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Wilfrid Laurier University Faculty of Arts
September 30, 2014
 
 
Canadian Excellence
F12

Dr. Andrew Medeiros

Post-Doctoral Fellow

Contact Information
Email: amedeiros@wlu.ca
Phone: 519-884-0710 ext.3744
Fax: 519-725-1342
Office Location: 3E16
Office Hours: T 2-3pm
Academic Background

W. Garfield Weston Postdoctoral Fellow, 2012-2014 

PhD, York University, 2011.  

MES, York University, 2005. 

BSc, Hon. First Class, Brock University, 2003.

Biography

My research focuses on the use of biological and geochemical indicators to examine ecosystem responses to environmental change. My approach integrates the use of paleolimnology, which adds a temporal context, to contemporary biogeographic research on trophic system responses to disturbance. I have used this approach to model temperature warming in Arctic regions with the use of standard statistical modelling techniques in the R statistical package. This involves the development of calibration sets for determining environmental gradients using multi-variate statistics (e.g., canonical correspondence analysis), and functions for reconstructing environmental values from biological assemblages (e.g., weighted averaging partial least squares regression). My current research combines these approaches with the use of stable isotope geochemistry to examine biotic responses to coincident changes in temperature and nutrients in a hydroecological framework. My post-doctoral research to date has found significant relationships between the source and availability of nitrogen to biological communities in a warming environment; however, there remain numerous unexplained questions behind how carbon, nitrogen, methane, and organic matter interplay in Arctic environments that are warming. Understanding how these systems responded to past climatic change would answer significant questions as to how ecosystems will respond in the future.

Additional Information

Current Field Projects

  • Biogeochemistry of lakes in the Mackenzie River Delta experiencing permafrost disturbance, Inuvik, N.W.T., Canada.
  • Using geochemistry and chironomids to assess nutrient and trophic responses of Arctic lakes to recent environmental change, Northern Manitoba, Canada.
  • Characterizing Hydro-limnological relationships in the Apex River watershed, Iqaluit, Nunavut.
  • Examining the effects of catchment disturbance on nutrients and biological communities, Seward Peninsula, Alaska. 
  • Assessment of biological responses to contaminants in Arctic streams, Iqaluit, Nunavut.

Courses:

GG354 The Canadian North 

GG381 Hydrology 

BI496  Conservation Biology 

Current students:

· Anthony Todd. In Progress. Examining the effect of thaw polygons as conduits for the transport of nutrients to lakes, Inuvik, NWT. BES Honours Thesis (Geography & Environmental Studies, WLU).

· Jessica F. Peters. In Progress. Characterizing Hydro-limnological relationships in the Apex River watershed, Iqaluit, Nunavut. BES Co-Op Honours Thesis (Geography & Environmental Studies, WLU).

Former students:

· Heather Haight. 2013. Reconstructing nutrient responses to recent environmental change in lakes of the western Hudson Bay treeline region using lake sediment cores. BES Honours Thesis (Geography & Environmental Studies, WLU).

· Madeline Couse. 2013. Responses of diatom assemblages to disturbances in the catchments of Arctic lakes, Seward Peninsula, Alaska. BES Honours Thesis (Biology, University of Waterloo).

Publications

Refereed Articles

  • Bouchard F, Turner KW, MacDonald LA, Deakin C, White H, Farquharson N, Medeiros AS, Wolfe BB, Hall RI, Pienitz R, and Edwards TWD. 2013. Vulnerability of shallow subarctic lakes to evaporate and desiccate when snowmelt runoff is low. Geophysical Research Letters, 40(23):6112-6117.  
  • Medeiros AS, Friel CE, Finkelstein SA, and Quinlan R. 2012. A high resolution multi-proxy record of pronounced recent environmental change at Baker Lake, Nunavut. Journal of Paleolimnology, 47(4):661-676.  
  • Medeiros AS, Biastoch RG, Luszczek CE, Wang XA, Muir DGC, and Quinlan R. 2012. Patterns in the limnology of lakes and ponds across multiple local and regional environmental gradients in the eastern Canadian Arctic. Inland Waters (J Int Soc Limnol), 2(1):59-76. 
  • Medeiros AS and Drezner TD. 2012. Vegetation, Climate, and Soil Relationships across the Sonoran Desert. Écoscience, 19(2):148-160. 
  • Medeiros AS. 2012. Review: Changing cold environments, a Canadian perspective. Can Geog, 56(4):e7-e8. 
  • Medeiros AS, Luszczek CE, Shirley J, and Quinlan R. 2011. Benthic biomonitoring in Arctic tundra streams; a community based approach. Arctic, 64(1):59-72.
  • Medeiros AS and Quinlan R. 2011. The distribution of the Chironomidae (Insecta: Diptera) along multiple environmental gradients in lakes and ponds of the eastern Canadian Arctic. Can J Fish and Aquat Sci, 68(9):1511-1527. 
  • Medeiros AS and Molot L. 2006. Iron loading to Lake Ontario from Wastewater Treatment Plants in Toronto and Hamilton. J Great Lakes Res, 32(4):788-797.

 Non-refereed articles and technical reports

  • Medeiros AS, Shirley J, and Quinlan R. 2008. Impacts to the invertebrate community structure of aquatic systems in Nunavut: Stream benthos project. Newsletter of the Biological Survey of Canada, 27(1): 24-27.
  • Medeiros AS. 2006. Invertebrate Community Structure in Lakes of the Central Canadian Arctic. Newsletter of the Biological Survey of Canada, 25(2): 61-63. 
  • Molot L, Medeiros AS, and Fahnenstiel G. 2006. Western Lake Erie / Saginaw Bay HABS Cruise Report – Iron and Cyanobacteria Patterns, Technical Report to National Oceanic & Atmospheric Association – (GLERL), June 12, 2006. 

Conference Presentations

  • Medeiros, A.S., Taylor, D.J., Hall, R.I., Quinlan, R., and Wolfe, B.B. Examining the effect of catchment disturbance on nutrients and biological communities of Arctic lakes (Seward peninsula, Alaska). ArcticNet Annual Conference, Vancouver, BC, Oct 15, 2012.
  • Medeiros, A.S., Taylor, D.J., Quinlan, R., and Wolfe, B.B. Using geochemistry and chironomids to assess trophic responses of Alaskan lakes to recent environmental change. International Paleolimnology Symposium, Glasgow, UK, Aug 24, 2012.
  • Medeiros, A.S., Quinlan, R., and Wolfe, B.B. Using geochemistry to assess relationships between nutrients and chironomid assemblages. PALS Paleolimnology Student Conference (regional), Western University, London, ON, May 23-26, 2012.
  • Medeiros, A.S. and Quinlan, R. A Chironomidae-based stratigraphic record of pronounced 20th century warming in a large, deep, Canadian Arctic lake. 18th annual symposium of the Chironomidae, Trondheim, Norway, July 4-6, 2011. 
  • Medeiros, A.S. and Quinlan, R. The development of a Chironomid based paleo-environmental model for the eastern Canadian Arctic. Annual workshop of the Chironomidae, Finse, Norway, June 29-July 2, 2011. 
  • Medeiros, A.S. and Quinlan, R. A high resolution record of pronounced 20th century environmental change at Baker Lake, Nunavut. PALS Paleolimnology Graduate Student Conference, McGill University, Montreal, QC, May 25-27, 2011. 
  • Medeiros, A.S. and Quinlan, R. Shifts in the aquatic midge community of Baker Lake, Nunavut; An indicator of pronounced 20th century environmental change. 64th Canadian Conference for Fisheries Research, Toronto, ON, January 7-8, 2011. 
  • Medeiros, A.S. and Quinlan, R. The biogeographic distribution of Chironomidae (Insecta:Diptera) from northern Manitoba to the eastern Canadian Arctic. Association of American Geographers (AAG), Annual Conference, Washington, DC, April 15, 2010. 
  • Medeiros, A.S. and Quinlan, R. Dynamics of thermal stratification in two small Arctic lakes, Nunavut territory, Canada. Canadian Hydrological Union, York University, October 15, 2009
  • Medeiros, A.S. and Quinlan, R. A Biogeographic examination of Arctic aquatic systems. Society of International Limnology 50th Congress, Montreal, QC, August 15, 2007. 
  • Medeiros, A.S. and Quinlan, R. Biostratigraphic examination of Chaoborus distributions in the Canadian Arctic. Canadian Quaternary Association, University of Ottawa, June 5, 2007. 
  • Medeiros, A.S. and Quinlan, R. The distribution of past and present aquatic invertebrate communities across Nunavut. PALS Paleolimnology Graduate Student Conference, University of Waterloo, Waterloo, ON, April 20, 2007. 
  • Medeiros, A.S. A Biogeographic examination of climate driven impacts on lakes and ponds of the Canadian Arctic. A.D.Latornell Conservation Symposium, Alliston, ON, Nov 16, 2006. 
  • Medeiros, A.S. Quinlan R., & Remmel, T. The use of Remote Sensing for change detection and directed site selection for sampling of Arctic lakes and ponds. Canadian Association of Geographers, McMaster University, Hamilton, ON, Oct 14, 2006.