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- W2001264085 abstract "Late Holocene vegetation, climate and fire dynamics of mountain forest and paramo ecosystems, as well as human impact, are presented from the upper Rio San Francisco valley, southeastern Ecuadorian Andes. Palaeoenvironmental changes, inferred from three soil monoliths, spanning an altitudinal gradient between 1,990 and 3,200 m and the high resolution multi-proxy sediment record from Laguna Zurita (2,590 m), were investigated by pollen, spore and charcoal analyses, in combination with XRF- and magnetic susceptibility-scanning. Three of the four pollen records show a marked change in the floristic composition between ca. 900 and 350 cal b.p. (interpolated age). Past fires have strongly influenced the floristic composition of the mountain rainforest ecosystem. Frequent fires, together with the relatively high occurrence of grasses and some Zea mays plantations document past human activities in the upper Rio San Francisco valley. A large number of areas of probably ancient Z. mays cultivation in the upper Rio San Francisco valley has been identified, using GIS-based calculation. High occurrences of Cyperaceae and Isoetes indicate the development of marshy lake shores in response to a lower lake level at Laguna Zurita before ca. 700 cal b.p. The decrease of Isoetes and Cyperaceae after ca. 1200 cal b.p. reflects a lake level rise, due to increasing moisture and/or human activities." @default.
- W2001264085 created "2016-06-24" @default.
- W2001264085 creator A5017169220 @default.
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- W2001264085 date "2009-09-04" @default.
- W2001264085 modified "2023-09-27" @default.
- W2001264085 title "Late Holocene environmental change and human impact inferred from three soil monoliths and the Laguna Zurita multi-proxi record in the southeastern Ecuadorian Andes" @default.
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- W2001264085 doi "https://doi.org/10.1007/s00334-009-0226-6" @default.
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