Morphology, biostratigraphy, and evolution of Pliocene-Pleistocene diatoms Proboscia barboi and Proboscia curvirostris
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 (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB)
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ftdoajarticles:oai:doaj.org/article:29b31d40311d4045804ab70120ae009c 2023-11-12T04:15:19+01:00 Morphology, biostratigraphy, and evolution of Pliocene-Pleistocene diatoms Proboscia barboi and Proboscia curvirostris J.P. Andrade P. Legoinha Z. Stroynowski F. Abrantes 2019-10-01T00:00:00Z https://doaj.org/article/29b31d40311d4045804ab70120ae009c EN eng Universitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB) https://revistes.ub.edu/index.php/GEOACTA/article/view/22649 https://doaj.org/toc/1696-5728 1696-5728 https://doaj.org/article/29b31d40311d4045804ab70120ae009c Geologica Acta, Vol 17 (2019) Probosciaceae Proboscis Longitudinal ridges Site U1340 Quaternary Science Q Geology QE1-996.5 article 2019 ftdoajarticles 2023-10-22T00:36:06Z 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. Article in Journal/Newspaper Bering Sea North Atlantic Subarctic Directory of Open Access Journals: DOAJ Articles Bering Sea Pacific |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Probosciaceae Proboscis Longitudinal ridges Site U1340 Quaternary Science Q Geology QE1-996.5 |
spellingShingle |
Probosciaceae Proboscis Longitudinal ridges Site U1340 Quaternary Science Q Geology QE1-996.5 J.P. Andrade P. Legoinha Z. Stroynowski F. Abrantes Morphology, biostratigraphy, and evolution of Pliocene-Pleistocene diatoms Proboscia barboi and Proboscia curvirostris |
topic_facet |
Probosciaceae Proboscis Longitudinal ridges Site U1340 Quaternary Science Q Geology QE1-996.5 |
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. |
format |
Article in Journal/Newspaper |
author |
J.P. Andrade P. Legoinha Z. Stroynowski F. Abrantes |
author_facet |
J.P. Andrade P. Legoinha Z. Stroynowski F. Abrantes |
author_sort |
J.P. Andrade |
title |
Morphology, biostratigraphy, and evolution of Pliocene-Pleistocene diatoms Proboscia barboi and Proboscia curvirostris |
title_short |
Morphology, biostratigraphy, and evolution of Pliocene-Pleistocene diatoms Proboscia barboi and Proboscia curvirostris |
title_full |
Morphology, biostratigraphy, and evolution of Pliocene-Pleistocene diatoms Proboscia barboi and Proboscia curvirostris |
title_fullStr |
Morphology, biostratigraphy, and evolution of Pliocene-Pleistocene diatoms Proboscia barboi and Proboscia curvirostris |
title_full_unstemmed |
Morphology, biostratigraphy, and evolution of Pliocene-Pleistocene diatoms Proboscia barboi and Proboscia curvirostris |
title_sort |
morphology, biostratigraphy, and evolution of pliocene-pleistocene diatoms proboscia barboi and proboscia curvirostris |
publisher |
Universitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB) |
publishDate |
2019 |
url |
https://doaj.org/article/29b31d40311d4045804ab70120ae009c |
geographic |
Bering Sea Pacific |
geographic_facet |
Bering Sea Pacific |
genre |
Bering Sea North Atlantic Subarctic |
genre_facet |
Bering Sea North Atlantic Subarctic |
op_source |
Geologica Acta, Vol 17 (2019) |
op_relation |
https://revistes.ub.edu/index.php/GEOACTA/article/view/22649 https://doaj.org/toc/1696-5728 1696-5728 https://doaj.org/article/29b31d40311d4045804ab70120ae009c |
_version_ |
1782332639110234112 |