Chironomid-environment relations in northern North America
Chironomid assemblages from the uppermost sediments of 435 lakes spanning northern North America were compared to environmental parameters using direct gradient analysis. This large calibration set was merged from several previously developed regional datasets, and increases the number of modern ana...
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Canadian Cryospheric Information Network
2015
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ftdatacite:10.21963/12504 2023-05-15T15:00:34+02:00 Chironomid-environment relations in northern North America Medeiros, Andrew Gajewski, Konrad Barley, Erin Fortin, Marie-Claude Larocque-Tobler, Isabelle Porinchu, David Wilson, Sue 2015 https://dx.doi.org/10.21963/12504 https://www.polardata.ca/pdcsearch/?doi_id=12504 en eng Canadian Cryospheric Information Network Public Chironomids Climatic models Diversity Lake sediments Water chemistry Other programs and funding agencies dataset Dataset 2015 ftdatacite https://doi.org/10.21963/12504 2021-11-05T12:55:41Z Chironomid assemblages from the uppermost sediments of 435 lakes spanning northern North America were compared to environmental parameters using direct gradient analysis. This large calibration set was merged from several previously developed regional datasets, and increases the number of modern analogues that are available for use for paleoenvironmental interpretations in this region. Air temperature explained the largest amount of variation in the chironomid assemblages with several other environmental factors accounting for statistical significant amounts of the remaining variance. A robust inference model for deriving past mean July air temperatures from subfossil chironomid assemblages was developed and applied to previously-published paleoclimate reconstructions from the High-Arctic, Middle-Arctic, Boreal treeline, and Alpine regions of northern North America. The patterns of the temperature reconstructions from the combined dataset were generally similar to the original reconstructions, but with colder inferred temperatures reflecting the incorporation of a larger number of modern sites from colder climates in the combined dataset. This analysis demonstrated that the larger temperature gradient available in the new training set, when compared to the temperature gradients in the original training sets, provides a better estimation of chironomid-environment relationships. In particular, the optima and tolerances estimated using the larger, combined dataset should be more accurate, and therefore, improve midge-based paleoclimate reconstructions for northern North America. Despite the much larger spatial scale and greater associated environmental heterogeneity now incorporated in the combined dataset, this study suggests that in most cases the overarching constraint governing chironomid distributions in northern North America is temperature. : Purpose: To examine chironomid (Insecta:Diptera:Chironomidae) diversity in relation to environmental parameters from 435 lakes across northern North America. : Summary: Diversity of chironomid assemblages compared to water chemistry from 435 lakes across northern North America. Dataset Arctic DataCite Metadata Store (German National Library of Science and Technology) Arctic |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Chironomids Climatic models Diversity Lake sediments Water chemistry Other programs and funding agencies |
spellingShingle |
Chironomids Climatic models Diversity Lake sediments Water chemistry Other programs and funding agencies Medeiros, Andrew Gajewski, Konrad Barley, Erin Fortin, Marie-Claude Larocque-Tobler, Isabelle Porinchu, David Wilson, Sue Chironomid-environment relations in northern North America |
topic_facet |
Chironomids Climatic models Diversity Lake sediments Water chemistry Other programs and funding agencies |
description |
Chironomid assemblages from the uppermost sediments of 435 lakes spanning northern North America were compared to environmental parameters using direct gradient analysis. This large calibration set was merged from several previously developed regional datasets, and increases the number of modern analogues that are available for use for paleoenvironmental interpretations in this region. Air temperature explained the largest amount of variation in the chironomid assemblages with several other environmental factors accounting for statistical significant amounts of the remaining variance. A robust inference model for deriving past mean July air temperatures from subfossil chironomid assemblages was developed and applied to previously-published paleoclimate reconstructions from the High-Arctic, Middle-Arctic, Boreal treeline, and Alpine regions of northern North America. The patterns of the temperature reconstructions from the combined dataset were generally similar to the original reconstructions, but with colder inferred temperatures reflecting the incorporation of a larger number of modern sites from colder climates in the combined dataset. This analysis demonstrated that the larger temperature gradient available in the new training set, when compared to the temperature gradients in the original training sets, provides a better estimation of chironomid-environment relationships. In particular, the optima and tolerances estimated using the larger, combined dataset should be more accurate, and therefore, improve midge-based paleoclimate reconstructions for northern North America. Despite the much larger spatial scale and greater associated environmental heterogeneity now incorporated in the combined dataset, this study suggests that in most cases the overarching constraint governing chironomid distributions in northern North America is temperature. : Purpose: To examine chironomid (Insecta:Diptera:Chironomidae) diversity in relation to environmental parameters from 435 lakes across northern North America. : Summary: Diversity of chironomid assemblages compared to water chemistry from 435 lakes across northern North America. |
format |
Dataset |
author |
Medeiros, Andrew Gajewski, Konrad Barley, Erin Fortin, Marie-Claude Larocque-Tobler, Isabelle Porinchu, David Wilson, Sue |
author_facet |
Medeiros, Andrew Gajewski, Konrad Barley, Erin Fortin, Marie-Claude Larocque-Tobler, Isabelle Porinchu, David Wilson, Sue |
author_sort |
Medeiros, Andrew |
title |
Chironomid-environment relations in northern North America |
title_short |
Chironomid-environment relations in northern North America |
title_full |
Chironomid-environment relations in northern North America |
title_fullStr |
Chironomid-environment relations in northern North America |
title_full_unstemmed |
Chironomid-environment relations in northern North America |
title_sort |
chironomid-environment relations in northern north america |
publisher |
Canadian Cryospheric Information Network |
publishDate |
2015 |
url |
https://dx.doi.org/10.21963/12504 https://www.polardata.ca/pdcsearch/?doi_id=12504 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_rights |
Public |
op_doi |
https://doi.org/10.21963/12504 |
_version_ |
1766332652519948288 |