Water-level fluctuations of Lake Tanganyika in phase with oceanic changes during the last glaciation and deglaciation

Gasse, F.; Lédée, Vincent; Massault, M.; Fontes, Jean-Charles

doi:10.1038/342057a0

Cited by 193 publications

(84 citation statements)

References 14 publications

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“…Other changes accompany the geochemical shifts. In the diatom flora, the previously dominant Cyclostephanos was abruptly replaced by Aulacoseira (Melosira) [Haberyan and Hecky, 1987;Gasse et al, 1989]. Smear slides show that in MPU-3 and -10 this change occurs over a sediment thickness of just a few cm, within the interval where d 13 C falls to a minimum.…”

Section: Lake Tanganyikamentioning

confidence: 98%

“…Figure 3 shows geochemical data from core MPU-10 collected from a depth of 422 m. from the southern basin of this lake as part of the Georift project [Tiercelin and Mondeguer, 1991]. Additional data come from cores MPU-3 , MPU-12 [Gasse et al, 1989;Hillaire-Marcel et al, 1989] and T-2 [Livingstone, 1965;Haberyan and Hecky, 1987]. Correlation of the terminal Pleistocene section in these cores is aided by a prominent tephra that occurs throughout the southern basin (Figure 3).…”

Section: Lake Tanganyikamentioning

confidence: 99%

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An abrupt change in the African monsoon at the end of the Younger Dryas

Talbot

Filippi

Jensen

et al. 2007

Geochem Geophys Geosyst

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[1] High-resolution studies of variations in the elemental and stable carbon-and nitrogen-isotope composition of organic matter in cores from Lakes Malawi, Tanganyika, and Bosumtwi (tropical Africa) indicate an abrupt change in the wind-driven circulation of these lakes that, within the limits of available chronologies, was contemporaneous with the end of the Younger Dryas in the northern hemisphere. The change was also coincident with shifts in surface winds recorded in cores from off the west and northeast coasts of Africa. A range of other proxies indicate that these changes in wind regime were accompanied by a marked increase in precipitation in the northern tropics. Africa south of 5°-10°S, on the other hand, initially suffered drought conditions. Together, the evidence suggests an abrupt northward translation of the African monsoon system at circa 11.5 ± 0.25 ka B.P. The data assembled here contribute to a growing body of work showing that the Younger Dryas was a major climatic excursion in tropical Africa. Furthermore, they add substance to recent suggestions that climatic events in the southern hemisphere may have played a significant role in the abrupt demise of the Younger Dryas.

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Section: Lake Tanganyikamentioning

confidence: 98%

Section: Lake Tanganyikamentioning

confidence: 99%

An abrupt change in the African monsoon at the end of the Younger Dryas

Talbot

Filippi

Jensen

et al. 2007

Geochem Geophys Geosyst

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“…There is a growing body of literature suggesting wet/dry cycles occur in the East African Rift in concert with astronomically driven (Milankovitch) glacial-interglacial obliquity cycles (~ 41,000 yrs) in addition to precession cycles (19,000-23,000 yrs; Pokras and Mix, 1987;Gasse et al, 1989;Ruddiman et al, 1989;Imbrie et al, 1993;deMenocal and Bloemendal, 1995;Trauth et al, 2005;Deino et al, 2006). Alhough the continental record is discontinuous and cannot be expected to mirror the marine sedimentary sequence (see Sikes, 1999), stable isotopic studies of paleosols have been correlated with other continental or global proxy records of paleoclimate (Smith et al, 1993;deMenocal, 1995;Quade et al, 1995).…”

Section: Paleoclimatementioning

confidence: 99%

Stable isotopes of pedogenic carbonates as indicators of paleoecology in the Plio-Pleistocene (upper Bed I), western margin of the Olduvai Basin, Tanzania

Sikes

Ashley

2007

Journal of Human Evolution

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“…The appearance of Cyclotella ocellata, a facultative plankter often considered to be littoral, at the top of zone D-2 suggests declining lake levels. Although there are no modern analogues in East Africa where C. ocellata is a dominant taxon, fossil assemblages rich in C. ocellata have been reported from Lakes Abhé and Tanganyika, where it was associated with water depths ranging from 100 to 150 m (38,39). D-8 (85-10 ka).…”

Section: Diatom Zones D-1 To D-4 (150 -85 Ka)mentioning

confidence: 99%

Ecological consequences of early Late Pleistocene megadroughts in tropical Africa

Cohen¹,

Stone

Beuning

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

258

187

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This resulted in extraordinarily low lake levels, even in Africa's deepest lakes. On the basis of well dated paleoecological records from Lake Malawi, which reflect both local and regional conditions, we show that this aridity had severe consequences for terrestrial and aquatic ecosystems. During the most arid phase, there was extremely low pollen production and limited charred-particle deposition, indicating insufficient vegetation to maintain substantial fires, and the Lake Malawi watershed experienced cool, semidesert conditions (<400 mm/yr precipitation). Fossil and sedimentological data show that Lake Malawi itself, currently 706 m deep, was reduced to an Ϸ125 m deep saline, alkaline, well mixed lake. This episode of aridity was far more extreme than any experienced in the Afrotropics during the Last Glacial Maximum (Ϸ35-15 ka). Aridity diminished after 95 ka, lake levels rose erratically, and salinity/alkalinity declined, reaching near-modern conditions after 60 ka. This record of lake levels and changing limnological conditions provides a framework for interpreting the evolution of the Lake Malawi fish and invertebrate species flocks. Moreover, this record, coupled with other regional records of early Late Pleistocene aridity, places new constraints on models of Afrotropical biogeographic refugia and early modern human population expansion into and out of tropical Africa. cichlid evolution ͉ Lake Malawi ͉ Out-of-Africa Hypothesis ͉ paleoclimate ͉ paleolimnology

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Water-level fluctuations of Lake Tanganyika in phase with oceanic changes during the last glaciation and deglaciation

Cited by 193 publications

References 14 publications

An abrupt change in the African monsoon at the end of the Younger Dryas

An abrupt change in the African monsoon at the end of the Younger Dryas

Stable isotopes of pedogenic carbonates as indicators of paleoecology in the Plio-Pleistocene (upper Bed I), western margin of the Olduvai Basin, Tanzania

Ecological consequences of early Late Pleistocene megadroughts in tropical Africa

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