Eocene Araucaria Sect. Eutactafrom Patagonia and floristic turnover during the initial isolation of South America
Premise Eocene floras of Patagonia document biotic response to the final separation of Gondwana. The conifer genus Araucaria , distributed worldwide during the Mesozoic, has a disjunct extant distribution between South America and Australasia. Fossils assigned to Australasian Araucaria Sect. Eutacta...
Published in: | American Journal of Botany |
---|---|
Main Authors: | , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2020
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/ajb2.1467 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ajb2.1467 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ajb2.1467 https://bsapubs.onlinelibrary.wiley.com/doi/am-pdf/10.1002/ajb2.1467 |
id |
crwiley:10.1002/ajb2.1467 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/ajb2.1467 2024-09-15T17:40:47+00:00 Eocene Araucaria Sect. Eutactafrom Patagonia and floristic turnover during the initial isolation of South America Rossetto‐Harris, Gabriella Wilf, Peter Escapa, Ignacio H. Andruchow‐Colombo, Ana National Science Foundation National Geographic Society 2020 http://dx.doi.org/10.1002/ajb2.1467 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ajb2.1467 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ajb2.1467 https://bsapubs.onlinelibrary.wiley.com/doi/am-pdf/10.1002/ajb2.1467 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor American Journal of Botany volume 107, issue 5, page 806-832 ISSN 0002-9122 1537-2197 journal-article 2020 crwiley https://doi.org/10.1002/ajb2.1467 2024-08-30T04:10:37Z Premise Eocene floras of Patagonia document biotic response to the final separation of Gondwana. The conifer genus Araucaria , distributed worldwide during the Mesozoic, has a disjunct extant distribution between South America and Australasia. Fossils assigned to Australasian Araucaria Sect. Eutacta usually are represented by isolated organs, making diagnosis difficult. Araucaria pichileufensis E.W. Berry, from the middle Eocene Río Pichileufú ( RP ) site in Argentine Patagonia, was originally placed in Sect. Eutacta and later reported from the early Eocene Laguna del Hunco ( LH ) locality. However, the relationship of A. pichileufensis to Sect. Eutacta and the conspecificity of the Araucaria material among these Patagonian floras have not been tested using modern methods. Methods We review the type material of A. pichileufensis alongside large ( n = 192) new fossil collections of Araucaria from LH and RP , including multi‐organ preservation of leafy branches, ovuliferous complexes, and pollen cones. We use a total evidence phylogenetic analysis to analyze relationships of the fossils to Sect. Eutacta . Results We describe Araucaria huncoensis sp. nov. from LH and improve the whole‐plant concept for Araucaria pichileufensis from RP . The two species respectively resolve in the crown and stem of Sect. Eutacta . Conclusions Our results confirm the presence and indicate the survival of Sect. Eutacta in South America during early Antarctic separation. The exceptionally complete fossils significantly predate several molecular age estimates for crown Eutacta . The differentiation of two Araucaria species demonstrates conifer turnover during climate change and initial South American isolation from the early to middle Eocene. Article in Journal/Newspaper Antarc* Antarctic Wiley Online Library American Journal of Botany 107 5 806 832 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Premise Eocene floras of Patagonia document biotic response to the final separation of Gondwana. The conifer genus Araucaria , distributed worldwide during the Mesozoic, has a disjunct extant distribution between South America and Australasia. Fossils assigned to Australasian Araucaria Sect. Eutacta usually are represented by isolated organs, making diagnosis difficult. Araucaria pichileufensis E.W. Berry, from the middle Eocene Río Pichileufú ( RP ) site in Argentine Patagonia, was originally placed in Sect. Eutacta and later reported from the early Eocene Laguna del Hunco ( LH ) locality. However, the relationship of A. pichileufensis to Sect. Eutacta and the conspecificity of the Araucaria material among these Patagonian floras have not been tested using modern methods. Methods We review the type material of A. pichileufensis alongside large ( n = 192) new fossil collections of Araucaria from LH and RP , including multi‐organ preservation of leafy branches, ovuliferous complexes, and pollen cones. We use a total evidence phylogenetic analysis to analyze relationships of the fossils to Sect. Eutacta . Results We describe Araucaria huncoensis sp. nov. from LH and improve the whole‐plant concept for Araucaria pichileufensis from RP . The two species respectively resolve in the crown and stem of Sect. Eutacta . Conclusions Our results confirm the presence and indicate the survival of Sect. Eutacta in South America during early Antarctic separation. The exceptionally complete fossils significantly predate several molecular age estimates for crown Eutacta . The differentiation of two Araucaria species demonstrates conifer turnover during climate change and initial South American isolation from the early to middle Eocene. |
author2 |
National Science Foundation National Geographic Society |
format |
Article in Journal/Newspaper |
author |
Rossetto‐Harris, Gabriella Wilf, Peter Escapa, Ignacio H. Andruchow‐Colombo, Ana |
spellingShingle |
Rossetto‐Harris, Gabriella Wilf, Peter Escapa, Ignacio H. Andruchow‐Colombo, Ana Eocene Araucaria Sect. Eutactafrom Patagonia and floristic turnover during the initial isolation of South America |
author_facet |
Rossetto‐Harris, Gabriella Wilf, Peter Escapa, Ignacio H. Andruchow‐Colombo, Ana |
author_sort |
Rossetto‐Harris, Gabriella |
title |
Eocene Araucaria Sect. Eutactafrom Patagonia and floristic turnover during the initial isolation of South America |
title_short |
Eocene Araucaria Sect. Eutactafrom Patagonia and floristic turnover during the initial isolation of South America |
title_full |
Eocene Araucaria Sect. Eutactafrom Patagonia and floristic turnover during the initial isolation of South America |
title_fullStr |
Eocene Araucaria Sect. Eutactafrom Patagonia and floristic turnover during the initial isolation of South America |
title_full_unstemmed |
Eocene Araucaria Sect. Eutactafrom Patagonia and floristic turnover during the initial isolation of South America |
title_sort |
eocene araucaria sect. eutactafrom patagonia and floristic turnover during the initial isolation of south america |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/ajb2.1467 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ajb2.1467 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ajb2.1467 https://bsapubs.onlinelibrary.wiley.com/doi/am-pdf/10.1002/ajb2.1467 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
American Journal of Botany volume 107, issue 5, page 806-832 ISSN 0002-9122 1537-2197 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ajb2.1467 |
container_title |
American Journal of Botany |
container_volume |
107 |
container_issue |
5 |
container_start_page |
806 |
op_container_end_page |
832 |
_version_ |
1810486809605439488 |