Energetics of Hypoxia in a Mouth‐Brooding Cichlid: Evidence for Interdemic and Developmental Effects
Energetics of Hypoxia in a Mouth‐Brooding Cichlid: Evidence for Interdemic and Developmental Effects
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口育慈鲷缺氧的能量学：流行间和发育影响的证据
DOI：
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发表时间：
2010
影响因子：
1.6
通讯作者：
Lauren J. Chapman
中科院分区：
文献类型：
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作者：
E. E. Reardon;Lauren J. Chapman
我们使用了一个共同的花园饲养实验，以探索环境诱导的耐受缺氧的非洲口孵慈鲷Pseudocrenilabrus。分别在低溶氧和高溶氧条件下对3个群体的F1代鱼进行了常规代谢率（RMR）、临界氧压（Pcrit）和边际代谢范围（MMS）的测定。在第二个饲养实验中，我们比较了在低DO和高DO下生长的低DO来源的育雏和非育雏雌性的RMR。在低DO下饲养的鱼比在高DO下饲养的鱼具有较低的Pcrit。也有治疗和性别之间的相互作用，女性有一个较高的Pcrit比男性在常氧下饲养。RMR的变化主要由群体效应驱动，治疗与群体之间存在相互作用。无论人群或治疗如何，男性的MMS均高于女性。在低DO下饲养的鱼比在高DO下饲养的鱼具有更高的MMS，除了高DO群体之外，其中没有治疗效果。育雏女性有较高的RMR比postbrooding女性无论生长治疗，表明精力充沛的育雏成本。结果表明，一个强大的元素Pcrit的发展可塑性在整个人口和塑料和遗传成分的RMR和MMS的变化。这项研究还强调了口孵鱼的父母护理成本，这可能会以父母的精力为代价增加后代的健康，这一成本在缺氧情况下可能会升高。
We used a common‐garden rearing experiment to explore environmentally induced tolerance to hypoxia in the African mouth‐brooding cichlid Pseudocrenilabrus multicolor. F1 fish originating from three field populations were grown under low or high dissolved oxygen (DO), and their resting routine metabolic rate (RMR), critical oxygen tension (Pcrit), and marginal metabolic scope (MMS) were quantified. In a second rearing experiment, we compared the RMR of brooding and nonbrooding females of low‐DO origin grown under low and high DO. Fish reared under low DO had a lower Pcrit than fish reared under high DO. There was also an interaction between treatment and gender; females had a higher Pcrit than males when reared under normoxia. Variation in RMR was driven primarily by population effects, and there was an interaction between treatment and population. Regardless of population or treatment, males had a higher MMS than females. Fish reared under low DO had a higher MMS than fish reared under high DO, except for the high‐DO population in which there was no treatment effect. Brooding females had a higher RMR than postbrooding females regardless of the growth treatment, indicating an energetic cost to brooding. The results suggest a strong element of developmental plasticity in Pcrit across populations and both plastic and genetic components of variation in the RMR and MMS. This study also highlights the cost of parental care in mouth‐brooding fishes, which may increase the fitness of the offspring at the energetic expense of the parent, a cost that may be elevated under hypoxia.