Like mother, like daughter： heritability of female Richardson＇s ground squirrel Urocitellus richardsonii cortisol stress responses
Like mother, like daughter： heritability of female Richardson＇s ground squirrel Urocitellus richardsonii cortisol stress responses作者机构：Department of Biological Sciences University of Manitoba Winnipeg Manitoba R3T 2N2 Canada Departmentof Biology University of Saskatchewan Saskatoon S7N 5E2 Saskatchewan Canada Department ofAnthropology Northwestern University Evanston 60208 Illinois USA Department of Biological SciencesKent State University Kent 44242 Ohio USA
出 版 物：《Current Zoology》 (动物学报（英文版）)
年 卷 期：2018年第64卷第2期
页 面：153-163页
核心收录：
学科分类：0710[理学-生物学] 090601[农学-基础兽医学] 07[理学] 0905[农学-畜牧学] 0906[农学-兽医学] 09[农学] 071002[理学-动物学]
基 金：provided by a Natural Sciences and Engineering Research Council of Canada (NSERC) Undergraduate Summer Research Award to K.R.B.N NSERC Discovery Grant funds
主 题：血浆皮质醇 压力反应 遗传性 母亲 松鼠 地面 环境变化 哺乳动物
摘 要：Activation of the hypothalamic-pituitary-adrenal (HPA) axis liberates glucocorticoids, which provides an acute indication of an individual s response to stressors. The heritability of the stress response in wild mammals, however, remains poorly documented. We quantified the cortisol stress response of female Richardson s ground squirrels (RGSs) to handling and physical restraint, testing for: (1) the effects of individual age, time of day, and sample latency; (2) repeatability within individuals; (3) narrow-sense heritability; and (4) differences among individuals owing to potential genetic and/or environmental effects. We detected a positive linear relationship between baseline plasma cortisol (BL-cortisol) concentration and stress-induced plasma cortisol (SI-cortisol) concentration that defined each individual s cortisol stress response. BL-cortisol, SI-cortisol, and stress response did not differ according to the time the sample was taken, or by subject age. Cortisol stress response was highly repeatable within individuals, had a mother-offspring heritability of = 0.40 ± 0.24 (mean ± SE), full-sibling heritability of , and half-sibling heritability of . Stress responses of sibling groups, immediate-family groups, and squirrels within a given area did not differ, whereas those of individuals from more distantly related matrilines did. Our results highlight the natural variability in HPA axis reactivity among individuals by quantifying both BL- and SI-cortisol levels, demonstrate partial heritability of the stress response that is not attributable to environmental variation, and suggest that at least part of an individual s stress response can be accounted for by differences in matrilineal history.
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