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首页> 外文期刊>Polar biology >The interrelated effects of body size and choroid rete development on the ocular O-2 partial pressure of Atlantic (Gadus morhua) and Greenland cod (Gadus ogac)
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The interrelated effects of body size and choroid rete development on the ocular O-2 partial pressure of Atlantic (Gadus morhua) and Greenland cod (Gadus ogac)

机译：体形和脉络膜网状组织发育对大西洋（Gadus morhua）和格陵兰鳕（Gadus ogac）的O-2分压的相互影响

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摘要

The interrelated effects of body size and choroid rete development on the ocular partial pressure of oxygen (PO2) of the mainly temperate Atlantic cod, Gadus morhua, and the exclusively polar Greenland cod, G. ogac, were investigated using micro-optode O-2 sensors. Due to a difference in geographical distribution, it is hypothesized that G. ogac will possess features favouring visual-metabolic processes in a cold, dark environment. The relative size of the eye was identical between species and exhibited negative body-size scaling. The oxygen-secreting retia of both gadid species are extremely well developed and, although variable, recordings of ocular PO2 were consistently and often greatly in excess of atmospheric pressures (27.7-138.3 kPa). The choroid rete was slightly more developed in G. ogac, but ocular PO2 was not significantly different between the two species. Choroid rete development scaled isometrically with body size in both species and may explain why differences in body size did not account for any of the variation in ocular PO2 measures. The hypothesis that polar-fish species exhibit marked visual-metabolic adaptations as a result of their cold, dark environment is not wholly supported by the current data.
机译：使用微光电二极管O-2研究了体温和脉络膜网状生长对主要温带大西洋鳕鱼Gadus morhua和仅格陵兰鳕鱼G. ogac的眼氧分压（PO2）的相互关系。传感器。由于地理分布的差异，据推测，G。ogac具有在寒冷，黑暗的环境中有利于视觉代谢过程的特征。物种之间眼睛的相对大小相同，并且显示出负的身体尺寸缩放比例。两种加迪亚物种的吸氧性都非常发达，尽管可变，但眼部PO2的记录始终一致且经常大大超过大气压（27.7-138.3 kPa）。脉络膜网状菌在G. ogac中稍发达，但在两个物种之间眼PO2没有显着差异。两种物种的脉络膜网状体发育均与体长成等轴测图，这也许可以解释为什么体长差异并未解释眼内PO2测量值的任何变化。极地鱼类物种由于其寒冷，黑暗的环境而表现出明显的视觉-代谢适应性这一假设并不能完全被当前数据所支持。

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