Biogeographic differentiation between two morphotypes of the Southern Ocean diatom Fragilariopsis kerguelensis
Fragilariopsis kerguelensis (O’ Meara) Hust. is a ubiquitous diatom of the Southern Ocean. Its thick frustules are the numerically dominant component of the siliceous sediment layer covering large parts of the seafloor beneath. Morphometric variability of frustules of this diatom has been of interes...
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ftawi:oai:epic.awi.de:52334 2023-05-15T13:45:22+02:00 Biogeographic differentiation between two morphotypes of the Southern Ocean diatom Fragilariopsis kerguelensis Glemser, Barbara Kloster, Michael Esper, Oliver Eggers, S. L. Kauer, Gerhard Beszteri, Bank 2019 https://epic.awi.de/id/eprint/52334/ https://hdl.handle.net/10013/epic.5834be42-3012-4825-9a63-77fb839e4796 unknown SPRINGER Glemser, B. , Kloster, M. orcid:0000-0001-9244-4925 , Esper, O. orcid:0000-0002-4342-3471 , Eggers, S. L. , Kauer, G. and Beszteri, B. orcid:0000-0002-6852-1588 (2019) Biogeographic differentiation between two morphotypes of the Southern Ocean diatom Fragilariopsis kerguelensis , Polar Biology, 42 , pp. 1369-1376 . doi:10.1007/s00300-019-02525-0 <https://doi.org/10.1007/s00300-019-02525-0> , hdl:10013/epic.5834be42-3012-4825-9a63-77fb839e4796 EPIC3Polar Biology, SPRINGER, 42, pp. 1369-1376, ISSN: 0722-4060 Article peerRev 2019 ftawi https://doi.org/10.1007/s00300-019-02525-0 2021-12-24T15:45:41Z Fragilariopsis kerguelensis (O’ Meara) Hust. is a ubiquitous diatom of the Southern Ocean. Its thick frustules are the numerically dominant component of the siliceous sediment layer covering large parts of the seafloor beneath. Morphometric variability of frustules of this diatom has been of interest for paleoenvironmental reconstructions. Recently, two morphotypes differentiated by the morphometric descriptor rectangularity were described from a Southern Ocean sediment core, the relative abundance of which correlated with reconstructed paleotemperatures. In the present study, we use semi-automated microscopic and image analysis methods to answer whether these morphotypes also appear in recent assemblages, and if yes, do their distributions reflect geographic location or environmental factors. Three transects from the water column, sampled along the Greenwich meridian with hand nets, and one sediment surface transect from the South Pacific, were analyzed. In each of these transects, both morphotypes were detected, and annual mean sea surface temperatures (SST) were found to be a good predictor of their relative abundances. The transition between dominance of one or the other morphotype appeared roughly between the Antarctic Polar Front and the Southern Boundary of the Antarctic Circumpolar Current. Although more extensive circumpolar sampling will be needed to confirm the generality of our conclusions, the observed morphometric cline is a novel aspect of the biology of this species and can in the future potentially be used for further developing paleoproxies especially for highly F. kerguelensis-dominated sediment in the Southern Ocean. Article in Journal/Newspaper Antarc* Antarctic Polar Biology Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Greenwich Pacific Southern Ocean The Antarctic Polar Biology 42 7 1369 1376 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
Fragilariopsis kerguelensis (O’ Meara) Hust. is a ubiquitous diatom of the Southern Ocean. Its thick frustules are the numerically dominant component of the siliceous sediment layer covering large parts of the seafloor beneath. Morphometric variability of frustules of this diatom has been of interest for paleoenvironmental reconstructions. Recently, two morphotypes differentiated by the morphometric descriptor rectangularity were described from a Southern Ocean sediment core, the relative abundance of which correlated with reconstructed paleotemperatures. In the present study, we use semi-automated microscopic and image analysis methods to answer whether these morphotypes also appear in recent assemblages, and if yes, do their distributions reflect geographic location or environmental factors. Three transects from the water column, sampled along the Greenwich meridian with hand nets, and one sediment surface transect from the South Pacific, were analyzed. In each of these transects, both morphotypes were detected, and annual mean sea surface temperatures (SST) were found to be a good predictor of their relative abundances. The transition between dominance of one or the other morphotype appeared roughly between the Antarctic Polar Front and the Southern Boundary of the Antarctic Circumpolar Current. Although more extensive circumpolar sampling will be needed to confirm the generality of our conclusions, the observed morphometric cline is a novel aspect of the biology of this species and can in the future potentially be used for further developing paleoproxies especially for highly F. kerguelensis-dominated sediment in the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Glemser, Barbara Kloster, Michael Esper, Oliver Eggers, S. L. Kauer, Gerhard Beszteri, Bank |
spellingShingle |
Glemser, Barbara Kloster, Michael Esper, Oliver Eggers, S. L. Kauer, Gerhard Beszteri, Bank Biogeographic differentiation between two morphotypes of the Southern Ocean diatom Fragilariopsis kerguelensis |
author_facet |
Glemser, Barbara Kloster, Michael Esper, Oliver Eggers, S. L. Kauer, Gerhard Beszteri, Bank |
author_sort |
Glemser, Barbara |
title |
Biogeographic differentiation between two morphotypes of the Southern Ocean diatom Fragilariopsis kerguelensis |
title_short |
Biogeographic differentiation between two morphotypes of the Southern Ocean diatom Fragilariopsis kerguelensis |
title_full |
Biogeographic differentiation between two morphotypes of the Southern Ocean diatom Fragilariopsis kerguelensis |
title_fullStr |
Biogeographic differentiation between two morphotypes of the Southern Ocean diatom Fragilariopsis kerguelensis |
title_full_unstemmed |
Biogeographic differentiation between two morphotypes of the Southern Ocean diatom Fragilariopsis kerguelensis |
title_sort |
biogeographic differentiation between two morphotypes of the southern ocean diatom fragilariopsis kerguelensis |
publisher |
SPRINGER |
publishDate |
2019 |
url |
https://epic.awi.de/id/eprint/52334/ https://hdl.handle.net/10013/epic.5834be42-3012-4825-9a63-77fb839e4796 |
geographic |
Antarctic Greenwich Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Greenwich Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Polar Biology Southern Ocean |
genre_facet |
Antarc* Antarctic Polar Biology Southern Ocean |
op_source |
EPIC3Polar Biology, SPRINGER, 42, pp. 1369-1376, ISSN: 0722-4060 |
op_relation |
Glemser, B. , Kloster, M. orcid:0000-0001-9244-4925 , Esper, O. orcid:0000-0002-4342-3471 , Eggers, S. L. , Kauer, G. and Beszteri, B. orcid:0000-0002-6852-1588 (2019) Biogeographic differentiation between two morphotypes of the Southern Ocean diatom Fragilariopsis kerguelensis , Polar Biology, 42 , pp. 1369-1376 . doi:10.1007/s00300-019-02525-0 <https://doi.org/10.1007/s00300-019-02525-0> , hdl:10013/epic.5834be42-3012-4825-9a63-77fb839e4796 |
op_doi |
https://doi.org/10.1007/s00300-019-02525-0 |
container_title |
Polar Biology |
container_volume |
42 |
container_issue |
7 |
container_start_page |
1369 |
op_container_end_page |
1376 |
_version_ |
1766222104768806912 |