Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift
The Patagonian steppe - a massive rain-shadow on the lee side of the southern Andes - is assumed to have evolved ∼15-12ǎ €‰Myr as a consequence of the southern Andean uplift. However, fossil evidence supporting this assumption is limited. Here we quantitatively estimate climatic conditions and plant...
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todo:paper_20411723_v5_n_p_Palazzesi2023-10-03T16:37:51Z Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift Palazzesi, L. Barreda, V.D. Cuitiño, J.I. Guler, M.V. Tellería, M.C. Ventura Santos, R. bioclimatology desertification fossil record paleoecology pollen precipitation (climatology) quantitative analysis species richness steppe uplift article Cyperaceae desertification fern flora fossil fossil pollen grain latitude Malpighiaceae nonhuman paleoclimate plant precipitation Prosopis shrub soil species temperature tree Upper Miocene Andes Patagonia Argentina Climate Desert Climate Fossils Phylogeny Pollen Temperature The Patagonian steppe - a massive rain-shadow on the lee side of the southern Andes - is assumed to have evolved ∼15-12ǎ €‰Myr as a consequence of the southern Andean uplift. However, fossil evidence supporting this assumption is limited. Here we quantitatively estimate climatic conditions and plant richness for the interval ∼10-6ǎ €‰Myr based on the study and bioclimatic analysis of terrestrially derived spore-pollen assemblages preserved in well-constrained Patagonian marine deposits. Our analyses indicate a mesothermal climate, with mean temperatures of the coldest quarter between 11.4ǎ €‰°C and 16.9ǎ €‰°C (presently ∼3.5ǎ €‰°C) and annual precipitation rarely below 661ǎ €‰mm (presently ∼200ǎ €‰mm). Rarefied richness reveals a significantly more diverse flora during the late Miocene than today at the same latitude but comparable with that approximately 2,000ǎ €‰km further northeast at mid-latitudes on the Brazilian coast. We infer that the Patagonian desertification was not solely a consequence of the Andean uplift as previously insinuated.© 2014 Macmillan Publishers Limited. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_20411723_v5_n_p_Palazzesi |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
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R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
bioclimatology desertification fossil record paleoecology pollen precipitation (climatology) quantitative analysis species richness steppe uplift article Cyperaceae desertification fern flora fossil fossil pollen grain latitude Malpighiaceae nonhuman paleoclimate plant precipitation Prosopis shrub soil species temperature tree Upper Miocene Andes Patagonia Argentina Climate Desert Climate Fossils Phylogeny Pollen Temperature |
| spellingShingle |
bioclimatology desertification fossil record paleoecology pollen precipitation (climatology) quantitative analysis species richness steppe uplift article Cyperaceae desertification fern flora fossil fossil pollen grain latitude Malpighiaceae nonhuman paleoclimate plant precipitation Prosopis shrub soil species temperature tree Upper Miocene Andes Patagonia Argentina Climate Desert Climate Fossils Phylogeny Pollen Temperature Palazzesi, L. Barreda, V.D. Cuitiño, J.I. Guler, M.V. Tellería, M.C. Ventura Santos, R. Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift |
| topic_facet |
bioclimatology desertification fossil record paleoecology pollen precipitation (climatology) quantitative analysis species richness steppe uplift article Cyperaceae desertification fern flora fossil fossil pollen grain latitude Malpighiaceae nonhuman paleoclimate plant precipitation Prosopis shrub soil species temperature tree Upper Miocene Andes Patagonia Argentina Climate Desert Climate Fossils Phylogeny Pollen Temperature |
| description |
The Patagonian steppe - a massive rain-shadow on the lee side of the southern Andes - is assumed to have evolved ∼15-12ǎ €‰Myr as a consequence of the southern Andean uplift. However, fossil evidence supporting this assumption is limited. Here we quantitatively estimate climatic conditions and plant richness for the interval ∼10-6ǎ €‰Myr based on the study and bioclimatic analysis of terrestrially derived spore-pollen assemblages preserved in well-constrained Patagonian marine deposits. Our analyses indicate a mesothermal climate, with mean temperatures of the coldest quarter between 11.4ǎ €‰°C and 16.9ǎ €‰°C (presently ∼3.5ǎ €‰°C) and annual precipitation rarely below 661ǎ €‰mm (presently ∼200ǎ €‰mm). Rarefied richness reveals a significantly more diverse flora during the late Miocene than today at the same latitude but comparable with that approximately 2,000ǎ €‰km further northeast at mid-latitudes on the Brazilian coast. We infer that the Patagonian desertification was not solely a consequence of the Andean uplift as previously insinuated.© 2014 Macmillan Publishers Limited. All rights reserved. |
| format |
JOUR |
| author |
Palazzesi, L. Barreda, V.D. Cuitiño, J.I. Guler, M.V. Tellería, M.C. Ventura Santos, R. |
| author_facet |
Palazzesi, L. Barreda, V.D. Cuitiño, J.I. Guler, M.V. Tellería, M.C. Ventura Santos, R. |
| author_sort |
Palazzesi, L. |
| title |
Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift |
| title_short |
Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift |
| title_full |
Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift |
| title_fullStr |
Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift |
| title_full_unstemmed |
Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift |
| title_sort |
fossil pollen records indicate that patagonian desertification was not solely a consequence of andean uplift |
| url |
http://hdl.handle.net/20.500.12110/paper_20411723_v5_n_p_Palazzesi |
| work_keys_str_mv |
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