Micronekton biomass distribution, improved estimates across four north Atlantic basins
Distribution of micronekton was investigated during early summer of 2013, using data from a cruise covering the central parts of four north Atlantic basins, the Norwegian Sea (NS), Iceland Sea (ICS), Irminger Sea (IRS), and Labrador Sea (LS). Continuous underway acoustics mapped vertical and horizon...
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Online Access: | https://hdl.handle.net/1956/23853 https://doi.org/10.1016/j.dsr2.2019.104691 |
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ftunivbergen:oai:bora.uib.no:1956/23853 2023-05-15T16:51:04+02:00 Micronekton biomass distribution, improved estimates across four north Atlantic basins Klevjer, Thor A. Melle, Webjørn Raunsgård Knutsen, Tor Strand, Espen Korneliussen, Rolf Dupont, Nicolas Salvanes, Anne Gro Vea Wiebe, Peter H. 2020-01-28T08:54:57Z application/pdf https://hdl.handle.net/1956/23853 https://doi.org/10.1016/j.dsr2.2019.104691 eng eng Elsevier Norges forskningsråd: 203871 EC/FP7: 264933 urn:issn:0967-0645 urn:issn:1879-0100 https://hdl.handle.net/1956/23853 https://doi.org/10.1016/j.dsr2.2019.104691 cristin:1771525 Attribution-Non Commercial-No Derivatives CC BY-NC-ND http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright 2019 The Authors Deep-sea research. Part II, Topical studies in oceanography Peer reviewed Journal article 2020 ftunivbergen https://doi.org/10.1016/j.dsr2.2019.104691 2023-03-14T17:41:37Z Distribution of micronekton was investigated during early summer of 2013, using data from a cruise covering the central parts of four north Atlantic basins, the Norwegian Sea (NS), Iceland Sea (ICS), Irminger Sea (IRS), and Labrador Sea (LS). Continuous underway acoustics mapped vertical and horizontal distributions, and trawl sampling provided data on biomass and taxonomic composition. The hull mounted acoustics and trawl catches suggested that, among the four basins, biomass of epipelagic, larger nektonic species (>20 cm length) during the cruise was highest in the NS and ICS basins, while mesopelagic non-gelatinous micronekton biomass peaked in the IRS and LS basins. Biomass of Scyphozoa was also about 1 order of magnitude higher in IRS and LS compared to ICS and NS. In ICS and NS, crustaceans made up about 50% of total non-gelatinous micronekton biomass, with fish making up less than 20% of total biomass. In contrast, fish constituted more than 60% of non-gelatinous biomass of catches in IRS and LS. In catches from ICS and NS the myctophid Benthosema glaciale dominated the catches, whereas bathylagids, gonostomatids, barracudinas and stomiids contributed to the high biomass densities of fish in IRS and LS. In addition to the differences in biomass between the basins, the acoustic measurements suggested gradients within the north-eastern basins, and large differences in vertical distribution of biomass between the basins during the cruise. publishedVersion Article in Journal/Newspaper Iceland Labrador Sea North Atlantic Norwegian Sea University of Bergen: Bergen Open Research Archive (BORA-UiB) Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Norwegian Sea Deep Sea Research Part II: Topical Studies in Oceanography 180 104691 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
Distribution of micronekton was investigated during early summer of 2013, using data from a cruise covering the central parts of four north Atlantic basins, the Norwegian Sea (NS), Iceland Sea (ICS), Irminger Sea (IRS), and Labrador Sea (LS). Continuous underway acoustics mapped vertical and horizontal distributions, and trawl sampling provided data on biomass and taxonomic composition. The hull mounted acoustics and trawl catches suggested that, among the four basins, biomass of epipelagic, larger nektonic species (>20 cm length) during the cruise was highest in the NS and ICS basins, while mesopelagic non-gelatinous micronekton biomass peaked in the IRS and LS basins. Biomass of Scyphozoa was also about 1 order of magnitude higher in IRS and LS compared to ICS and NS. In ICS and NS, crustaceans made up about 50% of total non-gelatinous micronekton biomass, with fish making up less than 20% of total biomass. In contrast, fish constituted more than 60% of non-gelatinous biomass of catches in IRS and LS. In catches from ICS and NS the myctophid Benthosema glaciale dominated the catches, whereas bathylagids, gonostomatids, barracudinas and stomiids contributed to the high biomass densities of fish in IRS and LS. In addition to the differences in biomass between the basins, the acoustic measurements suggested gradients within the north-eastern basins, and large differences in vertical distribution of biomass between the basins during the cruise. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Klevjer, Thor A. Melle, Webjørn Raunsgård Knutsen, Tor Strand, Espen Korneliussen, Rolf Dupont, Nicolas Salvanes, Anne Gro Vea Wiebe, Peter H. |
spellingShingle |
Klevjer, Thor A. Melle, Webjørn Raunsgård Knutsen, Tor Strand, Espen Korneliussen, Rolf Dupont, Nicolas Salvanes, Anne Gro Vea Wiebe, Peter H. Micronekton biomass distribution, improved estimates across four north Atlantic basins |
author_facet |
Klevjer, Thor A. Melle, Webjørn Raunsgård Knutsen, Tor Strand, Espen Korneliussen, Rolf Dupont, Nicolas Salvanes, Anne Gro Vea Wiebe, Peter H. |
author_sort |
Klevjer, Thor A. |
title |
Micronekton biomass distribution, improved estimates across four north Atlantic basins |
title_short |
Micronekton biomass distribution, improved estimates across four north Atlantic basins |
title_full |
Micronekton biomass distribution, improved estimates across four north Atlantic basins |
title_fullStr |
Micronekton biomass distribution, improved estimates across four north Atlantic basins |
title_full_unstemmed |
Micronekton biomass distribution, improved estimates across four north Atlantic basins |
title_sort |
micronekton biomass distribution, improved estimates across four north atlantic basins |
publisher |
Elsevier |
publishDate |
2020 |
url |
https://hdl.handle.net/1956/23853 https://doi.org/10.1016/j.dsr2.2019.104691 |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Irminger Sea Norwegian Sea |
geographic_facet |
Irminger Sea Norwegian Sea |
genre |
Iceland Labrador Sea North Atlantic Norwegian Sea |
genre_facet |
Iceland Labrador Sea North Atlantic Norwegian Sea |
op_source |
Deep-sea research. Part II, Topical studies in oceanography |
op_relation |
Norges forskningsråd: 203871 EC/FP7: 264933 urn:issn:0967-0645 urn:issn:1879-0100 https://hdl.handle.net/1956/23853 https://doi.org/10.1016/j.dsr2.2019.104691 cristin:1771525 |
op_rights |
Attribution-Non Commercial-No Derivatives CC BY-NC-ND http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright 2019 The Authors |
op_doi |
https://doi.org/10.1016/j.dsr2.2019.104691 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
180 |
container_start_page |
104691 |
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1766041173969862656 |