Effects of Reproductive Burden on Endurance Performance in Side-Blotched Lizards (Uta Stansburiana)
Effects of Reproductive Burden on Endurance Performance in Side-Blotched Lizards (Uta Stansburiana)
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DOI：
10.1670/07-090r1.1
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发表时间：
2008-03
影响因子：
5.2
通讯作者：
P. Zani;R. A. Neuhaus;T. D. Jones;J. Milgrom
中科院分区：
文献类型：
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作者：
P. Zani;R. A. Neuhaus;T. D. Jones;J. Milgrom
摘要生殖会产生与携带发育中的胚胎或卵子的负担有关的“成本”。许多使用有鳞爬行动物的研究已经证明了与生殖有关的运动性能的降低。最近几项实验研究试图确定运动性能的降低是物理性的还是生理性的。然而，尚未达成共识，有证据表明，影响是物种特异性的。此外，以前的研究没有记录性能的下降是否每年都是一致的。在这项研究中，我们测量的耐力表现在电动跑步机上的侧斑落叶松（Uta stansburiana）在其自然繁殖季节超过两年。我们这项研究的目的是确定（1）生殖状态在多大程度上降低了耐力，（2）女性是否能迅速恢复耐力（仅证明身体负担），以及（3）与生殖相关的表现变化是否每年都是一致的。两年来812次试验的结果显示，与生殖状态相关的耐力普遍下降，例如带壳卵的雌性只能跑80-85%的距离。这种性能的下降与相对离合器质量无关，表明有生理效应。然而，生殖后的女性恢复到nongravid水平的耐力产卵后12小时内，这表明性能下降是物理。结果在两个研究年的性质相似，表明与生殖相关的运动性能的变化可能是一致的，从一年到一年。
Abstract Reproduction can impose “costs” associated with the burden of carrying developing embryos or eggs. Numerous studies using squamate reptiles have documented a reduction in locomotor performance related to reproduction. Recently several experimental studies have attempted to determine whether the reduction in locomotor performance is physical or physiological. However, no consensus has been reached, and there is evidence that effects are species specific. In addition, no previous studies have documented whether the reduction in performance is consistent from year to year. For this study, we measured the endurance performance on a motorized treadmill of Side-Blotched Lizards (Uta stansburiana) during their natural breeding season over two years. Our goals for this study were to determine (1) to what degree reproductive state reduces endurance, (2) whether females recover endurance capacity quickly (evidence of physical burden only), and (3) whether the change in performance associated with reproduction is consistent from year to year. Results from 812 trials over two years revealed a general decrease in endurance capacity associated with reproductive state such that females with shelled eggs were only able to run 80–85% as far as nongravid females. This decrement in performance is not related to relative clutch mass, suggesting a physiological effect. However, post-reproductive females recovered to nongravid levels of endurance within ∼12 h of oviposition, suggesting the decrement in performance was physical. Results were qualitatively similar in both study years indicating that changes in locomotor performance associated with reproduction may be consistently imposed from year to year.