Response of subfossil Cladocera in Gerzensee (Swiss Plateau) to early Late Glacial environmental change

Nováková, Katařina; van Hardenbroek, M.; van der Knaap, Willem Oscar (2013). Response of subfossil Cladocera in Gerzensee (Swiss Plateau) to early Late Glacial environmental change. Palaeogeography, Palaeoclimatology, Palaeoecology, 391(Part B), pp. 84-89. Elsevier 10.1016/j.palaeo.2012.10.021

[img] Text
Response of subfossil Cladocera in Gerzensee (Swiss Plateau) to early Late Glacial environmental change.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (380kB) | Request a copy

Sub-fossil Cladocera were studied in a core from Gerzensee (Swiss Plateau) for the late-glacial periods of Oldest Dryas, Bølling, and Allerød. Cladocera assemblages were dominated by cold-tolerant littoral taxa Chydorus sphaericus, Acroperus harpae, Alonella nana, Alona affinis, and Alonella excisa. The rapid warming at the beginning of the Bølling (GI-1e) ca. 14,650 yr before present (BP: before AD 1950) was indicated by an abrupt 2‰ shift in carbonate δ18O and a clear change in pollen assemblages. Cladocera assemblages, in contrast, changed more gradually. C. sphaericus and A. harpae are the most cold-tolerant, and their abundance was highest in the earliest part of the record. Only 150–200 years after the beginning of the Bølling warming we observed an increase in less cold-tolerant A. excisa and A. affinis. The establishment of Alona guttata, A. guttata var. tuberculata, and Pleuroxus unicatus was delayed by ca. 350, 770, and 800 years respectively after the onset of the Bølling. The development of the Cladocera assemblages suggests increasing water temperatures during the Bølling/Allerød, which agrees with the interpretation by von Grafenstein et al. (2013-this issue) that decreasing δ18O values in carbonates in this period reflect increasing summer water temperatures at the sediment–water interface. Other processes also affected the Cladocera community, including the development and diversification of aquatic vegetation favourable for Cladocera. The record is clearly dominated by Chydoridae, as expected for a littoral core. Yet, the planktonic Eubosmina-group occurred throughout the core, with the exception of a period at ca. 13,760–13,420 yr BP. Lake levels reconstructed for this period are relatively low, indicating that the littoral location might have become too shallow for Eubosmina in that period.

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:

van Hardenbroek, Maarten Reinier and van der Knaap, Willem Oscar

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0031-0182

Publisher:

Elsevier

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

04 Jun 2014 17:02

Last Modified:

09 Oct 2015 16:16

Publisher DOI:

10.1016/j.palaeo.2012.10.021

Uncontrolled Keywords:

Palaeolimnology, Cladocera, Late-glacial, Bølling, Climatic change, Biotic response, Switzerland

BORIS DOI:

10.7892/boris.52520

URI:

https://boris.unibe.ch/id/eprint/52520

Actions (login required)

Edit item Edit item
Provide Feedback