Non-pollen palynomorphs preserved in sedimentary archives of Lake Caldeirão, Azores: Fungal and algal remains as paleoecological indicators

Autor: Souto, M., Gonçalves, V., Ritter, C., Pla-Rabes, Sergi, Richter, N., Sáez, A., Bao, R., de Boer, E.J., Benavente-Marín, Mario, Hernández, Armand, Giralt, Santiago, Raposeiro, P. M.
Rok vydání: 2020
Předmět:
Zdroj: Digital.CSIC. Repositorio Institucional del CSIC
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Popis: XX Congress of the Iberian Association of Limnology (AIL-2020), Online Congress 26-29 October Murcia (Spain)
Non-Pollen Palynomorphs (NPPs) are sub-fossil remains from a wide range of organisms that can be sensitive to various ecological and/or anthropogenic factors. These microfossils include the remains of fungi, algae and invertebrates. Here we describe NPPs from the sedimentary record of Lake Caldeirão (Corvo Island, 400m a.s.l.), which spans the last two millennia. There are three successional NPP assemblages that track changes from a pristine ecosystem to an area severely altered by human activities. 1) The first assemblage includes diverse fungi wood saprophytes and mycorrhizae, indicating a pristine forest, and a set of aquatic fungal species associated with littoral plant communities. 2) This is followed by an increase in hyphomycetes conidia from decaying wood, and ascospores from the forest pathogen Kretzschmaria deusta. This assemblage also includes Glomeraceae, which is derived from a forested landscape that is disturbed by soil erosion and herbivores. The NPP assemblage points to the major transformation of the landscape from a forest to open grass and wetlands. 3) The most recent assemblage is dominated by ascospores of the coprophilous fungi (Podospora spp. and Sordariaceae) found in the faeces of pasturelivestock. This interpretation is supported by the presence of Lacunastrum and Desmodesmus, planktonic algae, which are associated with nutrient enrichment. The use of NPPs will improve palaeoenvironmental reconstructions from the Azores, although further studies of modern analogues are required to get a better understanding of the specific habitats associated with particular NPPs.
Databáze: OpenAIRE
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