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鱼类是否会因为酸性更强的海洋而失去嗅觉?

cnBeta.COM 2018-07-26

  几年前,英国埃克塞特大学进行的一项研究表明,海洋酸性的逐渐增强正在损害鱼类的嗅觉。新的研究现在强化了这一发现,这可能意味着海洋生态系统将出现问题。海水从大气中吸收二氧化碳(CO2)后开始变得更酸。

  因此,随着大气中二氧化碳浓度的升高,地球海洋的酸化程度也会上升 - 这已经比工业革命时期高出43%,到本世纪末预计将比现在高出2.5倍。

  不幸的是,似乎这种上升的酸度会损害鱼类检测气味的能力。这反过来又使它们更难找到食物,躲避掠食者或找到合适的产卵区域。该研究首席科学家Cosima Porteus博士表示:“首先,我们比较了当今海洋环境以及本世纪末预测的那些典型的二氧化碳水平对幼鲈行为的影响。酸性水域中的鲈鱼游得更少,当它们闻到掠食者的气味时,它们不太可能做出反应。”

  此外,科学家记录了动物神经系统的电活动,因为它们的嗅觉器官受到吸收不同二氧化碳水平的海水的影响。“如果在本世纪末海水被预测的二氧化碳酸化,海鲈的嗅觉将损失一半”Porteus表示。“它们检测和应对与食物和威胁情况相关的一些气味的能力受到的影响更大。我们认为这可以通过酸化海水来解释气味分子如何与鱼类的嗅觉受体结合,从而减少它们可以区分这些重要刺激的效果。“研究人员还指出,鱼类嗅觉器官和大脑中的气味感应/加工基因的表达减少。

  一篇关于这项研究的论文最近在《自然•气候变化》杂志上发表。

责任编辑:sun

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