Testosterone might not be necessary to support female aggression in incubating northern cardinals
Testosterone might not be necessary to support female aggression in incubating northern cardinals
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在孵化北方红雀时，睾丸激素可能不是支持雌性攻击行为所必需的
DOI：
10.1016/j.anbehav.2015.06.016
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发表时间：
2015
期刊：
影响因子：
2.5
通讯作者：
J. Jawor
中科院分区：
文献类型：
--
作者：
M. S. DeVries;Caitlin P. Winters;J. Jawor
重点鸟类的巢防御和激素对防御的影响研究得很少。我们比较了雌性北方红雀的巢防御和睾酮（T）。T与红雀的攻击无关，尽管水平升高。只有低水平的T可能需要促进母性攻击。睾酮（T）对雄性攻击的影响在许多脊椎动物物种中已经得到证实，但T对女性攻击行为的影响却知之甚少。在鸟类中，T和雌性侵略之间的联系是合理的，因为许多物种的雌性在繁殖开始时表现出T浓度的季节性峰值，此时社会不稳定性最大，并且它们可能在繁殖季节的大部分时间内循环T。然而，研究T和女性的侵略之间的关系的调查很少，并产生了相互矛盾的结果，与实验或内源性升高的T支持侵略行为的女性的一些物种，但不是其他人，和T升高与侵略在某些点的生殖周期，但不是其他人。我们研究了内源性水平的T和女性的侵略之间的关系，在北方红衣主教，红衣主教，一个居民温带物种，对表现出长期的领土和女性有可测量的水平T全年，包括所有阶段的繁殖（孵化，雏鸟喂养等）。使用模拟的巢入侵，我们评估了侵略性的反应孵化的女性在巢内的性“入侵者”和量化的T水平后，每一个侵略性的遭遇。对“入侵者”的攻击表现在女性中各不相同;然而，表现出更高水平攻击的个体并没有表现出更高水平的T。这些结果表明，T可能不支持该物种的母性攻击。
HighlightsNest defence in birds and the impacts of hormones on defence are poorly studied.We compared nest defence with testosterone (T) in female northern cardinals.T did not covary with aggression in cardinals, although levels were elevated.Only low levels of T may be needed to facilitate maternal aggression.Testosterone's (T) influence on male aggression has been well established in many vertebrate species, but the impact of T on female aggressive behaviour is poorly understood. Among birds, a link between T and female aggression is plausible, as females of many species exhibit a seasonal peak in T concentrations at the onset of breeding when social instability is greatest and they may have circulating T through much of the breeding season. However, investigations examining the relationship between T and female aggression are few and have yielded conflicting results, with experimentally or endogenously elevated T supporting aggressive behaviour in females of some species but not others, and T elevating with aggression at some points of the reproductive cycle but not others. We examined the relationship between endogenous levels of T and female aggression in the northern cardinal, Cardinalis cardinalis, a resident temperate species in which pairs exhibit prolonged territoriality and females have measurable levels of T year-round, including all stages of reproduction (incubation, nestling feeding, etc.). Using simulated nest intrusions, we assessed aggressive responses of incubating females to intrasexual ‘intruders’ at the nest and quantified T levels after each aggressive encounter. Displays of aggression towards ‘intruders’ varied among females; yet, individuals showing greater levels of aggression did not demonstrate higher levels of T. These results imply that T might not support maternal aggression in this species.
黑眼灯笼草 HPG 轴的高度上下文特异性激活及其对挑战假设的影响。
影响因子：
2.7
作者：
Rosvall,KimberlyA;Peterson,MarkP;Reichard,DustinG;Ketterson,EllenD
通讯作者：
Ketterson,EllenD