INBRE
INBRE

Todd O'Hara

Professor and Associate Dean Department of Veterinary Medicine

University of Alaska Fairbanks
PO Box 757000
Fairbanks, Alaska 99775
907-474-1838
 
Affiliations
● Alaska INBRE
   (IDeA Network of Biomedical Research Excellence)
● Center for Alaska Native Health Research (CANHR)
University of Alaska Fairbanks (UAF)
   Department of Biology and Wildlife
   Institute of Arctic Biology
● Affiliate faculty Department of Chemistry and Biochemistry (UAF)
 
Specialties
● Toxicology
● Wildlife Diseases
● Environmental Contaminants
● Food quality and safety
 
Education
●B.S. 1983 and M.S. 1985 in Biology
   Villanova University, Villanova, PA
Ph.D. 1988 Pharmacology/Toxicology
   Medical College of Virginia, Richmond, VA
● D.V.M. 1992 University of Wisconsin, Madison, WI
 
Research Overview
Wildlife health with a focus on toxicology of marine fish and mammals and subsistence use foods (Public Health) and associated human health (Ocean and Human Health, One Health).
 
Current Research Projects
● Arctic Marine Mammal Contaminants and Feeding Ecology
Alaska Pinnipeds Contaminants Ecology
Contaminants and Nutrients in Alaska Subsistence Foods
Drivers of Accumulation and Bioavailability of Hg in the Piscivores
● Use of canine animal models in environmental agents of disease research
 
Current Students
Graduate Students (advisor, co-advisor, or active member of the WTL)
1. Katrina Knott (Ph.D. candidate), University of Alaska Fairbanks, Institute of Arctic Biology and Department of Biology and Wildlife (advisor), “Impacts of contaminants on arctic fox and polar bears.” (anticipated graduation Spring 2012)
 
2. Christoff "Buck" Furin (Ph.D. candidate), based at University of Alaska Anchorage, University of Alaska Fairbanks, Department of Biology and Wildlife, “Effects of Perchlorate on Stickleback Fish” (co-advisor with Dr. Frank Von Hippel). 
 
3. Darce Holcomb (M.S. student), University of Alaska Fairbanks, Institute of Arctic Biology and Department of Biology and Wildlife (advisor), “Health Assessment of the Glacier Bay National Park Harbor Seals.” 
 
4. Caroline R Van Hemert (Ph.D. candidate), University of Alaska Fairbanks, Institute of Arctic Biology and Department of Biology and Wildlife (co-advisor with Diane O’Brien), “Assessment of Beak Deformities in Birds of Southeast Alaska.” (anticipated graduation Spring 2012)
 
5. Rebekah Hare-Sanford, University of Alaska Fairbanks, Institute of Arctic Biology and Department of Biology and Wildlife, “Translocation and localization of Francisella tularensis effector proteins encoded within the Francisella pathogenicity island that are secreted within an arthropod host cell.” (Comm Member) (graduation fall 2011, advisor Karsten Hueffer)
 
6. Mary-Cathrine Lewis, University of Alaska Fairbanks, Institute of Arctic Biology and Department of Biology and Wildlife, “Microbial degradation of organic pollutants and the possible impact of Alaskan plant secondary compounds to the degradation process” (Comm Member) (graduation fall 2012, advisor Mary Beth Leigh)
 
7.  Ashley Linton (DVM, PhD student). College of Veterinary Medicine, Colorado State University. Thesis: Toxicoparasitology of Hg and piscivory: an assessment of gastrointestinal parasitism and its role in Hg absorption and biotransformation as it relates to the health of a phocid host. (UAF-based advisor) (graduation fall 2012, CSU advisor Dr. Lora Ballweber)
 
8.  James Willacker, (Ph.D. student), based at University of Alaska Anchorage, University of Alaska Fairbanks, Department of Biology and Wildlife, “Ecotoxicology of Mercury in the Stickleback Fish” (advisor Dr. Frank Von Hippel). (anticipated graduation fall 2014)
 
9. Angélica Barrera-García (Ph.D. student), Centro de Investigasiones Biologicas del Noroeste CIBNOR, La Paz, México, Tania Zenteno-Savín (La Paz advisor), Elasmobranchii Metal Toxicology(UAF-based advisor)
 
10. Bonita Dainowski (Ph.D. student), "Temporal Trends of Hg and Chemical Feeding Ecology from Precontact to Today: Method development using and interpreting hard tissues" (advisor, anticipated graduation fall 2014)
 
Undergraduate Students (currently in laboratory)
 
1.  Lucero “Lucy” Correa, research assistant with focused independent projects on “Mercury and selenium distribution in blood compartments of bottlenose dolphin (Tursiops truncatus) from Sarasota Bay, FL.” and use of hair and blood to assess essential and non-essential status of SE Asia primates.
 
2.  Gabrielle Johnson, research assistant with focused subsistence foods projects related to CANHR.
 
3.  Jessica Klejka research assistant with focused independent project on “Using hair as an Indicator of Mercury Exposure in Sled Dogs.”
 
 
Publications
Peer Reviewed Publications
 
1.  M.W. Fariss, 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.  T.M. O’Hara, 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.  T.M. O’Hara, 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.  A. Fairbrother, 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.  A.A. Elfarra, 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.  C.P. McCoy, 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.  T. M. O’Hara, 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.  T.M. O’Hara, 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. T.M. O’Hara, C. House, J. House, R. Suydam, J.C. George. 1998. Viral Serologic Survey of Bowhead Whales, J. Wildlife Disease 34: 39-46.
 
11. T.M. O’Hara, 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. 1998. 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. 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. 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 Research 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 vol. 37, no. 3: 509-522. [ PMID: 11504224]
 
22. Kucklick, J.R., W.D.J. Struntz, P.R. Becker, G.W. York, T.M. O’Hara, and J.E. Bohonowych. 2001. Persistent organochlorine pollutants in ringed seals and polar bears collected from northern Alaska. The Science of the Total Environment. 287:45-59. [ PMID: 11885579]
 
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. Rosa, C; Blake, JE; O'Hara, TM; Monnier, V. 2001. Collagen aging in the bowhead whale (Balaena mysticetus). American Zoologist 41 6; 871
 
27. 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. 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. Hoekstra, P.F., Dehn, L.A., George, J.C., Muir, D.C.G., and O’Hara, T.M. 2002. Trophic ecology of bowhead whales (Balaena 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. 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 (Balaena 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. 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. 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. 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. 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 (2003): 594–606. [ PMID: 12735957]
 
40. Hoekstra, P.F., O’Hara, T.M., Karlsson, H., Solomon, K.R., and D.C.G. Muir. 2003. Enantiomer-specific biomagnification of -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.C. George, T. O’Hara. 2004. Vasomotor responses of isolated peripheral blood vessels from bowhead whales: Thermoregulatory implications. Marine Mammal Science vol. 20, no. 3: 546-553
 
43. 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]
 
 
45. Dehn L-A, Sheffield GG, 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 Vol 83, No. 5, 1: 726-746(21)
 
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 Parasitolgy 91: 1225-1228 [ PMID: 16419775]
 
47. 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. 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. Reynolds, J., D. Wetzel, and T. O’Hara. 2006.Human health implications of omega-3 and omega-6 fatty acids in bowhead whale (Balaena mysticetus) blubber. Arctic Vol. 59, No. 2: 155-164
 
50. Bradley, M.J., S.J. Kutz, E. Jenkin, T.M. O’Hara. 2005. The Potential Impact of Climate Change on Infectious Diseases of Arctic Fauna. Int J Circumpolar Health 2005; 64(5): 468-478 [ PMID: 16440609]
 
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 tracemetal 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 [ PMID: 16216281]
 
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 [ PMID: 16896468]
 
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 [ PMID: 17126888]
 
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. 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. 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
 
 
66. Bentzen, T.W., 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. Volume 406, Issues 1-2, 15 November 2008, Pages 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. Vol. 28 No. 7: 1416-1424 [ PMID: 19226182]
 
71. Li Chen, Tânia, S.S. Wise, S. Kraus, F. Shaffiey, K.M. Levine, W. D. Thompson, T. Romano, T. O’Haraand J. Pierce 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 Jun;50(5):387-93.
 
72. Moses, S.K., A.V. Whiting, D.C.G. Muir, X. Wang, T.M. O’Hara. 2009. Organic nutrients and contaminants in subsistence species of Alaska: Concentrations and relationship to food preparation method. International Journal of Circumpolar Health 68(4):354-371 [NIHMS149830]
 
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.M., D. Holcomb, P. Elzer, J. Estepp, Q. Perry, S. Hagius, C. Kirk. 2010. Brucella Species Survey in Polar Bears (Ursus maritimus) of Northern Alaska. J. of Wildlife Diseases. 46(3): 687–694
 
75. Kirk, C.M., S. Amstrup, R. Swor, D. Holcomb and T.M. O’Hara. 2010.Morbillivirus and Toxoplasma Exposure and Associationwith Hematological Parameters for Southern BeaufortSea Polar Bears: Potential Response to Infectious Agentsin a Sentinel Species. EcoHealth. DOI: 10.1007/s10393-010-0323-0
 
76. Kirk, C.M., S. Amstrup, Rhonda Swor, Darce Holcomb, and T.M. O’Hara. 2010.Hematology of Southern Beaufort Sea Polar Bears (2005-2007): Biomarker for an Arctic Ecosystem Health Sentinel. EcoHealth. DOI: 10.1007/s10393-010-0322-1
 
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 Chemistry. DOI: 10.1002/etc.521
 
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. Miller, Woshner, Wells, Willetto, Knott and O'Hara. Epidermal histopmorphology and histopathology related to various biological variables of live captured bottlenose dolphins from Sarasota Bay, Florida. (submitted)
 
82. Van Hemert, C., C.M. Handel, R.M. Swor, T.M. O’Hara. Submitted. Microanatomy of Passerine Hard Keratins: Functional Implications of Beak and Claw Structure in the Black-capped Chickadee (Poecile atricapillus). Journal of Morphology
 
83. Knott, K.K., Boyd, D., Ylitalo, G., O’Hara, T.M. Concentrations of mercury and polychlorinated biphenyls in blood of Southern Beaufort Sea polar bears (Ursus maritimus) during spring: Variations with lipids and feeding ecology by cohort. Canadian Journal of Zoology.
 
84. Knott, K.K., Schenk, P., Beyerlein, S., Boyd, D., Ylitalo, G., O’Hara, T.M. 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. Environ. Res. [epub ahead of print] [PMID: 21903210]
 
85. Knott, K.K., Miller, D.L., Muir, D.C.G., Follmann, E., O’Hara, T.M. In preparation. Tissular concentrations of mercury and polychlorinated biphenyls in arctic fox: An histopathological assessment of alterations in target organs of toxicity (thyroid, liver, and kidney)
 
86. Rosa, Cheryl; Zeh, Judy; George, Craig; Bada, Jeffrey; Botta, Oliver; Zauscher, Melanie; O'Hara, Todd. Accepted. Age estimates based on aspartic acid racemization for bowhead whales (Balaena mysticetus) harvested in 1998-2000. Accepted Marine Mammal Science
 
87. Rosa, Cheryl; O'Hara, Todd; Gray, Matthew; Blake, John. Dermal collagen distribution and its relationship to lipid and blubber thickness in the bowhead whale. Submitted Marine Mammal Science
 
88. Lieske, Camilla, Sarah Moses, J Margaret Castellini, Karsten Hueffer, Todd O’Hara. 2011 Toxicokinetics of Total Mercury in Canine Blood  Acta Veterinaria Scandinavica, 53:66 doi:10.1186/1751-0147-53-66 Published: 7 December 2011 PMID: 22152014
 
89. Hueffer, Karsten, Darce Holcomb, Lora R. Ballweber, Scott M. Gende, Gail Blundell, Todd M. O’Hara. In Press. Serological surveillance of multiple pathogens in a declining harbor seal population in Glacier Bay National Park and a reference site. J. of Wildlife Diseases
 
90.  Knott, K.K., D. Boyd, G. Ylitalo, T.M. O’Hara. 2012. Lactational  transfer of mercury and polychlorinated biphenyls in polar bears. Chemosphere. Published on line 
http://dx.doi.org/10.1016/j.chemosphere.2012.02.053 
 
91.  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 Physiology, Part C 156: 59–66
 
92. Knott, K.K., D. Boyd, G. Ylitalo, T.M. O’Hara. 2012. Lactational transfer of mercury and polychlorinated biphenyls in polar bears. Chemosphere 88: 395–402
 
93.  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. July, 48:686-694
 
94. 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
 
95.  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. DOI: 10.1007/s10393-012-0784-4