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Predation risk and mountain goat reproduction: Evidence for stress‐induced breeding suppression in a wild ungulate
Functional Ecology ( IF 4.6 ) Pub Date : 2020-01-10 , DOI: 10.1111/1365-2435.13514 Frédéric Dulude‐de Broin 1, 2 , Sandra Hamel 1, 3 , Gabriela F. Mastromonaco 4 , Steeve D. Côté 1, 2
中文翻译：
捕食风险和山羊繁殖：野生有蹄类动物受应激诱导的繁殖抑制的证据
更新日期：2020-01-10
Functional Ecology ( IF 4.6 ) Pub Date : 2020-01-10 , DOI: 10.1111/1365-2435.13514 Frédéric Dulude‐de Broin 1, 2 , Sandra Hamel 1, 3 , Gabriela F. Mastromonaco 4 , Steeve D. Côté 1, 2
Affiliation
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- Non‐consumptive effects of predation can strongly impact reproduction and demography of prey species. Still, the underlying mechanisms that drive non‐consumptive effects are not fully understood, and the circumstances under which chronic physiological stress may mediate these effects remain unclear.
- Benefiting from over 23 years of environmental, physiological and demographic data, we tested the hypothesis that predation risk may impair reproduction of mountain goats through chronic elevation of physiological stress. We conducted path analyses to assess the relationships between predation risk, faecal glucocorticoid metabolites and hair cortisol concentration, and reproduction, while taking into account the potential effects of age class, sex, body mass, season and within individual variation in glucocorticoid concentration.
- Predation risk had a direct positive effect on the average annual faecal glucocorticoid concentration in the population, which, in turn, negatively affected the proportion of reproductive females. The same pattern was observed with hair cortisol concentration, but these results were inconclusive potentially due to methodological challenges in estimating annual average of hair cortisol at the population level.
- Our study presents one of the first robust evidence that stress‐mediated breeding suppression can occur in a wild ungulate following increased predation risk, thereby providing a major insight on the mechanisms underlying non‐consumptive effects of predation in wild mammals.
中文翻译：
捕食风险和山羊繁殖：野生有蹄类动物受应激诱导的繁殖抑制的证据
- 捕食的非消费效应会严重影响猎物的繁殖和人口统计。尽管如此，导致非消费性作用的潜在机制仍未得到充分理解，并且慢性生理压力可能介导这些作用的环境仍不清楚。
- 受益于超过23年的环境，生理和人口统计数据，我们检验了以下假设：掠食风险可能会通过长期升高生理压力而损害山羊的繁殖。我们进行了路径分析，以评估捕食风险，粪便糖皮质激素代谢物和头发皮质醇浓度与繁殖之间的关系，同时考虑了年龄，性别，体重，季节以及糖皮质激素浓度个体差异的潜在影响。
- 捕食风险对人口中的年平均粪便糖皮质激素浓度具有直接的积极影响，进而对生殖女性的比例产生负面影响。头发皮质醇浓度也观察到了相同的模式，但是这些结果可能是不确定的，这可能是由于在人口水平上估算头发皮质醇的年平均值时所面临的方法上的挑战。
- 我们的研究提供了第一个有力的证据之一，即随着捕食风险的增加，在野生有蹄类动物中可以发生应激介导的繁殖抑制，从而提供了对野生哺乳动物捕食非消费效应的潜在机制的主要见解。
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