Effects of Hydrographic Variability on the Spatial, Seasonal and Diel Diving Patterns of Southern Elephant
Weddell Sea hydrography and circulation is driven by influx of Circumpolar Deep Water (CDW) from the Antarctic Circumpolar Current (ACC) at its eastern margin. Entrainment and upwelling of this high-nutrient, oxygen-depleted water mass within the Weddell Gyre also supports the mesopelagic ecosystem...
Main Authors: | , , , , , , , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.349.2574 |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.349.2574 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.349.2574 2023-05-15T14:02:09+02:00 Effects of Hydrographic Variability on the Spatial, Seasonal and Diel Diving Patterns of Southern Elephant Seals Eastern Weddell Sea Martin Biuw Ole Anders Nøst Audun Stien Qin Zhou Christian Lydersen Kit M. Kovacs The Pennsylvania State University CiteSeerX Archives application/zip http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.349.2574 en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.349.2574 Metadata may be used without restrictions as long as the oai identifier remains attached to it. ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/c0/6a/PLoS_One_2010_Nov_3_5(11)_e13816.tar.gz text ftciteseerx 2016-01-08T00:14:06Z Weddell Sea hydrography and circulation is driven by influx of Circumpolar Deep Water (CDW) from the Antarctic Circumpolar Current (ACC) at its eastern margin. Entrainment and upwelling of this high-nutrient, oxygen-depleted water mass within the Weddell Gyre also supports the mesopelagic ecosystem within the gyre and the rich benthic community along the Antarctic shelf. We used Conductivity-Temperature-Depth Satellite Relay Data Loggers (CTD-SRDLs) to examine the importance of hydrographic variability, ice cover and season on the movements and diving behavior of southern elephant seals in the eastern Weddell Sea region during their overwinter feeding trips from Bouvetøya. We developed a model describing diving depth as a function of local time of day to account for diel variation in diving behavior. Seals feeding in pelagic ice-free waters during the summer months displayed clear diel variation, with daytime dives reaching 500-1500 m and night-time targeting of the subsurface temperature and salinity maxima characteristic of CDW around 150–300 meters. This pattern was especially clear in the Weddell Cold and Warm Regimes within the gyre, occurred in the ACC, but was absent at the Dronning Maud Land shelf region where seals fed benthically. Diel variation was almost absent in pelagic feeding areas covered by winter sea ice, where seals targeted deep layers around 500–700 meters. Thus, elephant seals appear to switch between feeding strategies when moving between oceanic regimes or in response to seasonal environmental conditions. While they are on the shelf, they exploit the locally-rich benthic ecosystem, while diel patterns in pelagic waters in summer are probably a response to strong Text Antarc* Antarctic Bouvetøya Dronning Maud Land Elephant Seals Sea ice Southern Elephant Seals Weddell Sea Unknown Antarctic The Antarctic Weddell Sea Dronning Maud Land Weddell Bouvetøya ENVELOPE(3.358,3.358,-54.422,-54.422) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
Weddell Sea hydrography and circulation is driven by influx of Circumpolar Deep Water (CDW) from the Antarctic Circumpolar Current (ACC) at its eastern margin. Entrainment and upwelling of this high-nutrient, oxygen-depleted water mass within the Weddell Gyre also supports the mesopelagic ecosystem within the gyre and the rich benthic community along the Antarctic shelf. We used Conductivity-Temperature-Depth Satellite Relay Data Loggers (CTD-SRDLs) to examine the importance of hydrographic variability, ice cover and season on the movements and diving behavior of southern elephant seals in the eastern Weddell Sea region during their overwinter feeding trips from Bouvetøya. We developed a model describing diving depth as a function of local time of day to account for diel variation in diving behavior. Seals feeding in pelagic ice-free waters during the summer months displayed clear diel variation, with daytime dives reaching 500-1500 m and night-time targeting of the subsurface temperature and salinity maxima characteristic of CDW around 150–300 meters. This pattern was especially clear in the Weddell Cold and Warm Regimes within the gyre, occurred in the ACC, but was absent at the Dronning Maud Land shelf region where seals fed benthically. Diel variation was almost absent in pelagic feeding areas covered by winter sea ice, where seals targeted deep layers around 500–700 meters. Thus, elephant seals appear to switch between feeding strategies when moving between oceanic regimes or in response to seasonal environmental conditions. While they are on the shelf, they exploit the locally-rich benthic ecosystem, while diel patterns in pelagic waters in summer are probably a response to strong |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Seals Eastern Weddell Sea Martin Biuw Ole Anders Nøst Audun Stien Qin Zhou Christian Lydersen Kit M. Kovacs |
spellingShingle |
Seals Eastern Weddell Sea Martin Biuw Ole Anders Nøst Audun Stien Qin Zhou Christian Lydersen Kit M. Kovacs Effects of Hydrographic Variability on the Spatial, Seasonal and Diel Diving Patterns of Southern Elephant |
author_facet |
Seals Eastern Weddell Sea Martin Biuw Ole Anders Nøst Audun Stien Qin Zhou Christian Lydersen Kit M. Kovacs |
author_sort |
Seals Eastern |
title |
Effects of Hydrographic Variability on the Spatial, Seasonal and Diel Diving Patterns of Southern Elephant |
title_short |
Effects of Hydrographic Variability on the Spatial, Seasonal and Diel Diving Patterns of Southern Elephant |
title_full |
Effects of Hydrographic Variability on the Spatial, Seasonal and Diel Diving Patterns of Southern Elephant |
title_fullStr |
Effects of Hydrographic Variability on the Spatial, Seasonal and Diel Diving Patterns of Southern Elephant |
title_full_unstemmed |
Effects of Hydrographic Variability on the Spatial, Seasonal and Diel Diving Patterns of Southern Elephant |
title_sort |
effects of hydrographic variability on the spatial, seasonal and diel diving patterns of southern elephant |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.349.2574 |
long_lat |
ENVELOPE(3.358,3.358,-54.422,-54.422) |
geographic |
Antarctic The Antarctic Weddell Sea Dronning Maud Land Weddell Bouvetøya |
geographic_facet |
Antarctic The Antarctic Weddell Sea Dronning Maud Land Weddell Bouvetøya |
genre |
Antarc* Antarctic Bouvetøya Dronning Maud Land Elephant Seals Sea ice Southern Elephant Seals Weddell Sea |
genre_facet |
Antarc* Antarctic Bouvetøya Dronning Maud Land Elephant Seals Sea ice Southern Elephant Seals Weddell Sea |
op_source |
ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/c0/6a/PLoS_One_2010_Nov_3_5(11)_e13816.tar.gz |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.349.2574 |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766272253991845888 |