Varying influence of phytoplankton biodiversity and stoichiometric plasticity on bulk particulate stoichiometry across ocean basins
Varying influence of phytoplankton biodiversity and stoichiometric plasticity on bulk particulate stoichiometry across ocean basins
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DOI：
10.1038/s43247-021-00212-9
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发表时间：
2021-07-14
影响因子：
7.9
通讯作者：
Martiny, Adam C.
中科院分区：
文献类型：
--
作者：
Lomas, Michael W.;Baer, Steven E.;Martiny, Adam C.
悬浮颗粒有机物的浓度和元素比例影响海洋中的许多生物地球化学过程，包括浮游植物营养限制的模式以及碳、氮和磷循环之间的联系。在这里，我们提出了直接测量的细胞营养含量和化学计量比离散浮游植物种群跨越广泛的环境条件在几个海洋盆地。中值细胞的碳-磷和氮-磷比呈正相关，垂直硝酸盐-磷酸盐通量的所有浮游植物组，并始终高于蓝藻比真核生物。光和温度是不一致的化学计量比的预测。在北大西洋营养丰富和磷胁迫的生物群落，但不是在氮胁迫的热带北太平洋，我们发现，分类组成和环境驯化的组合最好的预测散装颗粒有机物组成。我们的研究结果表明，浮游生物的生物多样性和可塑性在控制海洋营养盐和碳循环之间的联系在某些regions.Phytoplankton生物多样性和细胞驯化垂直营养盐通量比控制颗粒化学计量在北大西洋的核心作用，根据现场观测的细胞元素化学计量在分类群体和海洋盆地。
Concentrations and elemental ratios of suspended particulate organic matter influence many biogeochemical processes in the ocean, including patterns of phytoplankton nutrient limitation and links between carbon, nitrogen and phosphorus cycles. Here we present direct measurements of cellular nutrient content and stoichiometric ratios for discrete phytoplankton populations spanning broad environmental conditions across several ocean basins. Median cellular carbon-to-phosphorus and nitrogen-to-phosphorus ratios were positively correlated with vertical nitrate-to-phosphate flux for all phytoplankton groups and were consistently higher for cyanobacteria than eukaryotes. Light and temperature were inconsistent predictors of stoichiometric ratios. Across nutrient-rich and phosphorus-stressed biomes in the North Atlantic, but not in the nitrogen-stressed tropical North Pacific, we find that a combination of taxonomic composition and environmental acclimation best predict bulk particulate organic matter composition. Our findings demonstrate the central role of plankton biodiversity and plasticity in controlling linkages between ocean nutrient and carbon cycles in some regions.Phytoplankton biodiversity and cellular acclimation to vertical nutrient flux ratio control particulate stoichiometry in the North Atlantic, according to field observations of cellular elemental stoichiometry across taxonomic groups and ocean basins.