The role of abrupt climate change in the formation of an open vegetation enclave in northern Amazonia during the late Quaternary
The effects of climate changes on biotic expansion or divergence is a widely debated topic. This discussion is particularly relevant for northern Amazonia where patches of open vegetation environments that harbor high endemic and specialized species are present in a matrix of tall closed canopy fore...
| Autor principal: | Zular, André |
|---|---|
| Outros Autores: | Sawakuchi, André Oliveira, Chiessi, Cristiano Mazur, D'Horta, Fernando Mendonça, Cruz, Francisco W., Dematt?, José Alexandre Melo, Ribas, Camila Cherem, Hartmann, Gelvam A., Giannini, Paulo César Fonseca, Soares, Emílio Alberto Amaral |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Global and Planetary Change
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/16795 |
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oai:repositorio:1-16795 |
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oai:repositorio:1-16795 The role of abrupt climate change in the formation of an open vegetation enclave in northern Amazonia during the late Quaternary Zular, André Sawakuchi, André Oliveira Chiessi, Cristiano Mazur D'Horta, Fernando Mendonça Cruz, Francisco W. Dematt?, José Alexandre Melo Ribas, Camila Cherem Hartmann, Gelvam A. Giannini, Paulo César Fonseca Soares, Emílio Alberto Amaral Deposition Forestry Glacial Geology Luminescence Magnetic Susceptibility Vegetation Abrupt Climate Change Amazon Forests Heinrich Stadial 1 Intertropical Convergence Zone Last Glacial Maximum Optically Stimulated Luminescence Reflectance Analysis Vegetation Environments Climate Change Canopy Climate Change Climate Effect Depositional Environment Divergence Endemic Species Heinrich Event Intertropical Convergence Zone Landscape Ecology Last Glacial Maximum Quaternary Radiocarbon Dating Southern Hemisphere Vegetation Cover Amazonia The effects of climate changes on biotic expansion or divergence is a widely debated topic. This discussion is particularly relevant for northern Amazonia where patches of open vegetation environments that harbor high endemic and specialized species are present in a matrix of tall closed canopy forest. This paper presents the depositional chronology and evolution of an 8.7-m thick stabilized fluvial and eolian sediment profile in a sandy plain substrate that underpins the largest open vegetation enclave in northern Amazonia. Three depositional units were identified using optically stimulated luminescence and radiocarbon ages coupled with grain size, magnetic susceptibility, and reflectance analyses. A lower unit of coarse fluvial silt deposited between 53 and 28 ka is overlain unconformably by a 5-m thick middle unit of fine eolian sand deposited at high accumulation rates between the Last Glacial Maximum (23–19 ka) and Heinrich Stadial 1 (HS1; 18.1–14.7 ka) when persistent and long-lasting shifts of the Intertropical Convergence Zone (ITCZ) to the Southern Hemisphere promoted dry and windy conditions in northern South America. An upper ~2-m thick unit was deposited when the climate became wetter after HS1, promoting the formation of soils that support open vegetation habitats. This study indicates that abrupt millennial-scale climate events can induce significant changes in the Amazonian landscape, which in turn play an essential role in the distribution and diversification of specialized biota. © 2018 Elsevier B.V. 2020-06-15T21:36:22Z 2020-06-15T21:36:22Z 2019 Artigo https://repositorio.inpa.gov.br/handle/1/16795 10.1016/j.gloplacha.2018.09.006 en Volume 172, Pags. 140-149 Restrito Global and Planetary Change |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Deposition Forestry Glacial Geology Luminescence Magnetic Susceptibility Vegetation Abrupt Climate Change Amazon Forests Heinrich Stadial 1 Intertropical Convergence Zone Last Glacial Maximum Optically Stimulated Luminescence Reflectance Analysis Vegetation Environments Climate Change Canopy Climate Change Climate Effect Depositional Environment Divergence Endemic Species Heinrich Event Intertropical Convergence Zone Landscape Ecology Last Glacial Maximum Quaternary Radiocarbon Dating Southern Hemisphere Vegetation Cover Amazonia |
| spellingShingle |
Deposition Forestry Glacial Geology Luminescence Magnetic Susceptibility Vegetation Abrupt Climate Change Amazon Forests Heinrich Stadial 1 Intertropical Convergence Zone Last Glacial Maximum Optically Stimulated Luminescence Reflectance Analysis Vegetation Environments Climate Change Canopy Climate Change Climate Effect Depositional Environment Divergence Endemic Species Heinrich Event Intertropical Convergence Zone Landscape Ecology Last Glacial Maximum Quaternary Radiocarbon Dating Southern Hemisphere Vegetation Cover Amazonia Zular, André The role of abrupt climate change in the formation of an open vegetation enclave in northern Amazonia during the late Quaternary |
| topic_facet |
Deposition Forestry Glacial Geology Luminescence Magnetic Susceptibility Vegetation Abrupt Climate Change Amazon Forests Heinrich Stadial 1 Intertropical Convergence Zone Last Glacial Maximum Optically Stimulated Luminescence Reflectance Analysis Vegetation Environments Climate Change Canopy Climate Change Climate Effect Depositional Environment Divergence Endemic Species Heinrich Event Intertropical Convergence Zone Landscape Ecology Last Glacial Maximum Quaternary Radiocarbon Dating Southern Hemisphere Vegetation Cover Amazonia |
| description |
The effects of climate changes on biotic expansion or divergence is a widely debated topic. This discussion is particularly relevant for northern Amazonia where patches of open vegetation environments that harbor high endemic and specialized species are present in a matrix of tall closed canopy forest. This paper presents the depositional chronology and evolution of an 8.7-m thick stabilized fluvial and eolian sediment profile in a sandy plain substrate that underpins the largest open vegetation enclave in northern Amazonia. Three depositional units were identified using optically stimulated luminescence and radiocarbon ages coupled with grain size, magnetic susceptibility, and reflectance analyses. A lower unit of coarse fluvial silt deposited between 53 and 28 ka is overlain unconformably by a 5-m thick middle unit of fine eolian sand deposited at high accumulation rates between the Last Glacial Maximum (23–19 ka) and Heinrich Stadial 1 (HS1; 18.1–14.7 ka) when persistent and long-lasting shifts of the Intertropical Convergence Zone (ITCZ) to the Southern Hemisphere promoted dry and windy conditions in northern South America. An upper ~2-m thick unit was deposited when the climate became wetter after HS1, promoting the formation of soils that support open vegetation habitats. This study indicates that abrupt millennial-scale climate events can induce significant changes in the Amazonian landscape, which in turn play an essential role in the distribution and diversification of specialized biota. © 2018 Elsevier B.V. |
| format |
Artigo |
| author |
Zular, André |
| author2 |
Sawakuchi, André Oliveira Chiessi, Cristiano Mazur D'Horta, Fernando Mendonça Cruz, Francisco W. Dematt?, José Alexandre Melo Ribas, Camila Cherem Hartmann, Gelvam A. Giannini, Paulo César Fonseca Soares, Emílio Alberto Amaral |
| author2Str |
Sawakuchi, André Oliveira Chiessi, Cristiano Mazur D'Horta, Fernando Mendonça Cruz, Francisco W. Dematt?, José Alexandre Melo Ribas, Camila Cherem Hartmann, Gelvam A. Giannini, Paulo César Fonseca Soares, Emílio Alberto Amaral |
| title |
The role of abrupt climate change in the formation of an open vegetation enclave in northern Amazonia during the late Quaternary |
| title_short |
The role of abrupt climate change in the formation of an open vegetation enclave in northern Amazonia during the late Quaternary |
| title_full |
The role of abrupt climate change in the formation of an open vegetation enclave in northern Amazonia during the late Quaternary |
| title_fullStr |
The role of abrupt climate change in the formation of an open vegetation enclave in northern Amazonia during the late Quaternary |
| title_full_unstemmed |
The role of abrupt climate change in the formation of an open vegetation enclave in northern Amazonia during the late Quaternary |
| title_sort |
role of abrupt climate change in the formation of an open vegetation enclave in northern amazonia during the late quaternary |
| publisher |
Global and Planetary Change |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/16795 |
| _version_ |
1787143732842201088 |
| score |
11.755432 |