ABSTRACT The genus Aglaeactis is restricted to the high Andes, from Colombia to Bolivia. The breeding biology of the Shining Sunbeam (A. cupripennis) is well-known compared with the other three species of this genus, which have relatively small ranges. In this study we present the first description of the nest, eggs, and nestlings of the Peruvian endemic White-tufted Sunbeam (A. castelnaudii), and provide novel information using thermal sensors about the incubation behaviors of A. cupripennis in the highlands of southeastern Peru. The nest of A. castelnaudii was a compact, cup-shaped nest with an inner layer composed of soft beige plant material, possibly from ferns and seeds, and an external layer of fresh moss and cobwebs, “decorated” with pieces of bark, leaves, and lichens. For A. cupripennis the first incubation off-bout started at sunrise between 05:08 and 05:23, and trips continued throughout the day for approximately 13 hrs. (n = 10 days). Nest attentiveness was 61.04% ± 3.98. The species appears to use two distinct behavioral strategies to maintain optimal nest temperatures for embryonic development. Our findings suggest that these behavioral responses during the nesting stage may contribute to this clade’s successful reproduction in high elevation habitats.

中文翻译：

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首次描述秘鲁东南部的白簇日光（Aglaeactis castelnaudii）的巢、蛋和雏鸟以及闪耀的日光（A. cupripennis）的孵化行为

摘要 Aglaeactis 属仅限于从哥伦比亚到玻利维亚的安第斯山脉高地。与分布范围相对较小的该属的其他三个物种相比，Shining Sunbeam (A. cupripennis) 的繁殖生物学是众所周知的。在这项研究中，我们首次描述了秘鲁特有的白色簇绒阳光 (A. castelnaudii) 的巢穴、卵和雏鸟，并使用热传感器提供了有关东南部高地 A. cupripennis 孵化行为的新信息。秘鲁。A. castelnaudii 的巢是一个紧凑的杯形巢，内层由柔软的米色植物材料组成，可能来自蕨类植物和种子，外层是新鲜的苔藓和蜘蛛网，用树皮、树叶“装饰” ，和地衣。为一个。cupripennis 第一次孵化关闭在 05:08 至 05:23 日出时开始，并且全天旅行持续了大约 13 小时。（n = 10 天）。鸟巢注意力为 61.04% ± 3.98。该物种似乎使用两种不同的行为策略来维持胚胎发育的最佳巢穴温度。我们的研究结果表明，筑巢阶段的这些行为反应可能有助于该进化枝在高海拔栖息地成功繁殖。