Variation in morphology, gait characteristics and speed of locomotion in two populations of lizards
Variation in morphology, gait characteristics and speed of locomotion in two populations of lizards
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DOI：
10.1111/j.1095-8312.1998.tb01526.x
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发表时间：
1998-03
影响因子：
1.9
通讯作者：
R. Damme;P. Aerts;B. Vanhooydonck
中科院分区：
文献类型：
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作者：
R. Damme;P. Aerts;B. Vanhooydonck
运动行为在西班牙墙蜥蜴Podarcis hispanica的两个亚种之间存在差异。一个亚种生活在哥伦比亚群岛，另一个生活在西班牙大陆。大小标准化的自愿速度（在不受限制的实验室条件下测量）在岛屿人口中较低（P。atrata）比大陆种群（P. h.西班牙语）。最大运行性能（当追逐）是高得多的大陆人口比岛屿人口。高速录像记录表明，亚种的步态特征存在差异：大陆个体主要通过改变步长来调节跑步速度，岛屿个体主要通过改变步频来调节跑步速度。P. H. hispanica调节速度的策略可能使这个大陆亚种比岛屿亚种P. h. atrata理论上的考虑表明，在高速，P。西班牙人的跑步方式在能量上更有利，但这一假设有待实验验证。我们认为，亚种间运动效率的差异是由于大陆和岛屿之间捕食压力的差异造成的。大陆样地的捕食者多样性较高，蜥蜴的躲藏机会较少。
Locomotor behaviour varies between two subspecies of the Spanish wall lizard Podarcis hispanica. One subspecies inhabits the Columbretes islands, the other lives on the Spanish mainland. Size standardized voluntary speeds (as measured in unrestrained laboratory conditions) are lower in the island population (P. h. atrata) than in the mainland population (P. h. hispanica). Maximal running performance (when chased) is much higher in the mainland population than in the island population. High speed video recordings show that subspecies diVer in gait characteristics: individuals from the mainland modulate running velocity primarily by modifying stride length, individuals from the island primarily by altering stride frequency. P. h. hispanica’s strategy for modulating speed probably allows this mainland subspecies to attain higher maximal speeds than the island subspecies P. h. atrata. Theoretical considerations suggest that at high speeds, P. h. hispanica’s running style is energetically more favourable, but this hypothesis awaits experimental verification. We suggest that the diVerences in locomotion eYciency between the subspecies result from diVerences in predation pressure between the mainland and the island. The mainland study site has a higher predator diversity and oVers less hiding opportunities to the lizards.