Holocene climate inferred from biological (Diptera: Chironomidae) analyses in a Southampton Island (Nunavut, Canada) lake
Concerns about the effects of global warming on Arctic environments have stimulated multidisciplinary research into the history of their long-term climatic and environmental variability to improve future predictions of climate in these remote areas. Here we present the first palaeolimnological study...
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crsagepubl:10.1177/0959683607086761 2023-05-15T15:00:58+02:00 Holocene climate inferred from biological (Diptera: Chironomidae) analyses in a Southampton Island (Nunavut, Canada) lake Rolland, Nicolas Larocque, Isabelle Francus, Pierre Pienitz, Reinhard Laperrière, Laurence 2008 http://dx.doi.org/10.1177/0959683607086761 http://journals.sagepub.com/doi/pdf/10.1177/0959683607086761 en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 18, issue 2, page 229-241 ISSN 0959-6836 1477-0911 Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change journal-article 2008 crsagepubl https://doi.org/10.1177/0959683607086761 2022-09-21T19:47:38Z Concerns about the effects of global warming on Arctic environments have stimulated multidisciplinary research into the history of their long-term climatic and environmental variability to improve future predictions of climate in these remote areas. Here we present the first palaeolimnological study for Southampton Island using analyses of chironomids supported by sedimentological analyses, carried out on a 1 m long core retrieved from a lake located in the northeastern part of the island. This core was made up of marine sediments underneath 65 cm of freshwater lake sediments. A marine shell, humic-acids and chironomid head capsules were used to date this sequence. The Holocene environmental history of the lake consisted of two major contrasting periods. The first one, between about 5570 and 4360 cal. yr BP, was climatically unstable, with common postglacial chironomid taxa such as Corynocera oliveri-type, Paracladius and Microspectra radialis-type. This period also corresponded to the highest chironomid-inferred August air temperature (10°C) for the whole record and to significant increases in major chemical elements as detected by x-ray fluorescence. During the second period, which lasted from about 3570 cal. yr BP until the present, limnological conditions seemed to stabilize after a change to cold oligotrophic chironomid taxa, such as Heterotrissocladius subpilosus-group, with no major variations in the abundance of chemical elements. Inferred August air temperatures ranged between 8 and 9°C. This study provided unique information on the timing of the Holocene Thermal Maximum in the Foxe Basin area, a region with very little information available on long-term climate change. This region showed, so far, relatively few signs of recent climatic change, as opposed to other regions in the High Arctic. Article in Journal/Newspaper Arctic Climate change Foxe Basin Global warming Nunavut Southampton Island SAGE Publications (via Crossref) Arctic Canada Foxe Basin ENVELOPE(-77.918,-77.918,65.931,65.931) Nunavut Southampton Island ENVELOPE(-84.501,-84.501,64.463,64.463) The Holocene 18 2 229 241 |
institution |
Open Polar |
collection |
SAGE Publications (via Crossref) |
op_collection_id |
crsagepubl |
language |
English |
topic |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
spellingShingle |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change Rolland, Nicolas Larocque, Isabelle Francus, Pierre Pienitz, Reinhard Laperrière, Laurence Holocene climate inferred from biological (Diptera: Chironomidae) analyses in a Southampton Island (Nunavut, Canada) lake |
topic_facet |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
description |
Concerns about the effects of global warming on Arctic environments have stimulated multidisciplinary research into the history of their long-term climatic and environmental variability to improve future predictions of climate in these remote areas. Here we present the first palaeolimnological study for Southampton Island using analyses of chironomids supported by sedimentological analyses, carried out on a 1 m long core retrieved from a lake located in the northeastern part of the island. This core was made up of marine sediments underneath 65 cm of freshwater lake sediments. A marine shell, humic-acids and chironomid head capsules were used to date this sequence. The Holocene environmental history of the lake consisted of two major contrasting periods. The first one, between about 5570 and 4360 cal. yr BP, was climatically unstable, with common postglacial chironomid taxa such as Corynocera oliveri-type, Paracladius and Microspectra radialis-type. This period also corresponded to the highest chironomid-inferred August air temperature (10°C) for the whole record and to significant increases in major chemical elements as detected by x-ray fluorescence. During the second period, which lasted from about 3570 cal. yr BP until the present, limnological conditions seemed to stabilize after a change to cold oligotrophic chironomid taxa, such as Heterotrissocladius subpilosus-group, with no major variations in the abundance of chemical elements. Inferred August air temperatures ranged between 8 and 9°C. This study provided unique information on the timing of the Holocene Thermal Maximum in the Foxe Basin area, a region with very little information available on long-term climate change. This region showed, so far, relatively few signs of recent climatic change, as opposed to other regions in the High Arctic. |
format |
Article in Journal/Newspaper |
author |
Rolland, Nicolas Larocque, Isabelle Francus, Pierre Pienitz, Reinhard Laperrière, Laurence |
author_facet |
Rolland, Nicolas Larocque, Isabelle Francus, Pierre Pienitz, Reinhard Laperrière, Laurence |
author_sort |
Rolland, Nicolas |
title |
Holocene climate inferred from biological (Diptera: Chironomidae) analyses in a Southampton Island (Nunavut, Canada) lake |
title_short |
Holocene climate inferred from biological (Diptera: Chironomidae) analyses in a Southampton Island (Nunavut, Canada) lake |
title_full |
Holocene climate inferred from biological (Diptera: Chironomidae) analyses in a Southampton Island (Nunavut, Canada) lake |
title_fullStr |
Holocene climate inferred from biological (Diptera: Chironomidae) analyses in a Southampton Island (Nunavut, Canada) lake |
title_full_unstemmed |
Holocene climate inferred from biological (Diptera: Chironomidae) analyses in a Southampton Island (Nunavut, Canada) lake |
title_sort |
holocene climate inferred from biological (diptera: chironomidae) analyses in a southampton island (nunavut, canada) lake |
publisher |
SAGE Publications |
publishDate |
2008 |
url |
http://dx.doi.org/10.1177/0959683607086761 http://journals.sagepub.com/doi/pdf/10.1177/0959683607086761 |
long_lat |
ENVELOPE(-77.918,-77.918,65.931,65.931) ENVELOPE(-84.501,-84.501,64.463,64.463) |
geographic |
Arctic Canada Foxe Basin Nunavut Southampton Island |
geographic_facet |
Arctic Canada Foxe Basin Nunavut Southampton Island |
genre |
Arctic Climate change Foxe Basin Global warming Nunavut Southampton Island |
genre_facet |
Arctic Climate change Foxe Basin Global warming Nunavut Southampton Island |
op_source |
The Holocene volume 18, issue 2, page 229-241 ISSN 0959-6836 1477-0911 |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/0959683607086761 |
container_title |
The Holocene |
container_volume |
18 |
container_issue |
2 |
container_start_page |
229 |
op_container_end_page |
241 |
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1766333013457633280 |