From record performance to hypoxia tolerance:: respiratory transition in damselfish larvae settling on a coral reef
From record performance to hypoxia tolerance:: respiratory transition in damselfish larvae settling on a coral reef
复制标题
DOI：
10.1098/rspb.2006.3706
复制
发表时间：
2007-01-07
影响因子：
4.7
通讯作者：
Grutter, Alexandra S.
中科院分区：
文献类型：
--
作者：
Nilsson, Goran E.;Ostlund-Nilsson, Sara;Grutter, Alexandra S.
就体型而言，游动速度最快的鱼类是在珊瑚礁鱼幼虫中发现的，它们正准备在珊瑚礁上定居。通过测试两种雀鲷（Chromis atripectoralis 和 Pomacentrus amboinensis），我们发现，定居前幼鱼的高游泳速度伴随着变温脊椎动物有史以来最高的摄氧率。正如预期的那样，如此高的摄氧率是以较差的缺氧耐受性为代价的。然而，当珊瑚礁鱼类在珊瑚群落内寻求夜间庇护所以躲避捕食者时，就需要耐缺氧，而珊瑚群落在夜间可能会成为严重缺氧的微生境。当幼虫在珊瑚礁上定居时，我们发现它们经历了惊人的呼吸转变，即快速吸氧的能力下降，而低氧水平下高亲和力吸氧的能力却增加了。当它们在珊瑚礁上定居时，需要这种向缺氧耐受性的转变。我们的发现进一步证实了这一点：Acanthochromis polyacanthus（一种缺乏浮游幼虫阶段的雀鲷）的小型常驻幼虫没有表现出这样的转变，它们很好地适应了缺氧，并且表现出相对较低的最大摄氧率，随着年龄的增长变化很小。
The fastest swimming fishes in relation to size are found among coral reef fish larvae on their way to settle on reefs. By testing two damselfishes, Chromis atripectoralis and Pomacentrus amboinensis, we show that the high swimming speeds of the pre-settlement larvae are accompanied by the highest rates of oxygen uptake ever recorded in ectothermic vertebrates. As expected, these high rates of oxygen uptake occur at the cost of poor hypoxia tolerance. However, hypoxia tolerance is needed when coral reef fishes seek nocturnal shelter from predators within coral colonies, which can become severely hypoxic microhabitats at night. When the larvae settle on the reef, we found that they go through a striking respiratory transformation, i.e. the capacity for rapid oxygen uptake falls, while the ability for high-affinity oxygen uptake at low oxygen levels is increased. This transition to hypoxia tolerance is needed when they settle on the reef; this was strengthened by our finding that small resident larvae of Acanthochromis polyacanthus, a damselfish lacking a planktonic larval stage, do not display such a transition, being well adapted to hypoxia and showing relatively low maximum rates of oxygen uptake that change little with age.