Feeding Kinematics, Suction, and Hydraulic Jetting Performance of Harbor Seals (Phoca vitulina)
Abstract The feeding kinematics, suction and hydraulic jetting capabilities of captive harbor seals (Phoca vitulina) were characterized during controlled feeding trials. Feeding trials were conducted using a feeding apparatus that allowed a choice between biting and suction, but also presented food...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1077.483 2023-05-15T17:58:53+02:00 Feeding Kinematics, Suction, and Hydraulic Jetting Performance of Harbor Seals (Phoca vitulina) C D Marshall S Wieskotten W Hanke F D Hanke A Marsh The Pennsylvania State University CiteSeerX Archives 2014 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1077.483 http://www.tamug.edu/marshall/Pubs_repository/Marshall_et_al-2014.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1077.483 http://www.tamug.edu/marshall/Pubs_repository/Marshall_et_al-2014.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.tamug.edu/marshall/Pubs_repository/Marshall_et_al-2014.pdf text 2014 ftciteseerx 2020-05-03T00:16:25Z Abstract The feeding kinematics, suction and hydraulic jetting capabilities of captive harbor seals (Phoca vitulina) were characterized during controlled feeding trials. Feeding trials were conducted using a feeding apparatus that allowed a choice between biting and suction, but also presented food that could be ingested only by suction. Subambient pressure exerted during suction feeding behaviors was directly measured using pressure transducers. The mean feeding cycle duration for suctionfeeding events was significantly shorter (0.1560.09 s; P,0.01) than biting feeding events (0.1860.08 s). Subjects feeding inwater used both a suction and a biting feeding mode. Suction was the favored feeding mode (84% of all feeding events) compared to biting, but biting comprised 16% of feeding events. In addition, seals occasionally alternated suction with hydraulic jetting, or used hydraulic jetting independently, to remove fish from the apparatus. Suction and biting feeding modes were kinematically distinct regardless of feeding location (in-water vs. on-land). Suction was characterized by a significantly smaller gape (1.360.23 cm; P,0.001) and gape angle (12.962.02u), pursing of the rostral lips to form a circular aperture, and pursing of the lateral lips to occlude lateral gape. Biting was characterized by a large gape (3.6360.21 cm) and gape angle (28.861.80u; P,0.001) and lip curling to expose teeth. The maximum subambient pressure recorded was 48.8 kPa. In addition, harbor seals were able to jet water at food items using suprambient pressure, also known as hydraulic jetting. The maximum hydraulic jetting force recorded was 53.9 kPa. Suction and hydraulic jetting where employed 90.5% and 9.5%, respectively, during underwater feeding events. Harbor seals displayed a wide repertoire of behaviorally flexible feeding strategies to ingest fish from the feeding apparatus. Such flexibility of feeding strategies and biomechanics likely forms the basis of their opportunistic, generalized feeding ecology and concomitant breadth ... Text Phoca vitulina Unknown |
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description |
Abstract The feeding kinematics, suction and hydraulic jetting capabilities of captive harbor seals (Phoca vitulina) were characterized during controlled feeding trials. Feeding trials were conducted using a feeding apparatus that allowed a choice between biting and suction, but also presented food that could be ingested only by suction. Subambient pressure exerted during suction feeding behaviors was directly measured using pressure transducers. The mean feeding cycle duration for suctionfeeding events was significantly shorter (0.1560.09 s; P,0.01) than biting feeding events (0.1860.08 s). Subjects feeding inwater used both a suction and a biting feeding mode. Suction was the favored feeding mode (84% of all feeding events) compared to biting, but biting comprised 16% of feeding events. In addition, seals occasionally alternated suction with hydraulic jetting, or used hydraulic jetting independently, to remove fish from the apparatus. Suction and biting feeding modes were kinematically distinct regardless of feeding location (in-water vs. on-land). Suction was characterized by a significantly smaller gape (1.360.23 cm; P,0.001) and gape angle (12.962.02u), pursing of the rostral lips to form a circular aperture, and pursing of the lateral lips to occlude lateral gape. Biting was characterized by a large gape (3.6360.21 cm) and gape angle (28.861.80u; P,0.001) and lip curling to expose teeth. The maximum subambient pressure recorded was 48.8 kPa. In addition, harbor seals were able to jet water at food items using suprambient pressure, also known as hydraulic jetting. The maximum hydraulic jetting force recorded was 53.9 kPa. Suction and hydraulic jetting where employed 90.5% and 9.5%, respectively, during underwater feeding events. Harbor seals displayed a wide repertoire of behaviorally flexible feeding strategies to ingest fish from the feeding apparatus. Such flexibility of feeding strategies and biomechanics likely forms the basis of their opportunistic, generalized feeding ecology and concomitant breadth ... |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
C D Marshall S Wieskotten W Hanke F D Hanke A Marsh |
spellingShingle |
C D Marshall S Wieskotten W Hanke F D Hanke A Marsh Feeding Kinematics, Suction, and Hydraulic Jetting Performance of Harbor Seals (Phoca vitulina) |
author_facet |
C D Marshall S Wieskotten W Hanke F D Hanke A Marsh |
author_sort |
C D Marshall |
title |
Feeding Kinematics, Suction, and Hydraulic Jetting Performance of Harbor Seals (Phoca vitulina) |
title_short |
Feeding Kinematics, Suction, and Hydraulic Jetting Performance of Harbor Seals (Phoca vitulina) |
title_full |
Feeding Kinematics, Suction, and Hydraulic Jetting Performance of Harbor Seals (Phoca vitulina) |
title_fullStr |
Feeding Kinematics, Suction, and Hydraulic Jetting Performance of Harbor Seals (Phoca vitulina) |
title_full_unstemmed |
Feeding Kinematics, Suction, and Hydraulic Jetting Performance of Harbor Seals (Phoca vitulina) |
title_sort |
feeding kinematics, suction, and hydraulic jetting performance of harbor seals (phoca vitulina) |
publishDate |
2014 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1077.483 http://www.tamug.edu/marshall/Pubs_repository/Marshall_et_al-2014.pdf |
genre |
Phoca vitulina |
genre_facet |
Phoca vitulina |
op_source |
http://www.tamug.edu/marshall/Pubs_repository/Marshall_et_al-2014.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1077.483 http://www.tamug.edu/marshall/Pubs_repository/Marshall_et_al-2014.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766167612529573888 |