Effects of body temperature,feeding,caudal autotomy and reproductive condition on locomotor performance in the oriental leaf-toed gecko,(Hemidactylus bowringii)
Effects of body temperature,feeding,caudal autotomy and reproductive condition on locomotor performance in the oriental leaf-toed gecko,(Hemidactylus bowringii)
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作者：
Xu Da
我们设计了4个单独的实验，研究了体温、摄食、尾侧自切和生殖条件4个因素对东方叶趾壁虎（Hemidactylus bowringii）运动性能的影响。环境温度影响壁虎的体温，从而影响壁虎的运动性能。在较低温度范围内，冲刺速度随体温升高而升高，在较高温度范围内，冲刺速度下降。两性对冲刺速度的热依赖规律相似，但在任何体温水平下，成年雌性都比成年雄性跑得快一些，但男女之间的平均值没有统计学意义。在较低体温范围内（17℃~ 27℃），雌成虫不间断行进的最大距离（以下简称最大距离）随体温升高而增大，在较高体温范围内（27℃~ 37℃），雌成虫不间断行进的最大距离变化规律与雄成虫不同。在任何体温水平下，成年雄性比成年雌性跑得短，并且在最大距离上不受体温的显著影响。短跑速度与最大距离呈显著正相关。在排除最大距离变异的影响后，两性短跑速度仍无显著差异。在27℃和31℃实验体温下，雌虫的摄食、失尾和妊娠均降低了雌虫的冲刺速度。而且，壁虎的尾巴缺失也会减少最大距离，但雌性壁虎的进食和怀孕对最大距离没有影响。在大多数情况下，这些因素与体温和性别的相互作用的影响并不明显。这些结果表明，身体负担和尾侧自切可能是弓形蜥蜴运动能力变异的根源，一些内部和外部因素可能直接导致了一定程度的种群内运动能力变异。
We designed four separate experiments to study within population variation in locomotor performance in the oriental leaf-toed gecko(Hemidactylus bowringii)induced by four factors(body temperature,feeding,caudal autotomy and reproductive condition).Ambient temperature influenced the gecko's body temperature,thereby influencing its locomotor performance.Sprint speed increased with increasing in body temperature within the lower temperature range,and then decreased at higher body temperatures.The pattern of the thermal dependence of sprint speed was similar between both sexes,however,adult female run a little faster than adult male at any given level of body temperatures,but there was no statistically significance between the mean values for each sex.The maximal distance traveled without stopping(hereafter the maximal distance)increased with increasing in body temperature within the lower temperature range(from 17 ℃ to 27 ℃),and then did not vary at higher body temperatures(from 27 ℃ to 37 ℃)in adult females,but this pattern of the thermal dependence of maximal distance differed from adult males.Adult males run shorter than adult females at any given level of body temperatures,and were not significantly influenced by body temperature in the maximal distance.Sprint speed was positively correlated with the maximal distance in each sex.When the influence of variation in the maximal distance was removed,there was still no significant difference in sprint speed between both sexes.The feeding,tail loss and gravidity of females reduced sprint speed at the experimental body temperatures(27 ℃ and 31 ℃)in all case.And,tail loss of geckos also reduced the maximal distance,but taking food or gravidity of females did not.The effects of interaction of these factors with body temperature and sexes were not apparent in most case.These results suggest that physical burden and caudal autotomy should be the origin of variation in locomotor capacity in H.bowringii.We conclude that some internal and external factors may proximately induce a certain degree of intrapopulational variation in functional performance of lizards.