From desiccation to wetlands and outflow: Rapid re-filling of Lake Victoria during the Latest Pleistocene 14–13 ka

Wienhues, Giulia; Temoltzin-Loranca, Yunuen; Vogel, Hendrik; Morlock, Marina A.; Cohen, Andrew S.; Anselmetti, Flavio S.; Bernasconi, Stefano M.; Jaggi, Madalina; Tylmann, Wojciech; Kishe, Mary A.; King, Leighton Rebecca; Ngoepe, Nare; Courtney-Mustaphi, Colin J.; Muschick, Moritz; Matthews, Blake; Mwaiko, Salome; Seehausen, Ole; Tinner, Willy; Grosjean, Martin (2023). From desiccation to wetlands and outflow: Rapid re-filling of Lake Victoria during the Latest Pleistocene 14–13 ka. Journal of Great Lakes Research, 50(3), p. 102246. Elsevier 10.1016/j.jglr.2023.102246

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Reconstructing hydrological variability is critical for understanding Lake Victoria’s ecosystem history, the
evolution of its diverse endemic fish community, the dynamics of vegetation in the catchment, and the dispersal
of aquatic and terrestrial fauna in the East African Rift system during Latest Pleistocene and Holocene times.
Whereas consensus exists on widespread desiccation of Lake Victoria ~18 – 17 ka, the re-filling history (16 – 13
ka) has remained highly controversial. Here, we present data from four new sediment cores along a depth
transect. We use lithostratigraphic core correlation, sediment facies, XRF data, wetland vegetation analysis
(Typha pollen), and 14C chronologies of unprecedented precision to document Latest Pleistocene lake-level
variability. At our coring site in the central basin, local Typha wetlands existed >16.7 ka, alternating with periods
of desiccation. Moisture increased slightly between ca. 16.7 – 14.5 ka and wetlands with permanent,
shallow ponds established simultaneously in the center and the marginal, more elevated parts of the flat lake
basin. After ca. 14.0 ka, lake levels increased; wetlands in the central basin were submerged and replaced by
lacustrine environments and a >50 m deep lake established ca. 13.5 ka, likely with intermittent overflow most of
the time. The lake reached modern or even above-modern levels around 10.8 ka. This lake-level history is
consistent with regional terrestrial paleoenvironmental reconstructions, notably the expansion of Afromontane
and rainforest. Our data suggest a complex picture of paleoclimatic conditions in Eastern Africa and teleconnections
to the North-Atlantic and Indian Ocean domains.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Physical Geography > Unit Paleolimnology
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE)
08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geography
08 Faculty of Science > Institute of Geography > Physical Geography
08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE) > Aquatic Ecology
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Wienhues, Giulia Luise, Temoltzin Loranca, Yunuen, Vogel, Hendrik, Morlock, Marina Alexandra, Anselmetti, Flavio, King, Leighton Rebecca, Ngoepe, Dora Nare, Muschick, Moritz, Seehausen, Ole, Tinner, Willy, Grosjean, Martin

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 550 Earth sciences & geology
500 Science > 580 Plants (Botany)

ISSN:

0380-1330

Publisher:

Elsevier

Language:

English

Submitter:

Stan Jonah Schouten

Date Deposited:

16 Nov 2023 12:17

Last Modified:

16 Jun 2024 02:18

Publisher DOI:

10.1016/j.jglr.2023.102246

Uncontrolled Keywords:

Climate change Late quaternary Limnogeology Paleolimnology Lake sediments Eastern Africa

BORIS DOI:

10.48350/188318

URI:

https://boris.unibe.ch/id/eprint/188318

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