| 王行行,万冬梅,张雷,王娟.2021.繁殖期杂色山雀应激水平的皮质酮浓度 与繁殖投入的关系.动物学杂志,56(6):836-843. |
| 繁殖期杂色山雀应激水平的皮质酮浓度 与繁殖投入的关系 |
| The Relationships of Stress-induced Corticosterone and Reproductive Investment in Varied Tits |
| 投稿时间：2021-03-16 修订日期：2021-11-15 |
| DOI：10.13859/j.cjz.202106005 |
| 中文关键词: 皮质酮 亲代投入 巢防卫 杂色山雀 |
| 英文关键词:Corticosterone Reproductive investment Nest defense Varied Tit, Sittiparus varius |
| 基金项目:国家自然科学基金项目（No. 31872231），辽宁省博士科研启动基金计划项目（No. 2019-BS-107） |
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| 中文摘要: |
| 皮质酮是鸟类重要的糖皮质激素，在其适应环境变化及压力应激反应中起重要的调节作用。非应激状态时，鸟类血浆皮质酮浓度处于基线水平，当鸟类面对应激刺激时，血浆皮质酮浓度迅速升高，应激水平的皮质酮对鸟类个体生存至关重要。然而，目前繁殖季鸟类血浆应激水平的皮质酮浓度变化及其与繁殖投入关系的研究结果存在种间差异，仍需在不同的物种中进行实验研究。本研究分析了繁殖季杂色山雀（Sittiparus varius）血浆应激水平的皮质酮浓度在繁殖阶段的变化，及育雏期亲鸟血浆应激水平的皮质酮浓度与繁殖参数和亲鸟育雏投入的关系。结果显示，与求偶期相比，育雏期杂色山雀亲鸟血浆应激水平的皮质酮浓度极显著升高（P < 0.001），雌性与雄性亲鸟之间无显著性差异（P > 0.05）；雌性与雄性亲鸟血浆应激水平的皮质酮浓度与繁殖参数、亲鸟递食投入、巢防卫行为均无显著相关性（P > 0.05）。 |
| 英文摘要: |
| Corticosterone (CORT) is one of the most important glucocorticosteroid in birds. When subjected to human interference, capture, harsh environment and other stress stimulation, the hypothalamic-pituitary- adrenal (HPA) axis is activated and corticosterone would be synthesized in large quantities, which then modifies physiology and behavior. Capture followed by the collection of blood samples over 5﹣30 min is a widely used stressor in studies of stress-induced corticosterone in birds. Stress-induced corticosterone is essential for individual survival. However, current results on the changes of plasma stress-induced corticosterone during the breeding seasons and its relationship with reproduction are significantly different, and experimental studies in different species are still needed. In our study, Varied Tits (Sittiparus varius) were caught with mist nets in the courtship periods (from March to April in 2019); and about 50 μl blood samples were taken by puncturing the brachial vein within 10﹣15 min. Parental birds were captured with nest-box traps when the nestlings were 6﹣8 days old, and blood samples were taken within 10﹣15 min. After centrifugalization, all blood plasma samples were analyzed for stress-induced corticosterone concentration by avian corticosterone ELISA kit. Independent sample t-test was used to compare the stress-induced corticosterone concentration during the courtship periods and nestling feeding periods. Multiple linear regression analysis was used to analyze the relationships between stress-induced corticosterone of parental birds in nestling feeding periods and the reproductive investment of Varied Tits. The results showed that, compared with the courtship periods, the stress-induced corticosterone concentration of Varied Tits increased significantly in nestling feeding periods (female: t(29, 29) =﹣10.782, df = 56, P < 0.05; male: t(50, 31) =﹣10.207, df = 43.099, P < 0.05; Fig. 1). And there was no significant difference between male and female parental birds (courtship: t(29, 50) =﹣0.684, df = 77, P > 0.05; nestling breeding period: t(29, 31) = 0.078, df = 58, P > 0.05; Fig. 1). The concentration of stress-induced corticosterone had no significant effect on reproductive parameters (P > 0.05; Fig. 2), feeding investment and nest defense (P > 0.05; Fig. 3). Our studies presented differences of plasma stress-induced corticosterone in breeding seasons of Varied Tits, and provided scientific basis for the researches and protection of Varied Tits. |
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