Zoeken
Zoeken kan via de modus 'eenvoudig zoeken' (één veld) of uitgebreid via 'geavanceerd zoeken' (meerdere velden). Zo kan je bv. zoeken op een combinatie van een auteursnaam (auteur), een jaartal (jaar) en een documenttype.
Boekenmand
Nuttige resultaten kan je aanvinken en toevoegen aan een mandje. De inhoud hiervan kan je exporteren of afdrukken (naar bv. PDF).
RSS
Op de hoogte blijven van nieuw toegevoegde publicaties binnen uw interessegebied? Dit kan door een RSS-feed (?) te maken van jouw zoekopdracht.
nieuwe zoekopdracht
Rostral densification in beaked whales: Diverse processes for a similar pattern
Lambert, O.; de Buffrenil, V.; De Muizon, C. (2011). Rostral densification in beaked whales: Diverse processes for a similar pattern. C. R., Palévol 10(5-6): 453-468. dx.doi.org/10.1016/j.crpv.2011.03.012
In: Comptes Rendus. Palévol. Elsevier: Paris. ISSN 1631-0683; e-ISSN 1777-571X
|  |
| Trefwoorden |
Cetacea [WoRMS]; Odontoceti Flower, 1867 [WoRMS]; Ziphiidae Gray, 1850 [WoRMS]
Marien/Kust |
| Author keywords |
Odontoceti; Ziphiidae; Beaked whales; Pachyostosis; Osteosclerosis;Computed tomography; Bone histology |
| Auteurs | | Top |
- Lambert, O.
- de Buffrenil, V.
- De Muizon, C.
|
|
|
| Abstract |
As compared to other odontocetes (toothed whales), the rostrum of beaked whales (family Ziphiidae) often displays extensive changes in the shape, thickness, and density of its constituent bones. Previous morphological observations suggested that these modifications appeared in parallel in different ziphiid lineages. However, very few data were available on the compactness and histology of these rostral bones, which precluded the study of the processes at work for the development of such structures, as well as the interpretation of their functional implications. In this work we review the bibliographic data on the anatomy of the ziphiid rostrum and we add new observations on adults of several extinct and extant taxa. These observations are based on CT scans and transverse histological sections. Our results confirm that different bones (vomer, mesethmoid, premaxilla, maxilla) are involved in the various morphologies displayed by ziphiid rostra. Strong density contrasts are detected between bones and/or inside the bones themselves; for example, parts of the rostrum reach densities in the range of Neoceti ear bones, which are among the densest bones known hitherto. Furthermore, the histology of the pachyostotic and osteosclerotic bones proves to change from one taxon to the other; the degree of Haversian remodeling varies strongly between species: it can be absent (e.g. Aporotus recurvirostris), partial (e.g. aff. Ziphirostrum), or complete (e.g., Mesoplodon densirostris). The atypical secondary osteons known to be responsible for bone hypermineralization in the rostrum of M. densirostris occurred also in Choneziphius sp. Confronted with a phylogenetic framework, these anatomical and histological observations indicate that the acquisition of compact (osteosclerotic) and/or swollen (pachyostotic) bone is the result of a broad convergence between taxa, in response to common selective pressures. The functional dimension of this question is discussed with respect to what is known about extant ziphiid ecology. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
