Acoustic insights into the zooplankton dynamics of the eastern Weddell Sea
The success of any efforts to determine the effects of climate change on marine ecosystems depends on understanding in the first instance the natural variations, which contemporarily occur on the interannual and shorter time scales. Here we present results on the environmental controls of zooplankto...
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ftopenagrar:oai:www.openagrar.de:timport_mods_00013674 2024-09-15T18:31:19+00:00 Acoustic insights into the zooplankton dynamics of the eastern Weddell Sea Cisewski, Boris Strass, Volker H. 2016 50 https://doi.org/10.1016/j.pocean.2016.03.005 https://www.openagrar.de/receive/timport_mods_00013674 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00013674/dn056591.pdf eng eng Progress in oceanography -- Prog. Oceanog. -- Prog. Oceanogr. -- Prog. Oceanogr. (GB) -- 0079-6611 -- 4062-9 https://doi.org/DOI:10.1016/j.pocean.2016.03.005 https://www.openagrar.de/receive/timport_mods_00013674 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00013674/dn056591.pdf only signed in user info:eu-repo/semantics/restrictedAccess article Text article Text doc-type:article 2016 ftopenagrar https://doi.org/10.1016/j.pocean.2016.03.005 2024-07-08T23:56:24Z The success of any efforts to determine the effects of climate change on marine ecosystems depends on understanding in the first instance the natural variations, which contemporarily occur on the interannual and shorter time scales. Here we present results on the environmental controls of zooplankton distribution patterns and behaviour in the eastern Weddell Sea, Southern Ocean. Zooplankton abundance and vertical migration are derived from the mean volume backscattering strength (MVBS) and the vertical velocity measured by moored acoustic Doppler current profilers (ADCPs), which were deployed simultaneously at 64°S, 66.5°S and 69°S along the Greenwich Meridian from February, 2005, until March, 2008. While these time series span a period of full three years they resolve hourly changes. A highly persistent behavioural pattern found at all three mooring locations is the synchronous diel vertical migration (DVM) of two distinct groups of zooplankton that migrate between a deep residence depth during daytime and a shallow depth during nighttime. The DVM was closely coupled to the astronomical daylight cycles. However, while the DVM was symmetric around local noon, the annual modulation of the DVM was clearly asymmetric around winter solstice or summer solstice, respectively, at all three mooring sites. DVM at our observation sites persisted throughout winter, even at the highest latitude exposed to the polar night. Since the magnitude as well as the relative rate of change of illumination is minimal at this time, we propose that the ultimate causes of DVM separated from the lightmediated proximal cue that coordinates it. In all three years, a marked change in the migration behaviour occurred in late spring (late October/early November), when DVM ceased. The complete suspension of DVM after early November is possibly caused by the combination of two factors: (1) increased availability of food in the surface mixed layer provided by the phytoplankton spring bloom, and (2) vanishing diurnal enhancement of the threat from ... Article in Journal/Newspaper polar night Southern Ocean Weddell Sea OpenAgrar (OA) Progress in Oceanography 144 62 92 |
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article Text Cisewski, Boris Strass, Volker H. Acoustic insights into the zooplankton dynamics of the eastern Weddell Sea |
topic_facet |
article Text |
description |
The success of any efforts to determine the effects of climate change on marine ecosystems depends on understanding in the first instance the natural variations, which contemporarily occur on the interannual and shorter time scales. Here we present results on the environmental controls of zooplankton distribution patterns and behaviour in the eastern Weddell Sea, Southern Ocean. Zooplankton abundance and vertical migration are derived from the mean volume backscattering strength (MVBS) and the vertical velocity measured by moored acoustic Doppler current profilers (ADCPs), which were deployed simultaneously at 64°S, 66.5°S and 69°S along the Greenwich Meridian from February, 2005, until March, 2008. While these time series span a period of full three years they resolve hourly changes. A highly persistent behavioural pattern found at all three mooring locations is the synchronous diel vertical migration (DVM) of two distinct groups of zooplankton that migrate between a deep residence depth during daytime and a shallow depth during nighttime. The DVM was closely coupled to the astronomical daylight cycles. However, while the DVM was symmetric around local noon, the annual modulation of the DVM was clearly asymmetric around winter solstice or summer solstice, respectively, at all three mooring sites. DVM at our observation sites persisted throughout winter, even at the highest latitude exposed to the polar night. Since the magnitude as well as the relative rate of change of illumination is minimal at this time, we propose that the ultimate causes of DVM separated from the lightmediated proximal cue that coordinates it. In all three years, a marked change in the migration behaviour occurred in late spring (late October/early November), when DVM ceased. The complete suspension of DVM after early November is possibly caused by the combination of two factors: (1) increased availability of food in the surface mixed layer provided by the phytoplankton spring bloom, and (2) vanishing diurnal enhancement of the threat from ... |
format |
Article in Journal/Newspaper |
author |
Cisewski, Boris Strass, Volker H. |
author_facet |
Cisewski, Boris Strass, Volker H. |
author_sort |
Cisewski, Boris |
title |
Acoustic insights into the zooplankton dynamics of the eastern Weddell Sea |
title_short |
Acoustic insights into the zooplankton dynamics of the eastern Weddell Sea |
title_full |
Acoustic insights into the zooplankton dynamics of the eastern Weddell Sea |
title_fullStr |
Acoustic insights into the zooplankton dynamics of the eastern Weddell Sea |
title_full_unstemmed |
Acoustic insights into the zooplankton dynamics of the eastern Weddell Sea |
title_sort |
acoustic insights into the zooplankton dynamics of the eastern weddell sea |
publishDate |
2016 |
url |
https://doi.org/10.1016/j.pocean.2016.03.005 https://www.openagrar.de/receive/timport_mods_00013674 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00013674/dn056591.pdf |
genre |
polar night Southern Ocean Weddell Sea |
genre_facet |
polar night Southern Ocean Weddell Sea |
op_relation |
Progress in oceanography -- Prog. Oceanog. -- Prog. Oceanogr. -- Prog. Oceanogr. (GB) -- 0079-6611 -- 4062-9 https://doi.org/DOI:10.1016/j.pocean.2016.03.005 https://www.openagrar.de/receive/timport_mods_00013674 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00013674/dn056591.pdf |
op_rights |
only signed in user info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.pocean.2016.03.005 |
container_title |
Progress in Oceanography |
container_volume |
144 |
container_start_page |
62 |
op_container_end_page |
92 |
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1810472941278724096 |