World's Best Scientists 2026 revealed!

D-Index & Metrics

Ecology and Evolution

D-Index
85
Citations
38211
World Ranking
622
National Ranking
95

Geoff A. Parker 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 Geoff A. Parker 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: 176 publications — 65th percentile

65% of scientists in this discipline score the same or lower.

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

Geoff A. Parker 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 Geoff A. Parker 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: 85 D-Index — 93rd percentile

93% of scientists in this discipline score the same or lower.

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

Overview

What is he best known for?

The fields of study he is best known for:

  • Ecology
  • Natural selection
  • Genetics

Geoff A. Parker spends much of his time researching Social psychology, Ecology, Sperm competition, Sperm and Evolutionary biology. His Social psychology research includes themes of Developmental psychology, Parental investment and Parent–offspring conflict. Geoff A. Parker combines subjects such as Microeconomics and Sex ratio with his study of Ecology.

In the subject of general Sperm competition, his work in Female sperm storage is often linked to Demography and Sperm heteromorphism, thereby combining diverse domains of study. His studies deal with areas such as Human fertilization and Reproductive success as well as Sperm. His work focuses on many connections between Evolutionary biology and other disciplines, such as Genetics, that overlap with his field of interest in Sexual dimorphism.

His most cited work include:

  • SPERM COMPETITION AND ITS EVOLUTIONARY CONSEQUENCES IN THE INSECTS (3054 citations)
  • Assessment strategy and the evolution of fighting behaviour. (1665 citations)
  • THE LOGIC OF ASYMMETRIC CONTESTS (1563 citations)

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

The scientist’s investigation covers issues in Ecology, Zoology, Sperm competition, Sperm and Sexual selection. His work carried out in the field of Ecology brings together such families of science as Life history theory and Human fertilization. Geoff A. Parker interconnects Fecundity, Avian clutch size, Reproduction and Predation in the investigation of issues within Zoology.

His Sperm competition study which covers Gonadosomatic Index that intersects with Gonad. His Sperm study combines topics in areas such as Statistics and Sperm Numbers. The Sexual conflict research Geoff A. Parker does as part of his general Sexual selection study is frequently linked to other disciplines of science, such as Anisogamy and Isogamy, therefore creating a link between diverse domains of science.

He most often published in these fields:

  • Ecology (45.33%)
  • Zoology (32.67%)
  • Sperm competition (28.00%)

What were the highlights of his more recent work (between 2009-2021)?

  • Ecology (45.33%)
  • Zoology (32.67%)
  • Sperm competition (28.00%)

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

His primary areas of study are Ecology, Zoology, Sperm competition, Sexual selection and Anisogamy. His Mating, Host and Trophic level study in the realm of Ecology interacts with subjects such as Spermatophylax. As a part of the same scientific family, Geoff A. Parker mostly works in the field of Zoology, focusing on Reproduction and, on occasion, Competition, Sperm precedence, Sperm Numbers and Trade-off.

His Sperm competition study is associated with Sperm. His biological study spans a wide range of topics, including Reproductive success and Human fertilization. His research investigates the link between Sexual selection and topics such as Selection that cross with problems in Darwinism.

Between 2009 and 2021, his most popular works were:

  • Sperm competition and ejaculate economics. (416 citations)
  • Inclusive fitness theory and eusociality (280 citations)
  • Nuptial Feeding in Insects: Mating Effort versus Paternal Investment (166 citations)

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

  • Ecology
  • Natural selection
  • Genetics

His primary areas of investigation include Ecology, Sperm competition, Mating, Sexual selection and Sperm. He integrates Ecology and Spermatophylax in his studies. His research combines Internal fertilization and Sperm competition.

His Sexual selection course of study focuses on Selection and Reproductive success, Developmental psychology, Sex characteristics, Microeconomics and Female sperm. His study explores the link between Sperm and topics such as Reproduction that cross with problems in Sperm precedence, Sperm Numbers and Trade-off. The concepts of his Zoology study are interwoven with issues in Competition and Human fertilization.

Best Publications

  • SPERM COMPETITION AND ITS EVOLUTIONARY CONSEQUENCES IN THE INSECTS

    G. A. Parker

  • Assessment strategy and the evolution of fighting behaviour.

    G.A. Parker

  • THE LOGIC OF ASYMMETRIC CONTESTS

    John Maynard Smith;G.A. Parker

  • Punishment in animal societies.

    T. H. Clutton-Brock;G. A. Parker

  • Sperm competition, male prudence and sperm-limited females

    Nina Wedell;Matthew J.G. Gage;Geoffrey A. Parker

  • Optimality theory in evolutionary biology

    G. A. Parker

  • Potential Reproductive Rates and the Operation of Sexual Selection

    T. H. Clutton-Brock;G. A. Parker

  • Sexual coercion in animal societies

    T.H. Clutton-Brock;G.A. Parker

  • Sexual conflict over mating and fertilization: an overview

    Geoff Parker

  • The origin and evolution of gamete dimorphism and the male-female phenomenon.

    G.A. Parker;R.R. Baker;V.G.F. Smith

  • Sperm competition and ejaculate economics.

    Geoff A. Parker;Tommaso Pizzari

  • Sperm competition in fishes: the evolution of testis size and ejaculate characteristics.

    P. Stockley;M. J. G. Gage;G. A. Parker;A. P. Møller

  • Sexual conflict and speciation

    G A Parker;L Partridge

  • Courtship Persistence and Female-Guarding as Male Time Investment Strategies

    G.A. Parker

  • OPTIMAL EGG SIZE AND CLUTCH SIZE: EFFECTS OF ENVIRONMENT AND MATERNAL PHENOTYPE

    Geoffrey A. Parker;Michael Begon

  • Spermatozoal traits and sperm competition in Atlantic salmon: relative sperm velocity is the primary determinant of fertilization success.

    Matthew J.G. Gage;Christopher P. Macfarlane;Sarah Yeates;Richard G. Ward

  • Role assessment, reserve strategy, and acquisition of information in asymmetric animal conflicts

    G. A. Parker;Daniel Ian Rubenstein

  • Inclusive fitness theory and eusociality

    Patrick Abbot;Jun Abe;John Alcock;Samuel Alizon

  • Ideal free distributions when individuals differ in competitive ability: phenotype-limited ideal free models

    G.A. Parker;W.J. Sutherland

  • Sperm competition games: a prospective analysis of risk assessment

    G. A. Parker;M. A. Ball;P. Stockley;M. J. G. Gage

Frequent Co-Authors

Leigh W. Simmons
Leigh W. Simmons University of Western Australia
Paula Stockley
Paula Stockley University of Liverpool
Nick J. Royle
Nick J. Royle University of Exeter
Tommaso Pizzari
Tommaso Pizzari University of Oxford
Tim R. Birkhead
Tim R. Birkhead University of Sheffield
Ian R. Hartley
Ian R. Hartley Lancaster University
Tim H. Clutton-Brock
Tim H. Clutton-Brock University of Cambridge
Scott Pitnick
Scott Pitnick Syracuse University
William J. Sutherland
William J. Sutherland University of Cambridge
Matthew J. G. Gage
Matthew J. G. Gage University of East Anglia

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