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Modern pollen-vegetation relationships along a steep temperature gradient in the Tropical Andes of Ecuador

  • Kimberley Hagemans (a1), Claudia-Dana Tóth (a1), Manuela Ormaza (a2), William D. Gosling (a3), Dunia H. Urrego (a4), Susana León-Yánez (a2), Friederike Wagner-Cremer (a1) and Timme H. Donders (a1)...
Abstract

The characterization of modern pollen rain assemblages along environmental gradients is an essential prerequisite for reliable interpretations of fossil pollen records. In this study, we identify pollen-vegetation relationships using modern pollen rain assemblages in moss polsters (n = 13) and lake sediment surface samples (n = 11) along a steep temperature gradient of 7°C (3100–4200 m above sea level) on the western Andean Cordillera, Ecuador. The pollen rain is correlated to vascular plant abundance data recorded in vegetation relevées (n = 13). Results show that pollen spectra from both moss polsters and sediment surface samples reflect changes in species composition along the temperature gradient, despite overrepresentation of upper montane forest taxa in the latter. Estimated pollen transport distance for a lake (Laguna Llaviucu) situated in a steep upper montane forest valley is 1–2 km, while a lake (Laguna Pallcacocha) in the páramo captures pollen input from a distance of up to 10–40 km. Weinmannia spp., Podocarpus spp., and Hedyosmum sp. are indicators of local upper montane forest vegetation, while Phlegmariurus spp. and Plantago spp. are indicators for local páramo vegetation.

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*Corresponding author e-mail address: K.Hagemans@uu.nl.
References
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