Integrated reconstruction of Holocene millennial-scale environmental changes in Tierra del Fuego, southernmost South America
This study presents new paleoenvironmental data obtained from sedimentary cores from Lago Fagnano, an elongated lake located at 54°S in southernmost South America. Data from palynomorphs (pollen, spores and algae) and associated palynofacies as well as from diatom taxa retrieved from these cores com...
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todo:paper_00310182_v399_n_p294_Waldmann2023-10-03T14:40:56Z Integrated reconstruction of Holocene millennial-scale environmental changes in Tierra del Fuego, southernmost South America Waldmann, N. Borromei, A.M. Recasens, C. Olivera, D. Martínez, M.A. Maidana, N.I. Ariztegui, D. Austin, J.A. Anselmetti, F.S. Moy, C.M. Lacustrine sediments Limnogeology Multi-proxy analyses Paleoenvironment and Paleoclimate reconstruction Palynology Southern Hemisphere Westerlies colonization environmental change Holocene lacustrine deposit paleoclimate paleoenvironment paleolimnology palynology proxy climate record reconstruction sediment core Southern Hemisphere vegetation history Tierra del Fuego [(ARC) South America] algae Bacillariophyta Bacteria (microorganisms) Nothofagus This study presents new paleoenvironmental data obtained from sedimentary cores from Lago Fagnano, an elongated lake located at 54°S in southernmost South America. Data from palynomorphs (pollen, spores and algae) and associated palynofacies as well as from diatom taxa retrieved from these cores compared with other regional proxies contribute to evaluate the similarities and differences in the climate patterns based on different proxies from southernmost Patagonia. The pollen analysis reveals that a grass steppe environment existed during the early Holocene (11,300-~. 8000. cal. a. BP) followed by a major vegetation change characterized by development of forest-steppe ecotone communities between ~. 8000 and ~. 6500. cal. a. BP, under more humid conditions. Between ~. 6500 and ~. 4000. cal. a. BP, expansion and colonization by Nothofagus forests reflect an increase in effective moisture levels, while openness in the forest communities characterizes the region after ~. 1100. cal. a. BP. The palynological organic matter combined with the algal content reflects hydrological changes occurring in the lake and its nutrient status, probably in close relation with past climate oscillations. All these past ecological changes are closely related to oscillations in precipitation and temperature as a response to the variations in the latitudinal position and/or strength of the Southern Westerlies wind belt during the Holocene. © 2014 Elsevier B.V. Fil:Maidana, N.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00310182_v399_n_p294_Waldmann |
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Universidad de Buenos Aires |
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I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Lacustrine sediments Limnogeology Multi-proxy analyses Paleoenvironment and Paleoclimate reconstruction Palynology Southern Hemisphere Westerlies colonization environmental change Holocene lacustrine deposit paleoclimate paleoenvironment paleolimnology palynology proxy climate record reconstruction sediment core Southern Hemisphere vegetation history Tierra del Fuego [(ARC) South America] algae Bacillariophyta Bacteria (microorganisms) Nothofagus |
| spellingShingle |
Lacustrine sediments Limnogeology Multi-proxy analyses Paleoenvironment and Paleoclimate reconstruction Palynology Southern Hemisphere Westerlies colonization environmental change Holocene lacustrine deposit paleoclimate paleoenvironment paleolimnology palynology proxy climate record reconstruction sediment core Southern Hemisphere vegetation history Tierra del Fuego [(ARC) South America] algae Bacillariophyta Bacteria (microorganisms) Nothofagus Waldmann, N. Borromei, A.M. Recasens, C. Olivera, D. Martínez, M.A. Maidana, N.I. Ariztegui, D. Austin, J.A. Anselmetti, F.S. Moy, C.M. Integrated reconstruction of Holocene millennial-scale environmental changes in Tierra del Fuego, southernmost South America |
| topic_facet |
Lacustrine sediments Limnogeology Multi-proxy analyses Paleoenvironment and Paleoclimate reconstruction Palynology Southern Hemisphere Westerlies colonization environmental change Holocene lacustrine deposit paleoclimate paleoenvironment paleolimnology palynology proxy climate record reconstruction sediment core Southern Hemisphere vegetation history Tierra del Fuego [(ARC) South America] algae Bacillariophyta Bacteria (microorganisms) Nothofagus |
| description |
This study presents new paleoenvironmental data obtained from sedimentary cores from Lago Fagnano, an elongated lake located at 54°S in southernmost South America. Data from palynomorphs (pollen, spores and algae) and associated palynofacies as well as from diatom taxa retrieved from these cores compared with other regional proxies contribute to evaluate the similarities and differences in the climate patterns based on different proxies from southernmost Patagonia. The pollen analysis reveals that a grass steppe environment existed during the early Holocene (11,300-~. 8000. cal. a. BP) followed by a major vegetation change characterized by development of forest-steppe ecotone communities between ~. 8000 and ~. 6500. cal. a. BP, under more humid conditions. Between ~. 6500 and ~. 4000. cal. a. BP, expansion and colonization by Nothofagus forests reflect an increase in effective moisture levels, while openness in the forest communities characterizes the region after ~. 1100. cal. a. BP. The palynological organic matter combined with the algal content reflects hydrological changes occurring in the lake and its nutrient status, probably in close relation with past climate oscillations. All these past ecological changes are closely related to oscillations in precipitation and temperature as a response to the variations in the latitudinal position and/or strength of the Southern Westerlies wind belt during the Holocene. © 2014 Elsevier B.V. |
| format |
JOUR |
| author |
Waldmann, N. Borromei, A.M. Recasens, C. Olivera, D. Martínez, M.A. Maidana, N.I. Ariztegui, D. Austin, J.A. Anselmetti, F.S. Moy, C.M. |
| author_facet |
Waldmann, N. Borromei, A.M. Recasens, C. Olivera, D. Martínez, M.A. Maidana, N.I. Ariztegui, D. Austin, J.A. Anselmetti, F.S. Moy, C.M. |
| author_sort |
Waldmann, N. |
| title |
Integrated reconstruction of Holocene millennial-scale environmental changes in Tierra del Fuego, southernmost South America |
| title_short |
Integrated reconstruction of Holocene millennial-scale environmental changes in Tierra del Fuego, southernmost South America |
| title_full |
Integrated reconstruction of Holocene millennial-scale environmental changes in Tierra del Fuego, southernmost South America |
| title_fullStr |
Integrated reconstruction of Holocene millennial-scale environmental changes in Tierra del Fuego, southernmost South America |
| title_full_unstemmed |
Integrated reconstruction of Holocene millennial-scale environmental changes in Tierra del Fuego, southernmost South America |
| title_sort |
integrated reconstruction of holocene millennial-scale environmental changes in tierra del fuego, southernmost south america |
| url |
http://hdl.handle.net/20.500.12110/paper_00310182_v399_n_p294_Waldmann |
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