World's Best Scientists 2026 revealed!

D-Index & Metrics

Environmental Sciences

D-Index
56
Citations
8503
World Ranking
3740
National Ranking
1426

Tracy A. Villareal publication distribution in Environmental Sciences in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Environmental Sciences in 2026. The highlighted bar marks where Tracy A. Villareal sits on this spectrum.

41–50 publications: 21 scientists 51–60 publications: 62 scientists 61–70 publications: 133 scientists 71–80 publications: 257 scientists 81–90 publications: 361 scientists 91–100 publications: 440 scientists 101–110 publications: 492 scientists 111–120 publications: 541 scientists 121–130 publications: 617 scientists 131–140 publications: 544 scientists 141–150 publications: 541 scientists 151–160 publications: 539 scientists 161–170 publications: 444 scientists 171–180 publications: 444 scientists 181–190 publications: 400 scientists 191–200 publications: 377 scientists 201–210 publications: 318 scientists 211–220 publications: 283 scientists 221–230 publications: 263 scientists 231–240 publications: 220 scientists 241–250 publications: 217 scientists 251–260 publications: 180 scientists 261–270 publications: 181 scientists 271–280 publications: 155 scientists 281–290 publications: 130 scientists 291–300 publications: 127 scientists 301–310 publications: 130 scientists 311–320 publications: 85 scientists 321–330 publications: 106 scientists 331–340 publications: 80 scientists 341–350 publications: 83 scientists 351–360 publications: 75 scientists 361–370 publications: 69 scientists 371–380 publications: 52 scientists 381–390 publications: 54 scientists 391–400 publications: 56 scientists 401–410 publications: 44 scientists 411–420 publications: 40 scientists 421–430 publications: 36 scientists 431–440 publications: 25 scientists 441–450 publications: 25 scientists 451–460 publications: 32 scientists 461–470 publications: 29 scientists 471–480 publications: 21 scientists 481–490 publications: 26 scientists 491–500 publications: 25 scientists 501–510 publications: 17 scientists 511–520 publications: 18 scientists 521–530 publications: 15 scientists 531–540 publications: 22 scientists 541–550 publications: 12 scientists 551–560 publications: 15 scientists 561–570 publications: 11 scientists 571–580 publications: 19 scientists 581–590 publications: 9 scientists 591–600 publications: 9 scientists 601–610 publications: 7 scientists 611–620 publications: 11 scientists 621–630 publications: 5 scientists 631–640 publications: 5 scientists 641–650 publications: 6 scientists 651–660 publications: 3 scientists 661–670 publications: 3 scientists 671–680 publications: 4 scientists 681–686 publications: 3 scientists 687+ publications: 100 scientists
41 publications 687+

This scientist: 130 publications — 30th percentile

30% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 687 publications or more.

Tracy A. Villareal D-index placement in Environmental Sciences in 2026

The chart shows the D-index (discipline H-index) distribution of Environmental Sciences scientists ranked by Research.com in 2026. The highlighted bar marks where Tracy A. Villareal sits on this spectrum.

30 D-Index: 12 scientists 31 D-Index: 26 scientists 32 D-Index: 51 scientists 33 D-Index: 88 scientists 34 D-Index: 123 scientists 35 D-Index: 163 scientists 36 D-Index: 206 scientists 37 D-Index: 267 scientists 38 D-Index: 265 scientists 39 D-Index: 275 scientists 40 D-Index: 321 scientists 41 D-Index: 343 scientists 42 D-Index: 305 scientists 43 D-Index: 336 scientists 44 D-Index: 330 scientists 45 D-Index: 348 scientists 46 D-Index: 291 scientists 47 D-Index: 275 scientists 48 D-Index: 272 scientists 49 D-Index: 273 scientists 50 D-Index: 263 scientists 51 D-Index: 232 scientists 52 D-Index: 266 scientists 53 D-Index: 217 scientists 54 D-Index: 199 scientists 55 D-Index: 177 scientists 56 D-Index: 202 scientists 57 D-Index: 204 scientists 58 D-Index: 166 scientists 59 D-Index: 177 scientists 60 D-Index: 166 scientists 61 D-Index: 152 scientists 62 D-Index: 143 scientists 63 D-Index: 150 scientists 64 D-Index: 124 scientists 65 D-Index: 119 scientists 66 D-Index: 120 scientists 67 D-Index: 118 scientists 68 D-Index: 82 scientists 69 D-Index: 98 scientists 70 D-Index: 94 scientists 71 D-Index: 105 scientists 72 D-Index: 74 scientists 73 D-Index: 84 scientists 74 D-Index: 70 scientists 75 D-Index: 67 scientists 76 D-Index: 78 scientists 77 D-Index: 60 scientists 78 D-Index: 59 scientists 79 D-Index: 52 scientists 80 D-Index: 47 scientists 81 D-Index: 38 scientists 82 D-Index: 48 scientists 83 D-Index: 42 scientists 84 D-Index: 42 scientists 85 D-Index: 43 scientists 86 D-Index: 29 scientists 87 D-Index: 37 scientists 88 D-Index: 29 scientists 89 D-Index: 30 scientists 90 D-Index: 34 scientists 91 D-Index: 20 scientists 92 D-Index: 22 scientists 93 D-Index: 17 scientists 94 D-Index: 19 scientists 95 D-Index: 24 scientists 96 D-Index: 21 scientists 97 D-Index: 20 scientists 98 D-Index: 24 scientists 99 D-Index: 17 scientists 100 D-Index: 17 scientists 101 D-Index: 21 scientists 102 D-Index: 25 scientists 103 D-Index: 18 scientists 104 D-Index: 26 scientists 105 D-Index: 19 scientists 106 D-Index: 15 scientists 107 D-Index: 10 scientists 108 D-Index: 13 scientists 109 D-Index: 15 scientists 110 D-Index: 12 scientists 111 D-Index: 8 scientists 112 D-Index: 7 scientists 113 D-Index: 9 scientists 114 D-Index: 6 scientists 115 D-Index: 12 scientists 116 D-Index: 7 scientists 117 D-Index: 8 scientists 118 D-Index: 3 scientists 119 D-Index: 5 scientists 120 D-Index: 7 scientists 121 D-Index: 2 scientists 122 D-Index: 4 scientists 123 D-Index: 8 scientists 124 D-Index: 7 scientists 125+ D-Index: 99 scientists
30 D-Index 125+

This scientist: 56 D-Index — 63rd percentile

63% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 125 D-Index or more.

Overview

Tracy A. Villareal is affiliated with The University of Texas at Austin in the United States. Their research primarily spans Environmental Science, Earth and Planetary Sciences, and Biochemistry, Genetics, and Molecular Biology, integrating subfields such as Ecology, Oceanography, and Molecular Biology.

The scientist's main research topics include microbial community ecology and physiology, marine and coastal ecosystems, protist diversity and phylogeny, marine biology and ecology research, and isotope analysis in ecology.

Frequent publication venues for Villareal include:

  • Bergey's Manual of Systematics of Archaea and Bacteria
  • PeerJ
  • Frontiers in Microbiology
  • Biogeosciences

Recent papers authored or co-authored by Villareal are:

  • Isolation, growth, and nitrogen fixation rates of the Hemiaulus-Richelia (diatom-cyanobacterium) symbiosis in culture, 2020, PeerJ
  • Adaptation to an Intracellular Lifestyle by a Nitrogen-Fixing, Heterocyst-Forming Cyanobacterial Endosymbiont of a Diatom, 2022, Frontiers in Microbiology
  • Richelia, 2022, Bergey's Manual of Systematics of Archaea and Bacteria
  • Trichodesmium, 2022, Bergey's Manual of Systematics of Archaea and Bacteria
  • A time series analysis of transparent exopolymer particle distributions and C: N stoichiometry in the subtropical North Pacific: a key process in net community production and preformed nitrate anomalies?, 2025, Biogeosciences

Villareal frequently collaborates with other researchers, including:

  • Rachel A. Foster
  • John Waterbury
  • Eric A. Webb
  • Jonathan P. Zehr
  • Amy Pyle

Best Publications

  • High rates of N2 fixation by unicellular diazotrophs in the oligotrophic Pacific Ocean.

    Joseph P Montoya;Carolyn M Holl;Jonathan P Zehr;Andrew Hansen

  • Database of diazotrophs in global ocean: abundance, biomass and nitrogen fixation rates

    Y. W. Luo;S. C. Doney;L. A. Anderson;Mar Benavides

  • Red Tides in the Gulf of Mexico: Where, When, and Why?

    John J. Walsh;J. K. Jolliff;J. K. Jolliff;B. P. Darrow;J. M. Lenes

  • Nitrogen transport by vertically migrating diatom mats in the North Pacific Ocean

    Tracy A. Villareal;Mark A. Altabet;Karen Culver-Rymsza

  • Does the red tide dinoflagellate Karenia brevis use allelopathy to outcompete other phytoplankton

    Julia Kubanek;Melissa K. Hicks;Jerome Naar;Tracy A. Villareal

  • New perspectives on nitrogen-fixing microorganisms in tropical and subtropical oceans.

    Jonathan P Zehr;Edward J Carpenter;Tracy A Villareal

  • Upward transport of oceanic nitrate by migrating diatom mats

    Tracy A. Villareal;Cynthia Pilskaln;Mark Brzezinski;Fredric Lipschultz

  • Buoyancy Regulation and the Potential for Vertical Migration in the Oceanic Cyanobacterium Trichodesmium

    T.A. Villareal;E.J. Carpenter

  • Silica production and the contribution of diatoms to new and primary production in the central North Pacific

    Mark A. Brzezinski;Tracy A. Villareal;Fredric Lipschultz

  • A historical assessment of Karenia brevis in the western Gulf of Mexico

    Hugo A. Magaña;Cindy Contreras;Tracy A. Villareal

  • Petroleum production platforms as sites for the expansion of ciguatera in the northwestern Gulf, of Mexico

    T.A. Villareal;S. Hanson;Steve Qualia;E.L.E. Jester

  • Nitrogen-fixation by the cyanobacterial symbiont of the diatom genus Hemiaulus

    TA Villareal

  • The Role of Episodic Atmospheric Nutrient Inputs in the Chemical and Biological Dynamics of Oceanic Ecosystems

    Percy Donaghay;Peter Liss;Robert Duce;Dana Kester

  • The rise and fall of methanotrophy following a deepwater oil-well blowout

    M. Crespo-Medina;C. D. Meile;K. S. Hunter;A. R. Diercks

  • The relative food value of diatoms, dinoflagellates, flagellates, and cyanobacteria for tintinnid ciliates

    Peter G. Verity;Tracy A. Villareal

  • Macroalgal palatability and the flux of ciguatera toxins through marine food webs

    Edwin Cruz-Rivera;Tracy A. Villareal

  • High diatom production and export in stratified waters – A potential negative feedback to global warming

    Alan E.S. Kemp;Tracy A. Villareal

  • Marine Nitrogen-Fixing Diatom-Cyanobacteria Symbioses

    Tracy A. Villareal

  • Vertical migration of Rhizosolenia mats and their significance to NO3− fluxes in the central North Pacific gyre

    Tracy A. Villareal;Samantha Woods;J.Keith Moore;J.Keith Moore;Karen CulverRymsza

  • Laboratory Culture and Preliminary Characterization of the Nitrogen-Fixing Rhizosolenia-Richelia Symbiosis

    Tracy A. Villareal

Frequent Co-Authors

Joseph P. Montoya
Joseph P. Montoya Georgia Institute of Technology
Ellen C. Hopmans
Ellen C. Hopmans Royal Netherlands Institute for Sea Research
Jonathan P. Zehr
Jonathan P. Zehr University of California, Santa Cruz
Mark A. Brzezinski
Mark A. Brzezinski University of California, Santa Barbara
Edward J. Buskey
Edward J. Buskey The University of Texas at Austin
Corina P. D. Brussaard
Corina P. D. Brussaard Utrecht University
Margaret R. Mulholland
Margaret R. Mulholland Old Dominion University
Jaap S. Sinninghe Damsté
Jaap S. Sinninghe Damsté Royal Netherlands Institute for Sea Research
Ilana Berman-Frank
Ilana Berman-Frank University of Haifa
David M. Karl
David M. Karl University of Hawaii at Manoa

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