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The effect of normoxia exposure on hypoxia tolerance and sensory sampling in a swamp-dwelling mormyrid fish.
Comparative Biochemistry and Physiology A: Molecular & Integrative Physiology ( IF 2.1 ) Pub Date : 2019-10-22 , DOI: 10.1016/j.cbpa.2019.110586 Shelby B Clarke 1 , Lauren J Chapman 1 , Rüdiger Krahe 2
Comparative Biochemistry and Physiology A: Molecular & Integrative Physiology ( IF 2.1 ) Pub Date : 2019-10-22 , DOI: 10.1016/j.cbpa.2019.110586 Shelby B Clarke 1 , Lauren J Chapman 1 , Rüdiger Krahe 2
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Effects of energetic limitations on the performance of sensory systems are generally difficult to quantify. Weakly electric fishes provide an ideal model system to quantify the effects of metabolic stressors on sensory information acquisition, because they use an active-sensing strategy that permits easy measurement of the sensing effort. These fishes discharge an electric signal and sense perturbations of the resulting electric field. We used the mormyrid Petrocephalus degeni to quantify the relationship between routine metabolic rate and the rate of sensory sampling (rate of electric organ discharge, EOD) while under progressive hypoxia by quantifying the critical oxygen tension (PC-MR) and the critical electric organ discharge threshold (PC-EOD). PC-MR was significantly higher in fish acclimated to normoxia for over 40 days compared to animals tested within 1-5 days of capture from a hypoxic swamp, which suggests high costs of maintaining hypoxia tolerance; however, there was no acclimation effect on PC-EOD. All P. degeni reached their PC-EOD prior to their PC-MR. However, below the respective critical tension value, EOD rate decreased more gradually than the metabolic rate suggesting that the fish were increasing the proportion of their energy budget allocated to acquiring sensory information as dissolved-oxygen levels dropped. Trade-offs between sensory sampling and other physiological functions are also suggested by the increase in routine EOD rate with long-term normoxia acclimation, in contrast to metabolic rate, which showed no significant changes. These results highlight the relationship between sensory sampling and metabolic rate in response to progressive hypoxia and the plasticity of hypoxia tolerance.
中文翻译：
暴露于常氧环境对沼泽居住的多虫鱼的耐缺氧性和感官采样的影响。
能量限制对感觉系统性能的影响通常难以量化。弱电鱼提供了一种理想的模型系统，可以量化代谢应激源对感官信息获取的影响，因为它们使用主动感应策略，可以轻松测量感应力。这些鱼释放出电信号并感知所产生电场的扰动。我们利用病态的Petrocephalus degeni进行定量代谢过程中的临界氧张力（PC-MR）和临界电器官放电，从而量化了常规代谢率与感觉采样率（器官放电率，EOD）之间的关系，而在进行性缺氧时阈值（PC-EOD）。与在缺氧沼泽中捕获的1-5天之内测试的动物相比，适应常氧的鱼类在超过40天的时间内PC-MR显着更高，这表明维持低氧耐受性的成本很高；但是，对PC-EOD没有适应作用。所有的退化假单胞菌都在其PC-MR之前达到其PC-EOD。但是，在低于各自的临界张力值时，EOD速率的下降速度比新陈代谢速率的下降更为缓慢，这表明随着溶解氧水平的下降，鱼的能量预算中分配给获取感官信息的能量比例正在增加。长期的常氧适应使常规EOD速率增加也提示了感官采样与其他生理功能之间的权衡，而代谢速率则无明显变化。
更新日期：2019-10-22
中文翻译：
暴露于常氧环境对沼泽居住的多虫鱼的耐缺氧性和感官采样的影响。
能量限制对感觉系统性能的影响通常难以量化。弱电鱼提供了一种理想的模型系统，可以量化代谢应激源对感官信息获取的影响，因为它们使用主动感应策略，可以轻松测量感应力。这些鱼释放出电信号并感知所产生电场的扰动。我们利用病态的Petrocephalus degeni进行定量代谢过程中的临界氧张力（PC-MR）和临界电器官放电，从而量化了常规代谢率与感觉采样率（器官放电率，EOD）之间的关系，而在进行性缺氧时阈值（PC-EOD）。与在缺氧沼泽中捕获的1-5天之内测试的动物相比，适应常氧的鱼类在超过40天的时间内PC-MR显着更高，这表明维持低氧耐受性的成本很高；但是，对PC-EOD没有适应作用。所有的退化假单胞菌都在其PC-MR之前达到其PC-EOD。但是，在低于各自的临界张力值时，EOD速率的下降速度比新陈代谢速率的下降更为缓慢，这表明随着溶解氧水平的下降，鱼的能量预算中分配给获取感官信息的能量比例正在增加。长期的常氧适应使常规EOD速率增加也提示了感官采样与其他生理功能之间的权衡，而代谢速率则无明显变化。
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