Phase heterogeneity in carbonate production by marine fish influences their roles in sediment generation and the inorganic carbon cycle.
Phase heterogeneity in carbonate production by marine fish influences their roles in sediment generation and the inorganic carbon cycle.
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DOI：
10.1038/s41598-017-00787-4
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发表时间：
2017-04-10
影响因子：
4.6
通讯作者：
Wilson RW
中科院分区：
文献类型：
--
作者：
Salter MA;Harborne AR;Perry CT;Wilson RW
海洋硬骨鱼是浅海和海洋环境中重要的碳酸盐生产者。然而，它们产生的不同碳酸盐相（即碳酸钙的矿物和无定形形式）的命运，以及它们在沉积物产生和海洋无机碳循环中的作用，仍然知之甚少。在这里，我们量化了 22 种巴哈马鱼类产生的碳酸盐相，并将这些数据与巴哈马的区域鱼类生物量数据相整合，以生成解决这些相的新型平台规模生产模型。总体碳酸盐相比例（按相稳定性降低排序）为：约 20% 方解石、约 6% 文石、约 60% 高镁方解石和约 14% 无定形碳酸盐。我们预测这些相会经历不同的命运，至少~14%（无定形碳酸盐）可能会迅速溶解。结果进一步表明，巴哈马的渔业开发可能使某些栖息地的鱼类碳酸盐产量减少高达 58%，同时也导致自然相比例的偏差。这些发现对于了解浅层温水碳酸盐区的沉积过程具有明显的意义。我们进一步推测，显着的相异质性可能是各种浅海和海洋环境中鱼类碳酸盐迄今为止未被认识的特征，这对于了解它们在全球海洋无机碳循环中的作用具有潜在的重大影响。
Marine teleost fish are important carbonate producers in neritic and oceanic settings. However, the fates of the diverse carbonate phases (i.e., mineral and amorphous forms of CaCO3) they produce, and their roles in sediment production and marine inorganic carbon cycling, remain poorly understood. Here we quantify the carbonate phases produced by 22 Bahamian fish species and integrate these data with regional fish biomass data from The Bahamas to generate a novel platform-scale production model that resolves these phases. Overall carbonate phase proportions, ordered by decreasing phase stability, are: ~20% calcite, ~6% aragonite, ~60% high-Mg calcite, and ~14% amorphous carbonate. We predict that these phases undergo differing fates, with at least ~14% (amorphous carbonate) likely dissolving rapidly. Results further indicate that fisheries exploitation in The Bahamas has potentially reduced fish carbonate production by up to 58% in certain habitats, whilst also driving a deviation from natural phase proportions. These findings have evident implications for understanding sedimentary processes in shallow warm-water carbonate provinces. We further speculate that marked phase heterogeneity may be a hitherto unrecognised feature of fish carbonates across a wide range of neritic and oceanic settings, with potentially major implications for understanding their role in global marine inorganic carbon cycling.