A major cause of reproductive failure in birds is nest predation. Predation risk depends on predator type, as predators vary in their ecology and sensory modalities (e.g. visual vs. olfactory). Snakes (generally olfactory predators) are a major nest predator for small birds, with predation strongly associated with higher temperatures. We investigated nest survival in a ground‐nesting alpine species, the Cape Rockjumper Chaetops frenatus, endemic to alpine fynbos in southwestern South Africa. We collected 3 years of nest data, testing whether nest survival was related to (1) habitat stage (early post‐fire vs. late post‐fire habitat, ≤ 3 and > 3 years since fire respectively), (2) nest concealment and (3) temperature. We found that nests had better survival at lower temperatures, with snake predation (our main source of predation) increasing in higher temperatures.

中文翻译：

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升高的温度增加了濒临灭绝的高山地面筑巢鸟类Cape Rockjumper Chaetops frenatus繁殖失败的风险

鸟类繁殖失败的主要原因是巢捕食。捕食风险取决于捕食者的类型，因为捕食者的生态和感觉方式（例如视觉与嗅觉）有所不同。蛇（通常是嗅觉的捕食者）是小鸟的主要巢式捕食者，其捕食与温度升高密切相关。我们调查了在地面嵌套的高山物种Cape Rockjumper Chaetops frenatus中巢的生存情况，是南非西南部高山蕨类植物的特有种。我们收集了3年的巢数据，测试巢生存是否与（1）栖息地阶段（火灾后早期与火灾后晚期栖息，距火灾后分别≤3年和> 3年）有关，（2）巢藏和（3）温度。我们发现，在较低的温度下，巢的存活率更高，而在较高温度下，蛇的捕食（我们的主要捕食来源）会增加。