Morphology, biostratigraphy, and evolution of PliocenePleistocene diatoms Proboscia barboi.
Proboscia barboi and Proboscia curvirostris are two important diatom biostratigraphic markers from the high latitudes of the North Pacific and North Atlantic Oceans, dating back to the Pliocene-Pleistocene time. This study analyzes the biostratigraphic events and describes the morphology of P. barbo...
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Universitat de Barcelona, Inst. Ciencies Terra Jaume Almera
2019
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Online Access: | http://hdl.handle.net/10400.1/13549 https://doi.org/10.1344/GeologicaActa2019.17.9 |
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ftunivalgarve:oai:sapientia.ualg.pt:10400.1/13549 2023-05-15T15:43:37+02:00 Morphology, biostratigraphy, and evolution of PliocenePleistocene diatoms Proboscia barboi. Andrade, J. Legoinha, P. Stroynowski, Zuzanna Abrantes, Fatima 2019 http://hdl.handle.net/10400.1/13549 https://doi.org/10.1344/GeologicaActa2019.17.9 eng eng Universitat de Barcelona, Inst. Ciencies Terra Jaume Almera info:eu-repo/grantAgreement/FCT/COMPETE/133013/PT info:eu-repo/grantAgreement/FCT/5876/147458/PT 1695-6133 http://hdl.handle.net/10400.1/13549 doi:10.1344/GeologicaActa2019.17.9 openAccess http://creativecommons.org/licenses/by/4.0/ CC-BY Probosciaceae Proboscis Longitudinal ridges Site U1340 Quaternary article 2019 ftunivalgarve https://doi.org/10.1344/GeologicaActa2019.17.9 2022-05-30T08:49:01Z Proboscia barboi and Proboscia curvirostris are two important diatom biostratigraphic markers from the high latitudes of the North Pacific and North Atlantic Oceans, dating back to the Pliocene-Pleistocene time. This study analyzes the biostratigraphic events and describes the morphology of P. barboi and P. curvirostris, particularly the morphologic variations of the latter species, based on observations of samples of Core U1340A from the IODP Expedition 323 in the Bering Sea. In Site U1340, the First Occurrence of P. curvirostris is observed at 1.52Ma and its First Common Occurrence at 1.39Ma, where morphologic variations were found abundantly. The Last Occurrence of P. curvirostris was found at 0.33Ma, while P. barboi's Last Occurrence is found at 0.67Ma. Based on the morphological similarity and known biostratigraphic distribution, previous authors have assumed that P. curvirostris descends from P. barboi, although this hypothesis is still in debate. At 1.39Ma P. curvirostris shows an increased size and thickness, which is typical of P. barboi, and some specimens display an incipient structure characteristic of P. curvirostris - the secondary spine. This morphology is intermediate between the two species and suggests an evolutionary transition from P. barboi to P. curvirostris. However, P. curvirostris already existed since 1.9Ma in the subarctic indicating that its speciation happened much earlier than 1.39Ma. Furthermore, since P. barboi co-occurs with P. curvirostris in the North Pacific, this evolutionary process was cladogenetic. Besides being evidence for a phylogenetic relationship, the abundant occurrence of intermediate forms at 1.39Ma may constitute a bioevent for a short time interval in the Bering Sea. info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Bering Sea North Atlantic Subarctic Universidade do Algarve: Sapienta Bering Sea Pacific Geologica Acta |
institution |
Open Polar |
collection |
Universidade do Algarve: Sapienta |
op_collection_id |
ftunivalgarve |
language |
English |
topic |
Probosciaceae Proboscis Longitudinal ridges Site U1340 Quaternary |
spellingShingle |
Probosciaceae Proboscis Longitudinal ridges Site U1340 Quaternary Andrade, J. Legoinha, P. Stroynowski, Zuzanna Abrantes, Fatima Morphology, biostratigraphy, and evolution of PliocenePleistocene diatoms Proboscia barboi. |
topic_facet |
Probosciaceae Proboscis Longitudinal ridges Site U1340 Quaternary |
description |
Proboscia barboi and Proboscia curvirostris are two important diatom biostratigraphic markers from the high latitudes of the North Pacific and North Atlantic Oceans, dating back to the Pliocene-Pleistocene time. This study analyzes the biostratigraphic events and describes the morphology of P. barboi and P. curvirostris, particularly the morphologic variations of the latter species, based on observations of samples of Core U1340A from the IODP Expedition 323 in the Bering Sea. In Site U1340, the First Occurrence of P. curvirostris is observed at 1.52Ma and its First Common Occurrence at 1.39Ma, where morphologic variations were found abundantly. The Last Occurrence of P. curvirostris was found at 0.33Ma, while P. barboi's Last Occurrence is found at 0.67Ma. Based on the morphological similarity and known biostratigraphic distribution, previous authors have assumed that P. curvirostris descends from P. barboi, although this hypothesis is still in debate. At 1.39Ma P. curvirostris shows an increased size and thickness, which is typical of P. barboi, and some specimens display an incipient structure characteristic of P. curvirostris - the secondary spine. This morphology is intermediate between the two species and suggests an evolutionary transition from P. barboi to P. curvirostris. However, P. curvirostris already existed since 1.9Ma in the subarctic indicating that its speciation happened much earlier than 1.39Ma. Furthermore, since P. barboi co-occurs with P. curvirostris in the North Pacific, this evolutionary process was cladogenetic. Besides being evidence for a phylogenetic relationship, the abundant occurrence of intermediate forms at 1.39Ma may constitute a bioevent for a short time interval in the Bering Sea. info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Andrade, J. Legoinha, P. Stroynowski, Zuzanna Abrantes, Fatima |
author_facet |
Andrade, J. Legoinha, P. Stroynowski, Zuzanna Abrantes, Fatima |
author_sort |
Andrade, J. |
title |
Morphology, biostratigraphy, and evolution of PliocenePleistocene diatoms Proboscia barboi. |
title_short |
Morphology, biostratigraphy, and evolution of PliocenePleistocene diatoms Proboscia barboi. |
title_full |
Morphology, biostratigraphy, and evolution of PliocenePleistocene diatoms Proboscia barboi. |
title_fullStr |
Morphology, biostratigraphy, and evolution of PliocenePleistocene diatoms Proboscia barboi. |
title_full_unstemmed |
Morphology, biostratigraphy, and evolution of PliocenePleistocene diatoms Proboscia barboi. |
title_sort |
morphology, biostratigraphy, and evolution of pliocenepleistocene diatoms proboscia barboi. |
publisher |
Universitat de Barcelona, Inst. Ciencies Terra Jaume Almera |
publishDate |
2019 |
url |
http://hdl.handle.net/10400.1/13549 https://doi.org/10.1344/GeologicaActa2019.17.9 |
geographic |
Bering Sea Pacific |
geographic_facet |
Bering Sea Pacific |
genre |
Bering Sea North Atlantic Subarctic |
genre_facet |
Bering Sea North Atlantic Subarctic |
op_relation |
info:eu-repo/grantAgreement/FCT/COMPETE/133013/PT info:eu-repo/grantAgreement/FCT/5876/147458/PT 1695-6133 http://hdl.handle.net/10400.1/13549 doi:10.1344/GeologicaActa2019.17.9 |
op_rights |
openAccess http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1344/GeologicaActa2019.17.9 |
container_title |
Geologica Acta |
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1766377807078752256 |