Diatom-based transfer functions for inferring past hydrochemical characteristics of African lakes

Gasse, F.; Juggins, Steve; Khelifa, Leila Ben

doi:10.1016/0031-0182(94)00122-o

Cited by 310 publications

(166 citation statements)

References 25 publications

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“…Based on the literature on diatom ecology (e.g. Hecky and Kilham, 1973;Haworth, 1977;Gasse et al, 1983Gasse et al, , 1995Evans, 1997), we suggest that Axis 1 broadly approximates conductivity tolerances, with possible contributions from pH and cation ratios, and that Axis 2 largely reflects water depth. Aulacoseira spp.…”

Section: Common Diatom Taxa and Habitatsmentioning

confidence: 69%

“…5. Gasse et al (1995) noted that diatoms respond principally to conductivity (or total salinity) and to ionic ratios: Na (Renaut et al, 1987), and this is also likely to be the case during deposition in the Olorgesailie paleolakes and wetlands, which were fed by streams draining similar volcanic rocks as those present today. Furthermore, the dominant taxa present in the Olorgesailie Formation have been reported as indicative of HCO 3 − + CO 3 2− settings (Gasse et al, 1997).…”

Section: Common Diatom Taxa and Habitatsmentioning

confidence: 99%

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Diatomaceous sediments and environmental change in the Pleistocene Olorgesailie Formation, southern Kenya Rift Valley

Owen

Potts

Behrensmeyer

et al. 2008

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Common Diatom Taxa and Habitatsmentioning

confidence: 69%

Section: Common Diatom Taxa and Habitatsmentioning

confidence: 99%

Diatomaceous sediments and environmental change in the Pleistocene Olorgesailie Formation, southern Kenya Rift Valley

Owen

Potts

Behrensmeyer

et al. 2008

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…The development of larger, combined datasets has previously been undertaken in Africa (e.g. Gasse et al 1995), Europe (e.g. Juggins 2004;Bennion 2010) and North America (e.g.…”

Section: Introductionmentioning

confidence: 99%

A diatom dataset and diatom-salinity inference model for southeast Australian estuaries and coastal lakes

Saunders

2010

J Paleolimnol

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To quantify the relationship between diatom species assemblages and the water chemistry of southeast Australian estuaries and coastal lakes, a new dataset of 81 modern diatom samples and water chemistry data was created. Three hundred and ninetynine species from 53 genera were identified in 36 samples from 32 coastal water bodies in eastern Tasmania and 45 samples from 13 coastal water bodies in southern Victoria. Multivariate statistical analyses revealed that the sampling sites were primarily distributed along salinity and nutrient gradients, and that salinity, nitrate ? nitrite, phosphate and turbidity explained independent portions of variance in the diatom data. Species salinity optima and tolerances were determined and a diatom-salinity inference model (WAinv r 2 = 0.72, r 2 jack = 0.58, RMSEP = 0.09 log ppt) was developed. This new information on diatom species' salinity preferences provides a useful tool for quantitatively reconstructing salinity changes over time from diatom microfossils preserved in the sediments of a range of estuaries and coastal lakes in southeast Australia. This is valuable for studies investigating long-term human impacts and climate change in the region.

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“…Hydrochemically, endoreic basin lakes, well represented in the oriental branch of the East African Rift (Fig.1), react to changes in the ratio between precipitation and evaporation by changes in depth and salinity (StreetPerrott and Harrison, 1985;Mason et al, 1994;Vance and Wolfe, 1996). Some indicators, such as diatoms, ostracodes and stable isotopes record this chemical variation and can be used in sedimentary archives as proxy-data for paleolimnological and paleoclimatological reconstructions via transfer functions (Gasse et al, 1995;Cohen et al, 1997;Verschuren et al, 2000;Barker et al, 2002;Grosjean et al, 2003). However, hydrothermal inputs, water/saline rock interactions and inputs contaminated by humans have also to be taken into account.…”

Section: Introductionmentioning

confidence: 99%

Chloride concentrations in Lake Tanganyika: an indicator of the hydrological budget?

Branchu¹,

Bouchet

2004

Hydrol. Earth Syst. Sci.

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On a historical time scale, this paper investigates the effect of hydroclimatic variations on the surface water salinity of Lake Tanganyika, the largest African lake and an open freshwater reservoir. Through annual water and chemical budgets, based on original and bibliographic data, a tracer of the water regime is proposed. Chloride, an inert and conservative element, seems to be the best candidate although its contribution to salinity is small; its use as a tracer of the water regime is validated on seasonal and historical time scales. Seasonally, a monthly water and chloride budget, constructed for an average year has been compared with data acquired in 1973. On a historical time scale, bibliographic data of surface chloride concentrations, compiled since 1939 have been compared with the level variation curve. The relation between lake level and surface water chloride concentration is significant on both time scales. Hence, the surface salinity/chlorinity of this freshwater lake is sensitive to hydroclimatic variations even if level variations are very limited in comparison with its great depth. This sensitivity is due mainly to the permanent thermo-haline stratification of the lake.

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Diatom-based transfer functions for inferring past hydrochemical characteristics of African lakes

Cited by 310 publications

References 25 publications

Diatomaceous sediments and environmental change in the Pleistocene Olorgesailie Formation, southern Kenya Rift Valley

Diatomaceous sediments and environmental change in the Pleistocene Olorgesailie Formation, southern Kenya Rift Valley

A diatom dataset and diatom-salinity inference model for southeast Australian estuaries and coastal lakes

Chloride concentrations in Lake Tanganyika: an indicator of the hydrological budget?

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