Nitrogen Sources for Phytoplankton in the Eastern Indian Ocean Determined From δ15N of Chlorophyll a and Divinylchlorophyll a

被引:10
作者
Isaji, Yuta [1 ]
Yoshikawa, C. [1 ]
Ogawa, N. O. [1 ]
Matsumoto, K. [2 ]
Makabe, A. [3 ]
Toyoda, S. [4 ]
Ishikawa, N. F. [1 ]
Ogawa, H. [5 ]
Saito, H. [5 ]
Honda, M. C. [2 ]
Ohkouchi, N. [1 ]
机构
[1] Japan Agcy Marine Earth Sci & Technol JAMSTEC, Biogeochem Res Ctr, Yokosuka, Kanagawa, Japan
[2] JAMSTEC, Surface Syst Res Ctr, Yokosuka, Kanagawa, Japan
[3] JAMSTEC, Inst Extra Cutting Edge Sci & Technol Avant Garde, Yokosuka, Kanagawa, Japan
[4] Tokyo Inst Technol, Sch Mat & Chem Technol, Yokohama, Kanagawa, Japan
[5] Univ Tokyo, Atmosphere & Ocean Res Inst, Kashiwa, Chiba, Japan
基金
日本学术振兴会;
关键词
nitrogen isotope; chlorophyll; divinylchlorophyll; Prochlorococcus; Indian Ocean; primary production; MARINE CYANOBACTERIA PROCHLOROCOCCUS; FALL MIXED-LAYER; ISOTOPE FRACTIONATION; AMMONIUM ASSIMILATION; NITRATE ASSIMILATION; ORGANIC NITROGEN; CARBON; BAY; BENGAL; NITRITE;
D O I
10.1029/2021GC010057
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Nitrogen isotope analysis of chloropigments provides information on the sources of nitrogenous nutrients assimilated by phytoplankton. The abundant, ubiquitous chlorophyll a records nitrogen isotopic compositions (delta N-15) of eukaryotic phytoplankton and cyanobacteria, whereas more source-specific chloropigments, such as the divinylchlorophylls exclusively possessed by the marine picocyanobacterium Prochlorococcus, can potentially resolve isotopic variability within the phytoplankton community. In this study, we analyzed the delta N-15 of both chlorophyll a and divinylchlorophyll a isolated from suspended particulate material collected at the subsurface chlorophyll maximum (SCM) along a meridional transect at 88 degrees E in the oligotrophic eastern Indian Ocean. The nitrogen isotopic compositions of Prochlorococcus (delta N-15(PRO)) and the combined biomass of eukaryotic phytoplankton and Synechococcus (delta N-15(EU+SYN)) estimated from the delta N-15 of divinylchlorophyll a and chlorophyll a, respectively, revealed systematic variations that were not apparent from bulk isotope measurements. Whereas consistently low delta N-15(PRO) indicated reliance of Prochlorococcus on regenerated nitrogen throughout the transect, elevation in delta N-15(EU+SYN) values at several stations was interpreted to reflect assimilation of subsurface NO3- by eukaryotic phytoplankton. The delta N-15 distributions revealed subtle differences in NO3- availability at the SCM along the transect, which were consistently explained by the occurrence of mesoscale eddies in the Bay of Bengal, deepening of the mixed layer induced by a seasonal Wyrtki Jet in the equatorial region, and substantial deepening of the nutricline in the South Indian Ocean gyre. Our results highlight the utility of compound-specific isotopic measurements of multiple species of chlorophylls in obtaining essential non-incubation-based biogeochemical constraints on the primary production in the ocean.
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页数:18
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共 104 条
  • [1] Nitrogen assimilation in picocyanobacteria inhabiting the oxygen-deficient waters of the eastern tropical North and South Pacific
    Aldunate, Montserrat
    Henriquez-Castillo, Carlos
    Ji, Qixing
    Lueders-Dumont, Jessica
    Mulholland, Margaret R.
    Ward, Bess B.
    von Dassow, Peter
    Ulloa, Osvaldo
    [J]. LIMNOLOGY AND OCEANOGRAPHY, 2020, 65 (02) : 437 - 453
  • [2] SEASONAL AND DEPTH-RELATED CHANGES IN THE SOURCE OF SINKING PARTICLES IN THE NORTH-ATLANTIC
    ALTABET, MA
    DEUSER, WG
    HONJO, S
    STIENEN, C
    [J]. NATURE, 1991, 354 (6349) : 136 - 139
  • [3] SEDIMENTARY NITROGEN ISOTOPIC RATIO AS A RECORDER FOR SURFACE OCEAN NITRATE UTILIZATION
    ALTABET, MA
    FRANCOIS, R
    [J]. GLOBAL BIOGEOCHEMICAL CYCLES, 1994, 8 (01) : 103 - 116
  • [4] VARIATIONS IN NITROGEN ISOTOPIC COMPOSITION BETWEEN SINKING AND SUSPENDED PARTICLES - IMPLICATIONS FOR NITROGEN CYCLING AND PARTICLE TRANSFORMATION IN THE OPEN OCEAN
    ALTABET, MA
    [J]. DEEP-SEA RESEARCH PART A-OCEANOGRAPHIC RESEARCH PAPERS, 1988, 35 (04): : 535 - 554
  • [5] Aoyama M., 2018, 12018 IOCCP
  • [6] Carbon and nitrogen productivity during spring in the oligotrophic Indian Ocean along the GO-SHIP IO9N transect
    Baer, Steven E.
    Rauschenberg, Sara
    Garcia, Catherine A.
    Garcia, Nathan S.
    Martiny, Adam C.
    Twining, Benjamin S.
    Lomas, Michael W.
    [J]. DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 2019, 161 : 81 - 91
  • [7] Photosynthetic rates derived from satellite-based chlorophyll concentration
    Behrenfeld, MJ
    Falkowski, PG
    [J]. LIMNOLOGY AND OCEANOGRAPHY, 1997, 42 (01) : 1 - 20
  • [8] Iron-stimulated changes in 13C fractionation and export by equatorial Pacific phytoplankton:: Toward a paleogrowth rate proxy
    Bidigare, RR
    Hanson, KL
    Buesseler, KO
    Wakeham, SG
    Freeman, KH
    Pancost, RD
    Millero, FJ
    Steinberg, P
    Popp, BN
    Latasa, M
    Landry, MR
    Laws, EA
    [J]. PALEOCEANOGRAPHY, 1999, 14 (05): : 589 - 595
  • [9] Consistent fractionation of C-13 in nature and in the laboratory: Growth-rate effects in some haptophyte algae
    Bidigare, RR
    Fluegge, A
    Freeman, KH
    Hanson, KL
    Hayes, JM
    Hollander, D
    Jasper, JP
    King, LL
    Laws, EA
    Milder, J
    Millero, FJ
    Pancost, R
    Popp, BN
    Steinberg, PA
    Wakeham, SG
    [J]. GLOBAL BIOGEOCHEMICAL CYCLES, 1997, 11 (02) : 279 - 292
  • [10] Prochlorococcus: the structure and function of collective diversity
    Biller, Steven J.
    Berube, Paul M.
    Lindell, Debbie
    Chisholm, Sallie W.
    [J]. NATURE REVIEWS MICROBIOLOGY, 2015, 13 (01) : 13 - 27