Modern Vegetation and Pollen Relationships in Four Southwestern Atlantic Coastal Lagoons |
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| Authors: | Lorena Rodríguez-Gallego Silvana Masciadri Mariana Nin |
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| Institution: | 1.Sección Limnología, Instituto de Ecología y Ciencias Ambientales, Facultad de Ciencias—UdelaR,Montevideo,Uruguay;2.Vida Silvestre Uruguay,Montevideo,Uruguay |
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| Abstract: | Pollen studies and their relationship with modern vegetation facilitate paleoecological reconstructions while changes in pollen
abundance are indicators of environmental fluctuations. We analyzed the relationships between recent pollen deposits in the
sediments of four Uruguayan coastal lagoons and catchment vegetation and analyzed the temporal dynamics of submerged aquatic
vegetation (SAV). We mapped terrestrial vegetation, sampled SAV biomass, and analyzed the pollen record in each lagoon. The
sediment samples represented the last 49–76 years of deposition, and most vegetation types were well represented in the pollen
records. Pollen of Chenopodiaceae, proposed as indicators of saltmarshes, decreased in the surface samples of all lagoons,
possibly due to the salinity reduction promoted by precipitation changes in the region. Pollen of SAV was found in all lagoons
but with gaps in the record, and a submerged vegetated phase was recorded. Simultaneous botanical and pollen analyses better
captured the large fluctuations of SAV in coastal lagoons. |
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