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• W4376287797 abstract "Herbivores large and small need to mechanically process plant tissue. Their ability to do so is determined by two forces: the maximum force they can generate, and the minimum force required to fracture the plant tissue. The ratio of these forces determines the required relative mechanical effort; how this ratio varies with animal size is challenging to predict. We measured the forces required to cut thin polymer sheets with mandibles from leaf-cutter ant workers which vary by more than one order of magnitude in body mass. Cutting forces were independent of mandible size, but differed by a factor of two between pristine and worn mandibles. Mandibular wear is thus likely a more important determinant of cutting force than mandible size. We rationalise this finding with a biomechanical analysis which suggests that pristine mandibles are ideally ‘sharp’ – cutting forces are close to a theoretical minimum, which is independent of tool size and shape, and instead solely depends on the geometric and mechanical properties of the cut tissue. The increase of cutting force due to mandibular wear may be particularly problematic for small ants, which generate lower absolute bite forces, and thus require a larger fraction of their maximum bite force to cut the same plant." @default.
• W4376287797 created "2023-05-13" @default.
• W4376287797 creator A5001224188 @default.
• W4376287797 creator A5016178090 @default.
• W4376287797 creator A5018338020 @default.
• W4376287797 creator A5091931890 @default.
• W4376287797 date "2023-05-12" @default.
• W4376287797 modified "2023-10-17" @default.
• W4376287797 title "Biomechanics of cutting: sharpness, wear sensitivity, and the scaling of cutting forces in leaf-cutter ant mandibles" @default.
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