Hannes R P, Franck D
Horm Behav. 1983 Sep;17(3):292-301. doi: 10.1016/0018-506x(83)90028-4.
The blood androgen and glucocorticoid levels of male Haplochromis burtoni and Xiphophorus helleri were measured in socially isolated individuals (8 and 4 weeks, respectively) and nonisolated controls. In both species social isolation leads to significant reductions of mean concentrations and variances, both for androgens and corticosteroids. It is known for H. burtoni--and new evidence for X. helleri is presented--that social isolation reduces aggressivity in nonescalating situations. It is proposed that social stimuli in both species stimulate the testes to produce more androgenic hormones, and that this can lead to higher levels of aggression. At least in tropical fish species the androgenic optimum for defending a territory or a social status may be much more controlled by social stimuli than previously realized.
对社会隔离的雄性伯氏朴丽鱼和剑尾鱼的血液雄激素和糖皮质激素水平进行了测量（分别隔离8周和4周），并与未隔离的对照组进行对比。在这两个物种中，社会隔离都会导致雄激素和皮质类固醇的平均浓度及方差显著降低。已知伯氏朴丽鱼会出现这种情况，本文还提供了剑尾鱼的新证据，即社会隔离会降低非升级情境中的攻击性。有人提出，这两个物种中的社会刺激会刺激睾丸产生更多雄激素，进而导致更高水平的攻击性。至少在热带鱼类中，用于捍卫领地或社会地位的雄激素最佳水平可能比之前认为的更多地受社会刺激的控制。
