DeNardo D F, Sinervo B
Department of Integrative Biology, University of California, Berkeley 94720.
Horm Behav. 1994 Sep;28(3):273-87. doi: 10.1006/hbeh.1994.1023.
Steroid hormones play a major role in influencing the physiology and behavior of all animals, including reptiles. Oftentimes, it is an interaction between two or more hormones that is ultimately responsible for the observed response or behavior. We designed a pair of field studies on adjacent communities of side-blotched lizards (Uta stansburiana) to provide insight into the interrelationship of testosterone (T) and corticosterone (B) in regulating aggressive behavior. On one site, males were implanted with either T or saline (S), while on the other site males received either two S implants or both a T and a B implant (T + B). T increased both activity (by 31%) and home-range size (by 150%), whereas S-implanted cohorts exhibited a reduction in both of these parameters (by 24 and 50%, respectively). However, when B was given in combination with T, not only were the positive effects of T eliminated, but there was a reduction in activity (31%) and home-range size (72%) similar to that reported in lizards that received B implants alone. S-implanted cohorts in the T + B experiment increased their activity and home-range size by 15 and 43%, respectively. Although these latter changes in the S-implanted males are not statistically significant, they are indicative of a compensatory increase similar to that seen in the T and previously reported B outcrop experiments. Taken together, these results illustrate that regulation of aggressive behavior is complicated, with both hormonal and social interactions playing critical roles in determining an individual's home-range size and, hence, reproductive success.
类固醇激素在影响包括爬行动物在内的所有动物的生理和行为方面发挥着重要作用。通常，最终导致观察到的反应或行为的是两种或更多种激素之间的相互作用。我们针对相邻的侧斑蜥蜴（Uta stansburiana）群落设计了两项实地研究，以深入了解睾酮（T）和皮质酮（B）在调节攻击行为中的相互关系。在一个地点，雄性蜥蜴被植入T或生理盐水（S），而在另一个地点，雄性蜥蜴接受两个S植入物或一个T和一个B植入物（T + B）。T使活动量增加了31%，活动范围大小增加了150%，而植入S的组群在这两个参数上均出现下降（分别下降了24%和50%）。然而，当B与T联合使用时，不仅T的积极作用被消除，而且活动量（31%）和活动范围大小（72%）也出现下降，这与单独接受B植入物的蜥蜴所报告的情况相似。在T + B实验中，植入S的组群的活动量和活动范围大小分别增加了15%和43%。尽管植入S的雄性蜥蜴的这些后期变化在统计学上不显著，但它们表明了一种补偿性增加，类似于在T和之前报道的B露头实验中所看到的情况。综上所述，这些结果表明攻击行为的调节很复杂，激素和社会相互作用在决定个体的活动范围大小以及生殖成功率方面都起着关键作用。
