First records of Equisetites sp. (Equisetaceae) in quaternary sediments on the Bermejo River (Formosa, Argentina)
First records of Equisetites sp. (Equisetaceae) in quaternary sediments on the Bermejo River (Formosa, Argentina). The Chaco region is a vast sedimentary basin covered by Quaternary sediments. The vegetation changes from xeromorphic forest and thickets in the Western Chaco to semideciduous forest in...
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Sociedad Argentina de Botánica
2014
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Acceso en línea: | https://revistas.unc.edu.ar/index.php/BSAB/article/view/9469 |
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I10-R10-article-94692023-07-06T23:25:10Z First records of Equisetites sp. (Equisetaceae) in quaternary sediments on the Bermejo River (Formosa, Argentina) Primer registro de Equisetites sp. (Equisetaceae) en sedimentos cuaternarios del Río Bermejo (Formosa, Argentina) Contreras, Silvina A. Lutz, Alicia I Chaco Oriental Equisetites Holoceno Impresiones Eastern Chaco Equisetites Holocene Impressions. First records of Equisetites sp. (Equisetaceae) in quaternary sediments on the Bermejo River (Formosa, Argentina). The Chaco region is a vast sedimentary basin covered by Quaternary sediments. The vegetation changes from xeromorphic forest and thickets in the Western Chaco to semideciduous forest intermingled with extensive palm-savannas in the Eastern Chaco. In the Eastern Chaco, different Holocene impressions of plants appear in the banks of the Bermejo River (Villa Escolar, Formosa). Equisetites Sternberg. impressions occur in these sediments, and could prove useful to reconstruct the kind of past vegetation in the Eastern Chaco. We analyzed five morphological variables in a total of 12 fossil stems. The stems showed the typical articulation of Equisetaceae, with 9 to 16 carinals and 5 to 8 traces of lateral branches. Then, fossils were compared with the native extant species: E. bogotense H. B. K. and E. giganteum L. using multivariate methods. Due to their characteristics, the impressions showed a greater similarity to E. giganteum, being the first record of impressions for the Eastern Chaco region. The presence of this species showed that the environment in the recent past was humid like the present. La región Chaqueña es una vasta cuenca sedimentaria cubierta en su mayoría por sedimentos cuaternarios. Actualmente, su la vegetación cambia desde bosques xeromórficos y matorrales en el noroeste (Chaco Occidental), hasta bosques semideciduos, entremezclados con extensas sabanas y palmares en el sureste (Chaco Oriental). En el Chaco Oriental, en los sedimentos sobre las márgenes del río Bermejo, cercanos a Villa Escolar (Formosa), fueron encontradas distintas impresiones holocenas de restos vegetales cuyo análisis podría contribuir a reconstruir la vegetación del pasado del Chaco Oriental. En este contexto, se analizaron morfológicamente 12 impresiones de Equisetites sp. Las mismas presentan la articulación típica de las Equisetáceas, con un número variable de carenas (9 a 16) y trazas rameales (5 a 8) en los nudos. Las características observadas en las impresiones fueron comparadas con las de las especies nativas actuales (E. bogotense H. B. K. y E. giganteum L.) empleando métodos de análisis multivariado. A partir de los resultados obtenidos, las impresiones mostraron una mayor similitud con la especie E. giganteum. Este hallazgo constituye el primer registro de impresiones cuaternarias en la región del Chaco Oriental, sugiriendo que el ambiente del pasado reciente de la región fue húmedo como el actual. Sociedad Argentina de Botánica 2014-11-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículo original application/pdf https://revistas.unc.edu.ar/index.php/BSAB/article/view/9469 Boletín de la Sociedad Argentina de Botánica (Journal of the Argentine Botanical Society; Vol. 49 No. 3 (2014): Septiembre; 381-392 Boletín de la Sociedad Argentina de Botánica; Vol. 49 Núm. 3 (2014): Septiembre; 381-392 Boletín de la Sociedad Argentina de Botánica; v. 49 n. 3 (2014): Septiembre; 381-392 1851-2372 0373-580X 10.31055/1851.2372.v49.n3 spa https://revistas.unc.edu.ar/index.php/BSAB/article/view/9469/10207 |
institution |
Universidad Nacional de Córdoba |
institution_str |
I-10 |
repository_str |
R-10 |
container_title_str |
Revistas de la UNC |
language |
Español |
format |
Artículo revista |
topic |
Chaco Oriental Equisetites Holoceno Impresiones Eastern Chaco Equisetites Holocene Impressions. |
spellingShingle |
Chaco Oriental Equisetites Holoceno Impresiones Eastern Chaco Equisetites Holocene Impressions. Contreras, Silvina A. Lutz, Alicia I First records of Equisetites sp. (Equisetaceae) in quaternary sediments on the Bermejo River (Formosa, Argentina) |
topic_facet |
Chaco Oriental Equisetites Holoceno Impresiones Eastern Chaco Equisetites Holocene Impressions. |
author |
Contreras, Silvina A. Lutz, Alicia I |
author_facet |
Contreras, Silvina A. Lutz, Alicia I |
author_sort |
Contreras, Silvina A. |
title |
First records of Equisetites sp. (Equisetaceae) in quaternary sediments on the Bermejo River (Formosa, Argentina) |
title_short |
First records of Equisetites sp. (Equisetaceae) in quaternary sediments on the Bermejo River (Formosa, Argentina) |
title_full |
First records of Equisetites sp. (Equisetaceae) in quaternary sediments on the Bermejo River (Formosa, Argentina) |
title_fullStr |
First records of Equisetites sp. (Equisetaceae) in quaternary sediments on the Bermejo River (Formosa, Argentina) |
title_full_unstemmed |
First records of Equisetites sp. (Equisetaceae) in quaternary sediments on the Bermejo River (Formosa, Argentina) |
title_sort |
first records of equisetites sp. (equisetaceae) in quaternary sediments on the bermejo river (formosa, argentina) |
description |
First records of Equisetites sp. (Equisetaceae) in quaternary sediments on the Bermejo River (Formosa, Argentina). The Chaco region is a vast sedimentary basin covered by Quaternary sediments. The vegetation changes from xeromorphic forest and thickets in the Western Chaco to semideciduous forest intermingled with extensive palm-savannas in the Eastern Chaco. In the Eastern Chaco, different Holocene impressions of plants appear in the banks of the Bermejo River (Villa Escolar, Formosa). Equisetites Sternberg. impressions occur in these sediments, and could prove useful to reconstruct the kind of past vegetation in the Eastern Chaco. We analyzed five morphological variables in a total of 12 fossil stems. The stems showed the typical articulation of Equisetaceae, with 9 to 16 carinals and 5 to 8 traces of lateral branches. Then, fossils were compared with the native extant species: E. bogotense H. B. K. and E. giganteum L. using multivariate methods. Due to their characteristics, the impressions showed a greater similarity to E. giganteum, being the first record of impressions for the Eastern Chaco region. The presence of this species showed that the environment in the recent past was humid like the present. |
publisher |
Sociedad Argentina de Botánica |
publishDate |
2014 |
url |
https://revistas.unc.edu.ar/index.php/BSAB/article/view/9469 |
work_keys_str_mv |
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first_indexed |
2022-08-20T01:20:19Z |
last_indexed |
2023-07-07T00:13:00Z |
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