World's Best Scientists 2026 revealed!

D-Index & Metrics

Plant Science and Agronomy

D-Index
42
Citations
9443
World Ranking
3379
National Ranking
33

Ecology and Evolution

D-Index
46
Citations
9949
World Ranking
4593
National Ranking
47

Timothy G. O’Connor publication distribution in Plant Science and Agronomy in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Plant Science and Agronomy in 2026. The highlighted bar marks where Timothy G. O’Connor sits on this spectrum.

36–40 publications: 2 scientists 41–45 publications: 7 scientists 46–50 publications: 40 scientists 51–55 publications: 58 scientists 56–60 publications: 60 scientists 61–65 publications: 107 scientists 66–70 publications: 130 scientists 71–75 publications: 153 scientists 76–80 publications: 191 scientists 81–85 publications: 199 scientists 86–90 publications: 206 scientists 91–95 publications: 218 scientists 96–100 publications: 226 scientists 101–105 publications: 227 scientists 106–110 publications: 247 scientists 111–115 publications: 255 scientists 116–120 publications: 253 scientists 121–125 publications: 233 scientists 126–130 publications: 219 scientists 131–135 publications: 201 scientists 136–140 publications: 194 scientists 141–145 publications: 176 scientists 146–150 publications: 157 scientists 151–155 publications: 147 scientists 156–160 publications: 151 scientists 161–165 publications: 159 scientists 166–170 publications: 137 scientists 171–175 publications: 128 scientists 176–180 publications: 126 scientists 181–185 publications: 98 scientists 186–190 publications: 114 scientists 191–195 publications: 100 scientists 196–200 publications: 90 scientists 201–205 publications: 71 scientists 206–210 publications: 98 scientists 211–215 publications: 70 scientists 216–220 publications: 86 scientists 221–225 publications: 61 scientists 226–230 publications: 58 scientists 231–235 publications: 53 scientists 236–240 publications: 64 scientists 241–245 publications: 39 scientists 246–250 publications: 46 scientists 251–255 publications: 51 scientists 256–260 publications: 36 scientists 261–265 publications: 44 scientists 266–270 publications: 35 scientists 271–275 publications: 30 scientists 276–280 publications: 33 scientists 281–285 publications: 35 scientists 286–290 publications: 36 scientists 291–295 publications: 26 scientists 296–300 publications: 26 scientists 301–305 publications: 31 scientists 306–310 publications: 30 scientists 311–315 publications: 21 scientists 316–320 publications: 29 scientists 321–325 publications: 14 scientists 326–330 publications: 15 scientists 331–335 publications: 15 scientists 336–340 publications: 17 scientists 341–345 publications: 15 scientists 346–350 publications: 12 scientists 351–355 publications: 17 scientists 356–360 publications: 18 scientists 361–365 publications: 12 scientists 366–370 publications: 11 scientists 371–375 publications: 6 scientists 376–380 publications: 6 scientists 381–385 publications: 11 scientists 386–390 publications: 9 scientists 391–395 publications: 10 scientists 396–400 publications: 8 scientists 401–405 publications: 4 scientists 406–410 publications: 9 scientists 411–415 publications: 11 scientists 416–420 publications: 4 scientists 421–425 publications: 7 scientists 426–430 publications: 4 scientists 431–435 publications: 3 scientists 436–440 publications: 5 scientists 441–445 publications: 8 scientists 446–450 publications: 6 scientists 451–455 publications: 7 scientists 456–460 publications: 5 scientists 461–465 publications: 6 scientists 466 publications: 2 scientists 467+ publications: 99 scientists
36 publications 467+

This scientist: 121 publications — 40th percentile

40% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 467 publications or more.

Timothy G. O’Connor D-index placement in Plant Science and Agronomy in 2026

The chart shows the D-index (discipline H-index) distribution of Plant Science and Agronomy scientists ranked by Research.com in 2026. The highlighted bar marks where Timothy G. O’Connor sits on this spectrum.

30 D-Index: 200 scientists 31 D-Index: 236 scientists 32 D-Index: 253 scientists 33 D-Index: 283 scientists 34 D-Index: 288 scientists 35 D-Index: 240 scientists 36 D-Index: 246 scientists 37 D-Index: 243 scientists 38 D-Index: 247 scientists 39 D-Index: 229 scientists 40 D-Index: 232 scientists 41 D-Index: 230 scientists 42 D-Index: 228 scientists 43 D-Index: 219 scientists 44 D-Index: 193 scientists 45 D-Index: 164 scientists 46 D-Index: 158 scientists 47 D-Index: 143 scientists 48 D-Index: 131 scientists 49 D-Index: 127 scientists 50 D-Index: 122 scientists 51 D-Index: 122 scientists 52 D-Index: 110 scientists 53 D-Index: 102 scientists 54 D-Index: 98 scientists 55 D-Index: 79 scientists 56 D-Index: 85 scientists 57 D-Index: 88 scientists 58 D-Index: 91 scientists 59 D-Index: 62 scientists 60 D-Index: 61 scientists 61 D-Index: 59 scientists 62 D-Index: 54 scientists 63 D-Index: 61 scientists 64 D-Index: 59 scientists 65 D-Index: 58 scientists 66 D-Index: 41 scientists 67 D-Index: 49 scientists 68 D-Index: 39 scientists 69 D-Index: 32 scientists 70 D-Index: 40 scientists 71 D-Index: 47 scientists 72 D-Index: 38 scientists 73 D-Index: 28 scientists 74 D-Index: 29 scientists 75 D-Index: 28 scientists 76 D-Index: 22 scientists 77 D-Index: 21 scientists 78 D-Index: 25 scientists 79 D-Index: 26 scientists 80 D-Index: 19 scientists 81 D-Index: 16 scientists 82 D-Index: 12 scientists 83 D-Index: 16 scientists 84 D-Index: 14 scientists 85 D-Index: 11 scientists 86 D-Index: 17 scientists 87 D-Index: 13 scientists 88 D-Index: 10 scientists 89 D-Index: 12 scientists 90 D-Index: 18 scientists 91 D-Index: 16 scientists 92 D-Index: 16 scientists 93 D-Index: 17 scientists 94 D-Index: 12 scientists 95 D-Index: 8 scientists 96 D-Index: 9 scientists 97 D-Index: 9 scientists 98 D-Index: 11 scientists 99 D-Index: 12 scientists 100 D-Index: 5 scientists 101 D-Index: 8 scientists 102 D-Index: 4 scientists 103 D-Index: 11 scientists 104 D-Index: 5 scientists 105 D-Index: 9 scientists 106 D-Index: 7 scientists 107 D-Index: 4 scientists 108 D-Index: 8 scientists 109+ D-Index: 99 scientists
30 D-Index 109+

This scientist: 42 D-Index — 49th percentile

49% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 109 D-Index or more.

Overview

What is he best known for?

The fields of study he is best known for:

  • Ecology
  • Ecosystem
  • Habitat

His primary scientific interests are in Ecology, Grazing, Agronomy, Herbivore and Perennial plant. His Ecology study typically links adjacent topics like Biological dispersal. His Grazing research includes themes of Shrub and Density dependence.

His study in Agronomy is interdisciplinary in nature, drawing from both Acacia and Botany. As a part of the same scientific family, Timothy G. O’Connor mostly works in the field of Herbivore, focusing on Agroforestry and, on occasion, Woody cover. His Perennial plant research incorporates themes from Shrubland, Vegetation, Forb, Seasonality and Ephemeral key.

His most cited work include:

  • Dynamics of shrub encroachment in an African savanna: relative influences of fire, herbivory, rainfall and density dependence (608 citations)
  • ON THE RELEVANCE OF NONEQUILIBRIUM CONCEPTS TO ARID AND SEMIARID GRAZING SYSTEMS (453 citations)
  • Resource heterogeneity and ungulate population dynamics (257 citations)

What are the main themes of his work throughout his whole career to date?

Ecology, Grassland, Grazing, Vegetation and Agronomy are his primary areas of study. His study in Species richness, Herbivore, Woodland, Arid and Abundance falls within the category of Ecology. His Grassland research also works with subjects such as

  • Biodiversity, which have a strong connection to Environmental resource management and Habitat,
  • Climate change that intertwine with fields like Global biodiversity and Land use.

His studies in Grazing integrate themes in fields like Perennial plant, Agroforestry, Livestock and Biological dispersal. His Vegetation research focuses on Ordination and how it relates to Shrub. His Agronomy research is multidisciplinary, relying on both Acacia, Botany and Stocking.

He most often published in these fields:

  • Ecology (56.25%)
  • Grassland (32.29%)
  • Grazing (27.08%)

What were the highlights of his more recent work (between 2016-2021)?

  • Ecology (56.25%)
  • Grassland (32.29%)
  • Vegetation (26.04%)

In recent papers he was focusing on the following fields of study:

Timothy G. O’Connor mostly deals with Ecology, Grassland, Vegetation, Grazing and Biodiversity. The Species richness, Forb, Arid and Threatened species research Timothy G. O’Connor does as part of his general Ecology study is frequently linked to other disciplines of science, such as Persistence, therefore creating a link between diverse domains of science. His research in Grassland intersects with topics in Montane ecology, Edaphic, Ecosystem services, Climate change and Livestock.

His work on Fire ecology as part of general Vegetation research is frequently linked to Spatial variability, thereby connecting diverse disciplines of science. His Grazing research entails a greater understanding of Agronomy. His Agronomy research integrates issues from Stocking and Vegetation composition.

Between 2016 and 2021, his most popular works were:

  • Grasslands—more important for ecosystem services than you might think (79 citations)
  • Impact of sheep grazing intensity on vegetation at the Arid Karoo Stocking Rate Trial after 27 years, Carnarvon, South Africa (11 citations)
  • Planning for the Maintenance of Floristic Diversity in the Face of Land Cover and Climate Change (10 citations)

In his most recent research, the most cited papers focused on:

  • Ecology
  • Ecosystem
  • Biodiversity

His main research concerns Vegetation, Grassland, Grazing, Ecology and Woody plant. His Grassland research includes elements of Agriculture, Agricultural productivity, Livelihood and Ecosystem services. Grazing is a subfield of Agronomy that he studies.

His research investigates the connection between Agronomy and topics such as Abundance that intersect with problems in Biodiversity. All of his Ecology and Arid and Forb investigations are sub-components of the entire Ecology study. His work carried out in the field of Woody plant brings together such families of science as Vegetation composition, Soil texture, Soil water, Water content and Woodland.

Best Publications

  • Grasslands—more important for ecosystem services than you might think

    J. Bengtsson;J. Bengtsson;J. M. Bullock;B. Egoh;B. Egoh;C. Everson

  • Dynamics of shrub encroachment in an African savanna: relative influences of fire, herbivory, rainfall and density dependence

    K.G. Roques;T.G. O'Connor;A.R. Watkinson

  • ON THE RELEVANCE OF NONEQUILIBRIUM CONCEPTS TO ARID AND SEMIARID GRAZING SYSTEMS

    A. W. Illius;T. G. O’Connor

  • Bush encroachment in southern Africa: changes and causes

    Tim G O'Connor;James R Puttick;M Timm Hoffman

  • Resource heterogeneity and ungulate population dynamics

    A. W. Illius;T. G. O'Connor

  • The influence of grazing on seed production and seed banks of some African savanna grasslands

    T. G. O'connor;G. A. Pickett

  • Effect of stocking rate and rainfall on rangeland dynamics and cattle performance in a semi‐arid savanna, South Africa

    R.W.S. Fynn;T.G. O'Connor

  • Influence of precipitation and species composition on phytomass of a semi‐arid African grassland

    T. G. O'Connor;L. M. Haines;H. A. Snyman

  • LOCAL EXTINCTION IN PERENNIAL GRASSLANDS: A LIFE-HISTORY APPROACH

    T. G. O'connor

  • A functional hypothesis of the threat of local extirpation of woody plant species by elephant in Africa

    Timothy G. O’Connor;Peter S. Goodman;Bruce Clegg

  • Vegetation Changes (1949-71) in a Semi-Arid, Grassy Dwarf Shrubland in the Karoo, South Africa: Influence of Rainfall Variability and Grazing by Sheep

    T. G. O'connor;P. W. Roux

  • Composition and population responses of an African savanna grassland to rainfall and grazing

    T.G. O'Connor

  • Acacia karroo invasion of grassland: environmental and biotic effects influencing seedling emergence and establishment.

    T. G. O'Connor

  • Burning causes long-term changes in soil organic matter content of a South African grassland

    R.W.S. Fynn;R.J. Haynes;T.G. O'Connor

  • Growth, biomass estimates, and charcoal production of Acacia drepanolobium in Laikipia, Kenya

    B.D Okello;T.G O’Connor;T.P Young

  • Synthesis of field experiments concerning the grass layer in the savanna regions of southern Africa

    TG O'Connor

  • Systematic land-cover change in KwaZulu-Natal, South Africa: Implications for biodiversity.

    Debbie Jewitt;Debbie Jewitt;Peter S. Goodman;Peter S. Goodman;Barend F.N. Erasmus;Timothy G. O'Connor

  • Influence of land use on plant community composition and diversity in Highland Sourveld grassland in the southern Drakensberg, South Africa.

    T. G. O'connor

  • Elephant utilization of Colophospermum mopane: possible benefits of hedging

    J. J. Smallie;T. G. O'connor

  • Transformation of a savanna grassland by drought and grazing

    T.G. O'Connor

  • Determinants of community organization of a South African mesic grassland

    Richard W.S. Fynn;Timothy G. O'Connor

  • Review Paper Bush encroachment in southern Africa: changes and causes

    Tim G O’Connor;James R Puttick;M Timm Hoffman

Frequent Co-Authors

Ed T.F. Witkowski
Ed T.F. Witkowski University of the Witwatersrand
Kevin P. Kirkman
Kevin P. Kirkman University of KwaZulu-Natal
Andrew W. Illius
Andrew W. Illius University of Edinburgh
Jan Bengtsson
Jan Bengtsson Swedish University of Agricultural Sciences
Regina Lindborg
Regina Lindborg Stockholm University
Patrick J. O’Farrell
Patrick J. O’Farrell University of Cape Town
Benis Egoh
Benis Egoh University of California, Irvine
Suzanne J. Milton
Suzanne J. Milton University of Cape Town
Sally Archibald
Sally Archibald University of the Witwatersrand
Richard J. Haynes
Richard J. Haynes University of Queensland

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