Jaws caught on the IMBL

dc.contributor.authorMaksimenko, Aen_AU
dc.contributor.authorReser, Den_AU
dc.contributor.authorHäusermann, Den_AU
dc.contributor.authorDe Veer, Men_AU
dc.contributor.authorPanagiotopoulou, Oen_AU
dc.contributor.authorHuveneers, Cen_AU
dc.contributor.authorWright, Den_AU
dc.contributor.authorHall, Cen_AU
dc.date.accessioned2024-02-21T03:11:45Zen_AU
dc.date.available2024-02-21T03:11:45Zen_AU
dc.date.issued2021-11-25en_AU
dc.date.statistics2023-04-24en_AU
dc.description.abstractMaturational changes in feeding behaviour among sharks are associated with increased mineralisation of the teeth and jaws, but this relationship has only been demonstrated in a few species. Large, highly mobile shark species are rarely available for detailed anatomical study, despite their importance for ecological health and widespread interest among the general population. We examined the crania, jaws, and teeth of two great white sharks (Carcharodon carcharias), a 2.3 m juvenile and a 3.2 m young adult. The CT scans used a 230 keV (mean energy) polychromatic beam from the 4 Tesla wiggler, with a filtration of 6mmAl, 6mmCu, 3mmMo and 3mmPb. The detector was a Teledyne-Dalsa Xineos 3030HR with 100µm pixels, a width of 300mm, and a 1mm CsI converter for high efficiency at high energy. Image noise was reduced by collecting 18,000 projections per rotation to deliver an image quality good enough to segment out different tissue types. With a beam size of 300mm x 35mm, the shark head was covered by ‘tiling’, and stitching the tiles, with the full-head image made up of two columns and 21 tiles, to image a 600mm x 520mm area. Total scan time was 9 hours. The heads were also imaged using conventional CT and 7 Tesla MRI for finite element modelling of bite forces produced by the jaw musculature. These results will be compared with measurements of the difference in mineralisation of tooth and jaw cartilage between the two specimens to assess developmental changes in tooth and jaw hardness as the animals shift their diets from largely fish-based (juvenile) to larger prey, such as seals, scavenged whales and surfers (adults). © The Authorsen_AU
dc.identifier.citationMaksimenko, A., Reser, D., Hausermann, D., De Veer, M., Panagiotopoulou, O., Huveneers, C., Wright, D., & Hall, C. (2021). Jaws caught on the IMBL. Presentation to the ANSTO User Meeting, 24-26 November 2021, Online. Retrieved from: https://events01.synchrotron.org.au/event/146/contributions/4264/en_AU
dc.identifier.conferenceenddate2021-11-26en_AU
dc.identifier.conferencenameANSTO User Meeting 2021en_AU
dc.identifier.conferenceplaceOnlineen_AU
dc.identifier.conferencestartdate2021-11-24en_AU
dc.identifier.urihttps://events01.synchrotron.org.au/event/146/contributions/4264/en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15374en_AU
dc.language.isoenen_AU
dc.publisherAustralian Nuclear Science and Technology Organisationen_AU
dc.subjectFishesen_AU
dc.subjectMineralizationen_AU
dc.subjectTeethen_AU
dc.subjectJawen_AU
dc.subjectAdultsen_AU
dc.subjectEcologyen_AU
dc.subjectImagesen_AU
dc.subjectBeamsen_AU
dc.titleJaws caught on the IMBLen_AU
dc.typeConference Presentationen_AU
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