Evidence map›Paper›PMID 24972068›Full record

ArticleThe ISME journal2015

Iron deficiency increases growth and nitrogen-fixation rates of phosphorus-deficient marine cyanobacteria.

Nathan S Garcia, Feixue Fu, Peter N Sedwick, David A Hutchins

Open access · bronzeAbstract read
In one paragraph

Article in The ISME journal, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 22 papers.

0numbers the graph read from it
0cells of the map it votes in
22citing papers in PubMed
6.1field-weighted citation impact, top 4% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

22 citing papers in PubMed, 81 citations in OpenAlex.

  1. Article
  2. Article
  3. Phosphorus limitation heightens vulnerability ofFrontiers in microbiology · 2025
    Article
  4. Review
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  15. Article
  16. Microorganisms and ocean global change.Nature microbiology · 2017
    Review
  17. Article
  18. Article
  19. Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 2 institutions in 1 country.

Nathan S GarciaDepartment of Biological Sciences, Marine and Environmental Biology, University of Southern California, Los Angeles, CA, USA.
Feixue FuDepartment of Biological Sciences, Marine and Environmental Biology, University of Southern California, Los Angeles, CA, USA.
Peter N SedwickDepartment of Ocean, Earth and Atmospheric Sciences, College of Sciences, Old Dominion University, Norfolk, VA, USA.
David A HutchinsDepartment of Biological Sciences, Marine and Environmental Biology, University of Southern California, Los Angeles, CA, USA.
University of Southern California · USOld Dominion University · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Marine dinitrogen (N2)-fixing cyanobacteria have large impacts on global biogeochemistry as they fix carbon dioxide (CO2) and fertilize oligotrophic ocean waters with new nitrogen. Iron (Fe) and phosphorus (P) are the two most important limiting nutrients for marine biological N2 fixation, and their availabilities vary between major ocean basins and regions. A long-standing question concerns the ability of two globally dominant N2-fixing cyanobacteria, unicellular Crocosphaera and filamentous Trichodesmium, to maintain relatively high N2-fixation rates in these regimes where both Fe and P are typically scarce. We show that under P-deficient conditions, cultures of these two cyanobacteria are able to grow and fix N2 faster when Fe deficient than when Fe replete. In addition, growth affinities relative to P increase while minimum concentrations of P that support growth decrease at low Fe concentrations. In Crocosphaera, this effect is accompanied by a reduction in cell sizes and elemental quotas. Relatively high growth rates of these two biogeochemically critical cyanobacteria in low-P, low-Fe environments such as those that characterize much of the oligotrophic ocean challenge the common assumption that low Fe levels can have only negative effects on marine primary producers. The closely interdependent influence of Fe and P on N2-fixing cyanobacteria suggests that even subtle shifts in their supply ratio in the past, present and future oceans could have large consequences for global carbon and nitrogen cycles.

Indexed as

Nitrogen FixationWater MicrobiologyCyanobacteriaHumansIronNitrogenOceans and SeasPhosphorusSeawaterIronNitrogenPhosphorus

Identifiers

PMID24972068
PMCPMC4274416
OpenAlexW2057050801

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.