Morph- and sex-specific effects of challenging conditions on maintenance parameters in the Gouldian finch
Morph- and sex-specific effects of challenging conditions on maintenance parameters in the Gouldian finch
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DOI：
10.1242/jeb.196030
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发表时间：
2019-04-01
影响因子：
2.8
通讯作者：
Beaulieu, Michaeel
中科院分区：
文献类型：
--
作者：
Fragueira, Rita;Verhulst, Simon;Beaulieu, Michaeel
种内离散多态性与不同生活史策略的使用有关，反映在不同形态个体的不同生殖或复制策略上。然而，与不同的生活史策略相关的特定形态的成本和收益仍然不清楚。在这里，我们研究了多态性的黄喉燕雀（红喉燕雀）是否标记的体细胞维护（身体质量，氧化状态和端粒长度）之间的红头和黑头的鸟类精力充沛的要求条件下（在不同强度的热浪，并在换羽或繁殖热浪）。在热浪期间，红头鸟表现出均匀的反应，因为雄性和雌性最初倾向于增加体重，并且无论热浪强度如何，血浆氢过氧化物水平（氧化损伤的标志物）都有所降低。相比之下，黑头鸟表现出更强和更异质的反应，作为黑头男性获得质量开始的热中性热浪，并表现出稳定的氧化状态，而黑头女性失去质量，并往往表现出较高的氢过氧化物水平结束时的热临界热浪。在热浪之后，我们发现由于换羽或繁殖而产生的特定形态的氧化成本，氧化标记物仅在黑头鸟中变化。同样，黑头雄性和雌性的氧化标记物变化不同，因为血浆抗氧化能力在换羽或繁殖雌性中降低，而雄性在较大的窝中表现出较高的氢过氧化物水平。我们的研究第一次强调，在多态物种中，一些个体在应对能量需求条件时比其他个体更脆弱。在气候变化的背景下，这种差异效应最终可能会改变目前观察到的自然种群中的变种和性别之间的平衡。
Intraspecific discrete polymorphism is associated with the use of alternative life-history strategies, reflected by distinct reproductive or copying strategies in individuals of differentmorphs. Yet, morph-specific costs and benefits related to different life-history strategies remain unclear. Here, we examined in the polymorphic Gouldian finch (Erythrura gouldiae) whether markers of somatic maintenance (body mass, oxidative status and telomere length) differed between red- and black-headed birds under energetically demanding conditions (during heatwaves of different intensity, and during moult or breeding following heatwaves). During heatwaves, red-headed birds showed a homogeneous response, as males and females initially tended to gain mass and had reduced plasma hydroperoxide levels (a marker of oxidative damage) irrespective of heatwave intensity. In contrast, black-headed birds showed a stronger andmore heterogeneous response, as black-headed males gained mass at the beginning of the thermoneutral heatwave and showed stable oxidative status, whereas black-headed females lost mass and tended to show higher hydroperoxide levels at the end of the thermocritical heatwave. Following heatwaves, we found morph-specific oxidative costs owing to moult or reproduction, with oxidative markers varying only in black-headed birds. Again, oxidative markers varied differently in black-headed males and females, as plasma antioxidant capacity decreased inmoulting or breeding females, whereasmales showed higher hydroperoxide levels with larger broods. For the first time, our study highlights that within polymorphic species, some individuals appearmore vulnerable than others when coping with energetically demanding conditions. In the context of climate change, such differential effects may ultimately alter the currently observed balance between morphs and sexes within natural populations.