O'Hara, Todd


Dr. Todd O'Hara, DVM, Ph.D, A.B.V.T.

Professor of Veterinary Toxicology & Pharmacology, and Coordinator of Pre-Vet/Veterinary Student Services

Research and Education Mission (I):
Currently I oversee a teaching and research laboratory in a University setting that maintains senior personnel (e.g., Research Professional, Maggie Castellini) in close association with other professional colleagues to advance “One Health” research with a focus on ocean and human health that integrates undergraduate, graduate and professional students in this mission. We include colleagues from other countries across the Arctic and all of North America and research in Asia on non-human primates. Our research emphasizes work in toxicants (especially mercury) but incorporates the study of nutrients and infectious agents since we are holistic in our multidisciplinary approaches (One Health). Our research is evolving to better determine the use of marine vertebrates as sentinels for ecosystem health and links with human health via studies that include human subjects and the resources they depend on. This includes efforts to develop a Department of Veterinary Medicine with close ties to a well established biomedical sciences institution, the College of Veterinary Medicine and Biomedical Sciences at Colorado State University. 


Sep 1988 - May 1992  D.V.M. (Doctor of Veterinary Medicine)  University of  Wisconsin, School of Veterinary Medicine Madison, Wisconsin

Sep 1985 - Dec 1988  Ph.D. Pharmacology/Toxicology (Doctor of Philosophy)  The Medical College of Virginia, Richmond, Virginia  Thesis “A Study of the Carbon Tetrachloride-Chloroform Interaction in the Rat and Isolated Hepatocytes”   Advisor, Dr. Joseph F. Borzelleca.

Sep 1983 - May 1985  M.S. in Biology (Master of Science)  Villanova University, Villanova, Pennsylvania

Sep 1979 - May 1983  B.S. in Biology (Bachelor of Science) Vil lanova University, Villanova, Pennsylvania


December 2003 - Present                   Professor (tenured July, 2008; Full, since July, 2013) Interim Assoc. Dean Dept. of Vet. Med. (since July 2011) Department of Biology and Wildlife & Inst. of Arctic Biology, University of Alaska Fairbanks

February, 1995 – November, 2003     Research Biologist,  Department of Wildlife Management,         North Slope Borough

May, 1993 - January, 1995                 Assistant Professor, Toxicology, College of Veterinary Medicine, Mississippi State University

June, 1992 - April, 1993                      Wildlife Toxicologist, Wisconsin Department of Natural Resources, Bureau of Wildllife 


States of Alaska (#417) and Wisconsin (#3848-050).


Affiliate Associate Professor, Department of Chemistry & Biochemistry, Univ. of Alaska Fairbanks, since 2008.

Adjunct Associate Professor, University of Illinois at Urbana-Champaign, College of Veterinary Medicine, since 1995.

Adjunct Professor, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS, 39762-6100, since 1995.

Adjunct Professor, Department of Comparative Medicine, University of Washington, Seattle, WA, since 2006.

Affiliate Associate Professor, Colorado State University, College of Veterinary Medicine and Biomedical Sciences, Dept of Microbiology, Immunology & Pathology, since 2005.


PUBLICATIONS (past to most recent):

Key: (I)=international, undergraduate, graduate, Post Doc , O’Hara as *PhD or **DVM student

1.     Fariss, M.W., M.H. Merson, *T.M. O’Hara. 1989.  Alpha Tocopheryl-Succinate Protects Hepatocytes from Chemical-Induced Toxicity Under Physiological Calcium Conditions. Toxicology Letters 47:61-75. [ PMID: 2496490]

2.     * O’Hara , T.M., J.F. Borzelleca, E.C. Clarke, M.A. Sheppard, L.W. Condie. 1989. A Carbon Tetrachloride and Chloroform Interaction Study in Isolated Hepatocytes: Selection of a Vehicle.  Fundamental and Applied Toxicology 13: 605-615. [ PMID: 2612791]

 3.     Borzelleca, J.F., *T.M. O’Hara, C. Gennings, R.H. Granger, M.A. Sheppard, L.W. Condie.  1990. Interactions of Water Contaminants I. Plasma Enzyme Activity and Response Surface Methodology Following Gavage Administration of Carbon Tetrachloride and Chloroform or Trichloroethylene Singly and in Combination in the Rat. Fundamental and Applied Toxicology 14: 477-490. [ PMID: 2340978]

4.     * O’Hara , T.M., J.F. Borzelleca, E.C. Clarke, M.A. Sheppard, L.W. Condie. 1991. A Carbon Tetrachloride and Chloroform Interaction Study in Isolated Hepatocytes: Phenobarbital-induced and Metyrapone Pretreated Cells.  J of Applied Tox 11: 147-154. [ PMID: 2061553]

5.     Fairbrother, A., M. Fix, **T. O’Hara, C.A. Ribic. 1994. Impairment of Growth and Immune Function of Avocet Chicks from Sites with Elevated Arsenic, Selenium and Boron. Journal of Wildlife Diseases 30: 222-233.

6.     Elfarra, A.A., P.J. Sausen, R.J. Duescher, **T.M. O’Hara, A.J. Cooley. 1994. Methimazole Protection of Rats Against Gentamicin-Induced Nephrotoxicity. Canadian Journal of Physiology and Pharmacology 72: 1238-1244 [ PMID: 7882190]

7.     McCoy, C.P., T.M. O’Hara, L.W. Bennett, C. Boyle, B. Lynn. 1995. Liver and Kidney Concentrations of Zinc, Copper and Cadmium in Channel Catfish:  Variations Due to Size, Season and Health Status.  Veterinary and Human Toxicology 37: 11-15. [ PMID: 7709581]

8.     O’Hara , T. M., L. Bennett, C.P. McCoy, S.W. Jack, S. Fleming. 1995. Lead Poisoning and Toxicokinetics in a Heifer and Fetus Treated with EDTA and Thiamine. J. of Veterinary Diagnostic Investigation 7: 531-537. [ PMID: 8580178]

 9.     O’Hara , T.M., A. Azardpour, J. Lawton-Scheemaker, P. Gerard.  1997.  Oxytetracycline Residues in Channel Catfish:  A Feeding Trial. Veterinary and Human Toxicology 39: 65-70. [ PMID: 9080628]

10. O’Hara, T.M., C. House, J. House, R. Suydam, J.C. George.  1998.  Viral Serologic Survey of Bowhead Whales, J. Wildlife Disease 34: 39-46.

11. O’Hara, T.M., J. Dau, G. Carroll, J. Bevins, R. Zarnke. 1998. Evidence of Exposure to Brucella suis biovar 4 in Moose of Northern Alaska. Alces 34: 31-40.

12. Krone, C.A., P.A. Robisch, K.L. Tilbury, J.E. Stein, E.A. Mackey, P.R. Becker, T.M. O’Hara, L.M. Philo. 1999. Elements in Liver Tissues of Bowhead Whales (Balaena mysticetus). Marine Mammal Science 15: 123-142.

13.  Edmonds, M.D., F.M. Ward, T.M. O’Hara, P.H. Elzer. 1999. Use of Western Immunoblot Analysis for Testing Alaskan Moose (Alces alces) Serum for Brucella suis biovar 4 Specific Antibodies. Journal of Wildlife Diseases 35: 591-595 [ PMID: 10479098]

14. O'Hara, T., D. Dasher, J.C. George, and V. Woshner. 1999. Radionuclide Levels in Caribou of Northern Alaska in 1995-1996. Arctic 52 (3): 279-288.

15. (I) O’Hara, T.M., T.F. Albert, E.O. Øen, L.M. Philo, J.C. George, A.L. Ingling. 1999. The Role of Eskimo Hunters, Veterinarians, and Other Biologists in Improving the Efficiency of the Subsistence Harvest of Bowhead Whales. Journal of the American Veterinary Medical Association 214 (8): 1193-1198. [ PMID: 10212682]

16. O’Hara, T.M., M.M. Krahn, D. Boyd, P.R. Becker, L.M. Philo. 1999. Organochlorine Contaminant Levels in Eskimo Harvested Bowhead Whales of Arctic Alaska. Journal of Wildlife Diseases 35: 741-752. [ PMID: 10574534]

17. George, J.C., J. Bada, J. Zeh, L. Scott, S.E. Brown, T. O’Hara, and R. Suydam. 1999. Age and Growth Estimates of Bowhead Whales (Balaena mysticetus) Using Aspartic Acid Racemization. Canadian Journal of Zoology 77: 571-580.

18. Beckmen KB , Ylitalo GM, Towell RG, Krahn MM, O'Hara TM, Blake JE.  1999.  Factors affecting organochlorine contaminant concentrations in milk and blood of northern fur seal (Callorhinus ursinus) dams and pups from St. George Island, Alaska.  The Science of the Total Environment 231: 183-200. [ PMID: 10472134]

19.  (I) Krahn, M.M., D.G. Burrows, J.E. Stein, P.R. Becker, M.M. Schantz, D.C.G. Muir, T.M. O’Hara, T. Rowles. 1999. White whales from three Alaskan stocks- concentrations and patterns of persistent organochlorine contaminants in blubber. J. of Cetacean Res and Management 1: 239-250.

20. Cooper, L.W., I.L. Larsen, T.M. O’Hara, S. Dolvin, V. Woshner, G.F. Cota. 2000. Radionuclide contaminant burdens in arctic marine mammals harvested during subsistence hunting. Arctic 53: 174-182.

21. O’Hara, T.M., G. Carroll, P. Barboza, K. Mueller, J. Blake, V. Woshner, C. Willetto. 2001. Minerals and Heavy Metal Status as Related to a Mortality Event and Poor Recruitment in a Moose Population in Alaska. Journal of Wildlife Diseases 37(3): 509-522. [ PMID: 11504224]

22. Rosa, C; Blake, JE; O'Hara, TM; Monnier, V. 2001. Collagen aging in the bowhead whale (Balaena mysticetus). American Zoologist 41 6; 871

23. Woshner, V.M., T.M. O’Hara, G.R. Bratton, R.S. Suydam, and V.R. Beasley. 2001. Concentrations and interactions of selected essential and non-essential elements in bowhead and beluga whales of Arctic Alaska. Journal of Wildlife Diseases 37: 693-710. [ PMID: 11763733]

24. Woshner, V.M., T.M. O’Hara, G.R. Bratton, and V.R. Beasley. 2001. Concentrations and interactions of selected essential and non-essential elements in ringed seals and polar bears of Arctic Alaska. Journal of Wildlife Diseases 37: 711-721. [ PMID: 11763734]

25. Woshner, V.M., T.M. O’Hara, J.A. Eurell, M.A. Wallig, G.R. Bratton, V.R. Beasley, and R.S. Suydam. 2002. Distribution of Inorganic Mercury in Liver and Kidney of Beluga Whales, Compared to Bowhead Whales, Through Autometallographic Development of Light Microscopic Tissue Sections. Toxicologic Pathology 30 (2): 209-215

26. Kucklick, J.R., W.D.J. Struntz, P.R. Becker, G.W. York, T.M. O’Hara, and J.E. Bohonowych. 2002. Persistent organochlorine pollutants in ringed seals and polar bears collected from northern Alaska. The Science of the Total Environment. 287:45-59. [ PMID: 11885579]

27.  (I) Hoekstra, PF, O'Hara, TM, Teixeira, C, Backus, S, Fisk, AT, and Muir, DCG. 2002.  Spatial trends and bioaccumulation of organochlorine pollutants in marine zooplankton from the Alaskan and Canadian Arctic. Environmental Toxicology and Chemistry 21(3): 575-583 [ PMID: 11883415]

28.  Siefker, C., L.G. Rickard, G.T. Pharr, J.A. Simmons, and T.M. O'Hara, 2002 Molecular characterization of Cryptosporidium sp. isolated from northern Alaskan caribou (Rangifer tarandus). Journal of Parasitology 88(1): 213-216. [ PMID: 12053974]

29.  (I) Hoekstra, P.F., O'Hara, T.M., Pallant, S., Solomon, K.R., and Muir, D.C.G. 2002. Bioaccumulation of organochlorine contaminants in bowhead whales (Balaena mysticetus) from Barrow, Alaska. Archives of Environmental Contamination and Toxicology 42 (4): 497-507 [ PMID: 11994792]

30. (I) Hoekstra, P.F., Dehn, L.A., George, J.C., Muir, D., & O’Hara, T.M. 2002. Trophic ecology of bowhead whales (B. mysticetus) compared to other arctic marine biota as interpreted from C, N, and S isotope signatures. Canadian Journal of Zoology 80 (2): 223-231

31.  (I) Hoekstra, P.F., Wong, C.S., O'Hara, T.M., Solomon, K.R., S. Mabury and Muir, D.C.G.  2002. Enantiomer-specific accumulation of PCB atropisomers in the bowhead whale (B. mysticetus).  Environmental Science and Technology 36 (7): 1419-1425 [ PMID: 11999046]

32. Miller, D. L., G. D. Bossart, M. Nadji, R. Tarpley, B. Roberts, T.M. O’Hara. 2002. Histologic and immunohistochemical identification of Leydig and Sertoli cells in bowhead whales (Balaena mysticetus). Journal of Cetacean Research and Management 4(2):149-153

33. O’Hara, T.M., George, J.C., Tarpley, R. J., Burek, K , and Suydam, R.S. 2002. Sexual maturation in male bowhead whales (Balaena mysticetus) of the Bering Sea stock. Journal of Cetacean Research and Management 4(2):143-148

34. (I) Tittlemier, S., Borrell, A., Duffe, J., Duignan, P.J.,Fair, P., Hall, A., Hoekstra, P., Kovacs, K.M., Krahn, M.M., Lebeuf, M., Lydersen, C., Muir, D., O'Hara, T., Olsson, M., Pranschke, J., Ross, P., Siebert, U., Stern, G., Tanabe, S., and R. Norstrom:  2002. Global distribution of halogenated dimethyl bipyrroles in marine mammal blubber.  Archives of Environmental Contamination and Toxicology 43 (2): 244-255.

35. O'Hara, T.M., J.C. George, J. Blake, K. Burek, G. Carroll, J. Dau, L. Bennett, C.P. McCoy, P. Gerard, V. Woshner. 2003. Investigation of Heavy Metals in a Large Mortality Event in Caribou of Northern Alaska. Arctic 56 (2): 125-135

36. (I) Hoekstra, P.F., Braune, B.M., O’Hara, T.M., Elkin, B., Solomon, K.R., Muir, D.C.G. 2003. Organochlorine contaminant and stable isotope profiles in arctic fox (Alopex lagopus) from the Alaskan and Canadian Arctic. Environmental Pollution 122 (issue 3, April):  423-433 [ PMID: 12547532]

37. (I) Hoekstra, P.F., Letcher, R.J., O’Hara, T.M., Backus, S.M., Solomon, K.R. and Muir, D.C.G. 2003. Hydroxylated and methylsulfone-containing metabolites of PCBs in the plasma and blubber of bowhead whales (Balaena mysticetus). Environmental Toxicology and Chemistry: 22(11): p. 2650-2658. [ PMID: 14587904]

38. (I) Hoekstra, P.F., O’Hara, T.M., Fisk, A.T., Borgå, K, Solomon, K.R., and Muir, D.C.G. 2003. Trophic transfer of persistent organochlorine contaminants (OCs) within an arctic marine food web from the southern Beaufort-Chukchi Seas near Barrow, Alaska. Environmental Pollution 124 (issue 3, August): 509-522. [ PMID: 12758030]

39. Beckmen, K.B., J.E. Blake, G.M. Ylitalo, J.L. Stott, and T.M. O’Hara. 2003. 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). Marine Pollution Bulletin 46 issue 5: 594–606. [ PMID: 12735957]

40. (I) Hoekstra, P.F., O’Hara, T.M., Karlsson, H., Solomon, K.R., and D.C.G. Muir. 2003. Enantiomer-specific biomagnification of alpha-hexachlorocyclohexane and selected chiral chlordane-related compounds in an arctic marine food web. Environmental Toxicology and Chemistry: Vol. 22, No. 10, pp. 2482–2491. [ PMID: 14552014]

41. Kenny, D.E., T.M. O'Hara, T.C. Chen, Z. Lu, X. Tian, M.F. Holick. 2004. Vitamin D content in Alaskan Arctic zooplankton, fishes, and marine mammals. Zoo Biology 23 1 (Feb):33-43

42.  Elsner, R., J. George, T. O’Hara. 2004. Vasomotor responses of isolated peripheral blood vessels from bowhead whales: Thermoregulatory implications. Mar Mam Sci 20 (3): 546-553

43. (I) Hoekstra, P.F., O’Hara, T.M., Backus, S.M., Hanns, C., and Muir, D.C.G.  2005. Concentrations of persistent organochlorine contaminants in bowhead whale tissues and other biota from northern Alaska: Implications to human exposure from a subsistence diet. Environmental Research 98 (3): 329-340 [ PMID: 15910787]

44. Holt, D.W., C. Hanns, T. O'Hara, K. Burek, and R. Frantz 2005.  New Distribution Records of Echinococcus multilocularis in the Brown Lemming from Barrow, Alaska USA. J. of Wildlife Diseases 41(1): 257-259

45. Dehn L-A, Sheffield G, Follmann EH, Duffy LK, Thomas DL, Bratton GR, Taylor RJ, O'Hara TM. 2005. Trace elements in tissues of phocid seals harvested in the Alaskan and Canadian Arctic – Influence of age and feeding ecology. Canadian Journal of Zoology 83 (5): 726-746

46. Hughes-Hanks, J. M., L. G. Rickard, C. Panuska, J. R. Saucier, T. M. O’Hara, L. Dehn, and R. M. Rolland. 2005. Prevalence of Cryptosporidium spp. and Giardia spp. in Five Marine Mammal Species. J. of Parasitology 91: 1225-1228 [ PMID: 16419775]

47. (I) O’Hara, T., Hoekstra, P.F., Hanns, C., Backus, S.M., and D.C.G. Muir. 2005. Concentrations of selected persistent organochlorine contaminants in store bought foods from northern Alaska: Human exposure implications.  International Journal of Circumpolar Health 64 (4): 303-313 [ PMID: 16277115]

48. (I) Riget, F., D. Muir, M. Kwan, T. Savinova, M. Nyman, V. Woshner, T. O’Hara. 2005. Circumpolar pattern of mercury and cadmium in ringed seals. Science of the Total Environment 351–352: 312– 322

49.  Bradley, M., S. Kutz, E. Jenkin, T. O’Hara. 2005. The Potential Impact of Climate Change on Infectious Diseases of Arctic Fauna.  Int J. Circumpolar Health 2005; 64(5): 468-478.

50. Reynolds, J., D. Wetzel, and T. O’Hara. 2006. Human health implications of omega-3 and omega-6 fatty acids in bowhead whale (B. mysticetus) blubber. Arctic 59 (2): 155-164

51. Dehn L-A, Follmann EH, Thomas DL, Sheffield, G.G., Rosa C, Duffy LK, O’Hara TM. 2006. Trophic relationships in an Arctic food web and implications for trace metal transfer. Science of the Total Environment 362: 103–123 [ PMID: 16387350]

52. Dehn L-A, Follmann EH, Rosa C, Duffy LK, Thomas DL, Bratton GR, Taylor RJ, O’Hara TM. 2006. Stable isotope and trace element status of subsistence hunted bowhead (Balaena mysticetus) and beluga whales (Delphinapterus leucas) in Alaska and gray whales (Eschrichtius robustus) in Chukotka. Marine Pollution Bulletin 52: 301–319

53. O’Hara, T. M., C. Hanns, G. Bratton, R. Taylor, V.M. Woshner. 2006. Essential and non-essential elements in eight tissue types from subsistence hunted bowhead whale: Nutritional and toxicological assessment. Int J Circumpolar Health 65 (3): 228-242 [ PMID: 16871829]

54. Kucklick, J.R., M.M. Krahn, P.R. Becker, B.J. Porter, M.M. Schantz, G.S. York, T.M. O’Hara, S.A. Wise. 2006. Persistent organic pollutants in Alaskan ringed seal (Phoca hispida) and walrus (Odobenus rosmarus) blubber. Journal of Environmental Monitoring, 8, 848–854

55. Godard, C.A.J., S.S. Wise, R.S. Kelly, B. Goodale, S. Kraus, T. Romano, T. O’Hara & J.P. Wise Sr. 2006. Benzo[a]pyrene cytotoxicity in right whale (Eubalaena glacialis) skin, testis and lung cell lines. Environmental Research 62: S20-S24

56. Brookens, T.J., J.T. Harvey, and T.M. O’Hara. 2007. Trace element concentrations in the Pacific harbor seal, Phoca vitulina richardii, in central and northern California: influence of age, sex, and trophic level. Science of the Total Environment 372: 676–692

57. Dehn, L., G.G. Sheffield, E.H. Follmann, L.K. Duffy, D.L. Thomas, T.M. O’Hara. 2007. Feeding ecology of phocid seals and some walrus in the Alaskan and Canadian Arctic as determined by stomach contents and stable isotope analysis. Polar Biol 30:167–181

58. (I) Rosa, C., T.M. O’Hara, P. Hoekstra, K. Refsal J.E. Blake. 2007. Serum thyroid hormone concentrations and thyroid histomorphology as biomarkers in bowhead whales (Balaena mysticetus). Canadian Journal of Zoology 85: 609-618.

59. (I) Rosa, C., Blake, J.E., L. Mazzaro, P. Hoekstra, G.M.Ylitalo, T.M. O’Hara. 2007. Vitamin A and E tissue distribution with comparisons to organochlorine concentrations in the serum, blubber and liver of the bowhead whale (Balaena mysticetus) Comparative Biochemistry and Physiology. Part B 148: 454-462 [ PMID: 17936661]

60. Bentzen, T.W., E.H. Follmann, S.C. Amstrup, G.W. York, M.J. Wooller and T.M. O’Hara. 2007. Variation in winter feeding ecology of southern Beaufort Sea polar bears inferred from stable isotope analysis. Canadian Journal of Zoology 85: 596-608

61. Brookens, T.J., T.M. O’Hara, R.J. Taylor, G.R. Bratton, J.T. Harvey. 2008. Body burden assessment of total mercury in the Pacific harbor seal, Phoca vitulina richardii, pup from central California. Marine Pollution Bulletin 56: 27-41. [ PMID: 18061626]

62. Wise, J.P. Sr., S.S. Wise, S. Kraus, F. Shaffiey, M. Grau, T.L. Chen, C. Perkins, W.D. Thompson, T. Zheng, Y. Zhang, T. Romano, T. O’Hara. 2008. Hexavalent Chromium Is Cytotoxic and Genotoxic to the North Atlantic Right Whale (Eubalaena glacialis) Lung and Testes Fibroblasts. Mutation Research 650: 30–38

63. Bentzen, T.W., E.H. Follmann, M.J. Wooller, D.C.G. Muir, S.C. Amstrup, G.W. York and T. M. O’Hara. 2008. Dietary biomagnification of organochlorine contaminants in Alaskan polar bears. Canadian Journal of Zoology 86: 177-191

64. Woshner V, Knott K, Wells R, Willetto C, Swor R, and O’Hara T. 2008. 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. EcoHealth 5(1): 1-11

65. Burek, K.A., F.M.D. Gulland, T.M. O'Hara 2008."Effects of Climate Change on Arctic Marine Mammal Health" In Assessing the Impacts of Climate Change on Arctic Marine Mammals, Special Issue Marine Mammal Commission (US); Huntington, H. and Moore, S. (Editors) Ecological Applications 18(2): S126–S134 [ PMID: 18494366]

66. Bentzen, T., D. Muir, E. Follmann, S. Amstrup, G. York, and T. O’Hara. 2008. Organohalogen concentrations in blood and adipose tissue of polar bears along Alaska’s Beaufort Sea coast. Science of the Total Environment 406 (1-2): 352-367 [ PMID: 18775556 ]

67. Rosa, C., Blake, J.E., Bratton, G.R., Dehn, L-A., Gray, M.J., O’Hara, T.M. 2008. Heavy metal and mineral concentrations and their relationship to histopathological findings in the bowhead whale. Science of the Total Environment 399 (2008) 165–178 [ PMID: 18466957]

68. O’Hara, T.M., C. Hanns, V.M. Woshner, J. Zeh, G. Bratton, R. Taylor. 2008. Essential and non-essential elements of the subsistence hunted bowhead whale: Epidermis-based predictions of blubber, kidney, liver and muscle tissue concentrations. J. of Cetacean Research and Management 10(2): 107-117

69. Moses, SK. AV. Whiting, GR. Bratton, RJ. Taylor, TM. O’Hara. 2009. Inorganic nutrients and contaminants in spotted seals (Phoca largha) and sheefish (Stenodus leucicthys) of NW Alaska: Linking the health of arctic wildlife and subsistence users. International Journal of Circumpolar Health 68(1):53–74 [NIHMSID: 107485; PMID: 19331242]

70. Cardona-Marek, T., K. K. Knott, B. E. Meyer, T. M. O’Hara. 2009. Mercury Concentrations in Southern Beaufort Sea Polar Bears: Variation Based on Stable Isotopes of Carbon and Nitrogen. Environmental Toxicology and Chemistry 28 (7): 1416-1424 [ PMID: 19226182]

71. L. Chen, Tânia, S.S. Wise, S. Kraus, F. Shaffiey, K.M. Levine, W. D. Thompson, T. Romano, T. O’Hara and J. P. Wise Sr. 2009. Particulate Hexavalent Chromium Is Cytotoxic and Genotoxic to the North Atlantic Right Whale (Eubalaena glacialis) Lung and Skin Fibroblasts. Environmental and Molecular Mutagenesis 50(5):387-93.

72. (I) Moses, S., A. Whiting, D. Muir, X. Wang, T. O’Hara. 2009. Organic nutrients and contaminants in subsistence species of Alaska: Concentrations and relationship to food preparation method. International J. of Circumpolar Health 68(4):354-371 [NIHMS149830]73.

73. Engel, G., T.M. O'Hara, T. Cardona-Marek, J. Heidrich, M. K. Chalise, R. Kyes, L. Jones-Engel. 2010. Synanthropic primates in Asia: Potential sentinels for environmental toxins. American Journal of Physical Anthropology 142:453–460

74. O’Hara, T., D. Holcomb, P. Elzer, J. Estepp, Q. Perry, S. Hagius, C. Kirk. 2010. Brucella Species Survey in Polar Bears (U. maritimus) of Northern Alaska. J. Wild Dis. 46(3):687-94

75. Kirk, C.M ., S. Amstrup, R. Swor, D. Holcomb , T.M. O’Hara. 2010. Morbillivirus and Toxoplasma Exposure and Association with Hematological Parameters for Southern Beaufort Sea Polar Bears: Potential Response to Infectious Agents in a Sentinel Species . EcoHealth. 7(3):321-31

76. Kirk, C.M., S. Amstrup, Rhonda Swor, D. Holcomb, T.M. O’Hara. 2010. Hematology of Southern Beaufort Sea Polar Bears (2005-2007): Biomarker for an Arctic Ecosystem Health Sentinel. EcoHealth. 7(3):307-20

77. Hueffer, K., C.  Lieske, L. McGilvary, R. Hare, D. Miller, T. O'Hara. 2011. Streptococcus phocae isolated from a spotted seal (Phoca largha) with pyometra in Alaska. Journal of Zoo and Wildlife Medicine 42(1): 108–112

78. Bernhardt, R., F.A. von Hippel, T.M. O’Hara. 2011. Chronic Perchlorate Exposure Causes Morphological Abnormalities in Developing Stickleback. Env. Tox. and Chem, 30(6):1468-78

79. Schillaci, M.A., B.P. Y-H. Lee, J. M. Castellini, M.J.C. Reid, T.M. O’Hara. 2011. Lead Levels in Singapore’s Long-tailed Macaques (Macaca fascicularis). Primates, Apr; 52(2):163-70

80. Hueffer, K., T.M. O’Hara, E.H. Follmann. 2011. Adaptation of Mammalian Host-Pathogen Interactions in a Changing Arctic Environment. Acta Veterinaria Scandinavica 53:17 http://www.actavetscand.com/content/53/1/17

81. Hueffer, K, D Holcomb, L Ballweber, S Gende, G Blundell, T O’Hara. 2011. Serological surveillance of multiple pathogens in a declining harbor seal (P. vitulina) population in Glacier Bay National Park, Alaska, USA and a Reference Site. J. of Wild Dis 47(4): 984-988

82. Knott, K., Boyd, D., Ylitalo, G., O’Hara, T. 2011. Concentrations of mercury and polychlorinated biphenyls in blood of Southern Beaufort Sea polar bears (U maritimus) during spring: Variations with lipids and stable isotope values (δ15N, δ13C). Can. J. of Zoology 89(11): 999-1012

83. Miller, D., V. Woshner, E.L. Styer, S. Ferguson, M. Gray, K. Knott, R. Wells, and T. O'Hara. 2011. Histological findings in free ranging Sarasota Bay Bottlenose Dolphin Skin: Mercury, Selenium and Seasonal Factors. J. of Wildlife Diseases 47(4): 1012-1018

84. Knott, K., Schenk, P., Beyerlein, S., Boyd, D., Ylitalo, G., O’Hara, T. 2011. Blood-based biomarkers of selenium and thyroid status indicate possible adverse biological effects of mercury and polychlorinated biphenyls in Southern Beaufort Sea polar bears. Env Res 111: 1124-1136

85. Lieske, C., S. Moses, J M. Castellini, K. Hueffer, T. O’Hara. 2011. Toxicokinetics of Total Mercury in Canine Blood. Acta Veterinaria Scandinavica. 53:66 doi:10.1186/1751-0147-53-66 Published: 7 Dec 2011 PMID: 22152014

86. Van Hemert , C., C.M. Handel, John E. Blake, R.M. Swor, T.M. O’Hara. 2012. Microanatomy of Passerine Hard-cornified Tissues:  Beak and Claw Structure of the Black-capped Chickadee (Poecile atricapillus). Journal of Morphology. 273(2):226-40.

87. Van Hemert, C., C.M. Handel, T.M. O’Hara. 2012. Evidence of Accelerated Beak Growth Associated with Avian Keratin Disorder in Black- Capped Chickadees (Poecile atricapillus). Journal of Wildlife Diseases. 48 (July):686-694

88. Knott, K.K., D. Boyd, G. Ylitalo, T.M. O’Hara. 2012. Lactational transfer of mercury and polychlorinated biphenyls in polar bears. Chemosphere 88 (July): 395–402

89. (I) Barrera-García, A., T.M. O’Hara, F. Galván-Magaña, L.C. Méndez-Rodríguez, J.M. Castellini, T. Zenteno-Savín. 2012. Oxidative stress indicators and trace elements in the blue shark (Prionace glauca) off the east coast of the Mexican Pacific Ocean. Comparative Biochemistry and Physiolog y, Part C 156 (July): 59–66

90. Castellini, J.M, L.D. Rea, C.L. Lieske, K.B. Beckmen, B.S. Fadely, J.M. Maniscalco and T.M. O’Hara.  2012. Mercury concentrations in hair from neonatal and juvenile Steller sea lions: implications based on age and region in this Northern Pacific marine sentinel piscivore. EcoHealth. Volume 9, Issue 3 (Sept, 2012), Page 267-277

91. McHuron, E.A ., J.T. Harvey, J. M. Castellini, and T.M. O’Hara. 2012. Hair sampling location in harbor seals (Phoca vitulina) affects selenium and mercury concentrations: implications for study design of trace element determination in pinnipeds. Mar. Pollut. Bull., http://dx.doi.org/10.1016/j.marpolbul.2012.08.027

92. Kenney, Leah A., Frank A. von Hippel, James J. Willacker, Todd M. O'Hara. 2012. Mercury concentrations of a resident freshwater forage fish at Adak Island, Aleutian archipelago, Alaska. Environmental Toxicology & Chemistry 31 ( 11): 2647–2652

93. Rosa, Cheryl; Zeh, Judy; George, Craig; Bada, Jeffrey; Botta, Oliver; Zauscher, Melanie; O'Hara, Todd. 2013. Age estimates based on aspartic acid racemization for bowhead whales (Balaena mysticetus) harvested in 1998-2000 and the relationship between racemization rate and body temperature. Marine Mammal Science , 29(3): 424–445

94. Van Hemert, C., A. Medianero, A. Guillermo; Blake, J.; Handel, C.; O'Hara, T. 2013. Macroscopic, histologic, and ultrastructural lesions associated with “avian keratin disorder” in Black-capped Chickadees (Poecile atricapillus). Veterinary Pathology. February 11, 2013 as doi:10.1177/0300985812469637

95. (I) Dietz, R., C. Sonne, B. Braune, N. Basu, T. O’Hara, et al. 2013. What are the Toxicological Effects of Mercury in Arctic Biota? Science of the Total Environment. 443: 775–790

96. Hueffer , K., S.M. Gende and T.M. O’Hara. 2013. Assay dependence of Brucella antibody prevalence in a declining Alaskan harbor seal (Phoca vitulina) population Acta Veterinaria Scandinavica 55:2 doi:10.1186/1751-0147-55-2

97. Zenteno-Savin, T., Tenorio-Rodriguez, P.A., L.C. Mendez-Rodriguez, E. Serviere-Zaragoza, T. O'Hara. 2013. Antioxidant Substances and Trace Element Content in Macroalgae from a Subtropical Lagoon in the West Coast of the Baja California Peninsula. Vitam Trace Elem 2:108. doi:10.4172/2167-0390.1000108

98. Willacker, J.J. , F.A. von Hippel, K.L. Ackerly, and T.M. O’Hara. 2013. Habitat-specific foraging and sex determine mercury concentrations in sympatric benthic and limnetic ecotypes of threespine stickleback . Environmental Toxicology & Chemistry Vol. 32, No. 7, pp. 1623–1630

99. Rea, L.D., J.M. Castellini, L. Correa, B.S. Fadely, T.M. O’Hara. 2013. Maternal Steller sea lion diets elevate fetal mercury concentrations in an area of population decline. Science of the Total Environment 454-455: 277–282

100. Schillaci, M.A., J. M. Castellini, C.A. Stricker, L. Jones-Engel, B. P. Y.-H. Lee, T.M. O’Hara. 2013. Variation in hair δ13C and δ15N values in long-tailed macaques (Macaca fascicularis) from Singapore. Primates. DOI 10.1007/s10329-013-0361-7

101. (I) Barrera-García, A., T.M. O’Hara, F. Galván-Magaña, L.C. Méndez-Rodríguez, J.M. Castellini, T. Zenteno-Savín. 2013. Trace elements and oxidative stress indicators in liver and kidney of the blue shark (Prionace glauca). Comp Biochem Physiol A Mol Integr Physiol. ;165(4):483-90

102. Correa, L., J. M. Castellini, R.S. Wells, T. O’Hara. 2013. Distribution of mercury and selenium in blood compartments of bottlenose dolphins (Tursiops truncatus) from Sarasota Bay, Florida. Environmental Toxicology and Chemistry. DOI: 10.1002/etc.2327 . PMID: 23861289

103. Furin, C.; von Hippel, F.; Hagedorn, B.; O'Hara, T. 2013. Perchlorate trophic transfer increases tissue concentrations above ambient water exposure alone in a predatory fish. Journal of Toxicology and Environmental Health, Part A: Current Issues. 76:18, 1072-1084, DOI: 10.1080/15287394.2013.836693

104. McGrew, A.K ., L.R. Ballweber, S.K. Moses, C.A. Stricker, K.B. Beckmen, M.D. Salman, and T.M. O’Hara. 2014. Mercury in gray wolves (Canis lupus) in Alaska: Increased exposure through consumption of marine prey. Science of the Total Environment. Volumes 468–469 , 15 January: 609–61 NIHMS520283

105. van Wijngaarden E, Harrington D, Kobrosly R, Thurston SW, O’Hara T, McSorley EM, Myers GJ, Watson GE, Shamlaye CF, Strain J, Davidson PW. 2014. Prenatal exposure to methylmercury & LCPUFA in relation to birth weight. Annals of Epidemiology, 24 (4): 273-8 

106.  Correa, L., L.D. Rea, R. Bentzen, T. O'Hara. 2014. Assessment of mercury and selenium tissular concentrations and total mercury body burden in 6 Steller sea lion pups from the Aleutian Islands. Marine Pollution Bulletin 82 (2014) 175–182

107. Hansen, C.M., K. Hueffer, F. Gulland, R.S. Wells, B.C. Balmer, J.M. Castellini, T. O’Hara. 2014. Use of Cellulose Filter Paper to Quantify Whole-Blood Mercury in Two Marine Mammals: Validation Study. Journal of Wildlife Diseases, 50(2): 271-278.

108. Bentzen, T. W., R. T. Shideler, T. M. O’Hara. In Press. Use of stable isotope analysis to identify food conditioned grizzly bears on Alaska's North Slope. URSUS. 25(1):14-23. 2014

109. McHuron, E.A., Harvey, J.T., Castellini, J.M., Stricker, C.A., O'Hara, T.M. 2014. Selenium and mercury concentrations in harbor seals (Phoca vitulina) from central California: Health implications in an urbanized estuary. Marine Pollution Bulletin. http://dx.doi.org/10.1016/j.marpolbul.2014.04.031

PUBLICATIONS (Accepted/Submitted)

110. Lieske, C.L., S. Bhojwani, J.M. Castellini, A. Lopez, T.M. O’Hara. Mercury and methylmercury distribution in tissues of Alaskan sculpin species. Submitted to Polar Biology

Back to Top