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Sagittal crest morphology decoupled from relative bite performance in Pleistocene tapirs(Perissodactyla:Tapiridae)

Integrative Zoology 2023年第2期18卷 254-277页

作者： Lisa VAN LINDEN Kim STOOPS Larissa C.C.S.DUMBÁ mario a.cozzuol Jamie A.MACLAREN Functional Morphology Lab Department of BiologyCampus Drie EikenUniversiteit AntwerpenAntwerpenBelgium Departamento de Zoologia Instituto de Ciências BiológicasUniversidade Federal de Minas GeraisMinas GeraisBrazil Evolution and Diversity Dynamics Lab Department of GeologyUniversitéde LiègeQuartier AgoraLiègeBelgium

Bite force is often associated with speciﬁc morphological features,such as sagittal *** presence of a pro-nounced sagittal crest in some tapirs(Perissodactyla:Tapiridae)was recently shown to be negatively correlated with hard-object feeding,in contrast with similar cranial structures in *** aim of this study was to investi-gate bite forces and sagittal crest heights across a wide range of modern and extinct tapirs and apply a comparative investigation to establish whether these features are correlated across a broad phylogenetic *** examined a sample of 71 specimens representing 15 tapir species(5 extant,10 extinct)using the dry-skull method,linear measurements of cranial features,phylogenetic reconstruction,and comparative *** were found to ex-hibit variation in bite force and sagittal crest height across their phylogeny and between different biogeographical realms,with high-crested morphologies occurring mostly in Neotropical *** highest bite forces within tapirs appear to be driven by estimates for the masseter–pterygoid muscle complex,rather than predicted forces for the temporalis *** results demonstrate that relative sagittal crest height is poorly correlated with relative cranial bite force,suggesting high force application is not a driver for pronounced sagittal crests in this *** divergent biomechanical capabilities of different contemporaneous tapirids may have allowed multiple species to occupy overlapping territories and partition resources to avoid excess *** forces in tapirs peak in Pleistocene species,independent of body size,suggesting possible dietary shifts as a potential result of climatic changes during this epoch.

关键词： biogeography dry-skull method herbivory mastication niche partitioning Pleistocene

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