15 record(s) found with the tag "food web" (multi-year projects are grouped):
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The Bio- Magnification of Mercury within Fish Species of the Deh Cho and Their Varying Levels Among Lakes
Principal Investigator: Swanson, Heidi
Licenced Year(s): 2016 2016 2015 2014 2013
Summary: The objectives of this research project are to: 1) determine why fish mercury levels vary among lakes in the Dehcho region; 2) identify best predictors of fish mercury levels; and, 3) determine which fish have the lowest levels of mercury and highest levels of micro-nutrients and fatty acids. The methods for this project include two parts, first is the collection of food web data from each lake...


Noell Lake Ice Study - Hydro-ecological Responses of Arctic Tundra Lakes to Climate Change and Landscape Perturbation
Principal Investigator: Wrona, Frederick J
Licenced Year(s): 2015 2014 2013 2012 2011 2010 2009
Summary: The overall objective of this research is to improve the knowledge on lake ice and its effect on food webs/productivity in small Arctic lake systems in order to better predict changes that could occur under changing climate. The research involves the automated ice buoy and instrumented subsurface mooring system for continuous monitoring of weather conditions, lake ice cover (formation, growth o...


ArcticNet: an Integrated Regional Impact Study of the Coastal Western Canadian Arctic.
Principal Investigator: Fortier, Martin
Licenced Year(s): 2013 2012 2011 2010 2009 2007 2006 2005 2004
Summary: The central aim of the ArcticNet marine-based research program is to study on a long-term basis how climate induced changes are impacting the marine ecosystem, contaminant transport, biogeochemical fluxes, and exchange processes across the ocean-sea ice-atmosphere interface in the Canadian Arctic Ocean. Ultimately, the knowledge generated from this multi-year program will be integrated into regio...


Effect of spring and summer temperatures on amphipod reproduction (Gammarus lacustris)
Principal Investigator: Messmer, David J
Licenced Year(s): 2012
Summary: To determine how spring and summer temperatures affect the abundance of the amphipod Gammarus lacustris throughout the summer. Over the 2 years of the experiment, the research team plans to use amphipods from 4 different sources over several latitudes (Montana-USA, St. Denis-SK, Yellowknife-NT, Inuvik, NT). Using this variety of geographic sources will allow us to assess if different populations...


Evaluation of hydro-climatic drivers of contaminant transfer in aquatic food webs in the Husky Lakes Watershed (Inuvialuit Settlement Region, NWT)
Principal Investigator: Gantner, Nikolaus (Klaus)
Licenced Year(s): 2013 2012 2011
Summary: The long term goals of this research are: 1. to identify and quantify the physical, chemical and ecological processes that affect contaminant transfer in Arctic aquatic food webs in response to observed and predicted climate variability & change in the Husky Lakes Watershed (HLW); and 2. to provide people and regulators of Inuvik and Tuktoyaktuk with tools to effectively monitor selected highly...


Amendment - Hydro-ecological Responses of Arctic Tundra Lakes to Climate Change and Landscape Perturbation
Principal Investigator: Wrona, Frederick J
Licenced Year(s): 2011 2010 2009
Summary: The overall objective of this research is to improve our knowledge on present-day food webs/productivity in small Arctic pond/lake systems in order to better predict changes that could occur under changing climate. The methodology described below pertains to all research activities related to this research component dealing with fish. All other research activities related to this work were revi...


Enhanced Investigations of the Factors affecting Long-term Contaminant Trends in Predatory Fish in Great Slave Lake, Northwest Territories
Principal Investigator: Evans, Marlene
Licenced Year(s): 2010 2009
Summary: For several years, studies have been conducted to find out if contaminant levels are changing in lake trout and burbot in Great Slave Lake. The researchers have been seeing some changes with mercury levels increasing and HCH levels declining in these fish. However, there have been other changes in the fish, especially lake trout which appear to contain less fat and to be feeding closer to shore th...


Lake Trout Diversity and the Deepwater Food Web
Principal Investigator: Muir, Andrew M
Licenced Year(s): 2012 2010
Summary: The research objective is to provide baseline information on Lake Trout diversity within the proposed East Arm National Park The research goals are to sample Lake Trout from each of 3 depth ranges [0-50m, 50-100m, and >100m] at 10 sites in the East Arm, Great Slave Lake; to sample lower food web (i.e., Mysis, zooplankton, benthic invertebrates) from each of 3 depth ranges at two previously samp...


Biogeochemistry of Lakes in the Mackenzie Delta
Principal Investigator: Lesack, Lance
Licenced Year(s): 2016 2015 2014 2010 2009 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993
Summary: Specific activities for this field season include the following: (1) Resolution of the sources and fates of dissolved organic carbon (DOC) in aquatic food webs of the Mackenzie Delta (year 3 of PhD thesis project of S. Tank). This information is needed to ultimately understand the relative role of bacterial (fueled by DOC) versus photosynthetic organisms and their importance in ultimately sup...


Development of monitoring program for the Whooping Crane food sources in Wood Buffalo National Park
Principal Investigator: Classen, Claire M
Licenced Year(s): 2005
Summary: The last self-sustaining population of whooping cranes breeds in a vast wetland complex in northern Wood Buffalo National Park (WBNP), Canada. For the past fifty years, Canada and the United States have participated in successful conservation efforts to prevent the species’ extinction. However, the population of whooping cranes is still not large enough for the cranes to be de-listed from their ...


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