Spatial distributions and seasonality of four Calanus species in the Northeast Atlantic

This paper analyses spatial and seasonal patterns for near-surface abundances of four Calanus species in the Northeast Atlantic based on monthly Continuous Plankton Recorder (CPR) Survey data collected during 2008–2016. C. finmarchicus, C. helgolandicus, C. hyperboreus and C. glacialis represent dif...

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Published in:Progress in Oceanography
Main Authors: Strand, Espen, Bagøien, Espen, Edwards, Martin, Broms, Cecilie, Klevjer, Thor A.
Format: Article in Journal/Newspaper
Language:English
Published: 2020
Subjects:
Online Access:https://hdl.handle.net/11250/2723058
https://doi.org/10.1016/j.pocean.2020.102344
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spelling ftimr:oai:imr.brage.unit.no:11250/2723058 2023-05-15T14:49:54+02:00 Spatial distributions and seasonality of four Calanus species in the Northeast Atlantic Strand, Espen Bagøien, Espen Edwards, Martin Broms, Cecilie Klevjer, Thor A. 2020 application/pdf https://hdl.handle.net/11250/2723058 https://doi.org/10.1016/j.pocean.2020.102344 eng eng Havforskningsinstituttet: 99554 Progress in Oceanography. 2020, 185 1-18. urn:issn:0079-6611 https://hdl.handle.net/11250/2723058 https://doi.org/10.1016/j.pocean.2020.102344 cristin:1858430 1-18 185 Progress in Oceanography Peer reviewed Journal article 2020 ftimr https://doi.org/10.1016/j.pocean.2020.102344 2021-09-23T20:15:25Z This paper analyses spatial and seasonal patterns for near-surface abundances of four Calanus species in the Northeast Atlantic based on monthly Continuous Plankton Recorder (CPR) Survey data collected during 2008–2016. C. finmarchicus, C. helgolandicus, C. hyperboreus and C. glacialis represent different ecosystems, and water masses with differing oceanographic properties and origins. Hence, these are considered as indicator species in climate change studies. A southern transect between Norway and the United Kingdom represented the northern North Sea, a central transect crossed the Norwegian and Iceland Seas, while a northern transect between Norway and Svalbard crossed the entrance to the Barents Sea. C. finmarchicus was prevalent everywhere, while C. helgolandicus was mainly confined to the northern North Sea though also documented downstream in the Norwegian Sea as far north as the entrance to the Barents Sea. The ratio of C. helgolandicus to C. finmarchicus abundances is expected to increase in the northern North Sea and southern Norwegian Sea given continued increases in seawater temperature. C. hyperboreus and C. glacialis were mainly associated with regions influenced by Arctic waters in the Iceland and Norwegian Seas, and south of Svalbard, respectively. Within Atlantic water masses in the central Norwegian Sea, a distinct second generation of C. finmarchicus with surprisingly high late-autumn concentrations of older stages were found. In Coastal water, two or more generations of C. finmarchicus occurred, while only one generation was evident in Arctic waters. Young C. finmarchicus of the first annual generation showed an earlier timing in Coastal than Atlantic and Arctic waters. The upper range of the temperature niche for both C. hyperboreus and C. glacialis was found to be around 7 °C. However, the peak occurrence within the study area was in 1–2 °C in Arctic water in the Iceland Sea in April for C. hyperboreus, while around 5 °C in Barents Sea Arctic water in July for C. glacialis. C. finmarchicus was present in all water masses with a peak occurrence in June at around 6 °C. C. finmarchicus generally dominated the Calanus-biomass, but C. hyperboreus in Arctic water in the Iceland and Norwegian Seas in spring, and C. helgolandicus in the northern North Sea, could match or exceed the biomass of C. finmarchicus. publishedVersion Article in Journal/Newspaper Arctic Barents Sea Climate change Iceland Northeast Atlantic Norwegian Sea Svalbard Institute for Marine Research: Brage IMR Arctic Barents Sea Norway Norwegian Sea Svalbard Progress in Oceanography 185 102344
institution Open Polar
collection Institute for Marine Research: Brage IMR
op_collection_id ftimr
language English
description This paper analyses spatial and seasonal patterns for near-surface abundances of four Calanus species in the Northeast Atlantic based on monthly Continuous Plankton Recorder (CPR) Survey data collected during 2008–2016. C. finmarchicus, C. helgolandicus, C. hyperboreus and C. glacialis represent different ecosystems, and water masses with differing oceanographic properties and origins. Hence, these are considered as indicator species in climate change studies. A southern transect between Norway and the United Kingdom represented the northern North Sea, a central transect crossed the Norwegian and Iceland Seas, while a northern transect between Norway and Svalbard crossed the entrance to the Barents Sea. C. finmarchicus was prevalent everywhere, while C. helgolandicus was mainly confined to the northern North Sea though also documented downstream in the Norwegian Sea as far north as the entrance to the Barents Sea. The ratio of C. helgolandicus to C. finmarchicus abundances is expected to increase in the northern North Sea and southern Norwegian Sea given continued increases in seawater temperature. C. hyperboreus and C. glacialis were mainly associated with regions influenced by Arctic waters in the Iceland and Norwegian Seas, and south of Svalbard, respectively. Within Atlantic water masses in the central Norwegian Sea, a distinct second generation of C. finmarchicus with surprisingly high late-autumn concentrations of older stages were found. In Coastal water, two or more generations of C. finmarchicus occurred, while only one generation was evident in Arctic waters. Young C. finmarchicus of the first annual generation showed an earlier timing in Coastal than Atlantic and Arctic waters. The upper range of the temperature niche for both C. hyperboreus and C. glacialis was found to be around 7 °C. However, the peak occurrence within the study area was in 1–2 °C in Arctic water in the Iceland Sea in April for C. hyperboreus, while around 5 °C in Barents Sea Arctic water in July for C. glacialis. C. finmarchicus was present in all water masses with a peak occurrence in June at around 6 °C. C. finmarchicus generally dominated the Calanus-biomass, but C. hyperboreus in Arctic water in the Iceland and Norwegian Seas in spring, and C. helgolandicus in the northern North Sea, could match or exceed the biomass of C. finmarchicus. publishedVersion
format Article in Journal/Newspaper
author Strand, Espen
Bagøien, Espen
Edwards, Martin
Broms, Cecilie
Klevjer, Thor A.
spellingShingle Strand, Espen
Bagøien, Espen
Edwards, Martin
Broms, Cecilie
Klevjer, Thor A.
Spatial distributions and seasonality of four Calanus species in the Northeast Atlantic
author_facet Strand, Espen
Bagøien, Espen
Edwards, Martin
Broms, Cecilie
Klevjer, Thor A.
author_sort Strand, Espen
title Spatial distributions and seasonality of four Calanus species in the Northeast Atlantic
title_short Spatial distributions and seasonality of four Calanus species in the Northeast Atlantic
title_full Spatial distributions and seasonality of four Calanus species in the Northeast Atlantic
title_fullStr Spatial distributions and seasonality of four Calanus species in the Northeast Atlantic
title_full_unstemmed Spatial distributions and seasonality of four Calanus species in the Northeast Atlantic
title_sort spatial distributions and seasonality of four calanus species in the northeast atlantic
publishDate 2020
url https://hdl.handle.net/11250/2723058
https://doi.org/10.1016/j.pocean.2020.102344
geographic Arctic
Barents Sea
Norway
Norwegian Sea
Svalbard
geographic_facet Arctic
Barents Sea
Norway
Norwegian Sea
Svalbard
genre Arctic
Barents Sea
Climate change
Iceland
Northeast Atlantic
Norwegian Sea
Svalbard
genre_facet Arctic
Barents Sea
Climate change
Iceland
Northeast Atlantic
Norwegian Sea
Svalbard
op_source 1-18
185
Progress in Oceanography
op_relation Havforskningsinstituttet: 99554
Progress in Oceanography. 2020, 185 1-18.
urn:issn:0079-6611
https://hdl.handle.net/11250/2723058
https://doi.org/10.1016/j.pocean.2020.102344
cristin:1858430
op_doi https://doi.org/10.1016/j.pocean.2020.102344
container_title Progress in Oceanography
container_volume 185
container_start_page 102344
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