Red does not always outperform black: morph-specific behavioural variation in response to environmental changes
Red does not always outperform black: morph-specific behavioural variation in response to environmental changes
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红色并不总是优于黑色：响应环境变化的特定形态的行为变化
DOI：
10.1016/j.anbehav.2018.12.006
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发表时间：
2019
期刊：
影响因子：
2.5
通讯作者：
Beaulieu M
中科院分区：
文献类型：
--
作者：
Fragueira R;Beaulieu M
个体面临的不同选择压力导致物种内出现不同的表型。由于气候变化而迅速变化的环境条件可能会改变这些选择压力，从而改变物种内表型之间当前的平衡。在鸟类中，颜色多态性与替代行为策略有关，可能是颜色变形之间对极端环境条件的不同反应的基础。在这里，我们通过测量红头和黑头胡锦雀（Erythrura gouldiae）的摄食行为、对新奇事物的反应和行为反应，研究了红头胡锦雀和黑头胡锦雀（Erythrura gouldiae）如何对实验诱发的不同强度的热浪做出反应。由于红头鸟在生理上被描述为比黑头鸟更具可塑性，因此我们预计它们会更强烈地改变自己的行为以应对热浪。尽管黑头雄性总体上进食量比其他鸟类少（因此表明能量需求较低），但变体之间的进食行为差异仍然不受热条件的影响。然而，在不同的热条件下，鸟类对新奇事物的反应因形态而异。事实上，在热处理之前，黑头鸟，无论性别如何，比红头鸟在新物体附近花费的时间更少，从而表明对新奇事物的兴趣较低。然而，由于只有红头鸟会减少热浪期间靠近新奇物体的时间，因此在这些热条件下，不同品种之间对新奇事物兴趣的差异消失了。这些结果表明，不同颜色胡锦雀对热条件的反应的行为可塑性不同，从而表明不同颜色形态之间的行为差异并不是静态的。物种内的这种行为调整如何影响面临极端环境条件的自然种群颜色变形之间的平衡仍有待确定。
Variable selection pressures on individuals contribute to the occurrence of distinct phenotypes within species. Rapidly changing environmental conditions due to climate change are likely to alter these selection pressures and hence the current balance between phenotypes within species. In birds, colour polymorphism has been related to alternative behavioural strategies, potentially underlying different responses to extreme environmental conditions between colour morphs. Here, we examined how red- and black-headed Gouldian finches,Erythrura gouldiae, responded to experimentally induced heatwaves of different intensities by measuring their feeding behaviour, their response to novelty and their behavioural reactivity. As red-headed birds have been described as physiologically more plastic than black-headed birds, we expected them to alter their behaviour more strongly in response to heatwaves. Even though black-headed males fed overall less than other birds (thereby suggesting lower energy requirements), differences in feeding behaviour between morphs remained unaffected by thermal conditions. However, birds’ response to novelty varied between morphs under variable thermal conditions. Indeed, before thermal treatment, black-headed birds, irrespective of their sex, spent less time near a novel object than red-headed birds, thereby suggesting lower novelty interest. However, because only red-headed birds reduced the time spent close to a novel object during heatwaves, differences in novelty interest between morphs disappeared under these thermal conditions. These results suggest that behavioural plasticity in response to thermal conditions differ between colour morphs of Gouldian finches, thereby showing that behavioural differences between morphs are not static. How such behavioural adjustments within species affect the balance between colour morphs in natural populations facing extreme environmental conditions remains to be determined.
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DOI：
--
发表时间：
2011
期刊：
影响因子：
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作者：
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DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
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DOI：
--
发表时间：
1967
期刊：
影响因子：
--
作者：
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