Sedimentary Ancient DNA From the Subarctic North Pacific: How Sea Ice, Salinity, and Insolation Dynamics Have Shaped Diatom Composition and Richness Over the Past 20,000 Years
Key Points: • diatom sedaDNA composition is concordant with reconstructed sea-ice dynamics, SSTs and subsurface salinities over the past millenia • loss of diatom richness at ~11.1 cal kyr BP is possibly a consequence of increased freshwater input from Kamchatka • shifts of potential ecotypes of spe...
Published in: | Paleoceanography and Paleoclimatology |
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Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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AGU (American Geophysical Union)
2021
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Online Access: | https://oceanrep.geomar.de/id/eprint/52271/ https://oceanrep.geomar.de/id/eprint/52271/2/2020pa004091-sup-0001-supporting https://oceanrep.geomar.de/id/eprint/52271/3/2020pa004091-sup-0002-table https://oceanrep.geomar.de/id/eprint/52271/4/2020pa004091-sup-0003-table https://oceanrep.geomar.de/id/eprint/52271/10/2020PA004091%281%29.pdf https://doi.org/10.1029/2020PA004091 |
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ftoceanrep:oai:oceanrep.geomar.de:52271 2024-02-11T10:05:24+01:00 Sedimentary Ancient DNA From the Subarctic North Pacific: How Sea Ice, Salinity, and Insolation Dynamics Have Shaped Diatom Composition and Richness Over the Past 20,000 Years Zimmermann, H. H. Stoof‐Leichsenring, K. R. Kruse, S. Nürnberg, Dirk Tiedemann, Ralf Herzschuh, U. 2021-04 other text https://oceanrep.geomar.de/id/eprint/52271/ https://oceanrep.geomar.de/id/eprint/52271/2/2020pa004091-sup-0001-supporting https://oceanrep.geomar.de/id/eprint/52271/3/2020pa004091-sup-0002-table https://oceanrep.geomar.de/id/eprint/52271/4/2020pa004091-sup-0003-table https://oceanrep.geomar.de/id/eprint/52271/10/2020PA004091%281%29.pdf https://doi.org/10.1029/2020PA004091 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/52271/2/2020pa004091-sup-0001-supporting https://oceanrep.geomar.de/id/eprint/52271/3/2020pa004091-sup-0002-table https://oceanrep.geomar.de/id/eprint/52271/4/2020pa004091-sup-0003-table https://oceanrep.geomar.de/id/eprint/52271/10/2020PA004091%281%29.pdf Zimmermann, H. H., Stoof‐Leichsenring, K. R., Kruse, S., Nürnberg, D. , Tiedemann, R. and Herzschuh, U. (2021) Sedimentary Ancient DNA From the Subarctic North Pacific: How Sea Ice, Salinity, and Insolation Dynamics Have Shaped Diatom Composition and Richness Over the Past 20,000 Years. Open Access Paleoceanography and Paleoclimatology, 36 (4). e2020PA004091. DOI 10.1029/2020PA004091 <https://doi.org/10.1029/2020PA004091>. doi:10.1029/2020PA004091 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2021 ftoceanrep https://doi.org/10.1029/2020PA004091 2024-01-15T00:23:13Z Key Points: • diatom sedaDNA composition is concordant with reconstructed sea-ice dynamics, SSTs and subsurface salinities over the past millenia • loss of diatom richness at ~11.1 cal kyr BP is possibly a consequence of increased freshwater input from Kamchatka • shifts of potential ecotypes of species from the genus Chaetoceros with changing environmental conditions We traced diatom composition and diversity through time using diatom derived sedimentary ancient DNA (sedaDNA) from eastern continental slope sediments off Kamchatka (North Pacific) by applying a short, diatom‐specific marker on 63 samples in a DNA metabarcoding approach. The sequences were assigned to diatoms that are common in the area and characteristic of cold water. SedaDNA allowed us to observe shifts of potential lineages from species of the genus Chaetoceros that can be related to different climatic phases, suggesting that pre‐adapted ecotypes might have played a role in the long‐term success of species in areas of changing environmental conditions. These sedaDNA results complement our understanding of the long‐term history of diatom assemblages and their general relationship to environmental conditions of the past. Sea‐ice diatoms (Pauliella taeniata (Grunow) Round & Basson, Attheya septentrionalis (Østrup) R.M.Crawford and Nitzschia frigida (Grunow)) detected during the late glacial and Younger Dryas are in agreement with previous sea‐ice reconstructions. A positive correlation between pennate diatom richness and the sea‐ice proxy IP25 suggests that sea ice fosters pennate diatom richness, whereas a negative correlation with June insolation and temperature points to unfavorable conditions during the Holocene. A sharp increase in proportions of freshwater diatoms at ∼11.1 cal kyr BP implies the influence of terrestrial runoff and coincides with the loss of 42% of diatom sequence variants. We assume that reduced salinity at this time stabilized vertical stratification which limited the replenishment of nutrients in the euphotic zone. Article in Journal/Newspaper Kamchatka Sea ice Subarctic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Pacific Paleoceanography and Paleoclimatology 36 4 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Key Points: • diatom sedaDNA composition is concordant with reconstructed sea-ice dynamics, SSTs and subsurface salinities over the past millenia • loss of diatom richness at ~11.1 cal kyr BP is possibly a consequence of increased freshwater input from Kamchatka • shifts of potential ecotypes of species from the genus Chaetoceros with changing environmental conditions We traced diatom composition and diversity through time using diatom derived sedimentary ancient DNA (sedaDNA) from eastern continental slope sediments off Kamchatka (North Pacific) by applying a short, diatom‐specific marker on 63 samples in a DNA metabarcoding approach. The sequences were assigned to diatoms that are common in the area and characteristic of cold water. SedaDNA allowed us to observe shifts of potential lineages from species of the genus Chaetoceros that can be related to different climatic phases, suggesting that pre‐adapted ecotypes might have played a role in the long‐term success of species in areas of changing environmental conditions. These sedaDNA results complement our understanding of the long‐term history of diatom assemblages and their general relationship to environmental conditions of the past. Sea‐ice diatoms (Pauliella taeniata (Grunow) Round & Basson, Attheya septentrionalis (Østrup) R.M.Crawford and Nitzschia frigida (Grunow)) detected during the late glacial and Younger Dryas are in agreement with previous sea‐ice reconstructions. A positive correlation between pennate diatom richness and the sea‐ice proxy IP25 suggests that sea ice fosters pennate diatom richness, whereas a negative correlation with June insolation and temperature points to unfavorable conditions during the Holocene. A sharp increase in proportions of freshwater diatoms at ∼11.1 cal kyr BP implies the influence of terrestrial runoff and coincides with the loss of 42% of diatom sequence variants. We assume that reduced salinity at this time stabilized vertical stratification which limited the replenishment of nutrients in the euphotic zone. |
format |
Article in Journal/Newspaper |
author |
Zimmermann, H. H. Stoof‐Leichsenring, K. R. Kruse, S. Nürnberg, Dirk Tiedemann, Ralf Herzschuh, U. |
spellingShingle |
Zimmermann, H. H. Stoof‐Leichsenring, K. R. Kruse, S. Nürnberg, Dirk Tiedemann, Ralf Herzschuh, U. Sedimentary Ancient DNA From the Subarctic North Pacific: How Sea Ice, Salinity, and Insolation Dynamics Have Shaped Diatom Composition and Richness Over the Past 20,000 Years |
author_facet |
Zimmermann, H. H. Stoof‐Leichsenring, K. R. Kruse, S. Nürnberg, Dirk Tiedemann, Ralf Herzschuh, U. |
author_sort |
Zimmermann, H. H. |
title |
Sedimentary Ancient DNA From the Subarctic North Pacific: How Sea Ice, Salinity, and Insolation Dynamics Have Shaped Diatom Composition and Richness Over the Past 20,000 Years |
title_short |
Sedimentary Ancient DNA From the Subarctic North Pacific: How Sea Ice, Salinity, and Insolation Dynamics Have Shaped Diatom Composition and Richness Over the Past 20,000 Years |
title_full |
Sedimentary Ancient DNA From the Subarctic North Pacific: How Sea Ice, Salinity, and Insolation Dynamics Have Shaped Diatom Composition and Richness Over the Past 20,000 Years |
title_fullStr |
Sedimentary Ancient DNA From the Subarctic North Pacific: How Sea Ice, Salinity, and Insolation Dynamics Have Shaped Diatom Composition and Richness Over the Past 20,000 Years |
title_full_unstemmed |
Sedimentary Ancient DNA From the Subarctic North Pacific: How Sea Ice, Salinity, and Insolation Dynamics Have Shaped Diatom Composition and Richness Over the Past 20,000 Years |
title_sort |
sedimentary ancient dna from the subarctic north pacific: how sea ice, salinity, and insolation dynamics have shaped diatom composition and richness over the past 20,000 years |
publisher |
AGU (American Geophysical Union) |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/52271/ https://oceanrep.geomar.de/id/eprint/52271/2/2020pa004091-sup-0001-supporting https://oceanrep.geomar.de/id/eprint/52271/3/2020pa004091-sup-0002-table https://oceanrep.geomar.de/id/eprint/52271/4/2020pa004091-sup-0003-table https://oceanrep.geomar.de/id/eprint/52271/10/2020PA004091%281%29.pdf https://doi.org/10.1029/2020PA004091 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Kamchatka Sea ice Subarctic |
genre_facet |
Kamchatka Sea ice Subarctic |
op_relation |
https://oceanrep.geomar.de/id/eprint/52271/2/2020pa004091-sup-0001-supporting https://oceanrep.geomar.de/id/eprint/52271/3/2020pa004091-sup-0002-table https://oceanrep.geomar.de/id/eprint/52271/4/2020pa004091-sup-0003-table https://oceanrep.geomar.de/id/eprint/52271/10/2020PA004091%281%29.pdf Zimmermann, H. H., Stoof‐Leichsenring, K. R., Kruse, S., Nürnberg, D. , Tiedemann, R. and Herzschuh, U. (2021) Sedimentary Ancient DNA From the Subarctic North Pacific: How Sea Ice, Salinity, and Insolation Dynamics Have Shaped Diatom Composition and Richness Over the Past 20,000 Years. Open Access Paleoceanography and Paleoclimatology, 36 (4). e2020PA004091. DOI 10.1029/2020PA004091 <https://doi.org/10.1029/2020PA004091>. doi:10.1029/2020PA004091 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2020PA004091 |
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Paleoceanography and Paleoclimatology |
container_volume |
36 |
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4 |
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1790602430267785216 |