Macroalgae may mitigate ocean acidification effects on mussel calcification by increasing pH and its fluctuations
Macroalgae may mitigate ocean acidification effects on mussel calcification by increasing pH and its fluctuations
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DOI：
10.1002/lno.10608
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发表时间：
2018-01
影响因子：
4.5
通讯作者：
Martin Wahl;Sabrina Schneider Covachã;V. Saderne;C. Hiebenthal;Jens Müller;C. Pansch;Y. Sawall
中科院分区：
文献类型：
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作者：
Martin Wahl;Sabrina Schneider Covachã;V. Saderne;C. Hiebenthal;Jens Müller;C. Pansch;Y. Sawall
海洋酸化通常被认为会对海洋生物的钙化率产生负面影响。然而，在局部范围内，大型植物的生物活动可能会产生pH值波动，其变化率比预测的开放海洋长期趋势大几个数量级。这些波动可能反过来影响附近的底栖钙化物。结合实验室，围隔和实地研究，OA，棕色的墨角藻vesiculosus，海草Zostera marina和蓝色贻贝贻贝之间的相互作用进行了研究，在波罗的海西部的空间尺度从分米到100米。相对于无水生植物但在其他方面相似的栖息地，水生植物使栖息地的总体平均pH值增加了0.3个单位，并施加了昼夜pH值波动，幅度从0.3到1个以上pH值单位。这些幅度和它们对贻贝钙化的影响往往会增加与大型植物生物量散装水的比例。在实验室和围隔尺度，生物pH值的波动允许贻贝保持钙化，即使在酸化条件下转移到白天的大部分钙化活动时，由大型植物活动引起的生物波动提供暂时避难OA应力。在生物量与水体比例较低的自然生境中，生物源pH波动对M. edulis不太明显。因此，在密集的藻类或海草栖息地，大型植物可能会减轻OA对贻贝钙化的影响，提高平均pH值和提供暂时的避难所，从酸化应力。
Ocean acidification (OA) is generally assumed to negatively impact calcification rates of marine organisms. At a local scale however, biological activity of macrophytes may generate pH fluctuations with rates of change that are orders of magnitude larger than the long‐term trend predicted for the open ocean. These fluctuations may in turn impact benthic calcifiers in the vicinity. Combining laboratory, mesocosm and field studies, such interactions between OA, the brown alga Fucus vesiculosus, the sea grass Zostera marina and the blue mussel Mytilus edulis were investigated at spatial scales from decimetres to 100s of meters in the western Baltic. Macrophytes increased the overall mean pH of the habitat by up to 0.3 units relative to macrophyte‐free, but otherwise similar, habitats and imposed diurnal pH fluctuations with amplitudes ranging from 0.3 to more than 1 pH unit. These amplitudes and their impact on mussel calcification tended to increase with increasing macrophyte biomass to bulk water ratio. At the laboratory and mesocosm scales, biogenic pH fluctuations allowed mussels to maintain calcification even under acidified conditions by shifting most of their calcification activity into the daytime when biogenic fluctuations caused by macrophyte activity offered temporal refuge from OA stress. In natural habitats with a low biomass to water body ratio, the impact of biogenic pH fluctuations on mean calcification rates of M. edulis was less pronounced. Thus, in dense algae or seagrass habitats, macrophytes may mitigate OA impact on mussel calcification by raising mean pH and providing temporal refuge from acidification stress.