期刊
JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMS AND ENVIRONMENTAL PHYSIOLOGY
卷 193, 期 2, 页码 145-153出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00360-022-01471-4
关键词
LaMSA; Pitch; Invertebrate; Energy budget; Jumping; Biomechanics
In this study, the researchers observed the angular velocity of locusts during take-off and found that it scales with mass, suggesting a constant rotational kinetic energy density. They also found that angular velocity increases proportionally with linear velocity, indicating a fixed energy budget at take-off. On average, only 1.3% of the energy budget is devoted to rotational kinetic energy, which is consistent across all sizes of locusts. This suggests that smaller locusts have a harder time jumping without body rotation.
Locusts (Schistocerca gregaria) jump using a latch mediated spring actuated system in the femur-tibia joint of their metathoracic legs. These jumps are exceptionally fast and display angular rotation immediately after take-off. In this study, we focus on the angular velocity, at take-off, of locusts ranging between 0.049 and 1.50 g to determine if and how rotation-rate scales with size. From 263 jumps recorded from 44 individuals, we found that angular velocity scales with mass(-0.33), consistent with a hypothesis of locusts having a constant rotational kinetic energy density. Within the data from each locust, angular velocity increased proportionally with linear velocity, suggesting the two cannot be independently controlled and thus a fixed energy budget is formed at take-off. On average, the energy budget of a jump is distributed 98.7% to translational kinetic energy and gravitational potential energy, and 1.3% to rotational kinetic energy. The percentage of energy devoted to rotation was constant across all sizes of locusts and represents a very small proportion of the energy budget. This analysis suggests that smaller locusts find it harder to jump without body rotation.
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