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首页> 美国卫生研究院文献>Scientific Reports >Surviving but not thriving: inconsistent responses of zooxanthellate jellyfish polyps to ocean warming and future UV-B scenarios
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Surviving but not thriving: inconsistent responses of zooxanthellate jellyfish polyps to ocean warming and future UV-B scenarios

机译：幸存但并非欣欣向荣：虫黄藻水母息肉对海洋变暖和未来UV-B情景的反应不一致

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Complex changes to UV radiation at the Earth’s surface are occurring concurrently with ocean warming. Despite few empirical tests, jellyfish are hypothesised to be increasing in some parts of the world because they are robust to environmental stressors. Here we examine the effects of UV-B and ocean warming projections on zooxanthellate jellyfish polyps. We exposed Cassiopea sp. polyps to three levels of UV-B (future-low (1.43 Wm2), current (1.60 Wm2), future-high (1.77 Wm2)) and two levels of temperature (current-day (25 °C) and future (28 °C)) over 6 weeks. The intensity of UV-B was varied throughout the day to mimic diel variation in UV-B irradiance. Polyp survival, asexual reproduction and YII were measured. In the current and future-high UV-B treatments, more polyps were produced in 25 °C than 28 °C. This pattern, however, was reversed under future-low UV-B conditions, where more polyps were produced at 28 °C. YII was highest under current summer conditions and future conditions of low UV-B and increased temperature. YII, however, was reduced under high UV-B conditions but was further reduced with warming. Our results suggest that although Cassiopea polyps may survive elevated UV-B and warming conditions, they are unlikely to thrive. If, however, UV-B radiation decreases then ocean warming may facilitate increases in Cassiopea populations.
机译：海洋变暖与地球表面紫外线辐射的复杂变化同时发生。尽管很少进行经验测试，但据推测在世界某些地区水母正在增加，因为它们对环境压力大。在这里，我们研究了紫外线-B和海洋变暖预测对黄藻类水母息肉的影响。我们暴露了Cassiopea sp。到三个级别的UV-B息肉（未来低（1.43 Wm 2 ），电流（1.60 Wm 2 ），未来高（1.77 Wm 2 < / sup>））和两个温度水平（当前（25°C）和将来（28°C））在6周内。 UV-B的强度全天变化，以模仿UV-B辐照度的diel变化。测量息肉存活率，无性繁殖和YII。在当前和未来的高UV-B处理中，在25°C时产生的息肉多于28°C。但是，这种模式在未来的低UV-B条件下被逆转，在28°C下会产生更多的息肉。在当前的夏季条件和紫外线-B低和温度升高的未来条件下，YII最高。但是，YII在高UV-B条件下会降低，但随着升温会进一步降低。我们的结果表明，尽管仙后座息肉可能在UV-B升高和气候变暖的条件下幸存，但它们不太可能to壮成长。但是，如果UV-B辐射减少，那么海洋变暖可能会促进卡西欧豌豆种群的增加。

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