Ontogenetic study of the mechanical properties and architecture of the radius (appendicular bone) of two species of odontocetes Stenella coeruleoalba and Pontoporia blainvillei = Estudio ontogenético de las propiedades mecánicas y la arquitectura en el radio (hueso apendicular) de dos especies de odontocetos Stenella coeruleoalba y Pontoporia blainvillei

dc.contributor
Universitat de Barcelona. Departament de Biologia Animal
dc.contributor.author
Alba Fernández, Carmiña
dc.date.accessioned
2016-06-29T06:58:07Z
dc.date.available
2017-02-08T06:45:14Z
dc.date.issued
2016-02-08
dc.identifier.uri
http://hdl.handle.net/10803/386444
dc.description.abstract
This work is the result of extensive research on sexual and ontogenetic variation of parameters with mechanical significance in a radius bone in two species of odontocetes: Stenella coeruleoalba (Sc) and Pontoporia Blainvillei (Pb) (Cetacea, Mammalia). Our assumption was that the proportions of the bone structures were not only limited by the constraints of mechanical nature, but also by factors of adaptive type, including those arising from the selective pressure of possible modes of transport. In Cetacean, it has been reported that the size and shape of the pectoral limbs are related to the ecology of each species. Allometric scaling relationship of the bones of the fins in response to the ecological requirements has also been reported. Our results show negative allometric patterns in the radius of Sc, as in other oceanic dolphins and conversely, positive allometric patterns in Pb. These biomechanical differences in radius in both species might be due to an adaptation to the respective means (oceanic vs. estuarine). Gender differences in Sc are associated to the corresponding effort made males and females according to their complex social structure, in which males have greater physical activity than females. In Sc, the mechanical parameters grow more and faster in females than in males, reaching peak faster. It may be due to a compensation of loss of bone mass relative to males, caused by hormonal changes and lactation. Pb growth is slower and no such compensation is observed. Pb has a hypermineralized bone compared to what normal mineral content is considered, among which is Sc. As a result, their bones offer less resistance against transverse forces. The Ca / P ratio found for both species is greater in sexually mature animals than in other vertebrates and is similar to those cases where the bone has undergone a metabolic diseases This result suggests a non-pathological secondary osteoporosis in these dolphins, which agrees with the already describe Delphinus delphis. Bone microarchitecture is a spatial and temporal function. From the spatial point of view, according to the results of microhardness and nanohardness, bone is harder from the center outward. From the point of view of time, the average hardness of the bone (microhardness) changes with age, increasing in the whole bone in Sc and in the cortical bone in Pb whereas it decreases in the trabecular Pb bone. This observation, along with the fact that the bone is denser, would lead to a bone with more strength.
eng
dc.format.extent
212 p.
dc.format.mimetype
application/pdf
dc.language.iso
eng
dc.publisher
Universitat de Barcelona
dc.rights.license
L'accés als continguts d'aquesta tesi queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons: http://creativecommons.org/licenses/by/3.0/es/
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/es/
*
dc.source
TDX (Tesis Doctorals en Xarxa)
dc.subject
Locomoció animal
dc.subject
Locomoción animal
dc.subject
Animal locomotion
dc.subject
Radi (Os)
dc.subject
Radio (Hueso)
dc.subject
Radius (Anatomy)
dc.subject
Cetacis
dc.subject
Cetáceos
dc.subject
Cetacea
dc.subject.other
Ciències Experimentals i Matemàtiques
dc.title
Ontogenetic study of the mechanical properties and architecture of the radius (appendicular bone) of two species of odontocetes Stenella coeruleoalba and Pontoporia blainvillei = Estudio ontogenético de las propiedades mecánicas y la arquitectura en el radio (hueso apendicular) de dos especies de odontocetos Stenella coeruleoalba y Pontoporia blainvillei
dc.type
info:eu-repo/semantics/doctoralThesis
dc.type
info:eu-repo/semantics/publishedVersion
dc.subject.udc
59
cat
dc.contributor.director
Casinos, A.
dc.contributor.director
Aguilar, Àlex
dc.contributor.tutor
Casinos, A.
dc.embargo.terms
12 mesos
dc.rights.accessLevel
info:eu-repo/semantics/openAccess


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