New born hatchlings of Calotes versicolor were reared in terrarium having narrow or wide perches for a period of 4-month and their snout vent length（SVL）, tail, fore and hindlimb lengths were measured at monthly int...New born hatchlings of Calotes versicolor were reared in terrarium having narrow or wide perches for a period of 4-month and their snout vent length（SVL）, tail, fore and hindlimb lengths were measured at monthly intervals. Limb postures（closer to the body or spread away from the body） were also recorded. The sprint speed was recorded in two and four-month old lizards on a 1 m long race track providing 45° or 60° slope. In both the groups, SVL and tail lengths were comparable but the limb lengths and their growth rates were significantly greater in lizards of wider perch group. The lizards reared with narrow perches positioned their limbs closer to the body; while those reared on wider perches spread their limbs away from their body. Further, the latter exhibited significantly higher sprint speed regardless of the slope of the race track over those of narrow perch group. Sprint speeds of lizards in both groups were correlated with the limb sizes. The study showed that the lizards reared on narrow or wide perches exhibited divergent adaptive responses（phenotypic plasticity） by developing longer or shorter limbs and corresponding changes in their sprint speeds. These findings support the idea that availability of perch structure during early development evokes adaptive plasticity in the limb development and associated locomotory performance in arboreal lizards like C. versicolor.展开更多
动物在野外生境中的活动能力通常会受到许多方面(例如,运动基质表面粗糙程度、遭遇障碍物的大小与形状)的影响。在特定体温(30℃)条件下,测量主要分布区重叠的两蜥蜴种类(北草蜥和中国石龙子)在四种不同基质表面(塑料草坪;表面粗糙不透...动物在野外生境中的活动能力通常会受到许多方面(例如,运动基质表面粗糙程度、遭遇障碍物的大小与形状)的影响。在特定体温(30℃)条件下,测量主要分布区重叠的两蜥蜴种类(北草蜥和中国石龙子)在四种不同基质表面(塑料草坪;表面粗糙不透底的塑料地毯;光滑具透底网格的塑料地毯和表面光滑的塑料地毯)的运动表现,以及两者的攀附能力和最大游泳耐力。基质类型显著影响两种蜥蜴的运动表现。两种蜥蜴在粗糙表面运动时的疾跑速明显大于光滑表面(例如,塑料草坪上北草蜥为15.7 SVL/s,中国石龙子为8.1 SVL/s;光滑塑料地毯上则分别为11.4 SVL/s和3.5 SVL/s)。中国石龙子在光滑塑料地毯上具有最大的持续运动距离(10.6 SVL)和最少的停顿次数(1.9次)。北草蜥在光滑塑料地毯上具有最多的停顿次数(4.6次)。两种蜥蜴运动能力的种间差异显著。北草蜥具有较大的相对疾跑速度(北草蜥和中国石龙子:13.5 SVL/s vs 5.8 SVL/s)和攀附能力(143.8°vs 101.2°),但较小的游泳耐力(83.5 s vs 238.5 s)。运动速度与耐力之间存在种间权衡关系而与攀爬能力无进化冲突的结论。展开更多
文摘New born hatchlings of Calotes versicolor were reared in terrarium having narrow or wide perches for a period of 4-month and their snout vent length（SVL）, tail, fore and hindlimb lengths were measured at monthly intervals. Limb postures（closer to the body or spread away from the body） were also recorded. The sprint speed was recorded in two and four-month old lizards on a 1 m long race track providing 45° or 60° slope. In both the groups, SVL and tail lengths were comparable but the limb lengths and their growth rates were significantly greater in lizards of wider perch group. The lizards reared with narrow perches positioned their limbs closer to the body; while those reared on wider perches spread their limbs away from their body. Further, the latter exhibited significantly higher sprint speed regardless of the slope of the race track over those of narrow perch group. Sprint speeds of lizards in both groups were correlated with the limb sizes. The study showed that the lizards reared on narrow or wide perches exhibited divergent adaptive responses（phenotypic plasticity） by developing longer or shorter limbs and corresponding changes in their sprint speeds. These findings support the idea that availability of perch structure during early development evokes adaptive plasticity in the limb development and associated locomotory performance in arboreal lizards like C. versicolor.
文摘动物在野外生境中的活动能力通常会受到许多方面(例如,运动基质表面粗糙程度、遭遇障碍物的大小与形状)的影响。在特定体温(30℃)条件下,测量主要分布区重叠的两蜥蜴种类(北草蜥和中国石龙子)在四种不同基质表面(塑料草坪;表面粗糙不透底的塑料地毯;光滑具透底网格的塑料地毯和表面光滑的塑料地毯)的运动表现,以及两者的攀附能力和最大游泳耐力。基质类型显著影响两种蜥蜴的运动表现。两种蜥蜴在粗糙表面运动时的疾跑速明显大于光滑表面(例如,塑料草坪上北草蜥为15.7 SVL/s,中国石龙子为8.1 SVL/s;光滑塑料地毯上则分别为11.4 SVL/s和3.5 SVL/s)。中国石龙子在光滑塑料地毯上具有最大的持续运动距离(10.6 SVL)和最少的停顿次数(1.9次)。北草蜥在光滑塑料地毯上具有最多的停顿次数(4.6次)。两种蜥蜴运动能力的种间差异显著。北草蜥具有较大的相对疾跑速度(北草蜥和中国石龙子:13.5 SVL/s vs 5.8 SVL/s)和攀附能力(143.8°vs 101.2°),但较小的游泳耐力(83.5 s vs 238.5 s)。运动速度与耐力之间存在种间权衡关系而与攀爬能力无进化冲突的结论。
