Chesapeake Bay is the primary nursery for striped bass (Morone saxatilis), which are increasingly being exposed to hypoxic waters. Tolerance to hypoxia in fish is generally determined by a single exposure of an isolated individual or by exposing large groups of conspecifics to hypoxia without regard to social status. The importance of social context in determining physiological responses to stressors is being increasingly recognized. To determine whether social interactions influence hypoxia tolerance (HT) in striped bass, loss of equilibrium HT was assessed in the same fish while manipulating the social environment around it. Small group settings were used to be more representative of the normal sociality experienced by this species than the paired encounters typically used. After establishing the dominance hierarchy within a group of fish, HT was determined collectively for the individuals in that group, and then new groups were constructed from the same pool of fish. Individuals could then be followed across multiple settings for both repeatability of HT and hierarchy position ( X ¯ = 4.2 ± 0.91 SD groups per individual). HT increased with repeated exposures to hypoxia ( P < 0.001 ), with a significant increase by a third exposure ( P = 0.004 ). Despite this changing HT, rank order of HT was significantly repeatable across trials for 6 mo ( P = 0.012 ). Social status was significantly repeatable across trials of different group composition ( P = 0.02 ) and unrelated to growth rate but affected HT weakly in a complex interaction with size. Final HT was significantly correlated with blood [hemoglobin] and hematocrit. The repeatability and large intraspecific variance of HT in juvenile striped bass suggest that HT is potentially an important determinant of Darwinian fitness in an increasingly hypoxic Chesapeake Bay.

中文翻译：

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各个少年条纹鲈鱼低氧耐受性的低重复性和社会地位的影响。

切萨皮克湾（Chesapeake Bay）是条纹鲈（Morone saxatilis）的主要苗圃，条纹鲈越来越暴露于低氧水域。鱼类对缺氧的耐受性通常是由单个个体的一次暴露或使大量同种亚群暴露于缺氧状态而不考虑社会地位来确定的。人们越来越认识到社会背景在确定对压力源的生理反应中的重要性。为了确定社交互动是否会影响条纹鲈鱼的耐缺氧性（HT），我们在操纵同一条鱼类的周围环境时，评估了平衡性HT的损失。与通常使用的成对相遇相比，小群环境被用来代表该物种所经历的正常社交。在一群鱼中建立起主导地位之后，HT是针对该组中的每个人共同确定的，然后从相同的鱼池中建立新的组。然后可以在HT的可重复性和层次结构位置的多个设置上跟踪个人（每个人X = 4.2±0.91 SD组）。反复暴露于缺氧状态时HT升高（P <0.001），第三次暴露时HT显着升高（P = 0.004）。尽管HT发生了变化，但在6 mo的试验中HT的等级顺序仍可明显重复（P = 0.012）。在不同组组成的试验中，社会地位具有显着的可重复性（P = 0.02），与增长率无关，但在与大小的复杂相互作用中，对HT的影响较弱。最终的HT与血液[血红蛋白]和血细胞比容显着相关。