Life on the ice-edge: Paleoenvironmental significance of the radiolarian species Amphimelissa setosa in the northern hemisphere
The high-latitude Northern Hemisphere is a key region in the global climate balance. Variations in sea-ice extent affect biological productivity, CO2 exchange and carbon drawdown. Marine proxies indicative of proximity of the ice-marginal zone are therefore essential to understand these processes. A...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/441351 2023-05-15T14:29:22+02:00 Life on the ice-edge: Paleoenvironmental significance of the radiolarian species Amphimelissa setosa in the northern hemisphere Hernández-Almeida, Iván Björklund, Kjell R. Diz, Paula Kruglikova, Svetlana Ikenoue, Takahito Matul, Alexander Saavedra-Pellitero, Mariem Swanberg, Neil 2020-11-15 application/application/pdf https://hdl.handle.net/20.500.11850/441351 https://doi.org/10.3929/ethz-b-000441351 en eng Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2020.106565 info:eu-repo/semantics/altIdentifier/wos/000582803000006 http://hdl.handle.net/20.500.11850/441351 doi:10.3929/ethz-b-000441351 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International CC-BY-NC-ND Quaternary Science Reviews, 248 Radiolaria Amphimelissa setosa Ice-edge Northern Hemisphere Paleoecology Proxy info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftethz https://doi.org/20.500.11850/441351 https://doi.org/10.3929/ethz-b-000441351 https://doi.org/10.1016/j.quascirev.2020.106565 2022-04-25T14:13:43Z The high-latitude Northern Hemisphere is a key region in the global climate balance. Variations in sea-ice extent affect biological productivity, CO2 exchange and carbon drawdown. Marine proxies indicative of proximity of the ice-marginal zone are therefore essential to understand these processes. Amphimelissa setosa is nowadays a dominant radiolarian species in the Arctic basin and very abundant in the high-latitude North Atlantic. This species, now absent from the North Pacific, has been widely used as a qualitative proxy of modern and past environmental conditions in the high-latitude Northern Hemisphere. Using our new and published data on the distribution of A. setosa in plankton, sediment trap, surface sediment and downcore samples, we provide a quantitative ecological context for the occurrence of this species. We find that the optimal depth and season of A. setosa in the modern North Atlantic and the Chukchi Sea are 160 m and the late boreal summer/early fall (August–October), respectively. A regression model combining environmental variables (temperature, salinity, silicate and chlorophyll-a concentrations, apparent oxygen utilization, sea-ice) at that season and depth, are able to explain 43% of the distribution of this species in surface sediments. Based on these new findings, we conclude that the presence of A. setosa in surface sediments is closely related to high primary production in the proximity of the sea-ice and areas of ice rafting. The onset of this species started at ca. 1.5 Ma in the North Pacific, linked to a gradual cooling, increased silica availability and southward advance of the ice-margins since the Early Pleistocene. Amphimelissa setosa’s decline in this region was likely caused by the development of a quasi-permanent halocline, perennial sea-ice and depletion of silica during marine isotope stage 4. In the high-latitude North Atlantic, the relative abundance of A. setosa appears to be related to cooling and supply of dissolved silica from the continent during ice-rafting events. The comprehensive approach taken in this study suggest that A. setosa is a useful proxy to explore past variations in the ice-cover in the high-latitude Northern Hemisphere. ISSN:0277-3791 Article in Journal/Newspaper Arctic Basin Arctic Chukchi Chukchi Sea North Atlantic Sea ice ETH Zürich Research Collection Arctic Chukchi Sea Pacific |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
Radiolaria Amphimelissa setosa Ice-edge Northern Hemisphere Paleoecology Proxy |
spellingShingle |
Radiolaria Amphimelissa setosa Ice-edge Northern Hemisphere Paleoecology Proxy Hernández-Almeida, Iván Björklund, Kjell R. Diz, Paula Kruglikova, Svetlana Ikenoue, Takahito Matul, Alexander Saavedra-Pellitero, Mariem Swanberg, Neil Life on the ice-edge: Paleoenvironmental significance of the radiolarian species Amphimelissa setosa in the northern hemisphere |
topic_facet |
Radiolaria Amphimelissa setosa Ice-edge Northern Hemisphere Paleoecology Proxy |
description |
The high-latitude Northern Hemisphere is a key region in the global climate balance. Variations in sea-ice extent affect biological productivity, CO2 exchange and carbon drawdown. Marine proxies indicative of proximity of the ice-marginal zone are therefore essential to understand these processes. Amphimelissa setosa is nowadays a dominant radiolarian species in the Arctic basin and very abundant in the high-latitude North Atlantic. This species, now absent from the North Pacific, has been widely used as a qualitative proxy of modern and past environmental conditions in the high-latitude Northern Hemisphere. Using our new and published data on the distribution of A. setosa in plankton, sediment trap, surface sediment and downcore samples, we provide a quantitative ecological context for the occurrence of this species. We find that the optimal depth and season of A. setosa in the modern North Atlantic and the Chukchi Sea are 160 m and the late boreal summer/early fall (August–October), respectively. A regression model combining environmental variables (temperature, salinity, silicate and chlorophyll-a concentrations, apparent oxygen utilization, sea-ice) at that season and depth, are able to explain 43% of the distribution of this species in surface sediments. Based on these new findings, we conclude that the presence of A. setosa in surface sediments is closely related to high primary production in the proximity of the sea-ice and areas of ice rafting. The onset of this species started at ca. 1.5 Ma in the North Pacific, linked to a gradual cooling, increased silica availability and southward advance of the ice-margins since the Early Pleistocene. Amphimelissa setosa’s decline in this region was likely caused by the development of a quasi-permanent halocline, perennial sea-ice and depletion of silica during marine isotope stage 4. In the high-latitude North Atlantic, the relative abundance of A. setosa appears to be related to cooling and supply of dissolved silica from the continent during ice-rafting events. The comprehensive approach taken in this study suggest that A. setosa is a useful proxy to explore past variations in the ice-cover in the high-latitude Northern Hemisphere. ISSN:0277-3791 |
format |
Article in Journal/Newspaper |
author |
Hernández-Almeida, Iván Björklund, Kjell R. Diz, Paula Kruglikova, Svetlana Ikenoue, Takahito Matul, Alexander Saavedra-Pellitero, Mariem Swanberg, Neil |
author_facet |
Hernández-Almeida, Iván Björklund, Kjell R. Diz, Paula Kruglikova, Svetlana Ikenoue, Takahito Matul, Alexander Saavedra-Pellitero, Mariem Swanberg, Neil |
author_sort |
Hernández-Almeida, Iván |
title |
Life on the ice-edge: Paleoenvironmental significance of the radiolarian species Amphimelissa setosa in the northern hemisphere |
title_short |
Life on the ice-edge: Paleoenvironmental significance of the radiolarian species Amphimelissa setosa in the northern hemisphere |
title_full |
Life on the ice-edge: Paleoenvironmental significance of the radiolarian species Amphimelissa setosa in the northern hemisphere |
title_fullStr |
Life on the ice-edge: Paleoenvironmental significance of the radiolarian species Amphimelissa setosa in the northern hemisphere |
title_full_unstemmed |
Life on the ice-edge: Paleoenvironmental significance of the radiolarian species Amphimelissa setosa in the northern hemisphere |
title_sort |
life on the ice-edge: paleoenvironmental significance of the radiolarian species amphimelissa setosa in the northern hemisphere |
publisher |
Elsevier |
publishDate |
2020 |
url |
https://hdl.handle.net/20.500.11850/441351 https://doi.org/10.3929/ethz-b-000441351 |
geographic |
Arctic Chukchi Sea Pacific |
geographic_facet |
Arctic Chukchi Sea Pacific |
genre |
Arctic Basin Arctic Chukchi Chukchi Sea North Atlantic Sea ice |
genre_facet |
Arctic Basin Arctic Chukchi Chukchi Sea North Atlantic Sea ice |
op_source |
Quaternary Science Reviews, 248 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2020.106565 info:eu-repo/semantics/altIdentifier/wos/000582803000006 http://hdl.handle.net/20.500.11850/441351 doi:10.3929/ethz-b-000441351 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/20.500.11850/441351 https://doi.org/10.3929/ethz-b-000441351 https://doi.org/10.1016/j.quascirev.2020.106565 |
_version_ |
1766303399241842688 |