Forces experienced by instrumented animals depend on lifestyle
Wilson, R. P.; Rose, K. A.; Gunner, R.; Holton, M.; Marks, N.; Bennett, N. C.; Bell, S.; Twining, J.; Hesketh, J.; Duarte, C. M.; Bezodis, N.; Scantlebury, M.
Show abstract
Animal-attached devices have transformed our understanding of vertebrate ecology. However, to be acceptable, researchers must minimize tag-related harm. The long-standing recommendation that tag masses should not exceed 3% of the animals body mass ignores tag forces generated by movement. We used collar-attached accelerometers on four free-ranging carnivores, spanning two orders of magnitude in mass, to reveal that during movement, forces exerted by 3% tags were generally equivalent to 4-19% of the animals masses, with a record of 54% in a hunting cheetah. Controlled studies on domestic dogs revealed how the tag forces are dictated by animal gait and speed but appear largely invariant of body mass. This fundamentally changes how acceptable tag mass limits should be determined, requiring cognizance of animal athleticism. One Sentence SummaryThere can be no universal rule for collar-tag masses as a percentage of carrier mass since tag forces depend on lifestyle.
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