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dc.contributor.authorAhnelt, Harald
dc.contributor.authorSauberer, Michael
dc.contributor.authorRamler, David
dc.contributor.authorKoch, Laura
dc.contributor.authorPogoreutz, Claudia
dc.identifier.citationAhnelt, H., Sauberer, M., Ramler, D., Koch, L., & Pogoreutz, C. (2019). Negative allometric growth during ontogeny in the large pelagic filter-feeding basking shark. Zoomorphology. doi:10.1007/s00435-019-00464-2
dc.description.abstractMany pelagic shark species change body and fin shape isometrically or by positive allometry during ontogeny. But some large apex predators such as the white shark Carcharodon carcharias or the tiger shark Galeocerdo cuvier show distinct negative allometry, especially in traits related to feeding (head) or propulsion (caudal fin). In particular, changes in propulsion are attributed to a shift in swimming mode. The more heterocercal caudal fin of younger individuals with its large caudal fin span seemingly aids in hunting small, agile prey. In contrast, the less heterocercal caudal fin with a larger fin area in larger individuals aids a long-distance slow swimming mode. We were interested if negative allometric effects can be observed in a planktivorous shark, the basking shark Cetorhinus maximus, a large species adapted to long-distance slow swimming. To address this question, we compared three size classes, specifically < 260 cm (juveniles), 299–490 cm (subadults), and from adults > 541 cm total length. Comparing literature data, we found negative allometric growth of the head and of the caudal fin, but a more rapid decrease of relative caudal fin size than of relative head length. Hereby, we provide the first evidence for early negative allometric growth of the caudal fin in a large pelagic filter-feeding shark. Our study further demonstrates that ecomorphological approaches may add valuable insight into the life history of animals that are challenging to study in their natural habitat, including large roving sharks such as the basking shark.
dc.description.sponsorshipOpen access funding provided by University of Vienna.
dc.publisherSpringer Nature
dc.rightsArchived with thanks to Zoomorphology
dc.titleNegative allometric growth during ontogeny in the large pelagic filter-feeding basking shark
dc.contributor.departmentRed Sea Research Center (RSRC)
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionDepartment of Theoretical Biology, University of Vienna, Althanstrasse 14, Vienna, 1090, Austria
dc.contributor.institutionFirst Zoological Department, Natural History Museum in Vienna, Burgring 7, Vienna, 1010, Austria
dc.contributor.institutionCenter for Health and Bioresources, Austrian Institute of Technology, Seibersdorf, Austria
dc.contributor.institutionDepartment of Limnology and Bio-Oceanography, University of Vienna, Althanstrasse 14, Vienna, 1090, Austria
kaust.personPogoreutz, Claudia

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