Buoyed up and slowed down: Speed limits for diving birds in shallow water
In air-breathing animals, the time and energy costs of each dive are primarily determined by depth-related upthrust, swim speed and temperature. While studies have previously investigated how animals should optimise their behaviour in relation to either upthrust or speed they have rarely been examin...
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ftconicet:oai:ri.conicet.gov.ar:11336/63163 2023-10-09T21:55:15+02:00 Buoyed up and slowed down: Speed limits for diving birds in shallow water Shepard, Emily L. C. Wilson, Rory P. Gómez Laich, Agustina Marta Quintana, Flavio Roberto application/pdf http://hdl.handle.net/11336/63163 eng eng Inter-Research info:eu-repo/semantics/altIdentifier/doi/10.3354/ab00232 http://hdl.handle.net/11336/63163 Shepard, Emily L. C.; Wilson, Rory P.; Gómez Laich, Agustina Marta; Quintana, Flavio Roberto; Buoyed up and slowed down: Speed limits for diving birds in shallow water; Inter-Research; Aquatic Biology; 8; 3; 3-2010; 259-267 1864-7782 1864-7790 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ ACCELEROMETRY DIVING BIRD ODBA OVERALL DYNAMIC BODY ACCELERATION SWIM SPEED https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.3354/ab00232 2023-09-24T20:01:53Z In air-breathing animals, the time and energy costs of each dive are primarily determined by depth-related upthrust, swim speed and temperature. While studies have previously investigated how animals should optimise their behaviour in relation to either upthrust or speed they have rarely been examined in tandem. We took overall dynamic body acceleration (ODBA) as a proxy for the mechanical power used during the bottom phases of dives of imperial shags Phalacrocorax atriceps, as these birds forage benthically, in order to define: (1) the minimum power required for swimming at depth and (2) how the use of power above this threshold varied with dive depth. Results showed that ODBA declined with increasing dive depth in a manner correlated with the reduction in upthrust, and that the use of power above that required for prey searching increased with increasing dive depth. This may constitute a response to depth-related patterns in prey availability. We present a model to investigate an alternative hypothesis that the ability of birds to produce burst speeds is also inversely related to the power required to counter buoyancy. Under the model assumptions, achievable burst speeds vary up to 0.7 m s–1 across dive depths from 5 to 60 m. Ultimately, prey preferences cannot be separated from prey fields, but we suggest that this model may provide insight into the ability of air-breathing divers to pursue various prey types according to dive depth. Fil: Shepard, Emily L. C. Swansea University; Reino Unido Fil: Wilson, Rory P. Swansea University; Reino Unido Fil: Gómez Laich, Agustina Marta. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina Fil: Quintana, Flavio Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Wildlife Conservation Society; Estados Unidos Article in Journal/Newspaper Phalacrocorax atriceps CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Argentina Aquatic Biology 8 259 267 |
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Open Polar |
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CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
ACCELEROMETRY DIVING BIRD ODBA OVERALL DYNAMIC BODY ACCELERATION SWIM SPEED https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
ACCELEROMETRY DIVING BIRD ODBA OVERALL DYNAMIC BODY ACCELERATION SWIM SPEED https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 Shepard, Emily L. C. Wilson, Rory P. Gómez Laich, Agustina Marta Quintana, Flavio Roberto Buoyed up and slowed down: Speed limits for diving birds in shallow water |
topic_facet |
ACCELEROMETRY DIVING BIRD ODBA OVERALL DYNAMIC BODY ACCELERATION SWIM SPEED https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
description |
In air-breathing animals, the time and energy costs of each dive are primarily determined by depth-related upthrust, swim speed and temperature. While studies have previously investigated how animals should optimise their behaviour in relation to either upthrust or speed they have rarely been examined in tandem. We took overall dynamic body acceleration (ODBA) as a proxy for the mechanical power used during the bottom phases of dives of imperial shags Phalacrocorax atriceps, as these birds forage benthically, in order to define: (1) the minimum power required for swimming at depth and (2) how the use of power above this threshold varied with dive depth. Results showed that ODBA declined with increasing dive depth in a manner correlated with the reduction in upthrust, and that the use of power above that required for prey searching increased with increasing dive depth. This may constitute a response to depth-related patterns in prey availability. We present a model to investigate an alternative hypothesis that the ability of birds to produce burst speeds is also inversely related to the power required to counter buoyancy. Under the model assumptions, achievable burst speeds vary up to 0.7 m s–1 across dive depths from 5 to 60 m. Ultimately, prey preferences cannot be separated from prey fields, but we suggest that this model may provide insight into the ability of air-breathing divers to pursue various prey types according to dive depth. Fil: Shepard, Emily L. C. Swansea University; Reino Unido Fil: Wilson, Rory P. Swansea University; Reino Unido Fil: Gómez Laich, Agustina Marta. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina Fil: Quintana, Flavio Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Wildlife Conservation Society; Estados Unidos |
format |
Article in Journal/Newspaper |
author |
Shepard, Emily L. C. Wilson, Rory P. Gómez Laich, Agustina Marta Quintana, Flavio Roberto |
author_facet |
Shepard, Emily L. C. Wilson, Rory P. Gómez Laich, Agustina Marta Quintana, Flavio Roberto |
author_sort |
Shepard, Emily L. C. |
title |
Buoyed up and slowed down: Speed limits for diving birds in shallow water |
title_short |
Buoyed up and slowed down: Speed limits for diving birds in shallow water |
title_full |
Buoyed up and slowed down: Speed limits for diving birds in shallow water |
title_fullStr |
Buoyed up and slowed down: Speed limits for diving birds in shallow water |
title_full_unstemmed |
Buoyed up and slowed down: Speed limits for diving birds in shallow water |
title_sort |
buoyed up and slowed down: speed limits for diving birds in shallow water |
publisher |
Inter-Research |
url |
http://hdl.handle.net/11336/63163 |
geographic |
Argentina |
geographic_facet |
Argentina |
genre |
Phalacrocorax atriceps |
genre_facet |
Phalacrocorax atriceps |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3354/ab00232 http://hdl.handle.net/11336/63163 Shepard, Emily L. C.; Wilson, Rory P.; Gómez Laich, Agustina Marta; Quintana, Flavio Roberto; Buoyed up and slowed down: Speed limits for diving birds in shallow water; Inter-Research; Aquatic Biology; 8; 3; 3-2010; 259-267 1864-7782 1864-7790 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.3354/ab00232 |
container_title |
Aquatic Biology |
container_volume |
8 |
container_start_page |
259 |
op_container_end_page |
267 |
_version_ |
1779319107890446336 |