DOI: 10.1002/2015GB005273
Scopus记录号: 2-s2.0-84959432688
论文题名: Microzooplankton regulation of surface ocean POC:PON ratios
作者: Talmy D ; , Martiny A ; C ; , Hill C ; , Hickman A ; E ; , Follows M ; J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 2 起始页码: 311
结束页码: 332
语种: 英语
英文关键词: biological carbon pump
; ecosystem model
; microzooplankton
; phytoplankton
; redfield
; stoichiometry
Scopus关键词: autotrophy
; biological pump
; carbohydrate
; ecosystem modeling
; heterotrophy
; laboratory method
; lipid
; nutrient
; particulate organic matter
; physiological response
; phytoplankton
; primary production
; Redfield ratio
; respiration
; stoichiometry
; zooplankton
; Atlantic Ocean
; Atlantic Ocean (Northwest)
英文摘要: The elemental composition of particulate organic matter in the surface ocean significantly affects the efficiency of the ocean's store of carbon. Though the elemental composition of primary producers is an important factor, recent observations from the western North Atlantic Ocean revealed that carbon-to-nitrogen ratios (C:N) of phytoplankton were significantly higher than the relatively homeostatic ratio of the total particulate pool (particulate organic carbon:particulate organic nitrogen; POC:PON). Here we use an idealized ecosystem model to show how interactions between primary and secondary producers maintain the mean composition of surface particulates and the difference between primary producers and bulk material. Idealized physiological models of phytoplankton and microzooplankton, constrained by laboratory data, reveal contrasting autotrophic and heterotrophic responses to nitrogen limitation: under nitrogen limitation, phytoplankton accumulate carbon in carbohydrates and lipids while microzooplankton deplete internal C reserves to fuel respiration. Global ecosystem simulations yield hypothetical global distributions of phytoplankton and microzooplankton C:N ratio predicting elevated phytoplankton C:N ratios in the high-light, low-nutrient regions of the ocean despite a lower, homeostatic POC:PON ratio due to respiration of excess carbon in systems subject to top-down control. The model qualitatively captures and provides a simple interpretation for, a global compilation of surface ocean POC:PON data. ©2016. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77887
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth, Atmosphere and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Departments of Earth System Science and Ecology and Evolutionary Biology, University of California, Irvine, CA, United States; Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton, Southampton, United Kingdom
Recommended Citation:
Talmy D,, Martiny A,C,et al. Microzooplankton regulation of surface ocean POC:PON ratios[J]. Global Biogeochemical Cycles,2016-01-01,30(2)