Short time-scale wind forced variability in the Río de la Plata Estuary and its role on ichthyoplankton retention

The Río de la Plata Estuary presents a strong bottom salinity front located over a submerged shoal. Apparently favored by retention processes, it is a spawning ground for several coastal fishes. This estuary is very shallow and essentially wind driven and, moreover, in time scales relevant to biota,...

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Autores principales: Simionato, C.G., Berasategui, A., Meccia, V.L., Acha, M., Mianzan, H.
Formato: JOUR
Materias:
60-54° W and 34-37° S
bathymetric control
numerical model
retention processes
Río de la Plata Estuary
wind variability
bathymetry
estuarine environment
ichthyoplankton
retention
spawning ground
timescale
wind forcing
Rio de la Plata
South America
Pisces
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02727714_v76_n2_p211_Simionato
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_02727714_v76_n2_p211_Simionato
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spelling todo:paper_02727714_v76_n2_p211_Simionato2023-10-03T15:15:22Z Short time-scale wind forced variability in the Río de la Plata Estuary and its role on ichthyoplankton retention Simionato, C.G. Berasategui, A. Meccia, V.L. Acha, M. Mianzan, H. 60-54° W and 34-37° S bathymetric control numerical model retention processes Río de la Plata Estuary wind variability bathymetry estuarine environment ichthyoplankton numerical model retention spawning ground timescale wind forcing Rio de la Plata South America Pisces The Río de la Plata Estuary presents a strong bottom salinity front located over a submerged shoal. Apparently favored by retention processes, it is a spawning ground for several coastal fishes. This estuary is very shallow and essentially wind driven and, moreover, in time scales relevant to biota, estuarine circulation is wind dominated and highly variable. Two intriguing questions are, therefore, how this system can favor retention and what the involved mechanisms are. This paper qualitatively explores mechanisms involved in the estuary where retention is favored applying numerical simulations in which neutral particles - simulating fish eggs and early larvae - are released along the bottom frontal zone and tracked for different wind conditions. Results suggest that retentive features can be a consequence of estuarine response to natural wind variability acting over bathymetric features. For winds from most directions, particles either remain trapped near their launching position or move northeastward to southwestward along the shoal. As alternation of winds that favor along-shoal motion is the dominant feature of wind variability in the region, a retentive scenario results from prevailing wind variability. Additionally, winds that tend to export particles with a poor chance of being restored to the front are neither frequent nor persistent. Results show, therefore, that physical forcing alone might generate a retentive scenario at the inner part of this estuary. The physical retention mechanism is more effective for bottom than for surface launched particles. Wind statistics indicate that the proposed mechanism has different implications for retention along the seasons. Spring is the most favorable season, followed by summer, when particles would have a larger propensity to reach the southern area of the estuary (Samborombón Bay). Fall and winter are increasingly less favorable. All these features are consistent with patterns observed in the region in organisms having different life history traits. © 2007 Elsevier Ltd. All rights reserved. Fil:Simionato, C.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Meccia, V.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02727714_v76_n2_p211_Simionato
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 60-54° W and 34-37° S
bathymetric control
numerical model
retention processes
Río de la Plata Estuary
wind variability
bathymetry
estuarine environment
ichthyoplankton
numerical model
retention
spawning ground
timescale
wind forcing
Rio de la Plata
South America
Pisces
spellingShingle 60-54° W and 34-37° S
bathymetric control
numerical model
retention processes
Río de la Plata Estuary
wind variability
bathymetry
estuarine environment
ichthyoplankton
numerical model
retention
spawning ground
timescale
wind forcing
Rio de la Plata
South America
Pisces
Simionato, C.G.
Berasategui, A.
Meccia, V.L.
Acha, M.
Mianzan, H.
Short time-scale wind forced variability in the Río de la Plata Estuary and its role on ichthyoplankton retention
topic_facet 60-54° W and 34-37° S
bathymetric control
numerical model
retention processes
Río de la Plata Estuary
wind variability
bathymetry
estuarine environment
ichthyoplankton
numerical model
retention
spawning ground
timescale
wind forcing
Rio de la Plata
South America
Pisces
description The Río de la Plata Estuary presents a strong bottom salinity front located over a submerged shoal. Apparently favored by retention processes, it is a spawning ground for several coastal fishes. This estuary is very shallow and essentially wind driven and, moreover, in time scales relevant to biota, estuarine circulation is wind dominated and highly variable. Two intriguing questions are, therefore, how this system can favor retention and what the involved mechanisms are. This paper qualitatively explores mechanisms involved in the estuary where retention is favored applying numerical simulations in which neutral particles - simulating fish eggs and early larvae - are released along the bottom frontal zone and tracked for different wind conditions. Results suggest that retentive features can be a consequence of estuarine response to natural wind variability acting over bathymetric features. For winds from most directions, particles either remain trapped near their launching position or move northeastward to southwestward along the shoal. As alternation of winds that favor along-shoal motion is the dominant feature of wind variability in the region, a retentive scenario results from prevailing wind variability. Additionally, winds that tend to export particles with a poor chance of being restored to the front are neither frequent nor persistent. Results show, therefore, that physical forcing alone might generate a retentive scenario at the inner part of this estuary. The physical retention mechanism is more effective for bottom than for surface launched particles. Wind statistics indicate that the proposed mechanism has different implications for retention along the seasons. Spring is the most favorable season, followed by summer, when particles would have a larger propensity to reach the southern area of the estuary (Samborombón Bay). Fall and winter are increasingly less favorable. All these features are consistent with patterns observed in the region in organisms having different life history traits. © 2007 Elsevier Ltd. All rights reserved.
format JOUR
author Simionato, C.G.
Berasategui, A.
Meccia, V.L.
Acha, M.
Mianzan, H.
author_facet Simionato, C.G.
Berasategui, A.
Meccia, V.L.
Acha, M.
Mianzan, H.
author_sort Simionato, C.G.
title Short time-scale wind forced variability in the Río de la Plata Estuary and its role on ichthyoplankton retention
title_short Short time-scale wind forced variability in the Río de la Plata Estuary and its role on ichthyoplankton retention
title_full Short time-scale wind forced variability in the Río de la Plata Estuary and its role on ichthyoplankton retention
title_fullStr Short time-scale wind forced variability in the Río de la Plata Estuary and its role on ichthyoplankton retention
title_full_unstemmed Short time-scale wind forced variability in the Río de la Plata Estuary and its role on ichthyoplankton retention
title_sort short time-scale wind forced variability in the río de la plata estuary and its role on ichthyoplankton retention
url http://hdl.handle.net/20.500.12110/paper_02727714_v76_n2_p211_Simionato
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AT berasateguia shorttimescalewindforcedvariabilityintheriodelaplataestuaryanditsroleonichthyoplanktonretention
AT mecciavl shorttimescalewindforcedvariabilityintheriodelaplataestuaryanditsroleonichthyoplanktonretention
AT acham shorttimescalewindforcedvariabilityintheriodelaplataestuaryanditsroleonichthyoplanktonretention
AT mianzanh shorttimescalewindforcedvariabilityintheriodelaplataestuaryanditsroleonichthyoplanktonretention
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