Supplementary material from "Large mesopelagic fish biomass in the Southern Ocean resolved by acoustic properties"
The oceanic mesopelagic zone, 200–1000 m below sea level, holds abundant small fishes that play central roles in ecosystem function. Global mesopelagic fish biomass estimates are increasingly derived using active acoustics, where echosounder-generated signals are emitted, reflected by pelagic organi...
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The Royal Society
2021
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Online Access: | https://dx.doi.org/10.6084/m9.figshare.c.5772178 https://rs.figshare.com/collections/Supplementary_material_from_Large_mesopelagic_fish_biomass_in_the_Southern_Ocean_resolved_by_acoustic_properties_/5772178 |
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ftdatacite:10.6084/m9.figshare.c.5772178 2023-05-15T13:44:14+02:00 Supplementary material from "Large mesopelagic fish biomass in the Southern Ocean resolved by acoustic properties" Dornan, Tracey Fielding, Sophie Saunders, Ryan A. Genner, Martin J. 2021 https://dx.doi.org/10.6084/m9.figshare.c.5772178 https://rs.figshare.com/collections/Supplementary_material_from_Large_mesopelagic_fish_biomass_in_the_Southern_Ocean_resolved_by_acoustic_properties_/5772178 unknown The Royal Society https://dx.doi.org/10.1098/rspb.2021.1781 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Environmental Science Ecology FOS Biological sciences Collection article 2021 ftdatacite https://doi.org/10.6084/m9.figshare.c.5772178 https://doi.org/10.1098/rspb.2021.1781 2022-02-08T18:19:23Z The oceanic mesopelagic zone, 200–1000 m below sea level, holds abundant small fishes that play central roles in ecosystem function. Global mesopelagic fish biomass estimates are increasingly derived using active acoustics, where echosounder-generated signals are emitted, reflected by pelagic organisms and detected by transducers on vessels. Previous studies have interpreted a ubiquitous decline in acoustic reflectance towards the Antarctic continent as a reduction in mesopelagic fish biomass. Here, we use empirical data to estimate species-specific acoustic target strength for the dominant mesopelagic fish of the Scotia Sea in the Southern Ocean. We use these data, alongside estimates of fish relative abundance from net surveys, to interpret signals received in acoustic surveys and calculate mesopelagic biomass of the broader Southern Ocean. We estimate the Southern Ocean mesopelagic fish biomass to be approximately 274 million tonnes if Antarctic krill contribute to the acoustic signal, or 570 million tonnes if mesopelagic fish alone are responsible. These quantities are approximately 1.8 and 3.8 times greater than previous net-based biomass estimates. We also show a peak in fish biomass towards the seasonal ice-edge, corresponding to the preferred feeding grounds of penguins and seals, which may be at risk under future climate change scenarios. Our study provides new insights into the abundance and distributions of ecologically significant mesopelagic fish stocks across the Southern Ocean ecosystem. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Scotia Sea Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean The Antarctic Scotia Sea |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Environmental Science Ecology FOS Biological sciences |
spellingShingle |
Environmental Science Ecology FOS Biological sciences Dornan, Tracey Fielding, Sophie Saunders, Ryan A. Genner, Martin J. Supplementary material from "Large mesopelagic fish biomass in the Southern Ocean resolved by acoustic properties" |
topic_facet |
Environmental Science Ecology FOS Biological sciences |
description |
The oceanic mesopelagic zone, 200–1000 m below sea level, holds abundant small fishes that play central roles in ecosystem function. Global mesopelagic fish biomass estimates are increasingly derived using active acoustics, where echosounder-generated signals are emitted, reflected by pelagic organisms and detected by transducers on vessels. Previous studies have interpreted a ubiquitous decline in acoustic reflectance towards the Antarctic continent as a reduction in mesopelagic fish biomass. Here, we use empirical data to estimate species-specific acoustic target strength for the dominant mesopelagic fish of the Scotia Sea in the Southern Ocean. We use these data, alongside estimates of fish relative abundance from net surveys, to interpret signals received in acoustic surveys and calculate mesopelagic biomass of the broader Southern Ocean. We estimate the Southern Ocean mesopelagic fish biomass to be approximately 274 million tonnes if Antarctic krill contribute to the acoustic signal, or 570 million tonnes if mesopelagic fish alone are responsible. These quantities are approximately 1.8 and 3.8 times greater than previous net-based biomass estimates. We also show a peak in fish biomass towards the seasonal ice-edge, corresponding to the preferred feeding grounds of penguins and seals, which may be at risk under future climate change scenarios. Our study provides new insights into the abundance and distributions of ecologically significant mesopelagic fish stocks across the Southern Ocean ecosystem. |
format |
Article in Journal/Newspaper |
author |
Dornan, Tracey Fielding, Sophie Saunders, Ryan A. Genner, Martin J. |
author_facet |
Dornan, Tracey Fielding, Sophie Saunders, Ryan A. Genner, Martin J. |
author_sort |
Dornan, Tracey |
title |
Supplementary material from "Large mesopelagic fish biomass in the Southern Ocean resolved by acoustic properties" |
title_short |
Supplementary material from "Large mesopelagic fish biomass in the Southern Ocean resolved by acoustic properties" |
title_full |
Supplementary material from "Large mesopelagic fish biomass in the Southern Ocean resolved by acoustic properties" |
title_fullStr |
Supplementary material from "Large mesopelagic fish biomass in the Southern Ocean resolved by acoustic properties" |
title_full_unstemmed |
Supplementary material from "Large mesopelagic fish biomass in the Southern Ocean resolved by acoustic properties" |
title_sort |
supplementary material from "large mesopelagic fish biomass in the southern ocean resolved by acoustic properties" |
publisher |
The Royal Society |
publishDate |
2021 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.5772178 https://rs.figshare.com/collections/Supplementary_material_from_Large_mesopelagic_fish_biomass_in_the_Southern_Ocean_resolved_by_acoustic_properties_/5772178 |
geographic |
Antarctic Southern Ocean The Antarctic Scotia Sea |
geographic_facet |
Antarctic Southern Ocean The Antarctic Scotia Sea |
genre |
Antarc* Antarctic Antarctic Krill Scotia Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Scotia Sea Southern Ocean |
op_relation |
https://dx.doi.org/10.1098/rspb.2021.1781 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.5772178 https://doi.org/10.1098/rspb.2021.1781 |
_version_ |
1766199188542980096 |