| 何胜梅,卢柳妍,刘康梅,蒋爱伍.2022.北热带石灰岩地区4种鸟类的胚胎心率特征.动物学杂志,57(2):161-169. |
| 北热带石灰岩地区4种鸟类的胚胎心率特征 |
| Embryonic Heart Rate of Four Bird Species in a North-Tropical Limestone Area, Southern China |
| 投稿时间：2021-10-11 修订日期：2022-03-02 |
| DOI：10.13859/j.cjz.202202001 |
| 中文关键词: 鸟类 胚胎心率 卵重 生活史对策 |
| 英文关键词:Bird Embryonic heart rate Egg mass Life history strategy |
| 基金项目:国家自然科学基金项目（No. 31870370） |
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| 中文摘要: |
| 胚胎心率是鸟类生活史的重要特征，能够反映鸟类胚胎新陈代谢的变化，有助于了解鸟类对环境变化的适应性。我国关于热带地区鸟类胚胎心率的研究较为缺乏。2021年4至7月，在广西弄岗国家级自然保护区，用红外线胚胎心率仪对北热带石灰岩地区4种常见鸟类的胚胎心率进行测量和分析。结果显示，红耳鹎（Pycnonotus jocosus）、黄腹山鹪莺（Prinia flaviventris）和黄腹鹟莺（Seicercus superciliaris）的胚胎心率在孵卵后的第4天开始出现，分别为（157.9 ± 20.5）次/min、（115.0 ± 48.5）次/min和（153.0 ± 11.7）次/min。白眉棕啄木鸟（Sasia ochracea）的胚胎心率在孵卵后的第5天出现（152.6次/min）。随着孵卵期增加，4种鸟类的胚胎心率总体呈现上升趋势。在种内水平上，红耳鹎、黄腹山鹪莺和黄腹鹟莺的胚胎日均增长心率、孵卵期80%时的心率和最大心率与其自身的新鲜卵重不存在显著相关性。在种间水平上，卵重与胚胎日均增长心率不存在显著相关，但与孵卵期80%时的胚胎心率和胚胎最大心率存在显著负相关。本研究表明，北热带石灰岩地区鸟类卵重量与孵卵期80%时的胚胎心率和胚胎最大心率存在种间显著负相关性，但种内相关性不显著。 |
| 英文摘要: |
| [Objectives] Embryonic heart rate is an important life history trait in birds. Studying the embryonic heart rate and its correlation to egg mass will provide valuable knowledge to understand life history strategy. However, the information about the embryonic heart rate of tropical birds is still poorly known in China. [Methods] We investigated the embryonic heart rate of four bird species using Buddy Digital Egg Monitor around Nonggang National Nature Reserve in Guangxi, Southern China, from April to July in 2021. We used Independent Sample T-test to analyze the data of embryonic heart rates and fresh egg masses. Pearson correlation analysis was employed to analyze the correlation between daily growth of embryonic heart rates, heart rates at 80% of incubation days, maximum heart rates, and fresh egg masses. In addition, the correlation between daily growth of embryonic heart rates, heart rates at 80% of incubation days, maximum heart rates, and fresh egg masses in interspecific was determined by Power-Function regression analysis. [Results] Our results suggested that embryonic heart rates of Red-whiskered Bulbul (Pycnonotus jocosus), Yellow-bellied Prinia (Prinia flaviventris), and Yellow-bellied Warbler (Seicercus superciliaris) began to appear from the 4th day of incubating. The 4th-day heart rates were 157.9 ± 20.5 beats/min (Fig. 1a), 115.0 ± 48.5 beats/min (Fig. 1b) and 153.0 ± 11.7 beats/min (Fig. 1c), respectively. White-browed Piculet (Sasia ochracea)’s embryonic heart rate began to appear from the 5th day of incubating (152.6 beats/min) (Fig. 1d). With the increase of incubation duration, the embryonic heart rates of the four birds showed an upward trend in general (Fig. 1). Within three species of passerine birds, changes in daily growth of embryonic heart rates, heart rates at 80% of incubation days, and maximum heart rates were not significantly related to fresh egg masses (Table 1 and Fig. 2). There were no significant correlations between daily growth of embryonic heart rates and fresh egg masses among the four bird species (Fig. 3). [Conclusion] To summarize, our findings indicated that there was an interspecies negative correlation between egg mass and maximum embryonic heart rate at 80% of incubation in northern tropical limestone region, however, the intraspecific correlation between egg mass and embryonic heart rate was not significant. |
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