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Evidence for a warmer period during the 12th and 13th centuries AD from chironomid assemblages in Southampton Island, Nunavut, Canada

Published online by Cambridge University Press:  20 January 2017

Nicolas Rolland*
Affiliation:
Institut National de la Recherche Scientifique (INRS): Eau, Terre et Environnement (ETE), 490 de la Couronne, Québec (Qc), Canada G1K 9A9 Centre d'Études Nordiques, Laboratoire de Paléoécologie Aquatique, Université Laval, Québec (Qc), Canada G1V 0A6
Isabelle Larocque
Affiliation:
Institut National de la Recherche Scientifique (INRS): Eau, Terre et Environnement (ETE), 490 de la Couronne, Québec (Qc), Canada G1K 9A9 Oeschger Center, Institute of Geography, University of Bern, Zähringerstrasse 25, CH 3013 Bern, Switzerland
Pierre Francus
Affiliation:
Institut National de la Recherche Scientifique (INRS): Eau, Terre et Environnement (ETE), 490 de la Couronne, Québec (Qc), Canada G1K 9A9 Centre d'Études Nordiques, Laboratoire de Paléoécologie Aquatique, Université Laval, Québec (Qc), Canada G1V 0A6
Reinhard Pienitz
Affiliation:
Centre d'Études Nordiques, Laboratoire de Paléoécologie Aquatique, Université Laval, Québec (Qc), Canada G1V 0A6
Laurence Laperrière
Affiliation:
Centre d'Études Nordiques, Laboratoire de Paléoécologie Aquatique, Université Laval, Québec (Qc), Canada G1V 0A6
*
Corresponding author. Centre d'Études Nordiques, Laboratoire de Paléoécologie Aquatique, Université Laval, Pavillon Abitibi-Price, local 1206, Québec, Qc, G1V 0A6, Canada.

E-mail address: [email protected] (N. Rolland)

Abstract

This study presents the Late-Holocene evolution of a northern Southampton Island (Nunavut, Canada) lake, using fossil chironomids supported by sedimentological evidences (XRF, grain size and CNS). All proxies revealed a relatively stable environment during the last millennium with short-lived events driving changes in the entire lake ecosystem. The chironomid-based paleotemperatures revealed variations of significant amplitude coincident with changes in the sediment density and chemical composition of the core. Higher temperature intervals were generally correlated to lower sediment density with higher chironomid concentration and diversity. Higher temperatures were recorded from cal yr AD 1160 to AD 1360, which may correspond to the Medieval Warm Period. Between cal yr AD 1360 and AD 1700, lower temperatures were probably related to a Little Ice Age event. This study presents new information on the timing of known climatic events which will refine our knowledge of the paleoclimate and climatic models of the Foxe Basin region. It also provides a new framework for the evolution of such freshwater ecosystems under the “Anthropocene” and underlines the importance of including sedimentological proxies when interpreting chironomid remains as this combined approach provides an extended overview of the past hydrological and geochemical changes and their impacts on lake biota.

Type
Research Article
Copyright
University of Washington

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