Massive outbreaks of Noctiluca scintillans blooms in the Arabian Sea due to spread of hypoxia
Massive outbreaks of Noctiluca scintillans blooms in the Arabian Sea due to spread of hypoxia
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DOI：
10.1038/ncomms5862
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发表时间：
2014-09-01
影响因子：
16.6
通讯作者：
Thoppil, Prasad
中科院分区：
文献类型：
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作者：
Gomes, Helga do Rosario;Goes, Joaquim I.;Thoppil, Prasad
在过去十年中，北方阿拉伯海的冬季浮游植物水华的组成发生了根本性的变化，以前主要由硅藻组成，硅藻是一种单细胞的硅质光合生物，因对流混合而受到营养丰富的沃茨的青睐。这些具有重要营养价值的硅藻水华已被一种大型绿色甲藻夜光藻的广泛水华所取代，夜光藻结合了其含叶绿素内共生体的碳固定和捕食。在这里，我们报告说，这些大规模爆发的N。在冬季的浮游植物是由一个前所未有的缺氧沃茨流入真光层，并通过其内共生体Pedinomonasacettilucae的非凡能力，以固定碳比其他浮游植物在缺氧条件下更有效地促进。我们认为N.珊瑚虫的大量繁殖可能会破坏传统的由珊瑚虫维持的食物链，损害区域渔业和支持近1.2亿沿海人口的生态系统的长期健康。
In the last decade, the northern Arabian Sea has witnessed a radical shift in the composition of winter phytoplankton blooms, which previously comprised mainly of diatoms, the unicellular, siliceous photosynthetic organisms favoured by nutrient-enriched waters from convective mixing. These trophically important diatom blooms have been replaced by widespread blooms of a large, green dinoflagellate, Noctiluca scintillans, which combines carbon fixation from its chlorophyll-containing endosymbiont with ingestion of prey. Here, we report that these massive outbreaks of N. scintillans during winter are being facilitated by an unprecedented influx of oxygen deficient waters into the euphotic zone and by the extraordinary ability of its endosymbiont Pedinomonas noctilucae to fix carbon more efficiently than other phytoplankton under hypoxic conditions. We contend that N. scintillans blooms could disrupt the traditional diatom-sustained food chain to the detriment of regional fisheries and long-term health of an ecosystem supporting a coastal population of nearly 120 million people.