Assessing relations among multiple environmental gradients for shallow lakes in Old Crow Flats, Yukon, using hydrological, limnological and community-collaborative research approaches
Shallow freshwater ecosystems are undergoing marked hydrological changes associated with a warming Arctic, which causes concern for remote northern communities that access these regions to maintain their traditional lifestyles. Variation in precipitation patterns (snow and rain), due to changing cli...
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University of Waterloo
2017
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ftunivwaterloo:oai:uwspace.uwaterloo.ca:10012/12824 2023-05-15T15:14:09+02:00 Assessing relations among multiple environmental gradients for shallow lakes in Old Crow Flats, Yukon, using hydrological, limnological and community-collaborative research approaches Balasubramaniam, Ann-Marie 2017-10-20 http://hdl.handle.net/10012/12824 en eng University of Waterloo http://hdl.handle.net/10012/12824 Thermokarst Lakes Community Collaborative Research Subarctic Hydrology Limnology Old Crow Flats Doctoral Thesis 2017 ftunivwaterloo 2022-06-18T23:01:40Z Shallow freshwater ecosystems are undergoing marked hydrological changes associated with a warming Arctic, which causes concern for remote northern communities that access these regions to maintain their traditional lifestyles. Variation in precipitation patterns (snow and rain), due to changing climate conditions has been found to strongly influence lake water balances. However, knowledge of how such changes in precipitation affect limnology and biotic community structure within lakes is lacking. Working collaboratively with the Vuntut Gwitchin First Nation (VGFN), this thesis examines the influence of hydrology on the limnology of shallow lakes in the Old Crow Flats, Yukon. Relations among source-water composition (snow vs. rain), catchment characteristics, limnology, and sediment properties are assessed and their influence on benthic biota are quantified. Results from 56 lakes, sampled during the early, mid-, and late ice-free season of 2007, identify that catchment mediated differences in source waters (snowmelt-dominated, intermediate and rainfall –dominated) are associated with different limnological characteristics and divergent seasonal trajectories. Snowmelt-dominated lakes, which occur in catchments with tall shrubs and trees, have significantly higher concentrations of dissolved phosphorus and organic carbon, relative to the other categories. These lakes exhibit the least amount of seasonal variation in water chemistry variables. In contrast, rainfall-dominated lakes, which are located in catchments with dwarf shrub and sparse vegetation, have significantly higher concentrations of major ions and higher pH. The rainfall-dominated lakes experience the greatest amount of seasonal variation in water chemistry and tend to be more similar to intermediate lakes in mid- and late-season. Interestingly, seasonal analysis of intermediate lakes highlights sensitivity of these lakes to transitioning sources of input water. As the ice-free season progresses, the water chemistry of intermediate lakes changes from ... Doctoral or Postdoctoral Thesis Arctic Gwitchin Old Crow Subarctic Thermokarst Yukon University of Waterloo, Canada: Institutional Repository Arctic Yukon Old Crow Flats ENVELOPE(-139.755,-139.755,68.083,68.083) |
institution |
Open Polar |
collection |
University of Waterloo, Canada: Institutional Repository |
op_collection_id |
ftunivwaterloo |
language |
English |
topic |
Thermokarst Lakes Community Collaborative Research Subarctic Hydrology Limnology Old Crow Flats |
spellingShingle |
Thermokarst Lakes Community Collaborative Research Subarctic Hydrology Limnology Old Crow Flats Balasubramaniam, Ann-Marie Assessing relations among multiple environmental gradients for shallow lakes in Old Crow Flats, Yukon, using hydrological, limnological and community-collaborative research approaches |
topic_facet |
Thermokarst Lakes Community Collaborative Research Subarctic Hydrology Limnology Old Crow Flats |
description |
Shallow freshwater ecosystems are undergoing marked hydrological changes associated with a warming Arctic, which causes concern for remote northern communities that access these regions to maintain their traditional lifestyles. Variation in precipitation patterns (snow and rain), due to changing climate conditions has been found to strongly influence lake water balances. However, knowledge of how such changes in precipitation affect limnology and biotic community structure within lakes is lacking. Working collaboratively with the Vuntut Gwitchin First Nation (VGFN), this thesis examines the influence of hydrology on the limnology of shallow lakes in the Old Crow Flats, Yukon. Relations among source-water composition (snow vs. rain), catchment characteristics, limnology, and sediment properties are assessed and their influence on benthic biota are quantified. Results from 56 lakes, sampled during the early, mid-, and late ice-free season of 2007, identify that catchment mediated differences in source waters (snowmelt-dominated, intermediate and rainfall –dominated) are associated with different limnological characteristics and divergent seasonal trajectories. Snowmelt-dominated lakes, which occur in catchments with tall shrubs and trees, have significantly higher concentrations of dissolved phosphorus and organic carbon, relative to the other categories. These lakes exhibit the least amount of seasonal variation in water chemistry variables. In contrast, rainfall-dominated lakes, which are located in catchments with dwarf shrub and sparse vegetation, have significantly higher concentrations of major ions and higher pH. The rainfall-dominated lakes experience the greatest amount of seasonal variation in water chemistry and tend to be more similar to intermediate lakes in mid- and late-season. Interestingly, seasonal analysis of intermediate lakes highlights sensitivity of these lakes to transitioning sources of input water. As the ice-free season progresses, the water chemistry of intermediate lakes changes from ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Balasubramaniam, Ann-Marie |
author_facet |
Balasubramaniam, Ann-Marie |
author_sort |
Balasubramaniam, Ann-Marie |
title |
Assessing relations among multiple environmental gradients for shallow lakes in Old Crow Flats, Yukon, using hydrological, limnological and community-collaborative research approaches |
title_short |
Assessing relations among multiple environmental gradients for shallow lakes in Old Crow Flats, Yukon, using hydrological, limnological and community-collaborative research approaches |
title_full |
Assessing relations among multiple environmental gradients for shallow lakes in Old Crow Flats, Yukon, using hydrological, limnological and community-collaborative research approaches |
title_fullStr |
Assessing relations among multiple environmental gradients for shallow lakes in Old Crow Flats, Yukon, using hydrological, limnological and community-collaborative research approaches |
title_full_unstemmed |
Assessing relations among multiple environmental gradients for shallow lakes in Old Crow Flats, Yukon, using hydrological, limnological and community-collaborative research approaches |
title_sort |
assessing relations among multiple environmental gradients for shallow lakes in old crow flats, yukon, using hydrological, limnological and community-collaborative research approaches |
publisher |
University of Waterloo |
publishDate |
2017 |
url |
http://hdl.handle.net/10012/12824 |
long_lat |
ENVELOPE(-139.755,-139.755,68.083,68.083) |
geographic |
Arctic Yukon Old Crow Flats |
geographic_facet |
Arctic Yukon Old Crow Flats |
genre |
Arctic Gwitchin Old Crow Subarctic Thermokarst Yukon |
genre_facet |
Arctic Gwitchin Old Crow Subarctic Thermokarst Yukon |
op_relation |
http://hdl.handle.net/10012/12824 |
_version_ |
1766344644089610240 |