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Seasonal variation in the white muscle biochemical composition of deep-sea macrourids in the North-east Atlantic

机译：东北大西洋深海巨猿的白肌生化成分的季节性变化

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The foremost temporal signal to the deep benthos, where temperature and light conditions are relatively constant, is a seasonal pulse of organic carbon sinking from the photic layer. In the Porcupine Seabight region of the NE Atlantic this flux begins during late spring and early summer, although the timing and intensity of the peak varies annually. A rapid response to this nutrient input is most apparent amongst bacteria and benthic meiofauna which can directly utilize the carbon. The question remains as to whether the seasonal influx of carbon to the deep Atlantic may affect, and possibly entrain, aspects of the life cycles of generalist scavengers near the top of the trophic hierarchy, such as macrourid fish. Biochemical analyses of the white muscle of three macrourid species indicate a slight seasonal effect. White muscle protein content in Coryphaenoides rupestris is twofold higher in autumn than spring, RNA content and RNA to protein ratio increased in C. guentheri in autumn, and protein, RNA, and RNA to protein ratio all are higher during autumn than spring in shallow living C. armatus (2,500 m). Changes in RNA to protein ratio in the white muscle of C. armatus, relative to depth of capture, appear to reflect expected patterns in specific growth rate. Significantly higher RNA to protein ratios are apparent in shallow than deep living C. armatus in both seasons. There is no significant decline in white muscle protein content with depth of capture in these three taxonomically related species. Data were collected over several successive years and the possibility of interannual variability complicates the interpretation of seasonal patterns. Despite these limitations this study does indicate a slight seasonal difference in the growth rate of C. rupestris, C. guentheri and C. armatus in the deep Northeast Atlantic.
机译：在温度和光照条件相对恒定的深底栖生物最重要的时间信号是从光层下沉的有机碳的季节性脉冲。在东北大西洋的豪猪海域，这种通量在春季末和夏季初开始，尽管高峰的时间和强度每年都在变化。在可以直接利用碳的细菌和底栖动物中，对这种养分输入的快速响应最为明显。问题仍然是，季节性碳涌入大西洋深处是否会影响并可能带走营养级别最高的附近的通俗清除者（例如巨嘴鱼）的生命周期。对三种大果物种的白肌进行生化分析表明有轻微的季节性影响。秋季，东方红叶白肌肉的蛋白质含量比春季高出两倍，秋季金盏花的RNA含量和RNA /蛋白质比增加，秋季，浅层生活中的蛋白质，RNA和RNA /蛋白质比都比春季高。 C. armatus（2,500 m）。褐变线虫白色肌肉中RNA与蛋白质的比率相对于捕获深度的变化似乎反映了特定增长率的预期模式。在两个季节中，浅水区的深层虫比浅水区的深层虫明显具有更高的RNA与蛋白质比。在这三个分类学上相关的物种中，白肌蛋白质含量没有随捕获深度的显着下降。连续几年收集了数据，年际变化的可能性使季节性模式的解释变得复杂。尽管有这些局限性，本研究的确显示了东北大西洋深处的毛果隐孢子虫，根氏隐孢子虫和armatus隐孢子虫的生长率有轻微的季节性差异。

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