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Todd M. O'Hara

D-Index & Metrics

Ecology and Evolution

D-Index
50
Citations
7996
World Ranking
3897
National Ranking
1361

Todd M. O'Hara 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 Todd M. O'Hara 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: 160 publications — 58th percentile

58% of scientists in this discipline score the same or lower.

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

Todd M. O'Hara 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 Todd M. O'Hara 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: 50 D-Index — 56th percentile

56% of scientists in this discipline score the same or lower.

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

Overview

Todd M. O'Hara is affiliated with the University of Alaska Fairbanks in the United States. Their research primarily focuses on environmental science, with a strong emphasis on health, toxicology, and mutagenesis. Their work also spans ecology, nature and landscape conservation, oceanography, and atmospheric science.

Their research interests cover several specific topics, including:

  • Mercury impact and mitigation studies
  • Marine animal studies overview
  • Isotope analysis in ecology
  • Ichthyology and marine biology
  • Heavy metal exposure and toxicity
  • Ocean acidification effects and responses
  • Toxic organic pollutants impact

O'Hara has published extensively in journals such as The Science of The Total Environment, Marine Pollution Bulletin, and The Journal of Cetacean Research and Management (Special Issue). Other venues include the SSRN Electronic Journal and Environmental Toxicology and Chemistry.

Some of their recent publications include:

  • "Methyl mercury (MeHg) in vitro exposure alters mitogen-induced lymphocyte proliferation and cytokine expression in Steller sea lion (Eumetopias jubatus) pups" (2020, The Science of The Total Environment)
  • "Regional variations and drivers of mercury and selenium concentrations in Steller sea lions" (2020, The Science of The Total Environment)
  • "Contributions and perspectives of Indigenous Peoples to the study of mercury in the Arctic" (2022, The Science of The Total Environment)
  • "Sexual maturation in male bowhead whales (Balaena mysticetus) of the Bering-Chukchi-Beaufort Seas stock" (2023, The Journal of Cetacean Research and Management, Special Issue)
  • "Assessment of clinical outcomes associated with mercury concentrations in harbor seal pups (Phoca vitulina richardii) in central California" (2020, The Science of The Total Environment)

Frequent co-authors in their research include:

  • Lorrie D. Rea
  • J. Margaret Castellini
  • Brian S. Fadely
  • Daniela A. Murillo-Cisneros
  • Stephanie G. Crawford

Best Publications

  • What are the toxicological effects of mercury in Arctic biota

    Rune Dietz;Christian Sonne;Niladri Basu;Birgit Braune

  • Age and growth estimates of bowhead whales (Balaena mysticetus) via aspartic acid racemization

    John C George;Jeffrey Bada;Judith Zeh;Laura Scott

  • Effects of climate change on Arctic marine mammal health.

    Kathy A. Burek;Frances M. D. Gulland;Todd M. O'Hara

  • Trophic transfer of persistent organochlorine contaminants (OCs) within an Arctic marine food web from the southern Beaufort-Chukchi Seas.

    P.F. Hoekstra;T.M. O'Hara;A.T. Fisk;K. Borgå

  • Trophic relationships in an Arctic food web and implications for trace metal transfer

    Larissa-A. Dehn;Erich H. Follmann;Dana L. Thomas

  • Feeding ecology of phocid seals and some walrus in the Alaskan and Canadian Arctic as determined by stomach contents and stable isotope analysis

    Larissa-A. Dehn;Erich H. Follmann;Lawrence K. Duffy

  • Variation in winter diet of southern Beaufort Sea polar bears inferred from stable isotope analysis

    T.W. Bentzen;Erich H. Follmann;Steven C. Amstrup;G.S. York

  • The potential impact of climate change on infectious diseases of Arctic fauna

    Michael J. Bradley;Susan J. Kutz;Emily Jenkins;Todd M. O’Hara

  • Persistent organochlorine pollutants in ringed seals and polar bears collected from northern Alaska.

    John R Kucklick;William D.J Struntz;Paul R Becker;Geoff W York

  • Concentrations and interactions of selected essential and non-essential elements in bowhead and beluga whales of arctic Alaska.

    Victoria M. Woshner;Todd M. O'Hara;Gerald R. Bratton;Robert S. Suydam

  • Organochlorine contaminant exposure and associations with hematological and humoral immune functional assays with dam age as a factor in free-ranging northern fur seal pups (Callorhinus ursinus).

    Kimberlee B. Beckmen;John E. Blake;Gina M. Ylitalo;Jeffrey L. Stott

  • Trophic ecology of bowhead whales (Balaena mysticetus) compared with that of other arctic marine biota as interpreted from carbon-, nitrogen-, and sulfur-isotope signatures

    P. F. Hoekstra;L. A. Dehn;J. C. George;K. R. Solomon

  • Trace elements in tissues of phocid seals harvested in the Alaskan and Canadian Arctic: influence of age and feeding ecology

    Larissa-A Dehn;Erich H Follmann;Lawrence K Duffy

  • Factors affecting organochlorine contaminant concentrations in milk and blood of northern fur seal (Callorhinus ursinus) dams and pups from St. George Island, Alaska

    Kimberlee B. Beckmen;Gina M. Ylitalo;Rodney G. Towell;Margaret M. Krahn

  • Mercury, selenium and fish oils in marine food webs and implications for human health.

    Matthew O. Gribble;Roxanne Karimi;Beth J. Feingold;Jennifer F. Nyland

  • Morbillivirus and Toxoplasma exposure and association with hematological parameters for southern Beaufort Sea polar bears: potential response to infectious agents in a sentinel species.

    Cassandra M. Kirk;Steven C. Amstrup;Rhonda Swor;Darce Holcomb

  • Stable isotope and trace element status of subsistence-hunted bowhead and beluga whales in Alaska and gray whales in Chukotka

    Larissa-A. Dehn;Erich H. Follmann;Cheryl Rosa;Lawrence K. Duffy

  • Oxidative stress indicators and trace elements in the blue shark (Prionace glauca) off the east coast of the Mexican Pacific Ocean.

    Angélica Barrera-García;Todd O'Hara;Felipe Galván-Magaña;Lía C. Méndez-Rodríguez

  • Mercury and Selenium in Blood and Epidermis of Bottlenose Dolphins (Tursiops truncatus) from Sarasota Bay, FL: Interaction and Relevance to Life History and Hematologic Parameters

    Victoria Woshner;Katrina Knott;Randall Wells;Carla Willetto

  • Concentrations and interactions of selected essential and non-essential elements in ringed seals and polar bears of arctic Alaska.

    Victoria M. Woshner;Todd M. O'Hara;Gerald R. Bratton;Val R. Beasley

  • Trace element concentrations in the Pacific harbor seal (Phoca vitulina richardii) in central and northern California

    Tiffini J. Brookens;James T. Harvey;Todd M. O'Hara

Frequent Co-Authors

Derek C. G. Muir
Derek C. G. Muir Environment and Climate Change Canada
Felipe Galván-Magaña
Felipe Galván-Magaña Instituto Politécnico Nacional
Keith R. Solomon
Keith R. Solomon University of Guelph
Gina M. Ylitalo
Gina M. Ylitalo National Oceanic and Atmospheric Administration
Frances M. D. Gulland
Frances M. D. Gulland University of California, Davis
Steven C. Amstrup
Steven C. Amstrup United States Geological Survey
Randall S. Wells
Randall S. Wells Chicago Zoological Society
Sean Backus
Sean Backus Environment and Climate Change Canada
Margaret M. Krahn
Margaret M. Krahn National Oceanic and Atmospheric Administration
Matthew J. Wooller
Matthew J. Wooller University of Alaska Fairbanks

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Best Scientists Citing Todd M. O'Hara

Christian Sonne

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Rune Dietz

Rune Dietz

Aarhus University

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Derek C. G. Muir

Derek C. G. Muir

Environment and Climate Change Canada

Publications: 65

Robert J. Letcher

Robert J. Letcher

Carleton University

Publications: 59

Bjørn Munro Jenssen

Bjørn Munro Jenssen

Norwegian University of Science and Technology

Publications: 43

Gina M. Ylitalo

Gina M. Ylitalo

National Oceanic and Atmospheric Administration

Publications: 32

Aaron T. Fisk

Aaron T. Fisk

University of Windsor

Publications: 29

Melissa A. McKinney

Melissa A. McKinney

McGill University

Publications: 29

Steven H. Ferguson

Steven H. Ferguson

Fisheries and Oceans Canada

Publications: 28

Shinsuke Tanabe

Shinsuke Tanabe

Ehime University

Publications: 27

Geir W. Gabrielsen

Geir W. Gabrielsen

Norwegian Polar Institute

Publications: 26

Ursula Siebert

Ursula Siebert

University of Veterinary Medicine Hannover, Foundation

Publications: 26

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Katrine Borgå

University of Oslo

Publications: 26

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Andrew E. Derocher

University of Alberta

Publications: 26

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Paco Bustamante

University of La Rochelle

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Frank F. Rigét

Aarhus University

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