World's Best Scientists 2026 revealed!

D-Index & Metrics

Environmental Sciences

D-Index
35
Citations
8087
World Ranking
9230
National Ranking
117

Ivar Folstad 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 Ivar Folstad 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: 74 publications — 3rd percentile

3% of scientists in this discipline score the same or lower.

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

Ivar Folstad 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 Ivar Folstad 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: 35 D-Index — 5th percentile

5% of scientists in this discipline score the same or lower.

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

Overview

Ivar Folstad is affiliated with the University of Tromsø - The Arctic University of Norway. Their research spans multiple disciplines, primarily focusing on environmental science and psychology.

The main fields of study associated with their work include:

  • Environmental Science
  • Psychology

Within these fields, Folstad has contributed to several subfields such as:

  • Nature and Landscape Conservation
  • Global and Planetary Change
  • Experimental and Cognitive Psychology
  • Gender Studies
  • Social Psychology

Their research topics cover diverse areas combining biological and psychological perspectives, including:

  • Fish Ecology and Management Studies
  • Marine and Fisheries Research
  • Fish Biology, Ecology, and Behavior
  • Evolutionary Psychology and Human Behavior
  • Demographic Trends and Gender Preferences
  • Attachment and Relationship Dynamics

Recent publications illustrate the range of Folstad's work. These include:

  • "Cannibalism and protective behavior of eggs in Arctic charr (Salvelinus alpinus)", 2021, published in Ecology and Evolution
  • "Resemblance Reporting on Children: Sisters Are More Proactive than Brothers", 2022, published in Evolutionary Psychological Science

Folstad has worked collaboratively with several co-authors, often engaging in interdisciplinary research. Frequent collaborators include:

  • Marilena Frye
  • Torvald B. Egeland
  • Jarle Tryti Nordeide
  • Guro Lovise Hole Fisktjønmo
  • Bård-Jørgen Bårdsen

Folstad's work has appeared in specific academic venues such as:

  • Ecology and Evolution
  • Evolutionary Psychological Science

Best Publications

  • PARASITES, BRIGHT MALES, AND THE IMMUNOCOMPETENCE HANDICAP

    Ivar Folstad;Andrew John Karter

  • Cost of reproduction in a long-lived bird: incubation effort reduces immune function and future reproduction.

    Sveinn Are Hanssen;Dennis Hasselquist;Ivar Folstad;Kjell Einar Erikstad

  • Adaptive or Nonadaptive Immunosuppression by Sex Hormones

    Claus Wedekind;Ivar Folstad

  • Costs of immunity: immune responsiveness reduces survival in a vertebrate

    Sveinn Are Hanssen;Dennis Hasselquist;Ivar Folstad;Kjell Einar Erikstad;Kjell Einar Erikstad

  • Parasite avoidance: the cause of post-calving migrations in Rangifer?

    Ivar Folstad;Arne C. Nilssen;Odd Halvorsen;Johan Andersen

  • Rapid adjustments of sperm characteristics in relation to social status

    Geir Rudolfsen;Lars Figenschou;Ivar Folstad;Helge Tveiten

  • Sexual dichromatism and the immunocompetence handicap: an observational approach using Arctic charr

    Frode Skarstein;Ivar Folstad

  • Effects of ovarian fluid on sperm velocity in Arctic charr (Salvelinus alpinus)

    Davnah Urbach;Davnah Urbach;Ivar Folstad;Geir Rudolfsen

  • Why do male reindeer (Rangifer t. tarandus) have higher abundance of second and third instar larvae of Hypoderma tarandi than females

    Ivar Folstad;Arne C. Nilssen;Odd Halvorsen;Johan Andersen

  • Autumn colouration and herbivore resistance in mountain birch (Betula pubescens)

    Snorre B. Hagen;Ivar Folstad;Stein W. Jakobsen

  • Immune function and organochlorine pollutants in arctic breeding glaucous gulls

    JO Bustnes;SA Hanssen;I Folstad;KE Erikstad

  • Is male germ line control creating avenues for female choice

    Ivar Folstad;Prode Skarstein

  • Reduced immunocompetence and cost of reproduction in common eiders

    Sveinn Are Hanssen;Ivar Folstad;Kjell Einar Erikstad

  • Gastrointestinal nematodes depress food intake in naturally infected reindeer

    P. Arneberg;I. Folstad;A. J. Karter

  • Sexually selected color in male sticklebacks: a signal of both parasite exposure and parasite resistance?

    Ivar Folstad;Anne Mette Hope;Andrew Karter;Arne Skorping

  • Cod courtship song: a song at the expense of dance?

    Frode Engen;Ivar Folstad

  • Sperm velocity influence paternity in the Atlantic cod (Gadus morhua L.)

    Geir Rudolfsen;Lars Figenschou;Ivar Folstad;Oddmund Kleven

  • White plumage reflects individual quality in female eiders

    Sveinn Are Hanssen;Sveinn Are Hanssen;Ivar Folstad;Kjell Einar Erikstad;Kjell Einar Erikstad

  • Reindeer antlers: visual indicators of individual quality?

    Eystein Markusson;Ivar Folstad

  • REGULAR ARTICLES / ARTICLES RÉGULIERS Whether to reproduce or not: immune suppression and costs of parasites during reproduction in the Arctic charr

    Frode Skarstein;Ivar Folstad;Ståle Liljedal

  • Potential fitness benefits from mate selection in the Atlantic cod (Gadus morhua)

    G. Rudolfsen;L. Figenschou;I. Folstad;J. T. Nordeide

  • Male dimorphism, sperm traits and immunology in the corkwing wrasse (Symphodus melops L.)

    Ingebrigt Uglem;Trina Falck Galloway;Gunilla Rosenqvist;Ivar Folstad

  • Blood concentration of organochlorine pollutants and wing feather asymmetry in Glaucous Gulls

    J. O. Bustnes;I. Folstad;K. E. Erikstad;M. Fjeld

  • MHC and fertilization success in the Arctic charr (Salvelinus alpinus)

    Frode Skarstein;Ivar Folstad;Ståle Liljedal;Mats Grahn

  • Milt quality, parasites, and immune function in dominant and subordinate Arctic charr

    Ståle Liljedal;Ivar Folstad

  • Costs of parasites in common eiders: effects of antiparasite treatment

    Sveinn Are Hanssen;Ivar Folstad;Kjell Einar Erikstad;Antti Oksanen

  • Anti-parasite treatment removes negative effects of environmental pollutants on reproduction in an Arctic seabird

    Jan O Bustnes;Kjell E Erikstad;Sveinn A Hanssen;Sveinn A Hanssen;Torkild Tveraa

  • PARASITES, BRIGHT MALES, AND THE IMMUNOCOMPETENCE

    Ivar Folstad;Andrew John Karter

Frequent Co-Authors

Geir Rudolfsen
Geir Rudolfsen University of Tromsø - The Arctic University of Norway
Kjell Einar Erikstad
Kjell Einar Erikstad Norwegian Institute for Nature Research
Nigel G. Yoccoz
Nigel G. Yoccoz University of Tromsø - The Arctic University of Norway
Dennis Hasselquist
Dennis Hasselquist Lund University
Torkild Tveraa
Torkild Tveraa Norwegian Institute for Nature Research
Raul Primicerio
Raul Primicerio University of Tromsø - The Arctic University of Norway
Jan Ove Bustnes
Jan Ove Bustnes Norwegian Institute for Nature Research
Janneche Utne Skaare
Janneche Utne Skaare Norwegian University of Life Sciences
Arne Skorping
Arne Skorping University of Bergen
Oddmund Kleven
Oddmund Kleven Norwegian Institute for Nature Research

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