Blue whiting Micromesistius poutassou diel feeding behaviour in the Irminger Sea
With warming ocean temperatures, the abundance of blue whiting Micromesistius poutassou is increasing in the waters around Greenland. However, in this region, knowledge about the species’ trophic role in the ecosystem is scarce. Consequently, we investigated the diet composition and diel feeding beh...
Published in: | Marine Ecology Progress Series |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2021
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Online Access: | https://orbit.dtu.dk/en/publications/52298a9d-e9bc-49c6-b60f-678ddb33ba88 https://doi.org/10.3354/meps13918 https://backend.orbit.dtu.dk/ws/files/263326782/m678p001.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/52298a9d-e9bc-49c6-b60f-678ddb33ba88 2023-07-30T04:02:46+02:00 Blue whiting Micromesistius poutassou diel feeding behaviour in the Irminger Sea Post, Søren Jónasdóttir, Sigrún H. Andreasen, Heidi Ólafsdóttir, Anna Heida Jansen, Teunis 2021 application/pdf https://orbit.dtu.dk/en/publications/52298a9d-e9bc-49c6-b60f-678ddb33ba88 https://doi.org/10.3354/meps13918 https://backend.orbit.dtu.dk/ws/files/263326782/m678p001.pdf eng eng info:eu-repo/semantics/openAccess Post , S , Jónasdóttir , S H , Andreasen , H , Ólafsdóttir , A H & Jansen , T 2021 , ' Blue whiting Micromesistius poutassou diel feeding behaviour in the Irminger Sea ' , Marine Ecology Progress Series , vol. 678 , pp. 1-16 . https://doi.org/10.3354/meps13918 Calanus copepods Diel migration Food selectivity Greenland waters Mesopelagic fish Stomach content analysis article 2021 ftdtupubl https://doi.org/10.3354/meps13918 2023-07-12T22:59:10Z With warming ocean temperatures, the abundance of blue whiting Micromesistius poutassou is increasing in the waters around Greenland. However, in this region, knowledge about the species’ trophic role in the ecosystem is scarce. Consequently, we investigated the diet composition and diel feeding behaviour of blue whiting in the north-eastern part of the Irminger Sea in Greenland waters by analysing their stomach contents and the vertical position/movements of their prey from zooplankton samples and hydroacoustic measurements. We collected the data during a designated experimental survey in July 2016 with repeated sampling at the same location. Results from the stomachs of 624 blue whiting individuals ranging from 22-39 cm long (total length) showed that the highest food intake took place from noon until late evening, with minimum feeding occurring in the morning. The most essential prey groups consisted of euphausiids, copepods, amphipods and fish, in that respective order. Regarding copepod prey, blue whiting had a strong affinity for Calanus hyperboreus and Paraeuchaeta spp. and showed potential for local depletion of these large copepods. On the other hand, the more abundant but smaller C. finmarchicus was almost absent in the fish stomachs, in contrast to findings in other regions. This new understanding provides an early indication of some of the emerging trophodynamics in the Irminger Sea and similar subarctic zooplankton communities with increasing numbers of blue whiting. Our results confirm the importance of accounting for diel and size-specific differences in blue whiting feeding when studying various aspects of its food intake. Article in Journal/Newspaper Calanus hyperboreus Greenland Subarctic Copepods Technical University of Denmark: DTU Orbit Greenland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Marine Ecology Progress Series 678 1 16 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Calanus copepods Diel migration Food selectivity Greenland waters Mesopelagic fish Stomach content analysis |
spellingShingle |
Calanus copepods Diel migration Food selectivity Greenland waters Mesopelagic fish Stomach content analysis Post, Søren Jónasdóttir, Sigrún H. Andreasen, Heidi Ólafsdóttir, Anna Heida Jansen, Teunis Blue whiting Micromesistius poutassou diel feeding behaviour in the Irminger Sea |
topic_facet |
Calanus copepods Diel migration Food selectivity Greenland waters Mesopelagic fish Stomach content analysis |
description |
With warming ocean temperatures, the abundance of blue whiting Micromesistius poutassou is increasing in the waters around Greenland. However, in this region, knowledge about the species’ trophic role in the ecosystem is scarce. Consequently, we investigated the diet composition and diel feeding behaviour of blue whiting in the north-eastern part of the Irminger Sea in Greenland waters by analysing their stomach contents and the vertical position/movements of their prey from zooplankton samples and hydroacoustic measurements. We collected the data during a designated experimental survey in July 2016 with repeated sampling at the same location. Results from the stomachs of 624 blue whiting individuals ranging from 22-39 cm long (total length) showed that the highest food intake took place from noon until late evening, with minimum feeding occurring in the morning. The most essential prey groups consisted of euphausiids, copepods, amphipods and fish, in that respective order. Regarding copepod prey, blue whiting had a strong affinity for Calanus hyperboreus and Paraeuchaeta spp. and showed potential for local depletion of these large copepods. On the other hand, the more abundant but smaller C. finmarchicus was almost absent in the fish stomachs, in contrast to findings in other regions. This new understanding provides an early indication of some of the emerging trophodynamics in the Irminger Sea and similar subarctic zooplankton communities with increasing numbers of blue whiting. Our results confirm the importance of accounting for diel and size-specific differences in blue whiting feeding when studying various aspects of its food intake. |
format |
Article in Journal/Newspaper |
author |
Post, Søren Jónasdóttir, Sigrún H. Andreasen, Heidi Ólafsdóttir, Anna Heida Jansen, Teunis |
author_facet |
Post, Søren Jónasdóttir, Sigrún H. Andreasen, Heidi Ólafsdóttir, Anna Heida Jansen, Teunis |
author_sort |
Post, Søren |
title |
Blue whiting Micromesistius poutassou diel feeding behaviour in the Irminger Sea |
title_short |
Blue whiting Micromesistius poutassou diel feeding behaviour in the Irminger Sea |
title_full |
Blue whiting Micromesistius poutassou diel feeding behaviour in the Irminger Sea |
title_fullStr |
Blue whiting Micromesistius poutassou diel feeding behaviour in the Irminger Sea |
title_full_unstemmed |
Blue whiting Micromesistius poutassou diel feeding behaviour in the Irminger Sea |
title_sort |
blue whiting micromesistius poutassou diel feeding behaviour in the irminger sea |
publishDate |
2021 |
url |
https://orbit.dtu.dk/en/publications/52298a9d-e9bc-49c6-b60f-678ddb33ba88 https://doi.org/10.3354/meps13918 https://backend.orbit.dtu.dk/ws/files/263326782/m678p001.pdf |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Greenland Irminger Sea |
geographic_facet |
Greenland Irminger Sea |
genre |
Calanus hyperboreus Greenland Subarctic Copepods |
genre_facet |
Calanus hyperboreus Greenland Subarctic Copepods |
op_source |
Post , S , Jónasdóttir , S H , Andreasen , H , Ólafsdóttir , A H & Jansen , T 2021 , ' Blue whiting Micromesistius poutassou diel feeding behaviour in the Irminger Sea ' , Marine Ecology Progress Series , vol. 678 , pp. 1-16 . https://doi.org/10.3354/meps13918 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3354/meps13918 |
container_title |
Marine Ecology Progress Series |
container_volume |
678 |
container_start_page |
1 |
op_container_end_page |
16 |
_version_ |
1772813591619043328 |