Diel and tidal pCO2 x O2 fluctuations provide physiological refuge to early life stages of a coastal forage fish
Diel and tidal pCO2 x O2 fluctuations provide physiological refuge to early life stages of a coastal forage fish
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DOI：
10.1038/s41598-019-53930-8
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发表时间：
2019-12-03
影响因子：
4.6
通讯作者：
Baumann, Hannes
中科院分区：
文献类型：
--
作者：
Cross, Emma L.;Murray, Christopher S.;Baumann, Hannes
沿海生态系统在昼夜、潮汐、季节和年际时间尺度上的 pCO(2) 和溶解氧 (DO) 条件会经历显着的自然波动。二氧化碳排放量的增加和人为养分输入预计会增加这些 pCO(2) 和 DO 循环的酸化和缺氧的严重程度和持续时间。沿海海洋生物如何应对自然 pCO(2) x DO 变化和未来气候变化仍然很大程度上未知。在这里，我们评估了不同强度和频率的静态和循环 pCO(2) x DO 条件对重要沿海饲料鱼 Menidia menidia 早期生存和生长的影响。静态低溶解氧条件严重降低了胚胎存活率、幼体存活率、50%孵化时间、孵化时大小和幼体生长率。静态升高的 pCO(2) 不会影响大多数反应性状，但是，在缺氧条件下 (3.0 mg L-1)，确实会对胚胎存活产生协同负面影响。然而，循环 pCO(2) x DO 减少了静态条件对所有反应特征的负面影响，波动幅度影响了这种减少的程度。这表明 pCO(2) 和 DO 的波动可能通过提供周期性的生理避难所来缓解压力条件，从而使沿海生物受益，从而促进物种对气候变化的适应。
Coastal ecosystems experience substantial natural fluctuations in pCO(2) and dissolved oxygen (DO) conditions on diel, tidal, seasonal and interannual timescales. Rising carbon dioxide emissions and anthropogenic nutrient input are expected to increase these pCO(2) and DO cycles in severity and duration of acidification and hypoxia. How coastal marine organisms respond to natural pCO(2) x DO variability and future climate change remains largely unknown. Here, we assess the impact of static and cycling pCO(2) x DO conditions of various magnitudes and frequencies on early life survival and growth of an important coastal forage fish, Menidia menidia. Static low DO conditions severely decreased embryo survival, larval survival, time to 50% hatch, size at hatch and post-larval growth rates. Static elevated pCO(2) did not affect most response traits, however, a synergistic negative effect did occur on embryo survival under hypoxic conditions (3.0 mg L-1). Cycling pCO(2) x DO, however, reduced these negative effects of static conditions on all response traits with the magnitude of fluctuations influencing the extent of this reduction. This indicates that fluctuations in pCO(2) and DO may benefit coastal organisms by providing periodic physiological refuge from stressful conditions, which could promote species adaptability to climate change.