Aerobic capacity in wild satin bowerbirds: repeatability and effects of age, sex and condition
Aerobic capacity in wild satin bowerbirds: repeatability and effects of age, sex and condition
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DOI：
10.1242/jeb.055046
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发表时间：
2011-10-01
影响因子：
2.8
通讯作者：
Borgia, Gerald
中科院分区：
文献类型：
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作者：
Chappell, Mark A.;Savard, Jean-Francois;Borgia, Gerald
有氧能力的个体差异已被广泛研究，特别是关于条件、成熟度或病原体感染，并获得对表现的机制基础的洞察。然而，它与交配竞争的关系还不太清楚，特别是对于自然栖息地的动物。我们检测了野生锦鸡鸟的有氧能力[强迫运动中最大氧耗率((V)对DOT(O2，max))]，这是一种澳大利亚雀鸟，具有非资源型交配系统和强烈的雄鸟间性别竞争。我们测试了质量和(V)对点(O2，max)的重复性，年龄和性别类别之间的差异，以及几个条件指数的影响。在成年雄性中，我们研究了有氧运动和弓箭所有权之间的相互作用(雄性交配成功所必需的)。年内和年间质量和(V)对点(O2，max)的重复性显著，但年间重复性低于年内重复性。(V)点上(O2，max)随质量(0.791)的总体比例而变化，但(V)上点(O2，max)的大部分变化不能用质量来解释。状态指标(颧骨和翼长的不对称性，颧骨的长度与质量的比率)与(V)/点(O2，max)无关。在所有年龄-性别类别中，体外寄生虫计数与(V)/点(O2，max)之间的相关性很弱，但在任何类别内都不相关。交配竞争最激烈的成年雄鸟比幼鸟或成年雌鸟具有更高的(V)/(O2，max)。然而，拥有弓的雄鼠的(V)Over Dot(O2，max)与未持有弓的雄鼠的(V)over Dot(O2，max)没有差别。因此，决定雄性繁殖成功的一个主要因素与有氧运动无关。
Individual variation in aerobic capacity has been extensively studied, especially with respect to condition, maturity or pathogen infection, and to gain insights into mechanistic foundations of performance. However, its relationship to mate competition is less well understood, particularly for animals in natural habitats. We examined aerobic capacity [maximum rate of O-2 consumption ((V) over dot(O2,max)) in forced exercise] in wild satin bowerbirds, an Australian passerine with a non-resource based mating system and strong intermale sexual competition. We tested for repeatability of mass and (V) over dot(O2,max), differences among age and sex classes, and effects of several condition indices. In adult males, we examined interactions between aerobic performance and bower ownership (required for male mating success). There was significant repeatability of mass and (V) over dot(O2,max) within and between years, but between-year repeatability was lower than within-year repeatability. (V) over dot(O2,max) varied with an overall scaling to mass(0.791), but most variance in (V) over dot(O2,max) was not explained by mass. Indicators of condition (tarsus and wing length asymmetry, the ratio of tarsus length to mass) were not correlated to (V) over dot(O2,max). Ectoparasite counts were weakly correlated to (V) over dot(O2,max) across all age-sex classes but not within any class. Adult males, the cohort with the most intense levels of mating competition, had higher (V) over dot(O2,max) than juvenile birds or adult females. However, there was no difference between the (V) over dot(O2,max) of bower-owning males and that of males not known to hold bowers. Thus one major factor determining male reproductive success was not correlated to aerobic performance.