Paleoecologic Analysis of a Late-Quaternary Terrace from Mucubaji, Venezuelan Andes

Salgado‐Labouriau, Maria Léa; Schubert, Carlos; Valastro, Salvatore

doi:10.2307/3038190

Cited by 67 publications

(34 citation statements)

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“…Other South American records also indicate interstadial conditions during this period (e.g. Salgado- Labouriau et al, 1977 andThompson et al, 1998). However, large changes in pollen percentages and concentrations of most taxa are not evident from the Lake Titicaca sedimentary sequence prior to ca.…”

Section: Deglaciationmentioning

confidence: 71%

“…The vegetation of the high Andes and the Altiplano has responded to climatic change throughout the Quaternary (Binford et al, 1996;Graf, 1981;Hansen and Rodbell, 1995;Hansen et al, 1984;Hansen et al, 1994;Kuhry, 1988;Moreno, 2000;Moreno et al, 1999;Salgado-Labouriau et al, 1977;Salgado-Labouriau et al, 1988;Van der Hammen et al, 1980Van der Hammen andGonzález, 1959 andYbert, 1988). Due to the steepness of Andean slopes and the short migratory distances, Andean plant migrations provide a sensitive paleothermometer.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A vegetation and fire history of Lake Titicaca since the Last Glacial Maximum

Paduano

Bush

Baker

et al. 2003

Palaeogeography, Palaeoclimatology, Palaeoecology

180

157

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Fine-resolution fossil pollen and charcoal analyses reconstruct a vegetation and fire history in the area surrounding Lake Titicaca (3810 m, Peru/Bolivia) since ca. 27,500 cal yr BP (hereafter BP). Time control was based on 26 accelerator mass spectrometer (AMS) radiocarbon dates. Seventeen AMS dates and 155 pollen and charcoal samples between ca. 17,500 BP and ca. 3,100 BP allow a centennial-scale reconstruction of deglacial and early-to mid-Holocene events. Local and regional fire signals were based on the separation of two charcoal size fractions, ≥180 μm and 179-65 μm. Charcoal abundance correlated closely with the proportion of woody taxa present in the pollen spectra. Little or no pollen was detected in the sedimentary record prior to ca. 21,000 BP. Very cold climatic conditions prevailed, with temperatures suggested to be at least 5-8°C cooler than present. Increases in pollen concentration suggest initial warming at ca. 21,000 BP with a more significant transition toward deglaciation ca. 17,700 BP. Between 17,700 BP and 13,700 BP, puna brava is progressively replaced by puna and sub-puna elements. The most significant changes between the Pleistocene and the Holocene floras were largely complete by 13,700 BP, providing an effective onset of near-modern conditions markedly earlier than in other Andean records. Fire first occurs in the catchment at ca. 17,700 BP and becomes progressively more important as fuel loads increase. No evidence is found of a rapid cooling and warming coincident with the Younger Dryas chron. A dry event between ca. 9,000 BP and 3,100 BP, with a peak between 6,000 and 4,000 BP, is inferred from changes in the composition of aquatics, and the marsh community as pollen of Cyperaceae is replaced by Poaceae, Apiaceae, Plantago and the shrub Polylepis. Human disturbance of the landscape is evident in the pollen spectra after ca. 3,100 BP with the appearance of weed species.

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Section: Deglaciationmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

A vegetation and fire history of Lake Titicaca since the Last Glacial Maximum

Paduano

Bush

Baker

et al. 2003

Palaeogeography, Palaeoclimatology, Palaeoecology

180

157

View full text Add to dashboard Cite

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“…Figure 13 is a tentative correlation of paleoenvironmental interpretations from the most relevant records (15)(16)(17)(18)(19)(20).…”

Section: Correlation With Late Quaternary Events In Nearby Regionsmentioning

confidence: 99%

Late Quaternary Environmental History of Lake Valencia, Venezuela

Bradbury

Leyden

Salgado‐Labouriau

et al. 1981

Science

201

113

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Chemical, paleontological, and mineralogical analyses of a 7.5-meter core from the middle of Lake Valencia, Venezuela, have provided information on the paleoclimatic history of this low-elevation, low-latitude site for the last 13,000 years. The data show that dry climates existed in this region from 13,000 years before present (B.P.) until about 10,000 years B.P. The Lake Valencia Basin was occupied by intermittent saline marshes at that time. About 10,000 years B.P., a permanent lake of fluctuating salinity formed and arboreal plant communities replaced the earlier dominant xeric herbaceous vegetation and marsh plants. By 8500 years B.P., Lake Valencia reached moderate to low salinities and discharged water; the modern vegetation became established at that time. After 8500 years B.P., the lake twice ceased discharging as a result of reduced watershed moisture. The second of these drying episodes is still in progress and has been aggravated by human activities in the watershed.

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“…Our interpretation of Late Pleistocene and Holocene glacial activity in the Mucubají valley is based on multiple sedimentary records, including a recessional moraine bog, a lateral moraine bog, a continuous record from Laguna Mucubají, and palaeoenvironmental evidence from the Mucubají Terrace (Salgado-Labouriau et al, 1977). Our methods utilised multiple proxies, including magnetic susceptibility profiles (Seltzer et al, 2002) and loss-on-ignition (LOI) measured according to standard laboratory protocols (Dean, 1974;Heiri et al, 2001;Boyle, 2004).…”

Section: Late Pleistocene-holocene Transitionmentioning

confidence: 99%

“…yr BP, and provides a minimum limiting age for ice being restricted far up-valley from its LGM position. The terrace site of Salgado-Labouriau et al (1977) is down-valley of the recessional moraine bog site and contains alternating sequences of interbedded peat, clays and glaciofluvial sediments. The lower~2.6 m of the 5 m sequence dates between 14 880 and 13 830 cal.…”

Section: Late Pleistocene-holocene Transitionmentioning

confidence: 99%