Paleo-Ecotoxicology of Yellowknife (Northwest Territories, Canada) Lakes Impacted by Historic Gold Mining Activities
This thesis explores the ecological impacts of legacy arsenic contamination on Cladocera (Branchiopoda, Crustacea) from historic gold mining in Yellowknife lakes (Northwest Territories, Canada) using a paleo-ecotoxicological approach. I examined Cladocera subfossils preserved in the modern and pre-1...
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ftyorkuniv:oai:yorkspace.library.yorku.ca:10315/37974 2023-05-15T15:04:17+02:00 Paleo-Ecotoxicology of Yellowknife (Northwest Territories, Canada) Lakes Impacted by Historic Gold Mining Activities Persaud, Ajay Arjoon Korosi, Jennifer 2020-11-13T13:58:48Z application/pdf http://hdl.handle.net/10315/37974 en eng http://hdl.handle.net/10315/37974 Author owns copyright, except where explicitly noted. Please contact the author directly with licensing requests. Physical geography Arsenic Limnology Paleo-ecotoxicology Zooplankton Legacy contaminants Arctic Electronic Thesis or Dissertation 2020 ftyorkuniv 2022-08-22T13:01:18Z This thesis explores the ecological impacts of legacy arsenic contamination on Cladocera (Branchiopoda, Crustacea) from historic gold mining in Yellowknife lakes (Northwest Territories, Canada) using a paleo-ecotoxicological approach. I examined Cladocera subfossils preserved in the modern and pre-1850 lake sediments of 23 lakes in the region, and the Daphnia resting egg bank of Pocket Lake, a highly contaminated lake in which striking ecological changes were previously recorded. Cladocera assemblage changes since pre-1850 were dependent on local, lake-specific limnological conditions. Littoral/benthic taxa dominated the cladoceran assemblage of the most contaminated lakes, while pelagic Bosmina were dominant in lakes with low arsenic. No viable Daphnia resting eggs were found in Pocket Lake, indicating that future resurrection ecology studies from Daphnia populations are not feasible. My research provides new information on the ecotoxicological effects of arsenic contamination in lake ecosystems, and the potential of using Cladocera as paleo-ecotoxicological indicators. Thesis Arctic Northwest Territories Yellowknife Zooplankton York University, Toronto: YorkSpace Arctic Canada Northwest Territories Yellowknife |
institution |
Open Polar |
collection |
York University, Toronto: YorkSpace |
op_collection_id |
ftyorkuniv |
language |
English |
topic |
Physical geography Arsenic Limnology Paleo-ecotoxicology Zooplankton Legacy contaminants Arctic |
spellingShingle |
Physical geography Arsenic Limnology Paleo-ecotoxicology Zooplankton Legacy contaminants Arctic Persaud, Ajay Arjoon Paleo-Ecotoxicology of Yellowknife (Northwest Territories, Canada) Lakes Impacted by Historic Gold Mining Activities |
topic_facet |
Physical geography Arsenic Limnology Paleo-ecotoxicology Zooplankton Legacy contaminants Arctic |
description |
This thesis explores the ecological impacts of legacy arsenic contamination on Cladocera (Branchiopoda, Crustacea) from historic gold mining in Yellowknife lakes (Northwest Territories, Canada) using a paleo-ecotoxicological approach. I examined Cladocera subfossils preserved in the modern and pre-1850 lake sediments of 23 lakes in the region, and the Daphnia resting egg bank of Pocket Lake, a highly contaminated lake in which striking ecological changes were previously recorded. Cladocera assemblage changes since pre-1850 were dependent on local, lake-specific limnological conditions. Littoral/benthic taxa dominated the cladoceran assemblage of the most contaminated lakes, while pelagic Bosmina were dominant in lakes with low arsenic. No viable Daphnia resting eggs were found in Pocket Lake, indicating that future resurrection ecology studies from Daphnia populations are not feasible. My research provides new information on the ecotoxicological effects of arsenic contamination in lake ecosystems, and the potential of using Cladocera as paleo-ecotoxicological indicators. |
author2 |
Korosi, Jennifer |
format |
Thesis |
author |
Persaud, Ajay Arjoon |
author_facet |
Persaud, Ajay Arjoon |
author_sort |
Persaud, Ajay Arjoon |
title |
Paleo-Ecotoxicology of Yellowknife (Northwest Territories, Canada) Lakes Impacted by Historic Gold Mining Activities |
title_short |
Paleo-Ecotoxicology of Yellowknife (Northwest Territories, Canada) Lakes Impacted by Historic Gold Mining Activities |
title_full |
Paleo-Ecotoxicology of Yellowknife (Northwest Territories, Canada) Lakes Impacted by Historic Gold Mining Activities |
title_fullStr |
Paleo-Ecotoxicology of Yellowknife (Northwest Territories, Canada) Lakes Impacted by Historic Gold Mining Activities |
title_full_unstemmed |
Paleo-Ecotoxicology of Yellowknife (Northwest Territories, Canada) Lakes Impacted by Historic Gold Mining Activities |
title_sort |
paleo-ecotoxicology of yellowknife (northwest territories, canada) lakes impacted by historic gold mining activities |
publishDate |
2020 |
url |
http://hdl.handle.net/10315/37974 |
geographic |
Arctic Canada Northwest Territories Yellowknife |
geographic_facet |
Arctic Canada Northwest Territories Yellowknife |
genre |
Arctic Northwest Territories Yellowknife Zooplankton |
genre_facet |
Arctic Northwest Territories Yellowknife Zooplankton |
op_relation |
http://hdl.handle.net/10315/37974 |
op_rights |
Author owns copyright, except where explicitly noted. Please contact the author directly with licensing requests. |
_version_ |
1766336081020583936 |