Ontogenetic change in skull morphology and mechanical advantage in the spotted hyena ( Crocuta crocuta )
dc.contributor.author | Tanner, Jaime B. | en_US |
dc.contributor.author | Zelditch, Miriam Leah | en_US |
dc.contributor.author | Lundrigan, Barbara L. | en_US |
dc.contributor.author | Holekamp, Kay E. | en_US |
dc.date.accessioned | 2010-03-01T20:22:20Z | |
dc.date.available | 2011-02-01T20:36:36Z | en_US |
dc.date.issued | 2010-03 | en_US |
dc.identifier.citation | Tanner, Jaime B.; Zelditch, Miriam L.; Lundrigan, Barbara L.; Holekamp, Kay E. (2010). "Ontogenetic change in skull morphology and mechanical advantage in the spotted hyena ( Crocuta crocuta )." Journal of Morphology 271(3): 353-365. <http://hdl.handle.net/2027.42/65047> | en_US |
dc.identifier.issn | 0362-2525 | en_US |
dc.identifier.issn | 1097-4687 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/65047 | |
dc.description.abstract | Weaning represents a challenging transition for young mammals, one particularly difficult for species coping with extreme conditions during feeding. Spotted hyenas ( Crocuta crocuta ) experience such extreme conditions imposed by intense feeding competition during which the ability to consume large quantities of food quickly is highly advantageous. As adult spotted hyenas have massive skulls specialized for durophagy and can feed very rapidly, young individuals are likely at a competitive disadvantage until that specialized morphology is completely developed. Here we document developmental changes in skull size, shape, and mechanical advantage of the jaws. Sampling an ontogenetic series of Crocuta skulls from individuals ranging in age from 2 months to 18 years, we use linear measurements and geometric morphometrics to test hypotheses suggesting that size, limited mechanical advantage of the jaws, and/or limited attachment sites for jaw muscles might constrain the feeding performance of juveniles. We also examine skull development in relation to key life history events, including weaning and reproductive maturity, to inquire whether ontogeny of the feeding apparatus is slower or more protracted in this species than in carnivores not specialized for durophagy. We find that, although mechanical advantage reaches maturity in hyenas at 22 months, adult skull size is not achieved until 29 months of age, and skull shape does not reach maturity until 35 months. The latter is nearly 2 years after mean weaning age, and more than 1 year after reproductive maturity. Thus, skull development in Crocuta is indeed protracted relative to that in most other carnivores. Based on the skull features that continue to change and to provide additional muscle attachment area, protracted development may be largely due to development of the massive musculature required by durophagy. These findings may ultimately shed light on the adaptive significance of the unusual “role-reversed” pattern of female dominance over males in this species. J. Morphol. 2010. © 2009 Wiley-Liss, Inc. | en_US |
dc.format.extent | 976644 bytes | |
dc.format.extent | 3118 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.publisher | Wiley Subscription Services, Inc., A Wiley Company | en_US |
dc.subject.other | Life and Medical Sciences | en_US |
dc.subject.other | Cell & Developmental Biology | en_US |
dc.title | Ontogenetic change in skull morphology and mechanical advantage in the spotted hyena ( Crocuta crocuta ) | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Molecular, Cellular and Developmental Biology | en_US |
dc.subject.hlbtoplevel | Health Sciences | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Museum of Paleontology, University of Michigan, Ann Arbor, Michigan 48109 | en_US |
dc.contributor.affiliationother | Department of Zoology, Michigan State University, East Lansing, Michigan 48824 ; Organismic and Evolutionary Biology Program, University of Massachusetts, Amherst, Massachusetts 01003 ; Darwin Fellow, Organismic and Evolutionary Biology Program, University of Massachusetts, 319 Morrill S, Amherst, MA 01003-9297 | en_US |
dc.contributor.affiliationother | Department of Zoology, Michigan State University, East Lansing, Michigan 48824 ; Michigan State University Museum, Michigan State University, East Lansing, Michigan 48824 | en_US |
dc.contributor.affiliationother | Department of Zoology, Michigan State University, East Lansing, Michigan 48824 ; Michigan State University Museum, Michigan State University, East Lansing, Michigan 48824 | en_US |
dc.identifier.pmid | 19862838 | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/65047/1/10802_ftp.pdf | |
dc.identifier.doi | 10.1002/jmor.10802 | en_US |
dc.identifier.source | Journal of Morphology | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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