World's Best Scientists 2026 revealed!

D-Index & Metrics

Ecology and Evolution

D-Index
45
Citations
6868
World Ranking
4896
National Ranking
6

John O'Halloran publication distribution in Ecology and Evolution in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Ecology and Evolution in 2026. The highlighted bar marks where John O'Halloran sits on this spectrum.

37–41 publications: 2 scientists 42–46 publications: 9 scientists 47–51 publications: 10 scientists 52–56 publications: 31 scientists 57–61 publications: 56 scientists 62–66 publications: 91 scientists 67–71 publications: 92 scientists 72–76 publications: 127 scientists 77–81 publications: 173 scientists 82–86 publications: 236 scientists 87–91 publications: 227 scientists 92–96 publications: 240 scientists 97–101 publications: 333 scientists 102–106 publications: 280 scientists 107–111 publications: 300 scientists 112–116 publications: 285 scientists 117–121 publications: 305 scientists 122–126 publications: 287 scientists 127–131 publications: 278 scientists 132–136 publications: 289 scientists 137–141 publications: 273 scientists 142–146 publications: 262 scientists 147–151 publications: 246 scientists 152–156 publications: 235 scientists 157–161 publications: 205 scientists 162–166 publications: 199 scientists 167–171 publications: 174 scientists 172–176 publications: 164 scientists 177–181 publications: 173 scientists 182–186 publications: 189 scientists 187–191 publications: 170 scientists 192–196 publications: 139 scientists 197–201 publications: 128 scientists 202–206 publications: 117 scientists 207–211 publications: 115 scientists 212–216 publications: 107 scientists 217–221 publications: 124 scientists 222–226 publications: 81 scientists 227–231 publications: 82 scientists 232–236 publications: 85 scientists 237–241 publications: 75 scientists 242–246 publications: 66 scientists 247–251 publications: 81 scientists 252–256 publications: 69 scientists 257–261 publications: 70 scientists 262–266 publications: 55 scientists 267–271 publications: 64 scientists 272–276 publications: 49 scientists 277–281 publications: 48 scientists 282–286 publications: 44 scientists 287–291 publications: 45 scientists 292–296 publications: 36 scientists 297–301 publications: 39 scientists 302–306 publications: 38 scientists 307–311 publications: 30 scientists 312–316 publications: 34 scientists 317–321 publications: 25 scientists 322–326 publications: 22 scientists 327–331 publications: 28 scientists 332–336 publications: 30 scientists 337–341 publications: 22 scientists 342–346 publications: 30 scientists 347–351 publications: 26 scientists 352–356 publications: 22 scientists 357–361 publications: 29 scientists 362–366 publications: 21 scientists 367–371 publications: 12 scientists 372–376 publications: 18 scientists 377–381 publications: 17 scientists 382–386 publications: 13 scientists 387–391 publications: 21 scientists 392–396 publications: 13 scientists 397–401 publications: 10 scientists 402–406 publications: 15 scientists 407–411 publications: 8 scientists 412–416 publications: 9 scientists 417–421 publications: 8 scientists 422–426 publications: 4 scientists 427–431 publications: 10 scientists 432–436 publications: 10 scientists 437–441 publications: 5 scientists 442–446 publications: 4 scientists 447–451 publications: 10 scientists 452–456 publications: 2 scientists 457–461 publications: 4 scientists 462–466 publications: 7 scientists 467–471 publications: 7 scientists 472–476 publications: 6 scientists 477–481 publications: 6 scientists 482–486 publications: 3 scientists 487–491 publications: 3 scientists 492–496 publications: 4 scientists 497–501 publications: 4 scientists 502–506 publications: 8 scientists 507–511 publications: 5 scientists 512–516 publications: 4 scientists 517–521 publications: 5 scientists 522–526 publications: 4 scientists 527–530 publications: 5 scientists 531+ publications: 100 scientists
37 publications 531+

This scientist: 238 publications — 83rd percentile

83% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 531 publications or more.

John O'Halloran D-index placement in Ecology and Evolution in 2026

The chart shows the D-index (discipline H-index) distribution of Ecology and Evolution scientists ranked by Research.com in 2026. The highlighted bar marks where John O'Halloran sits on this spectrum.

30 D-Index: 95 scientists 31 D-Index: 123 scientists 32 D-Index: 191 scientists 33 D-Index: 245 scientists 34 D-Index: 252 scientists 35 D-Index: 244 scientists 36 D-Index: 249 scientists 37 D-Index: 244 scientists 38 D-Index: 254 scientists 39 D-Index: 254 scientists 40 D-Index: 280 scientists 41 D-Index: 274 scientists 42 D-Index: 266 scientists 43 D-Index: 233 scientists 44 D-Index: 248 scientists 45 D-Index: 208 scientists 46 D-Index: 201 scientists 47 D-Index: 213 scientists 48 D-Index: 207 scientists 49 D-Index: 172 scientists 50 D-Index: 209 scientists 51 D-Index: 199 scientists 52 D-Index: 153 scientists 53 D-Index: 169 scientists 54 D-Index: 163 scientists 55 D-Index: 148 scientists 56 D-Index: 120 scientists 57 D-Index: 146 scientists 58 D-Index: 137 scientists 59 D-Index: 140 scientists 60 D-Index: 104 scientists 61 D-Index: 119 scientists 62 D-Index: 118 scientists 63 D-Index: 99 scientists 64 D-Index: 77 scientists 65 D-Index: 100 scientists 66 D-Index: 86 scientists 67 D-Index: 83 scientists 68 D-Index: 75 scientists 69 D-Index: 94 scientists 70 D-Index: 57 scientists 71 D-Index: 68 scientists 72 D-Index: 59 scientists 73 D-Index: 63 scientists 74 D-Index: 66 scientists 75 D-Index: 60 scientists 76 D-Index: 42 scientists 77 D-Index: 49 scientists 78 D-Index: 39 scientists 79 D-Index: 37 scientists 80 D-Index: 43 scientists 81 D-Index: 41 scientists 82 D-Index: 45 scientists 83 D-Index: 34 scientists 84 D-Index: 40 scientists 85 D-Index: 35 scientists 86 D-Index: 55 scientists 87 D-Index: 24 scientists 88 D-Index: 24 scientists 89 D-Index: 30 scientists 90 D-Index: 23 scientists 91 D-Index: 25 scientists 92 D-Index: 27 scientists 93 D-Index: 27 scientists 94 D-Index: 13 scientists 95 D-Index: 23 scientists 96 D-Index: 12 scientists 97 D-Index: 14 scientists 98 D-Index: 19 scientists 99 D-Index: 16 scientists 100 D-Index: 14 scientists 101 D-Index: 5 scientists 102 D-Index: 21 scientists 103 D-Index: 16 scientists 104 D-Index: 10 scientists 105 D-Index: 7 scientists 106 D-Index: 7 scientists 107 D-Index: 7 scientists 108 D-Index: 6 scientists 109 D-Index: 9 scientists 110 D-Index: 11 scientists 111 D-Index: 12 scientists 112 D-Index: 9 scientists 113 D-Index: 7 scientists 114 D-Index: 3 scientists 115 D-Index: 8 scientists 116 D-Index: 5 scientists 117 D-Index: 11 scientists 118 D-Index: 4 scientists 119 D-Index: 2 scientists 120 D-Index: 5 scientists 121+ D-Index: 100 scientists
30 D-Index 121+

This scientist: 45 D-Index — 44th percentile

44% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 121 D-Index or more.

Overview

John O'Halloran is affiliated with University College Cork in Ireland and conducts research primarily in the field of Environmental Science. Their work covers a range of subfields including Ecology, Pollution, Global and Planetary Change, Industrial and Manufacturing Engineering, and Nature and Landscape Conservation.

The scientist's research topics include Microplastics and Plastic Pollution, Recycling and Waste Management Techniques, Ecology and Vegetation Dynamics Studies, Wildlife Ecology and Conservation, biodegradable polymer synthesis and properties, Avian ecology and behavior, and Species Distribution and Climate Change.

Recent publications by John O'Halloran include:

  • "The contribution of insects to global forest deadwood decomposition" (2021, Nature)
  • "Adsorption, uptake and toxicity of micro- and nanoplastics: Effects on terrestrial plants and aquatic macrophytes" (2021, Environmental Pollution)
  • "Rapid fragmentation of microplastics by the freshwater amphipod Gammarus duebeni (Lillj.)" (2020, Scientific Reports)
  • "Beyond plastic microbeads - Short-term feeding of cellulose and polyester microfibers to the freshwater amphipod Gammarus duebeni" (2020, The Science of The Total Environment)
  • "Trophic transfer of microplastics in a model freshwater microcosm; lack of a consumer avoidance response" (2022, Food Webs)

Frequent coauthors include Sandra Irwin, Marcel A. K. Jansen, John Lusby, Alan McCarthy, and Anthony Caravaggi.

Publications by John O'Halloran have appeared in a variety of scientific journals and venues with multiple contributions to Zenodo (CERN European Organization for Nuclear Research), Nature, Environmental Pollution, Scientific Reports, and The Science of The Total Environment.

Best Publications

  • Stocking density, growth and growth variation in juvenile turbot, Scophthalmus maximus (Rafinesque)

    S Irwin;J O'Halloran;R.D FitzGerald

  • The contribution of insects to global forest deadwood decomposition

    Sebastian Seibold;Werner Rammer;Torsten Hothorn;Rupert Seidl

  • Adsorption, uptake and toxicity of micro- and nanoplastics: Effects on terrestrial plants and aquatic macrophytes.

    Alicia Mateos-Cárdenas;Frank N.A.M. van Pelt;John O’Halloran;Marcel A.K. Jansen

  • Assessment of a glutathione S-transferase and related proteins in the gill and digestive gland of Mytilus edulis (L.), as potential organic pollution biomarkers

    Patrick J. Fitzpatrick;John O'Halloran;David Sheehan;Andrew R. Walsh

  • Shellfish toxicity: human health implications of marine algal toxins.

    K. J. James;B. Carey;J. O'halloran;F. N. A. M. van Pelt

  • Structural indicators of spider communities across the forest plantation cycle

    Anne G. Oxbrough;Tom Gittings;John O’Halloran;Paul S. Giller

  • Rapid fragmentation of microplastics by the freshwater amphipod Gammarus duebeni (Lillj.)

    Alicia Mateos-Cárdenas;John O'Halloran;Frank N A M van Pelt;Marcel A K Jansen

  • Identification of Novel Mutations in the Ryanodine-Receptor Gene (RYR1) in Malignant Hyperthermia: Genotype-Phenotype Correlation

    Bernadette M. Manning;Kathleen A. Quane;Helle Ording;Albert Urwyler

  • Alumina nanoparticles enhance growth of Lemna minor.

    Guillaume Juhel;Emeline Batisse;Quitterie Hugues;Deirdre Daly

  • b+WSN

    Fiona Edwards-Murphy;Michele Magno;Pádraig M. Whelan;John O'Halloran

  • The ecology of dippers Cinclus cinclus in relation to stream acidity in upland Wales : breeding performance, calcium physiology and nestling growth

    S. J. Ormerod;J. O'Halloran;S. D. Gribbin;Stephanie J. Tyler

  • Identifying practical indicators of biodiversity for stand-level management of plantation forests

    George F Smith;George F Smith;Tom Gittings;Mark Wilson;Laura French

  • Protein carbonylation and heat shock response in Ruditapes decussatus following p,p'-dichlorodiphenyldichloroethylene (DDE) exposure: a proteomic approach reveals that DDE causes oxidative stress.

    Vera Dowling;Pascal C. Hoarau;Michèle Romeo;John O’Halloran

  • The contribution of open spaces to the maintenance of hoverfly (Diptera, Syrphidae) biodiversity in Irish plantation forests

    Tom Gittings;John O’Halloran;Tom Kelly;Paul S. Giller

  • Experimental provision of large woody debris in streams as a trout management technique

    B.M. Lehane;P.S. Giller;J. O'Halloran;C. Smith

  • Detecting genotoxicity using the Comet assay following chronic exposure of Manila clam Tapes semidecussatus to polluted estuarine sediments.

    B.M. Coughlan;M.G.J. Hartl;S.J. O’Reilly;D. Sheehan

  • Chromium speciation in tannery effluent—II. Speciation in the effluent and in a receiving estuary

    Andrew R. Walsh;John O'Halloran

  • Chromium speciation in tannery effluent—I. An assessment of techniques and the role of organic Cr(III) complexes

    Andrew R. Walsh;John O'Halloran

  • Pseudodiarrhoea in zebra mussels Dreissena polymorpha (Pallas) exposed to microcystins.

    Guillaume Juhel;John Davenport;John O'Halloran;Sarah Culloty

  • Can mixed species stands enhance arthropod diversity in plantation forests

    Anne Oxbrough;Veronica French;Sandra Irwin;Thomas C. Kelly

Frequent Co-Authors

Paul S. Giller
Paul S. Giller University College Cork
Nora M. O'Brien
Nora M. O'Brien University College Cork
David Sheehan
David Sheehan University College Cork
Carmel Mothersill
Carmel Mothersill McMaster University
Marcel A. K. Jansen
Marcel A. K. Jansen University College Cork
John R. Spence
John R. Spence University of Alberta
Ambrose Furey
Ambrose Furey Munster Technological University
John Davenport
John Davenport University College Cork
Alan A. Myers
Alan A. Myers University College Cork
Fergal O'Gara
Fergal O'Gara University College Cork

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