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  • 1
    Monograph available for loan
    Monograph available for loan
    Paleolimnology : the history and evolution of lake systems (2003)
    Oxford [u.a.] : Oxford Univ. Pr.
    Details Availability
    Call number: 9/M 03.0331
    Type of Medium: Monograph available for loan
    Pages: xxiii, 500 S.
    ISBN: 0195133536
    Classification:
    Historical Geology
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
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    Individual ostracode valve analyses of Sclerocypris clavularis from modern Lake Turkana sediments (2023)
    PANGAEA
    Details
    Publication Date: 2023-10-11
    Description: We provide stable carbon (δ¹³C) and oxygen (δ¹⁸O) isotope measurements in individual calcitic valves of extant ostracode species, Sclerocypris clavularis, from modern sediments in 17 sites across Lake Turkana, eastern Africa. These sediments were collected using a modified Ekman dredge during May-November, 1979. Pooled statistics of these individual ostracode valve analyses (IOVA) of δ¹³C and δ¹⁸O measurements (n = 329) at each site show strong correlations with lake hydrological parameters. Within-site variance in IOVA-δ¹³C is larger (~60%) than that of IOVA-δ¹⁸O. Yet, pooled averages exhibit a systematic pattern with higher δ values towards the southern part of the lake, away from Omo River inflow, which is the largest riverine input into Lake Turkana (comprising ~90% of overall inflows). We suggest that the latitudinal δ¹³C gradient may arise from low riverine δ¹³C and low organic matter δ¹³C as a productivity response to nutrient-rich Omo River inflow towards the north. The δ¹⁸O pattern may be explained by the diminishing influence of Omo River inflows and more evaporation driving higher IOVA-δ¹⁸O values towards the windier, southern basin. We conclude that pooled IOVA statistics in Omo-Turkana sediments can aid interpretations of past regional paleohydrology and its variability in this basin.
    Keywords: lake sediments; ostracodes; oxygen and carbon isotopes
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 3
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    Individual ostracode valve analyses of Sclerocypris clavularis from modern Lake Turkana sediments - Measurements (2023)
    PANGAEA
    Details
    Publication Date: 2023-10-11
    Description: This dataset contains measurements of individual ostracode valve analyses (IOVA), including stable oxygen (δ¹⁸O) and carbon (δ¹³C) isotopes, and length/width, and mass measurements, at 17 sites across Lake Turkana, eastern Africa. These sediments were collected using a modified Ekman dredge during May–November 1979. The stable isotopic measurements were conducted at the [Paleo² Laboratory at the University of Arizona|https://thirumalai.geo.arizona.edu/] on a Thermo Kiel IV Carbonate Device coupled to a 253 Plus IRMS; the length/width measurements were performed on a MeijiTechno HDZ7000TS Digital Zoom Microscope System, and mass of each valve was measured using a Sartorius Cubis II Ultra-Micro Balance. Details can be found in https://doi.org/10.1029/2022GC010790
    Keywords: 79-130F; 79-147F; 79-158F; 79-160F; 79-164F; 79-166F; 79-168F; 79-170F; 79-183F; 79-189F; 79-193F; 79-194F; 79-204F; 79-77F; BS125; BS90; BS91; Digital Zoom Microscope System, MeijiTechno, HDZ7000TS; EG; Ekman grab; Elevation of event; Event label; Hole; lake sediments; Lake Turkana, Africa; Latitude of event; Longitude of event; Mass spectrometer ThermoFisher Scientific 253plus gas coupled to a KIEL IV carbonate preparation device; Ostracoda, length; Ostracoda, mass; Ostracoda, δ13C; Ostracoda, δ18O; ostracodes; oxygen and carbon isotopes; Ultra-micro lab balance, Sartorius Cubis II
    Type: Dataset
    Format: text/tab-separated-values, 1974 data points
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  • 4
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    Individual ostracode valve analyses of Sclerocypris clavularis from modern Lake Turkana sediments - Inter-site means (2023)
    PANGAEA
    Details
    Publication Date: 2023-10-11
    Description: This dataset contains pooled statistics of stable isotope and shell measurements of individual ostracode valve analyses (IOVA) alongside available in-situ measurements of pH, surface and bottom water temperature (BWT), total number of valves analyzed per site, IOVA-δ¹⁸O, IOVA-δ¹³C, shell mass, shell length/width, along with their average and standard deviations at 17 sites across Lake Turkana, eastern Africa. These modern sediments were collected using a modified Ekman dredge during May to November 1979. The stable isotopic measurements were conducted at the [Paleo² Laboratory at the University of Arizona|https://thirumalai.geo.arizona.edu/] on a Thermo Kiel IV Carbonate Device coupled to a 253 Plus IRMS; the length/width measurements were performed on a MeijiTechno HDZ7000TS Digital Zoom Microscope System, and mass of each valve was measured using a Sartorius Cubis II Ultra-Micro Balance. Details about the materials can be found in https://doi.org/10.1029/2022GC010790
    Keywords: 79-130F; 79-147F; 79-158F; 79-160F; 79-164F; 79-166F; 79-168F; 79-170F; 79-183F; 79-189F; 79-193F; 79-194F; 79-204F; 79-77F; Bottom water temperature; BS125; BS90; BS91; Digital Zoom Microscope System, MeijiTechno, HDZ7000TS; Distance; EG; Ekman grab; Elevation of event; Event label; lake sediments; Lake Turkana, Africa; Latitude of event; Longitude of event; Mass spectrometer ThermoFisher Scientific 253plus gas coupled to a KIEL IV carbonate preparation device; Number of measurements; Ostracoda, length; Ostracoda, length, standard deviation; Ostracoda, mass; Ostracoda, mass, standard deviation; Ostracoda, δ13C; Ostracoda, δ13C, standard deviation; Ostracoda, δ18O; Ostracoda, δ18O, standard deviation; ostracodes; oxygen and carbon isotopes; pH; Sea surface temperature; Site; Ultra-micro lab balance, Sartorius Cubis II
    Type: Dataset
    Format: text/tab-separated-values, 243 data points
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  • 5
    Electronic Resource
    Electronic Resource
    Electroweak Baryogenesis (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 688 (1993), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1993.tb43899.x
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  • 6
    Electronic Resource
    Electronic Resource
    Climate change decreases aquatic ecosystem productivity of Lake Tanganyika, Africa (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 424 (2003), S. 766-768 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Although the effects of climate warming on the chemical and physical properties of lakes have been documented, biotic and ecosystem-scale responses to climate change have been only estimated or predicted by manipulations and models. Here we present evidence that climate warming is diminishing ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01833
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  • 7
    Electronic Resource
    Electronic Resource
    Releasing Rain Forest Succession: A Case Study in the Dicranopteris linearis Fernlands of Sri Lanka (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Restoration ecology 3 (1995), S. 0 
    Details
    ISSN: 1526-100X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Throughout tropical moist climates, Dicranopteris linearis fernlands can develop as a result of rain forest clearance followed by frequent burning. In Sri Lanka, D. linearis fern-lands are capable of suppressing the regeneration of rain forest. Field experiments were conducted at Sinharaja Man and Biosphere Reserve, a rain forest where fernlands occupy substantial areas of the reserve boundary. The experiment's objective was to identify methods for initiating forest regeneration in fernlands dominated by D. linearis Three disturbance treatments were used to initiate seedling regeneration: clean weed, root removal, and till. We hypothesized that increasing the severity of the soil disturbance would establish vegetation with higher species richness and diversity, greater above-ground dry biomass, and higher percentage cover and seedling density. Results indicate only partial support for this hypothesis. Dry biomass was greatest in till treatments, the most severe soil disturbance. By comparison, species richness and diversity, seedling density, and percentage cover were greatest in root-removal treatments, though in many instances the differences were not significant. The study clearly demonstrated that any kind of soil disturbance can facilitate the establishment of herbs, shrubs, and trees in a fernland dominated by D. linearis. Results showed that herbs, sedges, grasses, and pioneer shrubs represented greater proportions of seedling recruits than did pioneer trees. Seedlings of primary-forest tree species were nearly nonexistent. In general, results showed that soil disturbance can play an important role in site preparation for the purpose of initiating non-fern vegetation in fernlands dominated by D. linearis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1526-100X.1995.tb00093.x
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  • 8
    Electronic Resource
    Electronic Resource
    Speciation in molluscs from Turkana Basin (1983)
    [s.l.] : Nature Publishing Group
    Nature 304 (1983), S. 659-660 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SEVERAL of Williamson's conclusions on Speciation in the freshwater molluscs of the Turkana Basin1 are based on assumptions which need further examination. Here we comment on some relevant research in the Koobi Fora area. Although the snail faunas collected by Williamson represent 'life and death ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/304659a0
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  • 9
    Electronic Resource
    Electronic Resource
    A paleoclimate record for the past 250,000 years from Summer Lake, Oregon, USA: II. Sedimentology, paleontology and geochemistry (2000)
    Springer
    Journal of paleolimnology 24 (2000), S. 151-182 
    Details
    ISSN: 1573-0417
    Keywords: paleolimnology ; paleoclimate ; Great Basin ; ostracodes ; palynology ; Pleistocene ; Quaternary ; trace elements ; oxygen and carbon isotopes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract We have obtained a detailed paleoenvironmental record in the Summer Lake Basin, Oregon (northwestern Great Basin, US) spanning from 250ka-5 ka. This record is derived from core and outcrop sites extending from a proximal deltaic setting to near the modern depocenter. Lithostratigraphic, paleontologic (ostracodes and pollen) and geochemical indicators all provide evidence for hydroclimate and climate change over the study interval.Lithostratigraphic analysis of the Summer Lake deposits allows subdivision into a series of unconformity - or paraconformity-bound lithosomes. The unconformity and facies histories indicate that the lake underwent several major lake-level excursions through the Middle and Late Pleistocene. High stands occurred between ~200 and ~165 ka, between ~89 and 50 ka and between ~25 and 13 ka. Uppermost Pleistocene and Holocene sediments have been removed by deflation of the basin, with the exception of a thin veneer of late Holocene sediment. These high stands correspond closely with Marine Oxygen Isotope Stages 6, 4 and 2, within the margin of error associated with the Summer Lake age model. A major unconformity from ~158 ka until ~102 ka (duration varies between sites) interrupts the record at both core and outcrop sites.Lake level fluctuations, in turn are closely linked with TOC and salinity fluctuations, such that periods of lake high stands correlate with periods of relatively low productivity, fresher water and increased water inflow/evaporation ratios. Paleotemperature estimates based on palynology and geochemistry (Mg/Ca ratios in ostracodes) indicate an overall decrease in temperature from ~236 ka-165 ka, with a brief interlude of warming and drying immediately after this (prior to the major unconformity). This temperature decrease was superimposed on higher frequency variations in temperature that are not evident in the sediments deposited during the past 100 ka. Indicators disagree about temperatures immediately following the unconformity (~102-95 ka), but most suggest warmer temperatures between ~100-89 ka, followed by a rapid and dramatic cooling event. Cooler conditions persisted throughout most of the remainder of the Pleistocene at Summer Lake, with the possible exception of brief warm intervals about 27-23 ka. Paleotemperature estimates for the proximal deltaic site are more erratic than for more distal sites, indicative of short term air temperature excursions that are buffered in deeper water.Estimates of paleotemperature from Mg/Ca ratios are generally in good agreement with evidence from upland palynology. However, there is a significant discordance between the upland pollen record and lake indicators with respect to paleoprecipitation for some parts of the record. Several possibilities may explain this discordance. We favor a direct link between lake level and salinity fluctuations and climate change, but we also recognize the possibility that some of these hydroclimate changes in the Summer Lake record may have resulted from episodic drainage captures of the Chewaucan River between the Summer Lake and Lake Abert basins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008165326401
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  • 10
    Electronic Resource
    Electronic Resource
    A paleoclimate record for the past 250,000 years from Summer Lake, Oregon, USA. 1. chronology and magnetic proxies for lake level (2000)
    Springer
    Journal of paleolimnology 24 (2000), S. 125-149 
    Details
    ISSN: 1573-0417
    Keywords: paleolimnology ; paleoclimate ; Great Basin ; environmental magnetism ; paleomagnetic secular variation ; pleistocene ; quaternary
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract This study presents the age control and environmental magnetism components of a new, late Pleistocene paleoclimate record for the Great Basin of western North America. Two new cores from the Summer Lake sub-basin of pluvial Lake Chewaucan, Oregon, USA are correlated to basin margin outcrops on the basis of tephrochronology, lithostratigraphy, sediment magnetism and paleomagnetic secular variation. Eleven tephra layers were found in the cores that correlate to tephra identified previously in the outcrop. The Olema ash was also found in one of the cores; its stratigraphic position, relative to 3 dated tephra layers, indicates that its age is 50-55 ka, somewhat younger than has been previously reported. The Summer Lake sediments are divided into deep and shallow lake lithosomes based on sedimentary features. The stratigraphic position of these lithosomes support the tephra-based correlations between the outcrop and the cores. These sediments contain a well resolved record of the Mono Lake Excursion (MLE) and an earlier paleomagnetic excursion as well as a high quality replication of the paleosecular variation immediately above the MLE. Relative sedimentation rates increased dramatically toward the depocenter during intervals of low-lake level. In contrast, during intervals of high-lake level, relative sedimentation rates were comparable along the basin axis from the basin margin to the depocenter. The magnetic mineralogy of the Summer Lake sediments is dominated by pseudo-single domain (titano)magnetite and intervals of high/low magnetite concentration coincide with lithosomes that indicate high/low lake levels. Magnetic grain size also varies in accord with bulk sediment grain size as indicated by the silt/clay ratio. To a first order, variations in magnetic parameters, especially those attributable to the concentration of magnetic minerals, correlate well with global glacial/interglacial oscillations as indicated by marine oxygen isotope stages. This relationship can be explained by increased dissolution of (titano)magnetite minerals as lake level dropped and the lake became more productive biologically. This inference is supported by a correspondence between lower concentrations of magnetite with higher levels of total organic carbon and vice-versa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008144025492
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