Fragilariopsis Diatom Evolution in Pliocene and Pleistocene Antarctic Shelf Sediments
The late Pliocene – early Pleistocene sediment record in the AND-1B core from the McMurdo Sound, Ross Sea, Antarctica, displays a rich diversity and high abundance of diatoms, including several new morphologies within the genus Fragilariopsis. These new morphologies exhibit similarities to the extin...
Main Authors: | , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
DigitalCommons@University of Nebraska - Lincoln
2012
|
Subjects: | |
Online Access: | https://digitalcommons.unl.edu/andrillrespub/65 https://digitalcommons.unl.edu/context/andrillrespub/article/1065/viewcontent/Sjunneskog_MP_2012_Fragilariopsis_diatom_evolution.pdf |
id |
ftunivnebraskali:oai:digitalcommons.unl.edu:andrillrespub-1065 |
---|---|
record_format |
openpolar |
spelling |
ftunivnebraskali:oai:digitalcommons.unl.edu:andrillrespub-1065 2023-11-12T04:04:25+01:00 Fragilariopsis Diatom Evolution in Pliocene and Pleistocene Antarctic Shelf Sediments Sjunneskog, Charlotte Riesselman, Christina R. Winter, Diane Scherer, Reed 2012-01-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/andrillrespub/65 https://digitalcommons.unl.edu/context/andrillrespub/article/1065/viewcontent/Sjunneskog_MP_2012_Fragilariopsis_diatom_evolution.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/andrillrespub/65 https://digitalcommons.unl.edu/context/andrillrespub/article/1065/viewcontent/Sjunneskog_MP_2012_Fragilariopsis_diatom_evolution.pdf ANDRILL Research and Publications Fragilariopsis Pliocene Ross Sea Antarctica ANDRILL sea ice Oceanography Paleobiology text 2012 ftunivnebraskali 2023-10-30T11:18:57Z The late Pliocene – early Pleistocene sediment record in the AND-1B core from the McMurdo Sound, Ross Sea, Antarctica, displays a rich diversity and high abundance of diatoms, including several new morphologies within the genus Fragilariopsis. These new morphologies exhibit similarities to the extinct late Miocene/early Pliocene species Fragilariopsis aurica Gersonde and Fragilariopsis praecurta Gersonde, as well as to the modern sea ice-associated species Fragilariopsis ritscheri Hustedt and Fragilariopsis obliquecostata van Heurck. From the diverse morphologies present, we use light microscopy and scanning electron microscopy to identify and describe the characteristics of three new taxa, Fragilariopsis laqueata Riesselman, Fragilariopsis bohatyi Sjunneskog et Riesselman, and Fragilariopsis robusta Sjunneskog, which are common in the diatom-bearing intervals from ~3.2 to 1.95 Ma. Comparisons with extant and extinct species are made to assess possible environmental affinities, evolutionary relationships, and potential for future biostratigraphic utility. This complex of newmorphologies diversified as conditions cooled during the Pliocene, then went into decline as heavy sea ice conditions of the Pleistocene were established. Only the lineage of F. robusta appears to continue into the late Pleistocene, where it is interpreted to have evolved into F. obliquecostata. Text Antarc* Antarctic Antarctica McMurdo Sound Ross Sea Sea ice University of Nebraska-Lincoln: DigitalCommons@UNL Antarctic McMurdo Sound Ross Sea |
institution |
Open Polar |
collection |
University of Nebraska-Lincoln: DigitalCommons@UNL |
op_collection_id |
ftunivnebraskali |
language |
unknown |
topic |
Fragilariopsis Pliocene Ross Sea Antarctica ANDRILL sea ice Oceanography Paleobiology |
spellingShingle |
Fragilariopsis Pliocene Ross Sea Antarctica ANDRILL sea ice Oceanography Paleobiology Sjunneskog, Charlotte Riesselman, Christina R. Winter, Diane Scherer, Reed Fragilariopsis Diatom Evolution in Pliocene and Pleistocene Antarctic Shelf Sediments |
topic_facet |
Fragilariopsis Pliocene Ross Sea Antarctica ANDRILL sea ice Oceanography Paleobiology |
description |
The late Pliocene – early Pleistocene sediment record in the AND-1B core from the McMurdo Sound, Ross Sea, Antarctica, displays a rich diversity and high abundance of diatoms, including several new morphologies within the genus Fragilariopsis. These new morphologies exhibit similarities to the extinct late Miocene/early Pliocene species Fragilariopsis aurica Gersonde and Fragilariopsis praecurta Gersonde, as well as to the modern sea ice-associated species Fragilariopsis ritscheri Hustedt and Fragilariopsis obliquecostata van Heurck. From the diverse morphologies present, we use light microscopy and scanning electron microscopy to identify and describe the characteristics of three new taxa, Fragilariopsis laqueata Riesselman, Fragilariopsis bohatyi Sjunneskog et Riesselman, and Fragilariopsis robusta Sjunneskog, which are common in the diatom-bearing intervals from ~3.2 to 1.95 Ma. Comparisons with extant and extinct species are made to assess possible environmental affinities, evolutionary relationships, and potential for future biostratigraphic utility. This complex of newmorphologies diversified as conditions cooled during the Pliocene, then went into decline as heavy sea ice conditions of the Pleistocene were established. Only the lineage of F. robusta appears to continue into the late Pleistocene, where it is interpreted to have evolved into F. obliquecostata. |
format |
Text |
author |
Sjunneskog, Charlotte Riesselman, Christina R. Winter, Diane Scherer, Reed |
author_facet |
Sjunneskog, Charlotte Riesselman, Christina R. Winter, Diane Scherer, Reed |
author_sort |
Sjunneskog, Charlotte |
title |
Fragilariopsis Diatom Evolution in Pliocene and Pleistocene Antarctic Shelf Sediments |
title_short |
Fragilariopsis Diatom Evolution in Pliocene and Pleistocene Antarctic Shelf Sediments |
title_full |
Fragilariopsis Diatom Evolution in Pliocene and Pleistocene Antarctic Shelf Sediments |
title_fullStr |
Fragilariopsis Diatom Evolution in Pliocene and Pleistocene Antarctic Shelf Sediments |
title_full_unstemmed |
Fragilariopsis Diatom Evolution in Pliocene and Pleistocene Antarctic Shelf Sediments |
title_sort |
fragilariopsis diatom evolution in pliocene and pleistocene antarctic shelf sediments |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2012 |
url |
https://digitalcommons.unl.edu/andrillrespub/65 https://digitalcommons.unl.edu/context/andrillrespub/article/1065/viewcontent/Sjunneskog_MP_2012_Fragilariopsis_diatom_evolution.pdf |
geographic |
Antarctic McMurdo Sound Ross Sea |
geographic_facet |
Antarctic McMurdo Sound Ross Sea |
genre |
Antarc* Antarctic Antarctica McMurdo Sound Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Antarctica McMurdo Sound Ross Sea Sea ice |
op_source |
ANDRILL Research and Publications |
op_relation |
https://digitalcommons.unl.edu/andrillrespub/65 https://digitalcommons.unl.edu/context/andrillrespub/article/1065/viewcontent/Sjunneskog_MP_2012_Fragilariopsis_diatom_evolution.pdf |
_version_ |
1782341611353538560 |