Response of chironomid assemblages to environmental change during the early Late-glacial at Gerzensee, Switzerland

Brooks, Stephen J.; Heiri, Oliver (2013). Response of chironomid assemblages to environmental change during the early Late-glacial at Gerzensee, Switzerland. Palaeogeography, Palaeoclimatology, Palaeoecology, 391(Part B), 90 - 98. Elsevier 10.1016/j.palaeo.2012.10.022

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Prior to ca. 14,660 yr BP, during the early Late-glacial (Oldest Dryas), larval assemblages of Chironomidae (Insecta: Diptera) in Gerzensee, Switzerland, were dominated by cold stenothermic taxa as well as by taxa typical of subalpine lakes today. This was the coldest period of the entire sequence. After ca. 14,660 yr BP, in the Late Glacial Interstadial (Bølling–Allerød), a temperature increase is recorded by a sharp rise in the oxygen-isotope ratio in lake marl and by an increase in the organic-matter content of the sediments. Changes in the chironomid fauna then are consistent with rising temperatures. This warming trend is interrupted between 14,070 and 13,940 yr BP, coinciding with the GI-1d cold oscillation, but the change in the chironomid assemblage is more consistent with a response to increasing lake depth and density of aquatic macrophytes than falling temperature. A rise in cold-adapted chironomid taxa between 13,840 and 13,710 yr BP suggests that summer air temperatures may have declined. Changes in the chironomid assemblage after 13,710 yr BP suggest a decline in submerged macrophytes coupled with a rise in lake productivity and summer temperature, although the latter is not reflected in the oxygen-isotope record. This suggests that there may have been increasing seasonality during this period when summer temperatures were rising, driven by rising summer insolation, and winters becoming cooler, which is largely reflected in the oxygen-isotope record. A decline in thermophilic chironomids and a rise in cold-adapted taxa after 13,180 yr BP suggest a response to cooling at the beginning of the Gerzensee Oscillation.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Palaeoecology
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Heiri, Oliver

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0031-0182

Publisher:

Elsevier

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

04 Jun 2014 17:22

Last Modified:

09 Oct 2015 16:14

Publisher DOI:

10.1016/j.palaeo.2012.10.022

Additional Information:

Early Rapid Warning

Uncontrolled Keywords:

Chironomidae, Switzerland, Late-glacial, Climatic change, Alps

BORIS DOI:

10.7892/boris.52512

URI:

https://boris.unibe.ch/id/eprint/52512

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