期刊
JOURNAL OF COMPARATIVE PHYSIOLOGY A-NEUROETHOLOGY SENSORY NEURAL AND BEHAVIORAL PHYSIOLOGY
卷 207, 期 2, 页码 257-268出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00359-020-01455-1
关键词
Autotomy; Locomotion energetics; Opiliones; Respirometry
资金
- 2018 program Student Mentoring and Research Teams (SMART) from UC Berkeley's Graduate Division
- Margaret C. Walker Fund for teaching and research in systematic entomology from the Essig Museum of Entomology at UC Berkeley
- National Science Foundation [IOS-1556421]
The study showed that endurance gradually decreased with the increasing number of lost legs, while oxygen consumption only increased for harvestmen that lost three legs. These findings suggest that individuals can lose a certain number of legs before experiencing measurable energetic consequences, with implications for ecology and evolution.
Animal movements are highly constrained by morphology and energetics. In addition, predictable bodily damage can constrain locomotion even further. For example, for animals moving on land, losing legs may impose additional costs. We tested if losing legs affects the distance travelled over time (endurance) and the metabolic costs of locomotion (oxygen consumption) in Nelima paessleri harvestmen. These arachnids voluntary releases legs (i.e., autotomy) in response to predation attempts. We used flow-through respirometry as animals moved on a treadmill inside a sealed chamber. We found that endurance decreased gradually with an increasing number of legs lost. Interestingly, oxygen consumption increased only for harvestmen that lost three legs, but not for individuals that lost only a single leg. These results have different ecological and evolutionary implications. Reduced endurance may impair an animal's ability to continue moving away from potential predators, while increased oxygen consumption makes movement costlier. Our findings suggest that individuals have a threshold number of legs that can be lost before experiencing measurable energetic consequences. Overall, our findings illustrate how animals respond to morphological modifications (i.e., damage) that affect the physiology of locomotion.
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