气候变化领域集成服务门户(CCPortal): Nitrogen and Isotope Flows Through the Costa Rica Dome Upwelling Ecosystem: The Crucial Mesozooplankton Role in Export Flux

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DOI	10.1029/2018GB005968
	Nitrogen and Isotope Flows Through the Costa Rica Dome Upwelling Ecosystem: The Crucial Mesozooplankton Role in Export Flux
	Stukel M.R.; Décima M.; Landry M.R.; Selph K.E.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1815
结束页码	1832
卷号	32 期号:12
英文摘要	The Costa Rica Dome (CRD) is an open-ocean upwelling ecosystem, with high biomasses of picophytoplankton (especially Synechococcus), mesozooplankton, and higher trophic levels. To elucidate the food web pathways supporting the trophic structure and carbon export in this unique ecosystem, we used Markov Chain Monte Carlo techniques to assimilate data from four independent realizations of δ 15 N and planktonic rate measurements from the CRD into steady state, multicompartment ecosystem box models (linear inverse models). Model results present well-constrained snapshots of ecosystem nitrogen and stable isotope fluxes. New production is supported by upwelled nitrate, not nitrogen fixation. Protistivory (rather than herbivory) was the most important feeding mode for mesozooplankton, which rely heavily on microzooplankton prey. Mesozooplankton play a central role in vertical nitrogen export, primarily through active transport of nitrogen consumed in the surface layer and excreted at depth, which comprised an average 36–46% of total export. Detritus or aggregate feeding is also an important mode of resource acquisition by mesozooplankton and regeneration of nutrients within the euphotic zone. As a consequence, the ratio of passively sinking particle export to phytoplankton production is very low in the CRD. Comparisons to similar models constrained with data from the nearby equatorial Pacific demonstrate that the dominant role of vertical migrators to the biological pump is a unique feature of the CRD. However, both regions show efficient nitrogen transfer from mesozooplankton to higher trophic levels (as expected for regions with large fish, cetacean, and seabird populations) despite the dominance of protists as major grazers of phytoplankton. ©2018. The Authors.
英文关键词	biological carbon pump; crustaceans; diel vertical migration; linear inverse ecosystem model; nitrogen cycle; nitrogen isotopes
语种	英语
scopus关键词	biological pump; carbon flux; crustacean; ecosystem modeling; euphotic zone; flux measurement; food web; nitrogen isotope; open ocean; trophic structure; upwelling; zooplankton; Pacific Ocean; Pacific Ocean (Equatorial); Cetacea; Costa (ostracode); Crustacea; Protista; Synechococcus
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129766
作者单位	Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Center for Ocean-Atmospheric Prediction Studies, Florida State University, Tallahassee, FL, United States; National Institute of Water and Atmospheric Research, Wellington, New Zealand; Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; Department of Oceanography, University of Hawaii at Mānoa, Honolulu, HI, United States
推荐引用方式 GB/T 7714	Stukel M.R.,Décima M.,Landry M.R.,et al. Nitrogen and Isotope Flows Through the Costa Rica Dome Upwelling Ecosystem: The Crucial Mesozooplankton Role in Export Flux[J],2018,32(12).
APA	Stukel M.R.,Décima M.,Landry M.R.,&Selph K.E..(2018).Nitrogen and Isotope Flows Through the Costa Rica Dome Upwelling Ecosystem: The Crucial Mesozooplankton Role in Export Flux.Global Biogeochemical Cycles,32(12).
MLA	Stukel M.R.,et al."Nitrogen and Isotope Flows Through the Costa Rica Dome Upwelling Ecosystem: The Crucial Mesozooplankton Role in Export Flux".Global Biogeochemical Cycles 32.12(2018).