Coralline algae in a naturally acidified ecosystem persist by maintaining control of skeletal mineralogy and size.
Coralline algae in a naturally acidified ecosystem persist by maintaining control of skeletal mineralogy and size.
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DOI：
10.1098/rspb.2016.1159
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发表时间：
2016-10-12
期刊：
影响因子：
--
通讯作者：
Kroeker KJ
中科院分区：
文献类型：
--
作者：
Kamenos NA;Perna G;Gambi MC;Micheli F;Kroeker KJ
为了了解海洋酸化（OA）对海洋钙化物的影响，必须在生态系统环境中确定各个物种内不同亚致死反应之间的权衡以及这些权衡的紧急影响。壳珊瑚藻（CCA）提供了一个模型来测试这种亚致死效应的生态后果，因为它们对于生态系统功能、服务提供、碳循环以及利用溶解的无机碳进行钙化和光合作用非常重要。将沉降瓷砖在自然 CO2 排放口处置于环境 pH 值、低 pH 值和极低 pH 值条件下 14 个月。在贴片部署后 3.5、6.5 和 14 个月时评估 CCA 贴片的大小、镁 (Mg) 含量和分子尺度骨骼紊乱。尽管在低 pH 值下它们的丰度减少，但来自环境和低 pH 值区域的最大的 CCA 具有相似的大小，并且具有相似的镁含量和骨骼紊乱。这表明在低 pH 条件下最具弹性的 CCA 不会为了维持生长而牺牲骨骼结构。然而，在极低 pH 值下定居的 CCA 明显较小，并且表现出骨骼矿物学的改变（高镁方解石到石膏（水合硫酸钙）），尽管目前尚不清楚这些矿物学变化是否在极低 pH 值下提供任何健身益处。 OA 生物效应的现场评估提供了生成对钙化系统持久性的生态系统相关理解所需的终点信息。
To understand the effects of ocean acidification (OA) on marine calcifiers, the trade-offs among different sublethal responses within individual species and the emergent effects of these trade-offs must be determined in an ecosystem setting. Crustose coralline algae (CCA) provide a model to test the ecological consequences of such sublethal effects as they are important in ecosystem functioning, service provision, carbon cycling and use dissolved inorganic carbon to calcify and photosynthesize. Settlement tiles were placed in ambient pH, low pH and extremely low pH conditions for 14 months at a natural CO2 vent. The size, magnesium (Mg) content and molecular-scale skeletal disorder of CCA patches were assessed at 3.5, 6.5 and 14 months from tile deployment. Despite reductions in their abundance in low pH, the largest CCA from ambient and low pH zones were of similar sizes and had similar Mg content and skeletal disorder. This suggests that the most resilient CCA in low pH did not trade-off skeletal structure to maintain growth. CCA that settled in the extremely low pH, however, were significantly smaller and exhibited altered skeletal mineralogy (high Mg calcite to gypsum (hydrated calcium sulfate)), although at present it is unclear if these mineralogical changes offered any fitness benefits in extreme low pH. This field assessment of biological effects of OA provides endpoint information needed to generate an ecosystem relevant understanding of calcifying system persistence.
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