Production of 15N-depleted biomass during cyanobacterial N2-fixation at high Fe concentrations

Aubrey L. Zerkle, Christopher K. Junium, Donald Eugene Canfield, Christopher H. House

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Udgivelsesdato: 30.07
OriginalsprogEngelsk
TidsskriftJournal of Geophysical Research
Vol/bind113
Udgave nummerG3
ISSN2169-8953
DOI
StatusUdgivet - 30. jul. 2008

Fingeraftryk

biomass
fixation
Cyanobacteria
Biomass
Anabaena variabilis
organisms
cyanobacterium
anabaena
anoxia
hypoxia
biomass production
fractionation
nutrient dynamics
oceans
nutrients
organic matter
Fractionation
Phanerozoic
regeneration
Biological materials

Citer dette

@article{af3de700646f11ddb1a1000ea68e967b,
title = "Production of 15N-depleted biomass during cyanobacterial N2-fixation at high Fe concentrations",
abstract = "In this study we examine the effects of varying Fe, Mo, and P concentrations on δ15N fractionation during N2 fixation in the cyanobacterium Anabaena variabilis. We show that when grown in Fe‐enriched media ([Fe] ≥ 50 nM), this organism produces biomass up to 3‰ lower in δ15N than when grown in Fe‐limited media ([Fe] < 50 nM). A compilation of our data with previous measurements of δ15N in N2‐fixing cyanobacteria reveals a general trend toward the production of more 15N‐depleted biomass at higher Fe concentrations. We discuss our results in the context of negative δ15N values preserved in Archean and some Phanerozoic sediments, generally attributed to the production of marine organic matter with low δ15N by N2 fixation (and potentially NH4+ regeneration) during periods of fluctuating nutrient dynamics. We suggest that enhanced Fe availability during periods of widespread ocean anoxia can further stimulate the production of 15N‐depleted biomass by N2‐fixing organisms, contributing to the isotopic record.",
author = "Zerkle, {Aubrey L.} and Junium, {Christopher K.} and Canfield, {Donald Eugene} and House, {Christopher H.}",
year = "2008",
month = "7",
day = "30",
doi = "10.1029/2007JG000651",
language = "English",
volume = "113",
journal = "Journal of Geophysical Research",
issn = "2169-8953",
publisher = "American Geophysical Union",
number = "G3",

}

Production of 15N-depleted biomass during cyanobacterial N2-fixation at high Fe concentrations. / Zerkle, Aubrey L.; Junium, Christopher K.; Canfield, Donald Eugene; House, Christopher H.

I: Journal of Geophysical Research, Bind 113, Nr. G3, 30.07.2008.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Production of 15N-depleted biomass during cyanobacterial N2-fixation at high Fe concentrations

AU - Zerkle, Aubrey L.

AU - Junium, Christopher K.

AU - Canfield, Donald Eugene

AU - House, Christopher H.

PY - 2008/7/30

Y1 - 2008/7/30

N2 - In this study we examine the effects of varying Fe, Mo, and P concentrations on δ15N fractionation during N2 fixation in the cyanobacterium Anabaena variabilis. We show that when grown in Fe‐enriched media ([Fe] ≥ 50 nM), this organism produces biomass up to 3‰ lower in δ15N than when grown in Fe‐limited media ([Fe] < 50 nM). A compilation of our data with previous measurements of δ15N in N2‐fixing cyanobacteria reveals a general trend toward the production of more 15N‐depleted biomass at higher Fe concentrations. We discuss our results in the context of negative δ15N values preserved in Archean and some Phanerozoic sediments, generally attributed to the production of marine organic matter with low δ15N by N2 fixation (and potentially NH4+ regeneration) during periods of fluctuating nutrient dynamics. We suggest that enhanced Fe availability during periods of widespread ocean anoxia can further stimulate the production of 15N‐depleted biomass by N2‐fixing organisms, contributing to the isotopic record.

AB - In this study we examine the effects of varying Fe, Mo, and P concentrations on δ15N fractionation during N2 fixation in the cyanobacterium Anabaena variabilis. We show that when grown in Fe‐enriched media ([Fe] ≥ 50 nM), this organism produces biomass up to 3‰ lower in δ15N than when grown in Fe‐limited media ([Fe] < 50 nM). A compilation of our data with previous measurements of δ15N in N2‐fixing cyanobacteria reveals a general trend toward the production of more 15N‐depleted biomass at higher Fe concentrations. We discuss our results in the context of negative δ15N values preserved in Archean and some Phanerozoic sediments, generally attributed to the production of marine organic matter with low δ15N by N2 fixation (and potentially NH4+ regeneration) during periods of fluctuating nutrient dynamics. We suggest that enhanced Fe availability during periods of widespread ocean anoxia can further stimulate the production of 15N‐depleted biomass by N2‐fixing organisms, contributing to the isotopic record.

U2 - 10.1029/2007JG000651

DO - 10.1029/2007JG000651

M3 - Journal article

VL - 113

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

SN - 2169-8953

IS - G3

ER -