Hancock Thomas V, Hedrick Michael S
Department of Biology, Portland State University, Portland, OR 97201, USA.
Department of Biological Sciences, California State University, East Bay, Hayward, CA 94542, USA.
Comp Biochem Physiol A Mol Integr Physiol. 2018 Sep;223:42-51. doi: 10.1016/j.cbpa.2018.05.015. Epub 2018 May 18.
Vagility is defined as the relative capacity for movement. We developed previously a quantitative metric in vertebrates for physiological vagility (PV), the speed at which an animal can move sustainably, incorporating aerobic capacity, body size, body temperature, and transport costs, allowing quantitative tests of whether PV can explain variation in interclass population genetic structure and behaviors involved in dispersal. We found that PV increased with body mass, correlated with maximal dispersal distances, and was inversely related to genetic structure in multiple vertebrate groups. Here we review these relationships and expand our analysis to include additional groups; we also suggest that PV may be utilized to partially explain variation in migratory capacity between groups. We show a positive correlation between PV and maximum migration distance (M) in most groups that reflects many of the relationships observed between PV and dispersal. Flying birds, marine mammals, and large terrestrial mammals display the greatest M and each of these groups has the highest PV among vertebrate groups, while reptiles and small terrestrial mammals had the lowest PV and M. By contrast, marine turtles have exceptional M but do not possess high PV. We suggest that PV is an important mechanism enabling both dispersal and migratory capacity, and affects genetic structure, but that other life history characteristics also need to be considered.
机动性被定义为相对运动能力。我们之前为脊椎动物开发了一种用于生理机动性（PV）的定量指标，即动物能够持续移动的速度，该指标纳入了有氧能力、体型、体温和运输成本，从而能够对PV是否可以解释不同类群间种群遗传结构的差异以及与扩散相关的行为进行定量测试。我们发现，PV随体重增加，与最大扩散距离相关，并且在多个脊椎动物类群中与遗传结构呈负相关。在此，我们回顾这些关系并扩展我们的分析以纳入更多类群；我们还提出，PV可用于部分解释不同类群间迁徙能力的差异。我们表明，在大多数类群中，PV与最大迁徙距离（M）呈正相关，这反映了在PV与扩散之间观察到的许多关系。飞鸟、海洋哺乳动物和大型陆地哺乳动物表现出最大的M，并且在脊椎动物类群中，这些类群各自具有最高的PV，而爬行动物和小型陆地哺乳动物的PV和M最低。相比之下，海龟具有非凡的M，但不具备高PV。我们认为，PV是一种重要机制，既能实现扩散又能具备迁徙能力，并影响遗传结构，但还需要考虑其他生活史特征。
