The Possession of Coccoliths Fails to Deter Microzooplankton Grazers
The Possession of Coccoliths Fails to Deter Microzooplankton Grazers
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DOI：
10.3389/fmars.2020.569896
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
K. Mayers;A. Poulton;K. Bidle;K. Thamatrakoln;B. Schieler;S. Giering;Seòna R Wells;G. Tarran
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文献类型：
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作者：
K. Mayers;A. Poulton;K. Bidle;K. Thamatrakoln;B. Schieler;S. Giering;Seòna R Wells;G. Tarran
浮游植物在调节全球碳和养分循环中发挥着核心作用，是海洋食物网的基础。一组生物地球化学上重要的浮游植物，球石藻，产生碳酸钙鳞片，被认为可以阻止或减少微型浮游动物的放牧。在这里，一项基于中海洋实验的荟萃分析表明，世界性球石藻（Emiliania huxleyi）的钙化未能阻止微型浮游动物的捕食。非钙化纳米真核生物和微真核生物的放牧生长比中值（0.56±0.40）差异不显著（分别为0.71±0.31和0.55±0.34）。此外，环境浓度对非钙化类群的优先放牧影响不大。这些结果有力地表明，拥有球石并不能有效地保护赫胥黎蛤免受浮游微动物的掠食。这种无差别的消耗影响了CaCO3在海洋中的溶解和命运，以及球岩石的演化。
Phytoplankton play a central role in the regulation of global carbon and nutrient cycles, forming the basis of the marine food webs. A group of biogeochemically important phytoplankton, the coccolithophores, produce calcium carbonate scales that have been hypothesized to deter or reduce grazing by microzooplankton. Here, a meta-analysis of mesocosm-based experiments demonstrates that calcification of the cosmopolitan coccolithophore, Emiliania huxleyi, fails to deter microzooplankton grazing. The median grazing to growth ratio for E. huxleyi (0.56 ± 0.40) was not significantly different among non-calcified nano- or picoeukaryotes (0.71 ± 0.31 and 0.55 ± 0.34, respectively). Additionally, the environmental concentration of E. huxleyi did not drive preferential grazing of non-calcified groups. These results strongly suggest that the possession of coccoliths does not provide E. huxleyi effective protection from microzooplankton grazing. Such indiscriminate consumption has implications for the dissolution and fate of CaCO3 in the ocean, and the evolution of coccoliths.