Solenosmilia variabilis-bearing cold-water coral mounds off Brazil
Cold-water corals (CWC), dominantly Desmophyllum pertusum (previously Lophelia pertusa), and their mounds have been in the focus of marine research during the last two decades; however, little is known about the mound-forming capacity of other CWC species. Here, we present new 230Th/U age constraint...
Published in: | Coral Reefs |
---|---|
Main Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Springer
2020
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/48606/ https://oceanrep.geomar.de/id/eprint/48606/5/Raddatz2020_Article_SolenosmiliaVariabilis-bearing.pdf https://oceanrep.geomar.de/id/eprint/48606/2/338_2019_1882_MOESM1_ESM.docx https://oceanrep.geomar.de/id/eprint/48606/11/rue_svb.pdf https://doi.org/10.1007/s00338-019-01882-w |
id |
ftoceanrep:oai:oceanrep.geomar.de:48606 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:48606 2023-05-15T14:07:51+02:00 Solenosmilia variabilis-bearing cold-water coral mounds off Brazil Raddatz, Jacek Titschack, J. Frank, N. Freiwald, A. Conforti, A. Osborne, Anne Skornitzke, S. Stiller, W. Rüggeberg, Andres Voigt, S. Albuquerque, A. L. S. Vertino, A. Schröder-Ritzrau, A. Bahr, A. 2020-02 text https://oceanrep.geomar.de/id/eprint/48606/ https://oceanrep.geomar.de/id/eprint/48606/5/Raddatz2020_Article_SolenosmiliaVariabilis-bearing.pdf https://oceanrep.geomar.de/id/eprint/48606/2/338_2019_1882_MOESM1_ESM.docx https://oceanrep.geomar.de/id/eprint/48606/11/rue_svb.pdf https://doi.org/10.1007/s00338-019-01882-w en eng Springer https://oceanrep.geomar.de/id/eprint/48606/5/Raddatz2020_Article_SolenosmiliaVariabilis-bearing.pdf https://oceanrep.geomar.de/id/eprint/48606/2/338_2019_1882_MOESM1_ESM.docx https://oceanrep.geomar.de/id/eprint/48606/11/rue_svb.pdf Raddatz, J., Titschack, J., Frank, N., Freiwald, A., Conforti, A., Osborne, A. , Skornitzke, S., Stiller, W., Rüggeberg, A., Voigt, S., Albuquerque, A. L. S., Vertino, A., Schröder-Ritzrau, A. and Bahr, A. (2020) Solenosmilia variabilis-bearing cold-water coral mounds off Brazil. Open Access Coral Reefs, 39 (1). pp. 69-83. DOI 10.1007/s00338-019-01882-w <https://doi.org/10.1007/s00338-019-01882-w>. doi:10.1007/s00338-019-01882-w cc_by_nc_nd_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2020 ftoceanrep https://doi.org/10.1007/s00338-019-01882-w 2023-04-07T15:48:48Z Cold-water corals (CWC), dominantly Desmophyllum pertusum (previously Lophelia pertusa), and their mounds have been in the focus of marine research during the last two decades; however, little is known about the mound-forming capacity of other CWC species. Here, we present new 230Th/U age constraints of the relatively rarely studied framework-building CWC Solenosmilia variabilis from a mound structure off the Brazilian margin combined with computed tomography (CT) acquisition. Our results show that S. variabilis can also contribute to mound formation, but reveal coral-free intervals of hemipelagic sediment deposits, which is in contrast to most of the previously studied CWC mound structures. We demonstrate that S. variabilis only occurs in short episodes of < 4 kyr characterized by a coral content of up to 31 vol%. In particular, it is possible to identify distinct clusters of enhanced aggradation rates (AR) between 54 and 80 cm ka−1. The determined AR are close to the maximal growth rates of individual S. variabilis specimens, but are still up to one order of magnitude smaller than the AR of D. pertusum mounds. Periods of enhanced S. variabilis AR predominantly fall into glacial periods and glacial terminations that were characterized by a 60–90 m lower sea level. The formation of nearby D. pertusum mounds is also associated with the last glacial termination. We suggest that the short-term periods of coral growth and mound formation benefited from enhanced organic matter supply, either from the adjacent exposed shelf and coast and/or from enhanced sea-surface productivity. This organic matter became concentrated on a deeper water-mass boundary between South Atlantic Central Water and the Antarctic Intermediate Water and may have been distributed by a stronger hydrodynamic regime. Finally, periods of enhanced coral mound formation can also be linked to advection of nutrient-rich intermediate water masses that in turn might have (directly or indirectly) further facilitated coral growth and mound formation. Article in Journal/Newspaper Antarc* Antarctic Lophelia pertusa OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic The Antarctic Coral Reefs 39 1 69 83 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Cold-water corals (CWC), dominantly Desmophyllum pertusum (previously Lophelia pertusa), and their mounds have been in the focus of marine research during the last two decades; however, little is known about the mound-forming capacity of other CWC species. Here, we present new 230Th/U age constraints of the relatively rarely studied framework-building CWC Solenosmilia variabilis from a mound structure off the Brazilian margin combined with computed tomography (CT) acquisition. Our results show that S. variabilis can also contribute to mound formation, but reveal coral-free intervals of hemipelagic sediment deposits, which is in contrast to most of the previously studied CWC mound structures. We demonstrate that S. variabilis only occurs in short episodes of < 4 kyr characterized by a coral content of up to 31 vol%. In particular, it is possible to identify distinct clusters of enhanced aggradation rates (AR) between 54 and 80 cm ka−1. The determined AR are close to the maximal growth rates of individual S. variabilis specimens, but are still up to one order of magnitude smaller than the AR of D. pertusum mounds. Periods of enhanced S. variabilis AR predominantly fall into glacial periods and glacial terminations that were characterized by a 60–90 m lower sea level. The formation of nearby D. pertusum mounds is also associated with the last glacial termination. We suggest that the short-term periods of coral growth and mound formation benefited from enhanced organic matter supply, either from the adjacent exposed shelf and coast and/or from enhanced sea-surface productivity. This organic matter became concentrated on a deeper water-mass boundary between South Atlantic Central Water and the Antarctic Intermediate Water and may have been distributed by a stronger hydrodynamic regime. Finally, periods of enhanced coral mound formation can also be linked to advection of nutrient-rich intermediate water masses that in turn might have (directly or indirectly) further facilitated coral growth and mound formation. |
format |
Article in Journal/Newspaper |
author |
Raddatz, Jacek Titschack, J. Frank, N. Freiwald, A. Conforti, A. Osborne, Anne Skornitzke, S. Stiller, W. Rüggeberg, Andres Voigt, S. Albuquerque, A. L. S. Vertino, A. Schröder-Ritzrau, A. Bahr, A. |
spellingShingle |
Raddatz, Jacek Titschack, J. Frank, N. Freiwald, A. Conforti, A. Osborne, Anne Skornitzke, S. Stiller, W. Rüggeberg, Andres Voigt, S. Albuquerque, A. L. S. Vertino, A. Schröder-Ritzrau, A. Bahr, A. Solenosmilia variabilis-bearing cold-water coral mounds off Brazil |
author_facet |
Raddatz, Jacek Titschack, J. Frank, N. Freiwald, A. Conforti, A. Osborne, Anne Skornitzke, S. Stiller, W. Rüggeberg, Andres Voigt, S. Albuquerque, A. L. S. Vertino, A. Schröder-Ritzrau, A. Bahr, A. |
author_sort |
Raddatz, Jacek |
title |
Solenosmilia variabilis-bearing cold-water coral mounds off Brazil |
title_short |
Solenosmilia variabilis-bearing cold-water coral mounds off Brazil |
title_full |
Solenosmilia variabilis-bearing cold-water coral mounds off Brazil |
title_fullStr |
Solenosmilia variabilis-bearing cold-water coral mounds off Brazil |
title_full_unstemmed |
Solenosmilia variabilis-bearing cold-water coral mounds off Brazil |
title_sort |
solenosmilia variabilis-bearing cold-water coral mounds off brazil |
publisher |
Springer |
publishDate |
2020 |
url |
https://oceanrep.geomar.de/id/eprint/48606/ https://oceanrep.geomar.de/id/eprint/48606/5/Raddatz2020_Article_SolenosmiliaVariabilis-bearing.pdf https://oceanrep.geomar.de/id/eprint/48606/2/338_2019_1882_MOESM1_ESM.docx https://oceanrep.geomar.de/id/eprint/48606/11/rue_svb.pdf https://doi.org/10.1007/s00338-019-01882-w |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Lophelia pertusa |
genre_facet |
Antarc* Antarctic Lophelia pertusa |
op_relation |
https://oceanrep.geomar.de/id/eprint/48606/5/Raddatz2020_Article_SolenosmiliaVariabilis-bearing.pdf https://oceanrep.geomar.de/id/eprint/48606/2/338_2019_1882_MOESM1_ESM.docx https://oceanrep.geomar.de/id/eprint/48606/11/rue_svb.pdf Raddatz, J., Titschack, J., Frank, N., Freiwald, A., Conforti, A., Osborne, A. , Skornitzke, S., Stiller, W., Rüggeberg, A., Voigt, S., Albuquerque, A. L. S., Vertino, A., Schröder-Ritzrau, A. and Bahr, A. (2020) Solenosmilia variabilis-bearing cold-water coral mounds off Brazil. Open Access Coral Reefs, 39 (1). pp. 69-83. DOI 10.1007/s00338-019-01882-w <https://doi.org/10.1007/s00338-019-01882-w>. doi:10.1007/s00338-019-01882-w |
op_rights |
cc_by_nc_nd_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s00338-019-01882-w |
container_title |
Coral Reefs |
container_volume |
39 |
container_issue |
1 |
container_start_page |
69 |
op_container_end_page |
83 |
_version_ |
1766279891862421504 |