在一个合作繁殖的鸟,南方巴布勒,当天气炎热时,助手不帮忙
Amanda R Bourne1,2, Amanda R Ridley1,3, Susan J Cunningham1
1FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa.
概括
合作繁殖的鸟类,比如南方脚巴巴,表现出不平等的化努力. 助手在炎热的日子减少了化时间,与繁殖者不同,在高温下影响繁殖成功.
科学领域:
- 鸟类生态学 鸟类生态学
- 行为生态学 行为生态学
- 保护生物学 保护生物学
背景情况:
- 合作繁殖在鸟类中很常见,增强了繁殖的成功.
- 高温对许多物种的繁殖结果产生负面影响,包括合作繁殖的物种.
研究的目的:
- 为了调查助手对南方脚 (Turdoides bicolor) 的白天化贡献.
- 为了确定温度如何影响助手化努力.
主要方法:
- 在三个澳大利亚夏季繁殖季节收集的观测数据.
- 对育种者和助手的量化食和化时间百分比.
- 分析了环境温度和化行为之间的关系.
主要成果:
- 助手花费的时间比养殖者要多得多,食时间要少,化时间要少.
- 随着小组规模的增加,助手化贡献的减少.
- 助手在炎热的天气 (>35.5°C) 中显著减少了化努力,而育种者保持了努力.
- 帮助者和育种者之间的化工作量不平等性随着温度的增加而增加.
结论:
- 南方足巴布勒表现出不平等的化工作负载分布,在炎热的天气中,助手减少了工作量.
- 这种不平等的努力,特别是在热应激下,可能解释了为什么更大的群体大小并不总是减轻合作繁殖者高温的负面影响.
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