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Palaeoecological and palaeoclimatic conditions on the Karelian Isthmus (northwestern Russia) during the Holocene

Palaeoecological and palaeoclimatic conditions on the Karelian Isthmus (northwestern Russia) during the Holocene
Palaeoecological and palaeoclimatic conditions on the Karelian Isthmus (northwestern Russia) during the Holocene
The Holocene evolution of climate in easternmost Fennoscandia and adjoining regions is poorly known, compared with regions to the west. To address this, a 224-cm-long sediment core from Lake Medvedevskoe, situated on the Central Upland of the Karelian Isthmus, northwestern Russia, was examined to investigate variations in the Holocene climate. Analyses indicate that the dry and cold late Pleistocene climate was replaced by the warmer and more humid early Holocene climate after ca. 10.5 cal ka BP. During the early Holocene, the lake transitioned from an oligotrophic to a mesotrophic state, characterized by a “Corynocera ambigua/Microtendipes pedellus-type” phase, which has been found in other lakes across Fennoscandia. Taxonomic shifts in the chironomid and cladoceran communities associated with climatic amelioration were identified at ca. 10.6 and 9.17 cal ka BP using breakpoint analysis. Reconstructed July temperatures indicate climatic patterns comparable to those seen in eastern Fennoscandia. The warm period between ca. 9.5 and 5.5 cal ka BP (T July 14.5–15°C) was interrupted by a slight cooling between ca. 8.5 and 8.1 cal ka BP, possibly relating to the 8.2 event, with peak temperature reached at ca. 7.8 cal ka BP. Neoglacial cooling started after ca. 5.5 cal ka BP, the median reconstructed July temperature dropped to 2–3°C cooler than present (mean T July 13.5°C) before recovering in recent time.
Chironomids, Cladoceran, Compositional disorder, Ecosystem change, Holocene, Karelian Isthmus, LOI, Mean July air temperature, Northwestern Russia
0033-5894
65-83
Nazarova, Larisa
b48bf361-1c9a-4c25-9443-02619475c529
Syrykh, Liudmila
b4729207-a160-48cd-9fca-4ad8ffda55d8
Mayfield, Roseanna, Jane
791d3e42-f345-42b1-b5c0-b6940f2beff6
Frolova, Larisa
095a28aa-46a1-47d3-b34d-bb730a991978
Ibragimova, Aisylu
277bd3a1-06f3-4be4-8a55-1ce4f01296e8
Grekov, Ivan
fecf13ff-d1eb-4a0c-a0e5-c2af9f8103f1
Subetto, Dmitry
1329841a-a8f3-4f3d-99fe-b4e7f82c3deb
Nazarova, Larisa
b48bf361-1c9a-4c25-9443-02619475c529
Syrykh, Liudmila
b4729207-a160-48cd-9fca-4ad8ffda55d8
Mayfield, Roseanna, Jane
791d3e42-f345-42b1-b5c0-b6940f2beff6
Frolova, Larisa
095a28aa-46a1-47d3-b34d-bb730a991978
Ibragimova, Aisylu
277bd3a1-06f3-4be4-8a55-1ce4f01296e8
Grekov, Ivan
fecf13ff-d1eb-4a0c-a0e5-c2af9f8103f1
Subetto, Dmitry
1329841a-a8f3-4f3d-99fe-b4e7f82c3deb

Nazarova, Larisa, Syrykh, Liudmila, Mayfield, Roseanna, Jane, Frolova, Larisa, Ibragimova, Aisylu, Grekov, Ivan and Subetto, Dmitry (2020) Palaeoecological and palaeoclimatic conditions on the Karelian Isthmus (northwestern Russia) during the Holocene. Quaternary Research, 95, 65-83. (doi:10.1017/qua.2019.88).

Record type: Article

Abstract

The Holocene evolution of climate in easternmost Fennoscandia and adjoining regions is poorly known, compared with regions to the west. To address this, a 224-cm-long sediment core from Lake Medvedevskoe, situated on the Central Upland of the Karelian Isthmus, northwestern Russia, was examined to investigate variations in the Holocene climate. Analyses indicate that the dry and cold late Pleistocene climate was replaced by the warmer and more humid early Holocene climate after ca. 10.5 cal ka BP. During the early Holocene, the lake transitioned from an oligotrophic to a mesotrophic state, characterized by a “Corynocera ambigua/Microtendipes pedellus-type” phase, which has been found in other lakes across Fennoscandia. Taxonomic shifts in the chironomid and cladoceran communities associated with climatic amelioration were identified at ca. 10.6 and 9.17 cal ka BP using breakpoint analysis. Reconstructed July temperatures indicate climatic patterns comparable to those seen in eastern Fennoscandia. The warm period between ca. 9.5 and 5.5 cal ka BP (T July 14.5–15°C) was interrupted by a slight cooling between ca. 8.5 and 8.1 cal ka BP, possibly relating to the 8.2 event, with peak temperature reached at ca. 7.8 cal ka BP. Neoglacial cooling started after ca. 5.5 cal ka BP, the median reconstructed July temperature dropped to 2–3°C cooler than present (mean T July 13.5°C) before recovering in recent time.

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Accepted/In Press date: 18 December 2019
e-pub ahead of print date: 19 March 2020
Keywords: Chironomids, Cladoceran, Compositional disorder, Ecosystem change, Holocene, Karelian Isthmus, LOI, Mean July air temperature, Northwestern Russia

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Local EPrints ID: 439384
URI: http://eprints.soton.ac.uk/id/eprint/439384
ISSN: 0033-5894
PURE UUID: c21d193c-6bc8-494b-aca5-746e6401f815

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Date deposited: 21 Apr 2020 16:30
Last modified: 25 Nov 2021 17:40

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Contributors

Author: Larisa Nazarova
Author: Liudmila Syrykh
Author: Roseanna, Jane Mayfield
Author: Larisa Frolova
Author: Aisylu Ibragimova
Author: Ivan Grekov
Author: Dmitry Subetto

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