Gilbert Anthony L, Wayne Sydney M, Norris Mike C, Rodgers John M, Warner Daniel A
Ecol Evol Physiol. 2024 Sep-Oct;97(5):292-301. doi: 10.1086/733349. Epub 2024 Oct 28.
AbstractUnderstanding the relationship between the environment parents experience during reproduction and the environment embryos experience in the nest is essential for determining the intergenerational responses of populations to novel environmental conditions. Thermal stress has become commonplace for organisms inhabiting areas affected by rising temperatures. Exposure to body temperatures that approach, but do not exceed, upper thermal limits often induces adverse effects in organisms, but the propensity for these temperatures to have intergenerational consequences has not been explored in depth. Here, we quantified the effects of thermal stress on the reproductive physiology and development of brown anoles () when thermal stress is experienced by mothers and by eggs during incubation. Mothers exposed to thermal stress produced smaller eggs and smaller offspring with reduced growth rates, while egg stress reduced developmental time and offspring mass. Hatchling survival and growth were negatively affected by thermal stress experienced by mothers but not by thermal stress experienced as eggs. We found mixed evidence for an additive effect of thermal stress on offspring; rather, thermal stress had specific (and most often negative) effects on different components of offspring phenotypes and fitness proxies when experienced either by mothers or by eggs. Stressful body temperatures therefore can function in a similar manner to other types of maternal effects in reptiles; however, this maternal effect has predominantly negative consequences on offspring.
摘要
了解亲代在繁殖过程中所经历的环境与胚胎在巢穴中所经历的环境之间的关系，对于确定种群对新环境条件的代际反应至关重要。热应激对于栖息在受气温上升影响地区的生物来说已变得很常见。暴露于接近但不超过热上限的体温通常会对生物产生不利影响，但这些温度产生代际后果的倾向尚未得到深入研究。在这里，我们量化了热应激对棕色安乐蜥（）繁殖生理学和发育的影响，热应激分别由母体和孵化期间的卵所经历。暴露于热应激的母体产出的卵更小，后代也更小，生长速率降低，而卵应激则缩短了发育时间并减少了后代质量。幼体的存活和生长受到母体所经历的热应激的负面影响，但不受卵所经历的热应激的影响。我们发现热应激对后代存在累加效应的证据并不充分；相反，当热应激由母体或卵所经历时，它对后代表型和适合度指标的不同组成部分具有特定（且大多为负面）影响。因此，应激体温在作用方式上可能与爬行动物中的其他类型母体效应类似；然而，这种母体效应主要对后代产生负面后果。
