Data from: Oceanic swarms of Antarctic krill perform satiation sinking
Antarctic krill form some of the highest concentrations of animal biomass observed in the world’s ocean potentially due to their prolific ability to swarm. Determining the movement of Antarctic krill within swarms is important to identify drivers of their behaviour and their biogeochemical impact on...
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Online Access: | https://doi.org/10.5061/dryad.p46k6 |
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fttriple:oai:gotriple.eu:50|dedup_wf_001::9f6585b4ad2942120591b0981b1e710a 2023-05-15T13:44:33+02:00 Data from: Oceanic swarms of Antarctic krill perform satiation sinking Tarling, Geraint A. Thorpe, Sally E. 2017-01-01 https://doi.org/10.5061/dryad.p46k6 en eng Dryad http://dx.doi.org/10.5061/dryad.p46k6 https://dx.doi.org/10.5061/dryad.p46k6 lic_creative-commons 10.5061/dryad.p46k6 oai:easy.dans.knaw.nl:easy-dataset:98254 oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:98254 10|openaire____::9e3be59865b2c1c335d32dae2fe7b254 10|re3data_____::94816e6421eeb072e7742ce6a9decc5f 10|re3data_____::84e123776089ce3c7a33db98d9cd15a8 10|eurocrisdris::fe4903425d9040f680d8610d9079ea14 re3data_____::r3d100000044 10|openaire____::081b82f96300b6a6e3d282bad31cb6e2 10|opendoar____::8b6dd7db9af49e67306feb59a8bdc52c krill Euphausia superba Diel periodicity Satiation sinking Holocene Acoustic Doppler Current Profiler feeding Life sciences medicine and health care Southern Ocean Scotia Sea South Georgia geo envir Dataset https://vocabularies.coar-repositories.org/resource_types/c_ddb1/ 2017 fttriple https://doi.org/10.5061/dryad.p46k6 2023-01-22T17:23:17Z Antarctic krill form some of the highest concentrations of animal biomass observed in the world’s ocean potentially due to their prolific ability to swarm. Determining the movement of Antarctic krill within swarms is important to identify drivers of their behaviour and their biogeochemical impact on their environment. We examined vertical velocity within approximately 2000 krill swarms through the combined use of a shipborne echosounder and an acoustic Doppler current profiler (ADCP). We revealed a pronounced downward anomaly in vertical velocity within swarms of -0.6 cm.s-1 compared with vertical motion outside the swarm. The anomaly changed over the diel cycle, with smaller downward anomalies occurring at night. Swarms in regions of high phytoplankton concentrations (a proxy for food availability) also exhibited significantly smaller downward anomalies. We propose that the anomaly is the result of downward velocities generated by the action of krill beating their swimming appendages. During the night and in high phytoplankton availability, when krill are more likely to feed to the point of satiation, swimming activity is lowered and the anomaly is reduced. Our findings are consistent with laboratory work where krill ceased swimming and adopted a parachute posture when sated. Satiation sinking behaviour can substantially increase the efficiency of carbon transport to depth through depositing faecal pellets at the bottom of swarms, avoiding the reingestion and breakup of pellets by other swarm members. Antarctic krill swarms in Scotia Sea Summer 2003The dataset contains 2043 krill swarms detected using an EK60 echosounder during transects of the Scotia Sea during Jan and Feb 2003. Each of the swarms was detected using the dB difference method described in Tarling et al. 2009. Corresponding measurements of the vertical velocity within and above and below each swarm were made using an acoustic Doppler current profiler (ADCP). Velocities above and below the swarm were taken from velocities within the swarm to ... Dataset Antarc* Antarctic Antarctic Krill Euphausia superba Scotia Sea Southern Ocean Unknown Antarctic Southern Ocean Scotia Sea |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
krill Euphausia superba Diel periodicity Satiation sinking Holocene Acoustic Doppler Current Profiler feeding Life sciences medicine and health care Southern Ocean Scotia Sea South Georgia geo envir |
spellingShingle |
krill Euphausia superba Diel periodicity Satiation sinking Holocene Acoustic Doppler Current Profiler feeding Life sciences medicine and health care Southern Ocean Scotia Sea South Georgia geo envir Tarling, Geraint A. Thorpe, Sally E. Data from: Oceanic swarms of Antarctic krill perform satiation sinking |
topic_facet |
krill Euphausia superba Diel periodicity Satiation sinking Holocene Acoustic Doppler Current Profiler feeding Life sciences medicine and health care Southern Ocean Scotia Sea South Georgia geo envir |
description |
Antarctic krill form some of the highest concentrations of animal biomass observed in the world’s ocean potentially due to their prolific ability to swarm. Determining the movement of Antarctic krill within swarms is important to identify drivers of their behaviour and their biogeochemical impact on their environment. We examined vertical velocity within approximately 2000 krill swarms through the combined use of a shipborne echosounder and an acoustic Doppler current profiler (ADCP). We revealed a pronounced downward anomaly in vertical velocity within swarms of -0.6 cm.s-1 compared with vertical motion outside the swarm. The anomaly changed over the diel cycle, with smaller downward anomalies occurring at night. Swarms in regions of high phytoplankton concentrations (a proxy for food availability) also exhibited significantly smaller downward anomalies. We propose that the anomaly is the result of downward velocities generated by the action of krill beating their swimming appendages. During the night and in high phytoplankton availability, when krill are more likely to feed to the point of satiation, swimming activity is lowered and the anomaly is reduced. Our findings are consistent with laboratory work where krill ceased swimming and adopted a parachute posture when sated. Satiation sinking behaviour can substantially increase the efficiency of carbon transport to depth through depositing faecal pellets at the bottom of swarms, avoiding the reingestion and breakup of pellets by other swarm members. Antarctic krill swarms in Scotia Sea Summer 2003The dataset contains 2043 krill swarms detected using an EK60 echosounder during transects of the Scotia Sea during Jan and Feb 2003. Each of the swarms was detected using the dB difference method described in Tarling et al. 2009. Corresponding measurements of the vertical velocity within and above and below each swarm were made using an acoustic Doppler current profiler (ADCP). Velocities above and below the swarm were taken from velocities within the swarm to ... |
format |
Dataset |
author |
Tarling, Geraint A. Thorpe, Sally E. |
author_facet |
Tarling, Geraint A. Thorpe, Sally E. |
author_sort |
Tarling, Geraint A. |
title |
Data from: Oceanic swarms of Antarctic krill perform satiation sinking |
title_short |
Data from: Oceanic swarms of Antarctic krill perform satiation sinking |
title_full |
Data from: Oceanic swarms of Antarctic krill perform satiation sinking |
title_fullStr |
Data from: Oceanic swarms of Antarctic krill perform satiation sinking |
title_full_unstemmed |
Data from: Oceanic swarms of Antarctic krill perform satiation sinking |
title_sort |
data from: oceanic swarms of antarctic krill perform satiation sinking |
publisher |
Dryad |
publishDate |
2017 |
url |
https://doi.org/10.5061/dryad.p46k6 |
geographic |
Antarctic Southern Ocean Scotia Sea |
geographic_facet |
Antarctic Southern Ocean Scotia Sea |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Scotia Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Scotia Sea Southern Ocean |
op_source |
10.5061/dryad.p46k6 oai:easy.dans.knaw.nl:easy-dataset:98254 oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:98254 10|openaire____::9e3be59865b2c1c335d32dae2fe7b254 10|re3data_____::94816e6421eeb072e7742ce6a9decc5f 10|re3data_____::84e123776089ce3c7a33db98d9cd15a8 10|eurocrisdris::fe4903425d9040f680d8610d9079ea14 re3data_____::r3d100000044 10|openaire____::081b82f96300b6a6e3d282bad31cb6e2 10|opendoar____::8b6dd7db9af49e67306feb59a8bdc52c |
op_relation |
http://dx.doi.org/10.5061/dryad.p46k6 https://dx.doi.org/10.5061/dryad.p46k6 |
op_rights |
lic_creative-commons |
op_doi |
https://doi.org/10.5061/dryad.p46k6 |
_version_ |
1766203044656054272 |