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Metabolic rate and genomic GC. What we can learn from teleost fish

机译：代谢率和基因组GC。我们可以从硬骨鱼中学到什么

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Teleosts are a highly diverse group of animals occupying all kind of aquatic environment. Data on routine mass specific metabolic rate were re-examined correcting them for the Boltzmann's factor. Teleostean fish were grouped in five broad groups, corresponding to major environmental classifications: polar, temperate, sub-tropical, tropical and deep-water. The specific routine metabolic rate, temperature-corrected using the Boltzmann's factor (MR), and the average base composition of genomes (GC%) were calculated in each group. Fish of the polar habitat showed the highest MR. Temperate fish displayed a significantly higher MR than tropical fish, which had the lowest average value. These results were apparently in agreement with the cold adaptation hypothesis. In contrast with this hypothesis, however, the MR of fish living in deep-water environment turned out to be not significantly different from that of fish living in tropical habitats. Most probably, the amount of oxygen dissolved in the water directly affects MR adaptation. Regarding the different habitats, the genomic GC levels showed a decreasing trend similar to that of MR. Indeed, both polar and temperate fish showed a GC level significantly higher than that of both sub-tropical and tropical fish. Plotting the genomic GC levels versus the MR a significant positive correlation was found, supporting the hypothesis that metabolic rate can explain not only the compositional transition mode (e.g. amphibian/ mammals), but also the compositional shifting mode (e.g. fish/fish) of evolution observed for vertebrate genomes.
机译：硬骨鱼类是一个高度多样化的动物群，它们占据着各种水生环境。重新检查了常规质量比代谢率的数据，将其校正为玻耳兹曼因子。硬骨鱼类分为五个大类，对应于主要的环境分类：极地，温带，亚热带，热带和深水。在每组中计算特定的常规代谢率，使用玻尔兹曼因子（MR）进行温度校正，并计算基因组的平均碱基组成（GC％）。极地栖息地的鱼类显示出最高的MR。温带鱼的MR值显着高于热带鱼，其平均值最低。这些结果显然与冷适应假说相符。然而，与该假设相反，生活在深水环境中的鱼类的MR与生活在热带栖息地的鱼类的MR并没有显着差异。最有可能的是，水中溶解的氧气量直接影响MR适应性。关于不同的生境，基因组GC水平显示出与MR相似的下降趋势。实际上，极地和温带鱼类的GC含量均显着高于亚热带和热带鱼类。绘制基因组GC水平与MR的显着正相关，支持以下假设：新陈代谢率不仅可以解释进化的组成转换模式（例如两栖动物/哺乳动物），而且可以解释进化的组成转换模式（例如鱼/鱼）观察脊椎动物基因组。

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