Latitudinal patterns in ocean C:N:P reflect phytoplankton acclimation and macromolecular composition

有一固定的比值 浮游植物 微粒 横断面 浮游生物 适应 亚热带 作文(语言) 营养物 环境化学 海洋学 生态学 化学 生物 环境科学 地质学 语言学 哲学
作者
Justin D. Liefer,Angelicque White,Zoe V. Finkel,Andrew J. Irwin,Mathilde Dugenne,Keisuke Inomura,François Ribalet,E. Virginia Armbrust,David M. Karl,Matthew H. Fyfe,Christopher M. Brown,Michael J. Follows
出处
期刊:Proceedings of the National Academy of Sciences of the United States of America [Proceedings of the National Academy of Sciences]
卷期号:121 (46)
标识
DOI:10.1073/pnas.2404460121
摘要

The proportions of carbon (C), nitrogen (N), and phosphorus (P) in surface ocean particulate matter deviate greatly from the canonical Redfield Ratio (C:N:P = 106:16:1) in space and time with significant implications for global carbon storage as this matter reaches the deep ocean. Recent work has revealed clear latitudinal patterns in C:N:P, yet the relative importance of ecological, physiological, or biochemical processes in creating these patterns is unclear. We present high-resolution, concurrent measurements of particulate C:N:P, macromolecular composition, environmental conditions, and plankton community composition from a transect spanning a subtropical-subpolar boundary, the North Pacific Transition Zone. We find that the summed contribution of macromolecules to particulate C, N, and P is consistent with, and provides interpretation for, particulate C:N:P patterns. A decline in particulate C:N from the subtropical to subpolar North Pacific largely reflects an increase in the relative contribution of protein compared to carbohydrate and lipid, whereas variation in C:P and N:P correspond to shifts in protein relative to polyphosphate, DNA, and RNA. Possible causes for the corresponding trends in C:N and macromolecular composition include physiological responses and changes in community structure of phytoplankton, which represented approximately 1/3 rd of particulate C across the transect. Comparison with culture experiments and an allocation-based model of phytoplankton macromolecular composition suggest that physiological acclimation to changing nutrient supply is the most likely explanation for the latitudinal trend in C:N, offering both a mechanistic interpretation and biochemical basis for large-scale patterns in C:N:P.
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