Diel vertical migration of zooplankton in the Northeast Atlantic
Acoustic Doppler current profiler (ADCP) data collected during August–September 1991 reveal the diel migration of zooplankton in the northeast Atlantic (50–60δN, 10–40δW). Volume scattering strength has been calculated, from which the speed and depth of migrations have been studied. There are usuall...
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Oxford University Press
1996
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fthighwire:oai:open-archive.highwire.org:plankt:18/2/163 2023-05-15T17:41:10+02:00 Diel vertical migration of zooplankton in the Northeast Atlantic Heywood, Karen J. 1996-02-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/18/2/163 https://doi.org/10.1093/plankt/18.2.163 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/18/2/163 http://dx.doi.org/10.1093/plankt/18.2.163 Copyright (C) 1996, Oxford University Press ORIGINAL ARTICLES TEXT 1996 fthighwire https://doi.org/10.1093/plankt/18.2.163 2007-06-24T12:43:04Z Acoustic Doppler current profiler (ADCP) data collected during August–September 1991 reveal the diel migration of zooplankton in the northeast Atlantic (50–60δN, 10–40δW). Volume scattering strength has been calculated, from which the speed and depth of migrations have been studied. There are usually at least two layers displaying nocturnal migration, one spending the day at depths of 300–400 m and the other at depths of 50–100 m. Reverse migrations are also found to be a common occurrence in the region studied. Usually, a surface layer begins to descend at dusk as soon as the upward migrating layer arrives in surface waters. Vertical velocity measured from the ADCP provides the first detailed direct measurements of the swimming speeds of the populations in situ , which are generally between 2 and 6cm s−1. Migrating animals within layers do not move in unison; the animals at the leading edge are moving back towards the centre of the layer. Text Northeast Atlantic HighWire Press (Stanford University) Journal of Plankton Research 18 2 163 184 |
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HighWire Press (Stanford University) |
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fthighwire |
language |
English |
topic |
ORIGINAL ARTICLES |
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ORIGINAL ARTICLES Heywood, Karen J. Diel vertical migration of zooplankton in the Northeast Atlantic |
topic_facet |
ORIGINAL ARTICLES |
description |
Acoustic Doppler current profiler (ADCP) data collected during August–September 1991 reveal the diel migration of zooplankton in the northeast Atlantic (50–60δN, 10–40δW). Volume scattering strength has been calculated, from which the speed and depth of migrations have been studied. There are usually at least two layers displaying nocturnal migration, one spending the day at depths of 300–400 m and the other at depths of 50–100 m. Reverse migrations are also found to be a common occurrence in the region studied. Usually, a surface layer begins to descend at dusk as soon as the upward migrating layer arrives in surface waters. Vertical velocity measured from the ADCP provides the first detailed direct measurements of the swimming speeds of the populations in situ , which are generally between 2 and 6cm s−1. Migrating animals within layers do not move in unison; the animals at the leading edge are moving back towards the centre of the layer. |
format |
Text |
author |
Heywood, Karen J. |
author_facet |
Heywood, Karen J. |
author_sort |
Heywood, Karen J. |
title |
Diel vertical migration of zooplankton in the Northeast Atlantic |
title_short |
Diel vertical migration of zooplankton in the Northeast Atlantic |
title_full |
Diel vertical migration of zooplankton in the Northeast Atlantic |
title_fullStr |
Diel vertical migration of zooplankton in the Northeast Atlantic |
title_full_unstemmed |
Diel vertical migration of zooplankton in the Northeast Atlantic |
title_sort |
diel vertical migration of zooplankton in the northeast atlantic |
publisher |
Oxford University Press |
publishDate |
1996 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/18/2/163 https://doi.org/10.1093/plankt/18.2.163 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/18/2/163 http://dx.doi.org/10.1093/plankt/18.2.163 |
op_rights |
Copyright (C) 1996, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/18.2.163 |
container_title |
Journal of Plankton Research |
container_volume |
18 |
container_issue |
2 |
container_start_page |
163 |
op_container_end_page |
184 |
_version_ |
1766142515315998720 |