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首页> 外文期刊>Marine biology >Cytherella as a tool to reconstruct deep-sea paleo-oxygen levels: the respiratory physiology of the platycopid ostracod Cytherella cf. abyssorum
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Cytherella as a tool to reconstruct deep-sea paleo-oxygen levels: the respiratory physiology of the platycopid ostracod Cytherella cf. abyssorum

机译：小球藻作为一种重建深海古氧气水平的工具：桔梗类成龙的呼吸生理学深渊

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摘要

The reconstruction of past climates is a major challenge. One approach is the use of paleoceanography, which looks for clues to the past activity of deep-sea currents by associating them with the melting of the poles. In different sampling zones, fossil biomarkers are used to reconstruct the oxygenation levels of the sea bottom. Among the ostracods (crustaceans), the family Cytherellidae is considered to be resistant to significant decreases in oxygen and their fossil valves are used as biomarkers for oxygenation levels in the past. We studied the basic principles behind Cytherella cf. abyssorum's ability to adapt to variations in water oxygenation levels in an attempt to determine what could differentiate it from other ostracods. Cytherella cf. abyssorum Sars 1866 has an activity level and ventilatory frequency only half that of ostracods studied previously. When subjected to a decrease in oxygenation, it demonstrates the beginnings of ventilatory adaptation which is unknown in the other studied ostracods. Some morpho-functional aspects are also remarkable, such as the presence of thick valves, which can close hermetically by means of powerful adductor muscles. Compared with already studied ostracods, Cytherella cf. abyssorum has, therefore, characteristics which suggest an ability to present increased resistance in hypoxia. We discuss these results in the paleoceanographical context by describing a scenario suggesting why an increased proportion of the ostracod population could indicate the existence of ocean bottoms with low oxygenation.
机译：过去气候的重建是一项重大挑战。一种方法是使用古海洋学，该方法通过将洋流与两极的融化联系起来，寻找有关深海洋流过去活动的线索。在不同的采样区中，使用化石生物标记物来重建海底的氧化水平。在the类（甲壳类动物）中，Cytherellidae科被认为可以抵抗氧气的大量减少，过去它们的化石阀门被用作氧合水平的生物标记。我们研究了Cytherella cf背后的基本原理。 abyssorum能够适应水氧合水平的变化，以试图确定其与其他兽类有何区别。小球藻比照。 abyssorum Sars 1866的活动水平和换气频率仅为以前研究的成龙的一半。当氧合作用减少时，它表明了通气适应的开始，这在其他研究的成龙类中是未知的。一些形态功能方面也很出色，例如存在厚的瓣膜，可以通过强大的内收肌将其气密关闭。与已经研究过的兽类相比，小球藻比照。因此，深渊具有暗示在缺氧中表现出增加抗性的能力的特征。我们在古海洋学背景下讨论了这些结果，并描述了一个场景，该场景表明了为什么为什么按比例增加的成龙类种群可能表明存在低氧合的海底。

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