Morphology, biostratigraphy, and evolution of Pliocene-Pleistocene diatoms Proboscia barboi and Proboscia curvirostris
PEstC/MAR/LA0015/2013. 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...
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ftnewulisboa:oai:run.unl.pt:10362/100874 2023-05-15T15:43:38+02:00 Morphology, biostratigraphy, and evolution of Pliocene-Pleistocene diatoms Proboscia barboi and Proboscia curvirostris Andrade, João Legoinha, Paulo Stroynowski, Z. Abrantes, Fátima DCT - Departamento de Ciências da Terra GeoBioTec - Geobiociências, Geoengenharias e Geotecnologias 2019-10-22 17 http://hdl.handle.net/10362/100874 https://doi.org/10.1344/GeologicaActa2019.17.9 eng eng info:eu-repo/grantAgreement/FCT/5876/147458/PT 1695-6133 PURE: 15613081 PURE UUID: 6d4b65f1-9605-4a53-b795-5da6d65bf984 Scopus: 85078553893 WOS: 000509584700002 http://hdl.handle.net/10362/100874 https://doi.org/10.1344/GeologicaActa2019.17.9 openAccess Probosciaceae Proboscis Longitudinal ridges Site U1340 Quaternary article 2019 ftnewulisboa https://doi.org/10.1344/GeologicaActa2019.17.9 2022-05-01T14:12:18Z PEstC/MAR/LA0015/2013. 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. publishersversion published Article in Journal/Newspaper Bering Sea North Atlantic Subarctic Repositório da Universidade Nova de Lisboa (UNL) Bering Sea Pacific Geologica Acta |
institution |
Open Polar |
collection |
Repositório da Universidade Nova de Lisboa (UNL) |
op_collection_id |
ftnewulisboa |
language |
English |
topic |
Probosciaceae Proboscis Longitudinal ridges Site U1340 Quaternary |
spellingShingle |
Probosciaceae Proboscis Longitudinal ridges Site U1340 Quaternary Andrade, João Legoinha, Paulo Stroynowski, Z. Abrantes, Fátima Morphology, biostratigraphy, and evolution of Pliocene-Pleistocene diatoms Proboscia barboi and Proboscia curvirostris |
topic_facet |
Probosciaceae Proboscis Longitudinal ridges Site U1340 Quaternary |
description |
PEstC/MAR/LA0015/2013. 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. publishersversion published |
author2 |
DCT - Departamento de Ciências da Terra GeoBioTec - Geobiociências, Geoengenharias e Geotecnologias |
format |
Article in Journal/Newspaper |
author |
Andrade, João Legoinha, Paulo Stroynowski, Z. Abrantes, Fátima |
author_facet |
Andrade, João Legoinha, Paulo Stroynowski, Z. Abrantes, Fátima |
author_sort |
Andrade, João |
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 |
publishDate |
2019 |
url |
http://hdl.handle.net/10362/100874 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/5876/147458/PT 1695-6133 PURE: 15613081 PURE UUID: 6d4b65f1-9605-4a53-b795-5da6d65bf984 Scopus: 85078553893 WOS: 000509584700002 http://hdl.handle.net/10362/100874 https://doi.org/10.1344/GeologicaActa2019.17.9 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1344/GeologicaActa2019.17.9 |
container_title |
Geologica Acta |
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1766377819923808256 |