A revised 30,000-year paleoclimatic and paleohydrologic history of Lake Albert, East Africa

Beuning, Kristina R. M.; Talbot, Michael R.; Kelts, Kerry

doi:10.1016/s0031-0182(97)00034-5

Cited by 204 publications

(89 citation statements)

References 34 publications

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“…The population expansion model was further supported by the fact that both lineages had relatively high haplotype diversity (0.864 and 0.848, respectively) in contrast to having low nucleotide diversity (0.0087 and 0.0046, respectively), a scenario which suggests that the two lineages experienced population bottlenecks followed by population expansions (Avise 2000). The mismatch distribution topologies were very similar, and expansion times were close, suggesting that the expansion events may have occurred in the same period, most probably during the late Pleistocene, when the African continent went through alternating dry and wet climatic phases that may have led to bottlenecks and expansions in fish populations and speciation (Agnèse et al 1997;Beuning et al 1997). The negative values of Fu's index and Tajima's D further support the hypothesis of recent population expansion.…”

Section: Mismatch Analysis and Demographic Historymentioning

confidence: 52%

Evolutionary history of Nile perch Lates sp. inferred from mitochondrial DNA variation analyses

Mwanja¹,

Muwanika

Masembe

et al. 2013

Zool. Stud.

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Background: Evolutionary histories of aquatic species are often characterized by distinct patterns of genetic variation, which in part reflect drainage evolution. In the present study, the consequences of paleo-environmental changes on patterns of genetic variation of the mitochondrial DNA control region in Nile perch Lates sp. sampled from seven water bodies across the African continent were investigated. Results: In a total sample of 124 individual sequences, 37 distinct haplotypes were observed, and 78.4% of these haplotypes were location specific. Haplotypes were found to cluster into two major groups, one composed of individuals sampled from East Africa and another from West Africa, with no haplotypes shared in between.

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Section: Mismatch Analysis and Demographic Historymentioning

confidence: 52%

Evolutionary history of Nile perch Lates sp. inferred from mitochondrial DNA variation analyses

Mwanja¹,

Muwanika

Masembe

et al. 2013

Zool. Stud.

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“…Limiting 14 C dating to large terrestrial plant macrofossils is often not a viable option, because such fossils are often scarce or, in fluctuating lakes, also subject to reworking from older horizons (Verschuren, 2001). Other African studies (e.g., Beuning et al, 1997) have obtained terrestrial 14 C dates on fossil pollen concentrates extracted from lake sediments (Brown et al, 1989). However, since pollen is highly resistant to decay and known to survive long in soils, it may be a significant component of aged carbon from in-washed terrestrial soils or reworked older lake deposits.…”

Section: Discussionmentioning

confidence: 99%

High-resolution 14C dating of a 25,000-year lake-sediment record from equatorial East Africa

Blaauw

Geel

Kristen

et al. 2011

Quaternary Science Reviews

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C chronology 14 C age offsets Bayesian ageedepth modelling a b s t r a c tWe dated a continuous, w22-m long sediment sequence from Lake Challa (Mt. Kilimanjaro area, Kenya/ Tanzania) to produce a solid chronological framework for multi-proxy reconstructions of climate and environmental change in equatorial East Africa over the past 25,000 years. The age model is based on a total of 168 AMS 14 C dates on bulk-organic matter, combined with a 210 Pb chronology for recent sediments and corrected for a variable old-carbon age offset. This offset was estimated by i) pairing bulkorganic 14 C dates with either 210 Pb-derived time markers or 14 C dates on grass charcoal, and ii) wigglematching high-density series of bulk-organic 14 C dates. Variation in the old-carbon age offset through time is relatively modest, ranging from w450 yr during glacial and late glacial time to w200 yr during the early and mid-Holocene, and increasing again to w250 yr today. The screened and corrected 14 C dates were calibrated sequentially, statistically constrained by their stratigraphical order. As a result their constrained calendar-age distributions are much narrower, and the calibrated dates more precise, than if each 14 C date had been calibrated on its own. The smooth-spline age-depth model has 95% age uncertainty ranges of w50e230 yr during the Holocene and w250e550 yr in the glacial section of the record.The d 13C values of paired bulk-organic and grass-charcoal samples, and additional 14 C dating on selected turbidite horizons, indicates that the old-carbon age offset in Lake Challa is caused by a variable contribution of old terrestrial organic matter eroded from soils, and controlled mainly by changes in vegetation cover within the crater basin.

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“…from 22,000 until 12,000 years BP in Lake Turkana as recorded in seismic profiles of the lake (Johnson et al 1987;Morrissey and Scholz 2014) and relict beach ridge sequences up to~100 m above present lake level (Brown and Fuller 2008). This period correlates to generally cooler-and drier-than-present conditions across equatorial and northern Africa associated with deglaciation of the northern latitudes and cooling in the North Atlantic Ocean (Berke et al 2012b;Beuning et al 1997;Braconnot et al 2000;Gasse 2000;Gasse et al 2008;Schefuß et al 2011;Stager and Mayewski 1997;Tiercelin et al 1988;Tierney et al 2011).…”

Section: Paleoclimate Of the Turkana Catchmentmentioning

confidence: 97%

Lakeside View: Sociocultural Responses to Changing Water Levels of Lake Turkana, Kenya

et al. 2015

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Throughout the Holocene, Lake Turkana has been subject to drastic changes in lake levels and the subsistence strategies people employ to survive in this hot and arid region. In this paper, we reconstruct the position of the lake during the Holocene within a paleoclimatic context. Atmospheric forcing mechanisms are discussed in order to contextualize the broader landscape changes occurring in eastern Africa over the last 12,000 years. The Holocene is divided into five primary phases according to changes in the strand-plain evolution, paleoclimate, and human subsistence strategies practiced within the basin. Early Holocene fishing settlements occurred adjacent to high and relatively stable lake levels. A period of high-magnitude oscillations in lake levels Afr Archaeol Rev (2015) ensued after 9,000 years BP and human settlements appear to have been located close to the margins of the lake. Aridification and a final regression in lake levels ensued after 5,000 years BP and human communities were generalized pastoralists-fishers-foragers. During the Late Holocene, lake levels may have dropped below their present position and subsistence strategies appear to have been flexible and occasionally specialized on animal pastoralism. Modern missionary and government outposts have encouraged the construction of permanent settlements in the region, which are heavily dependent on outside resources for their survival. Changes in the physical and cultural environments of the Lake Turkana region have been closely correlated, and understanding the relationship between the two variables remains a vital component of archaeological research.Résumé Tout l'Holocène, le lac Turkana a été soumis à des changements drastiques dans l'altitude des lacs et les stratégies de subsistance des gens utilisent pour survivre dans cette région chaude et aride. Dans cet article, nous reconstruisons la position du lac au cours de l'Holocène dans un contexte paléoclimatique. Mécanismes de forçage atmosphériques sont discutées afin de contextualiser les changements de paysage plus larges qui se produisent en Afrique orientale au cours des 12.000 dernières années. L'Holocène est divisé en cinq phases principales en fonction des changements dans l'évolution altitude du lac, paléoclimats et les stratégies de subsistance humains pratiqués dans le bassin. Premiers établissements de pêche de l'Holocène ont eu lieu à proximité d'altitude d'eau élevés et relativement stables. Une période d'oscillations de grande amplitude dans l'altitude du lac s'ensuit après 9000 années BP et les établissements humains semblent avoir été situé à proximité des marges sur le lac. Aridification et une régression finale du altitude des lacs s'ensuit après 5000 années BP et les communautés humaines sont généralisées éleveurs-pêcheurs-cueilleurs. Au cours de l'Holocène tardif, les altitudes des lacs pourraient avoir chuté en dessous de leur position actuelle et les stratégies de subsistance semblent avoir fait preuve de souplesse et de temps en temps spécialisé sur le pas...

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A revised 30,000-year paleoclimatic and paleohydrologic history of Lake Albert, East Africa

Cited by 204 publications

References 34 publications

Evolutionary history of Nile perch Lates sp. inferred from mitochondrial DNA variation analyses

Evolutionary history of Nile perch Lates sp. inferred from mitochondrial DNA variation analyses

High-resolution 14C dating of a 25,000-year lake-sediment record from equatorial East Africa

Lakeside View: Sociocultural Responses to Changing Water Levels of Lake Turkana, Kenya

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