Southern elephant seal trajectories, fronts and eddies in the Brazil/Malvinas Confluence
This study describes the association between transient, mesoscale hydrographic features along the axis of the Brazil-Malvinas Confluence, in the SW Atlantic, and the foraging behavior of 2-3-year-old (focal) juvenile southern elephant seals, Mirounga leonina, from Península Valdés, Argentina. Depart...
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2006
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670637_v53_n12_p1907_Campagna http://hdl.handle.net/20.500.12110/paper_09670637_v53_n12_p1907_Campagna |
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paper:paper_09670637_v53_n12_p1907_Campagna2023-06-08T15:58:41Z Southern elephant seal trajectories, fronts and eddies in the Brazil/Malvinas Confluence Eddies (oceanic) Foraging behavior Mirounga leonina Oceanic fronts Telemetry Temporal distribution Bathymetry Coastal zones Eddy currents Ocean currents Seals Telemetering Eddies (oceanic) Foraging behavior Mirounga leonina Temporal distribution Seawater biotelemetry current direction diurnal variation diving behavior eddy foraging behavior hydrography juvenile movement oceanic front pinniped temperature gradient trajectory Argentina Argentine Basin Atlantic islands Atlantic Ocean Chubut Falkland Islands (Malvinas) Patagonian Shelf South America Valdes Peninsula Mirounga leonina This study describes the association between transient, mesoscale hydrographic features along the axis of the Brazil-Malvinas Confluence, in the SW Atlantic, and the foraging behavior of 2-3-year-old (focal) juvenile southern elephant seals, Mirounga leonina, from Península Valdés, Argentina. Departing from the dominant pattern of foraging on predictable bathymetric fronts on the Patagonian shelf and slope, three females out of 12 satellite-tracked juveniles remained at the edge of young warm-core eddies and near the outer core of cold-core eddies, coinciding with the most productive areas of these temperature fronts. Seal trajectories along high-temperature gradients were always consistent with the speed and direction of surface currents inferred from the temperature distribution and confirmed by surface drifters. Movements of foraging seals were compared with those of surface drifters, coinciding in time and space and yielding independent and consistent data on regional water circulation parameters. The diving pattern recorded for one focal seal yielded shallower dives and a loose diel pattern in the eddy, and a marked diurnal cycle compatible with foraging on vertically migrating prey in the cold waters of the Malvinas Current. Pre-reproductive females that use the mesoscale fronts of the Argentine Basin as an alternative foraging area would benefit from lower competition with more experienced seals and with other top predators that reproduce along the coast of Patagonia. © 2006 Elsevier Ltd. All rights reserved. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670637_v53_n12_p1907_Campagna http://hdl.handle.net/20.500.12110/paper_09670637_v53_n12_p1907_Campagna |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Eddies (oceanic) Foraging behavior Mirounga leonina Oceanic fronts Telemetry Temporal distribution Bathymetry Coastal zones Eddy currents Ocean currents Seals Telemetering Eddies (oceanic) Foraging behavior Mirounga leonina Temporal distribution Seawater biotelemetry current direction diurnal variation diving behavior eddy foraging behavior hydrography juvenile movement oceanic front pinniped temperature gradient trajectory Argentina Argentine Basin Atlantic islands Atlantic Ocean Chubut Falkland Islands (Malvinas) Patagonian Shelf South America Valdes Peninsula Mirounga leonina |
| spellingShingle |
Eddies (oceanic) Foraging behavior Mirounga leonina Oceanic fronts Telemetry Temporal distribution Bathymetry Coastal zones Eddy currents Ocean currents Seals Telemetering Eddies (oceanic) Foraging behavior Mirounga leonina Temporal distribution Seawater biotelemetry current direction diurnal variation diving behavior eddy foraging behavior hydrography juvenile movement oceanic front pinniped temperature gradient trajectory Argentina Argentine Basin Atlantic islands Atlantic Ocean Chubut Falkland Islands (Malvinas) Patagonian Shelf South America Valdes Peninsula Mirounga leonina Southern elephant seal trajectories, fronts and eddies in the Brazil/Malvinas Confluence |
| topic_facet |
Eddies (oceanic) Foraging behavior Mirounga leonina Oceanic fronts Telemetry Temporal distribution Bathymetry Coastal zones Eddy currents Ocean currents Seals Telemetering Eddies (oceanic) Foraging behavior Mirounga leonina Temporal distribution Seawater biotelemetry current direction diurnal variation diving behavior eddy foraging behavior hydrography juvenile movement oceanic front pinniped temperature gradient trajectory Argentina Argentine Basin Atlantic islands Atlantic Ocean Chubut Falkland Islands (Malvinas) Patagonian Shelf South America Valdes Peninsula Mirounga leonina |
| description |
This study describes the association between transient, mesoscale hydrographic features along the axis of the Brazil-Malvinas Confluence, in the SW Atlantic, and the foraging behavior of 2-3-year-old (focal) juvenile southern elephant seals, Mirounga leonina, from Península Valdés, Argentina. Departing from the dominant pattern of foraging on predictable bathymetric fronts on the Patagonian shelf and slope, three females out of 12 satellite-tracked juveniles remained at the edge of young warm-core eddies and near the outer core of cold-core eddies, coinciding with the most productive areas of these temperature fronts. Seal trajectories along high-temperature gradients were always consistent with the speed and direction of surface currents inferred from the temperature distribution and confirmed by surface drifters. Movements of foraging seals were compared with those of surface drifters, coinciding in time and space and yielding independent and consistent data on regional water circulation parameters. The diving pattern recorded for one focal seal yielded shallower dives and a loose diel pattern in the eddy, and a marked diurnal cycle compatible with foraging on vertically migrating prey in the cold waters of the Malvinas Current. Pre-reproductive females that use the mesoscale fronts of the Argentine Basin as an alternative foraging area would benefit from lower competition with more experienced seals and with other top predators that reproduce along the coast of Patagonia. © 2006 Elsevier Ltd. All rights reserved. |
| title |
Southern elephant seal trajectories, fronts and eddies in the Brazil/Malvinas Confluence |
| title_short |
Southern elephant seal trajectories, fronts and eddies in the Brazil/Malvinas Confluence |
| title_full |
Southern elephant seal trajectories, fronts and eddies in the Brazil/Malvinas Confluence |
| title_fullStr |
Southern elephant seal trajectories, fronts and eddies in the Brazil/Malvinas Confluence |
| title_full_unstemmed |
Southern elephant seal trajectories, fronts and eddies in the Brazil/Malvinas Confluence |
| title_sort |
southern elephant seal trajectories, fronts and eddies in the brazil/malvinas confluence |
| publishDate |
2006 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670637_v53_n12_p1907_Campagna http://hdl.handle.net/20.500.12110/paper_09670637_v53_n12_p1907_Campagna |
| _version_ |
1768542091346968576 |