Ungerfeld Rodolfo, Freitas-de-Melo Aline, Giriboni Julia, Lacuesta Lorena, Toledano-Díaz Adolfo, Santiago-Moreno Julián
Departamento de Fisiología, Facultad de Veterinaria, Universidad de la República, Lasplaces 1620, 11600, Montevideo, Uruguay.
Departamento de Biología Molecular y Celular, Facultad de Veterinaria, Universidad de la República, Lasplaces 1620, 11600, Montevideo, Uruguay.
Behav Processes. 2016 Dec;133:1-5. doi: 10.1016/j.beproc.2016.10.008. Epub 2016 Oct 13.
Aggressiveness is directly related to testosterone concentration, which varies with seasons and in response to female stimulation. The aim was to determine if the frequency and pattern of agonistic interactions between bucks varies seasonally and in response to oestrous female stimulation. In the first study we characterized the pattern of agonistic interactions during feeding throughout a whole year in groups of Iberian ibex bucks; and in the second study, we determined the influence of oestrous does on the frequencies of agonistic behaviours between Gabon bucks in different seasons. In Iberian ibex bucks, the frequency of agonistic behaviours was maximum in summer and testosterone concentration in late autumn. In Gabon bucks, total agonistic interactions increased in bucks stimulated by females in late summer and autumn. In late autumn there were more interactions without physical contact in stimulated than in isolated bucks. Aggressiveness in bucks varied along the year, but the seasonal pattern was related to the context in which behaviours were recorded. Stimulation with oestrous females induced an increase of aggressiveness during the breeding season. At least in the conditions of these studies, testosterone concentrations seemed not to be the main influence on the frequency in which aggressive behaviour was displayed.
攻击性与睾酮浓度直接相关，睾酮浓度会随季节变化以及对雌性刺激的反应而变化。目的是确定雄鹿之间争斗性互动的频率和模式是否随季节变化以及对处于发情期的雌性刺激的反应而变化。在第一项研究中，我们描述了伊比利亚野生山羊雄鹿群体全年进食期间争斗性互动的模式；在第二项研究中，我们确定了处于发情期的雌羊对不同季节加蓬雄鹿之间争斗行为频率的影响。在伊比利亚野生山羊雄鹿中，争斗行为的频率在夏季最高，而睾酮浓度在深秋最高。在加蓬雄鹿中，受到雌性刺激的雄鹿在夏末和秋季的争斗性互动总数增加。在深秋，受到刺激的雄鹿之间无身体接触的互动比隔离状态下的雄鹿更多。雄鹿的攻击性随年份变化，但季节性模式与记录行为的背景有关。在繁殖季节，用处于发情期的雌性进行刺激会导致攻击性增加。至少在这些研究的条件下，睾酮浓度似乎不是对攻击行为表现频率的主要影响因素。
