How do baleen whales stow their filter? A compoarative bioimechanical analysis of baleen bending

Bowhead and right whale (balaenid) baleen filtering plates, longer in vertical dimension (3-4+ m) than the closed mouth, presumably bend during gape closure. This has not been observed in live whales, even with scrutiny of videorecorded feeding sequences. To determine what happens to baleen as gape...

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Autores: Werth, Alexander J., Rita, Diego, Rosario, Michael V., Moore, Michael J., Sformo, Todd.L.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:España
Recursos:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/157657
Acesso em linha:https://hdl.handle.net/2445/157657
Access Level:acceso abierto
Palavra-chave:Balenes
Regulació de la respiració
Whales
Regulation of respiration
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spelling How do baleen whales stow their filter? A compoarative bioimechanical analysis of baleen bendingWerth, Alexander J.Rita, DiegoRosario, Michael V.Moore, Michael J.Sformo, Todd.L.BalenesRegulació de la respiracióWhalesRegulation of respirationBowhead and right whale (balaenid) baleen filtering plates, longer in vertical dimension (3-4+ m) than the closed mouth, presumably bend during gape closure. This has not been observed in live whales, even with scrutiny of videorecorded feeding sequences. To determine what happens to baleen as gape closes, we conducted an integrative, multifactorial study including materials testing, functional (flow tank and kinematic) testing, and histological examination. We measured baleen bending properties along the dorsoventral length of plates and anteroposterior location within a rack of plates via mechanical (axial bending, composite flexure, compression, and tension) tests of hydrated and air-dried tissue samples from balaenid and other whale baleen. Balaenid baleen is remarkably strong yet pliable, with ductile fringes and low stiffness and high elasticity when wet; it likely bends in the closed mouth when not used for filtration. Calculation of flexural modulus from stress/strain experiments shows baleen is slightly more flexible where it emerges from the gums and at its ventral terminus, but kinematic analysis indicates plates bend evenly along their whole length. Fin and humpback whale baleen has similar material properties but less flexibility, with no dorsoventral variation. Internal horn tubes have greater external and hollow luminal diameter but lower density in lateral relative to medial baleen of bowhead and fin whales, suggesting greater capacity for lateral bending. Baleen bending has major consequences not only for feeding morphology and energetics but also conservation given that entanglement in fishing gear is a leading cause of whale mortality.The Company of Biologists2018info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/157657Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1242/jeb.189233Journal of Experimental Biology, 2018, vol. 221, num. 23https://doi.org/10.1242/jeb.189233(c) The Company of Biologists, 2018info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1576572026-05-27T06:46:51Z
dc.title.none.fl_str_mv How do baleen whales stow their filter? A compoarative bioimechanical analysis of baleen bending
title How do baleen whales stow their filter? A compoarative bioimechanical analysis of baleen bending
spellingShingle How do baleen whales stow their filter? A compoarative bioimechanical analysis of baleen bending
Werth, Alexander J.
Balenes
Regulació de la respiració
Whales
Regulation of respiration
title_short How do baleen whales stow their filter? A compoarative bioimechanical analysis of baleen bending
title_full How do baleen whales stow their filter? A compoarative bioimechanical analysis of baleen bending
title_fullStr How do baleen whales stow their filter? A compoarative bioimechanical analysis of baleen bending
title_full_unstemmed How do baleen whales stow their filter? A compoarative bioimechanical analysis of baleen bending
title_sort How do baleen whales stow their filter? A compoarative bioimechanical analysis of baleen bending
dc.creator.none.fl_str_mv Werth, Alexander J.
Rita, Diego
Rosario, Michael V.
Moore, Michael J.
Sformo, Todd.L.
author Werth, Alexander J.
author_facet Werth, Alexander J.
Rita, Diego
Rosario, Michael V.
Moore, Michael J.
Sformo, Todd.L.
author_role author
author2 Rita, Diego
Rosario, Michael V.
Moore, Michael J.
Sformo, Todd.L.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Balenes
Regulació de la respiració
Whales
Regulation of respiration
topic Balenes
Regulació de la respiració
Whales
Regulation of respiration
description Bowhead and right whale (balaenid) baleen filtering plates, longer in vertical dimension (3-4+ m) than the closed mouth, presumably bend during gape closure. This has not been observed in live whales, even with scrutiny of videorecorded feeding sequences. To determine what happens to baleen as gape closes, we conducted an integrative, multifactorial study including materials testing, functional (flow tank and kinematic) testing, and histological examination. We measured baleen bending properties along the dorsoventral length of plates and anteroposterior location within a rack of plates via mechanical (axial bending, composite flexure, compression, and tension) tests of hydrated and air-dried tissue samples from balaenid and other whale baleen. Balaenid baleen is remarkably strong yet pliable, with ductile fringes and low stiffness and high elasticity when wet; it likely bends in the closed mouth when not used for filtration. Calculation of flexural modulus from stress/strain experiments shows baleen is slightly more flexible where it emerges from the gums and at its ventral terminus, but kinematic analysis indicates plates bend evenly along their whole length. Fin and humpback whale baleen has similar material properties but less flexibility, with no dorsoventral variation. Internal horn tubes have greater external and hollow luminal diameter but lower density in lateral relative to medial baleen of bowhead and fin whales, suggesting greater capacity for lateral bending. Baleen bending has major consequences not only for feeding morphology and energetics but also conservation given that entanglement in fishing gear is a leading cause of whale mortality.
publishDate 2018
dc.date.none.fl_str_mv 2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/157657
url https://hdl.handle.net/2445/157657
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1242/jeb.189233
Journal of Experimental Biology, 2018, vol. 221, num. 23
https://doi.org/10.1242/jeb.189233
dc.rights.none.fl_str_mv (c) The Company of Biologists, 2018
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The Company of Biologists, 2018
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv The Company of Biologists
publisher.none.fl_str_mv The Company of Biologists
dc.source.none.fl_str_mv Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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