Coastal and Estuaries Research Unit (CERU).

Luis has worked for consulting companies in Colombia in the design and construction of hydraulic structures. His research is focused on the study and modelling of complex physical processes associated with hydrology and hydrodynamics in lakes, rivers and estuaries. He is particularly interested in the study of the hydrodynamics and its effects on erosion, transport and deposition of sediments and nutrients in catchments. His research also focuses on the understanding of the processes derived from the interaction between climate forcing and rainfall-runoff events.

Luis is currently working on water quality modelling in the South-Saskatchewan River Basin using the SPARROW model under the supervision of Drs. Karl-Erich Lindenschmidt and Howard Wheater.

Vanessa PedinottiNHRC
(306) 966-7226
NHRC 1115

Patricia PernicaNHRC
(306) 966-2455
NHRC 1010.4


  • BASc, MSc, PhD

Supervisors: Howard Wheater, U of S, and Murray MacKay, Environment Canada

Patricia received a BASc in Mechanical Engineering from the University of Toronto and a MSc. in Mechanical Engineering from the University of Alberta.  In 2013 she completed a PhD in Physics from the University of Toronto. Her dissertation focused on characterizing physical processes in the surface layer of lakes and analyzing their effects on mixing and transport of nutrients and aquatic organisms.  

Patricia's research interests are focused on understanding the role of lakes in regional climate systems through identifying and modeling key physical processes. Lakes can influence local and regional climate as they have significantly different radiative and thermal properties compared with soil or vegetated surfaces. Incorporating a lake model into a regional climate model is necessary to understand the influence of lake systems on atmospheric processes.    

Recent publications:

Pernica, P., Wells, M.G., Sprules, W.G. 2013. Internal waves and mixing in the epilimnion of a lake affects spatial patterns of zooplankton in a body-size dependent manner. Limnology and Oceanography: Fluids and Environments, 3: 279-294, DOI:10.1215/21573689-2409149.

Pernica, P., Wells, M.G., MacIntyre, S. 2013, Persistent weak thermal stratification inhibits mixing in the epilimnion of north-temperate Lake Opeongo, Canada.  Aquatic Sciences.  DOI: 10.1007/s00027-013-0328-1.

Pernica, P., Wells, M.G. 2012. Frequency of episodic stratification in the near surface of Lake Opeongo and other small lakes.  Water Quality Research Journal of Canada. 47(3-4): 227-237. DOI: 10.2166/wqrjc.2012.001


Research Interests

Lake-atmosphere interaction, physical limnology, modelling, mixing dynamics

Song TangToxicology
Toxicology Centre
Supervisor: Markus Hecker
Omer YetemanNHRC
(306) 966-6661
NHRC 1265