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• W4321004787 abstract "The fossil record of pinnipeds documents a suite of morphological changes that facilitate their ecological transition from a terrestrial to an aquatic lifestyle. Among these is the loss of the tribosphenic molar and the behavior typically associated with it in mammals: mastication. Instead, modern pinnipeds exhibit a broad range of feeding strategies that facilitate their distinct aquatic ecologies. Here, we examine the feeding morphology of two species of pinnipeds with disparate feeding ecologies: Zalophus californianus, a specialized raptorial biter, and Mirounga angustirostris, a suction specialist. Specifically, we test whether the morphology of the lower jaws facilitates trophic plasticity in feeding for either of these species. We used finite element analysis (FEA) to simulate the stresses during the opening and closing of the lower jaws in these species to explore the mechanical limits of their feeding ecology. Our simulations demonstrate that both jaws are highly resistant to the tensile stresses experienced during feeding. The lower jaws of Z. californianus experienced the maximum stress at the articular condyle and the base of the coronoid process. The lower jaws of M. angustirostris experienced the maximum stress at the angular process and were more evenly distributed throughout the body of the mandible. Surprisingly, the lower jaws of M. angustirostris were even more resistant to the stresses experienced during feeding than those of Z. californianus. Thus, we conclude that the superlative trophic plasticity of Z. californianus is driven by other factors unrelated to the mandible's tensile resistance to stress during feeding." @default.
• W4321004787 created "2023-02-17" @default.
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• W4321004787 date "2023-02-16" @default.
• W4321004787 modified "2023-10-18" @default.
• W4321004787 title "Mechanical properties of the California sea lion (<i>Zalophus californianus</i>) and northern elephant seal (<i>Mirounga angustirostris</i>) lower jaws explain trophic plasticity" @default.
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• W4321004787 doi "https://doi.org/10.1002/ar.25180" @default.
• W4321004787 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36794994" @default.
• W4321004787 hasPublicationYear "2023" @default.
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