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O'hara, Todd Professor and Head

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Overview

HR job title

• Professor and Head

Publications

selected publications

• academic article

  • O'Hara, T. M., Hanns, C., Woshner, V. M., Zeh, J., Bratton, G., & Taylor, R. (2023). Essential and non-essential elements in the bowhead whale: epidermis-based predictions of blubber, kidney, liver and muscle tissue concentrations. 10(2), 107-117.
    
  • Houde, M., Krmmel, E. M., Mustonen, T., Brammer, J., Brown, T. M., Chtelat, J., ... Whiting, A. (2022). Contributions and perspectives of Indigenous Peoples to the study of mercury in the Arctic. Science of the Total Environment.  841, 156566-156566.
    
  • Rea, L. D., Castellini, J. M., Avery, J. P., Fadely, B. S., Burkanov, V. N., Rehberg, M. J., & O'Hara, T. M. (2022). Corrigendum to "Regional variations and drivers of mercury and selenium concentrations in Steller sea lions" [Sci. Total Environ. 744 (2020) 140787]. Science of the Total Environment.  831, 154887-154887.
    
  • Murillo-Cisneros, D. A., McHuron, E. A., Zenteno-Savn, T., Castellini, J. M., Field, C. L., & O'Hara, T. M. (2022). Fetal mercury concentrations in central California Pacific harbor seals: Associated drivers and outcomes. Science of the Total Environment.  820, 153246-153246.
    
  • Bar-Camarasa, I., Marmolejo-Rodrguez, A. J., O'Hara, T. M., Castellini, J. M., Murillo-Cisneros, D. A., Martnez-Rincn, R. O., Elorriaga-Verplancken, F. R., & Galvn-Magaa, F. (2022). Mercury maternal transfer in two placental sharks and a yolk-sac ray from Baja California Sur, Mexico. MARINE POLLUTION BULLETIN.  179, 113672-113672.
    
  • Castellini, J. M., Rea, L. D., Avery, J. P., & O'Hara, T. M. (2022). Total Mercury, Total Selenium, and Monomethylmercury Relationships in Multiple Age Cohorts and Tissues of Steller Sea Lions (Eumetopias jubatus). Environmental Toxicology and Chemistry.  41(6), 1477-1489.
    
  • Lian, M., Field, C. L., van Wijngaarden, E., Rios, C., Castellini, J. M., Greig, D. J., ... O'Hara, T. M. (2021). Assessment of clinical outcomes associated with mercury concentrations in harbor seal pups (Phoca vitulina richardii) in central California. Science of the Total Environment.  758, 143686-143686.
    
  • Bar-Camarasa, I., Marmolejo-Rodrguez, A. J., O'Hara, T. M., Elorriaga-Verplancken, F. R., Trejo-Ramrez, A., Martnez-Rincn, R. O., & Galvn-Magaa, F. (2021). Isotopic (15 N) relationship of pregnant females and their embryos: Comparing placental and yolk-sac viviparous elasmobranchs. Journal of Fish Biology.  98(3), 784-790.
    
  • Murillo-Cisneros, D. A., Zenteno-Savn, T., Harley, J., Cyr, A., Hernndez-Almaraz, P., Gaxiola-Robles, R., Galvn-Magaa, F., & O'Hara, T. M. (2021). Mercury concentrations in Baja California Sur fish: Dietary exposure assessment. Chemosphere.  267, 129233-129233.
    
  • Kennedy, S. N., Keogh, M., Levin, M., Castellini, J. M., Lian, M., Fadely, B. S., Rea, L. D., & O'Hara, T. M. (2021). Regional variations and relationships among cytokine profiles, white blood cell counts, and blood mercury concentrations in Steller sea lion (Eumetopias jubatus) pups. Science of the Total Environment.  775, 144894-144894.
    
  • Pancaldi, F., Pez-Osuna, F., Marmolejo-Rodrguez, A. J., Whitehead, D. A., Gonzlez-Armas, R., Soto-Jimnez, M. F., ... Galvn-Magaa, F. (2021). Variation of essential and non-essential trace elements in whale shark epidermis associated to two different feeding areas of the Gulf of California. Environmental Science and Pollution Research.  28(27), 36803-36816.
    
  • Lian, M., Castellini, J. M., Miller, D., Griff, B., Vertyankin, V. V., Dupont, J., ... O'Hara, T. M. (2020). Assessing delta C-13, delta N-15 and Total Mercury Measures in Epidermal Biopsies From Gray Whales. Frontiers in Marine Science.  7, 133.
    
  • Lian, M., Castellini, J. M., Kuhn, T., Rea, L., Bishop, L., Keogh, M., ... O'Hara, T. (2020). Assessing oxidative stress in Steller sea lions (Eumetopias jubatus): Associations with mercury and selenium concentrations. 235, 108786-108786.
    
  • Levin, M., Jasperse, L., Desforges, J., O'Hara, T., Rea, L., Castellini, J. M., ... Keogh, M. (2020). Methyl mercury (MeHg) in vitro exposure alters mitogen-induced lymphocyte proliferation and cytokine expression in Steller sea lion (Eumetopias jubatus) pups. Science of the Total Environment.  725, 138308-138308.
    
  • Rea, L. D., Castellini, J. M., Avery, J. P., Fadely, B. S., Burkanov, V. N., Rehberg, M. J., & O'Hara, T. M. (2020). Regional variations and drivers of mercury and selenium concentrations in Steller sea lions. Science of the Total Environment.  744, 140787-140787.
    
  • Kennedy, S. N., Castellini, J. M., Hayden, A. B., Fadely, B. S., Burkanov, V. N., Dajles, A., O'Hara, T. M., & Rea, L. D. (2019). REGIONAL AND AGE-RELATED VARIATIONS IN HAPTOGLOBIN CONCENTRATIONS IN STELLER SEA LIONS ( EUMETOPIAS JUBATUS) FROM ALASKA, USA. Journal of Wildlife Diseases.  55(1), 91-104.
    
  • Harley, J. R., Gill, V. A., Lee, S., Kannan, K., Santana, V., Burek-Huntington, K., & O'Hara, T. M. (2019). Concentrations of organohalogens (PCBs, DDTs, PBDEs) in hunted and stranded Northern sea otters (Enhydra lutris kenyoni) in Alaska from 1992 to 2010: Links to pathology and feeding ecology. Science of the Total Environment.  691, 789-798.
    
  • Cyr, A. P., Lpez, J. A., Wooller, M. J., Whiting, A., Gerlach, R., & O'Hara, T. (2019). Ecological drivers of mercury concentrations in fish species in subsistence harvests from Kotzebue Sound, Alaska. Environmental Research.  177, 108622-108622.
    
  • McHuron, E. A., Castellini, J. M., Rios, C. A., Berner, J., Gulland, F., Greig, D. J., & O'Hara, T. M. (2019). HAIR, WHOLE BLOOD, AND BLOOD-SOAKED CELLULOSE PAPER-BASED RISK ASSESSMENT OF MERCURY CONCENTRATIONS IN STRANDED CALIFORNIA PINNIPEDS. Journal of Wildlife Diseases.  55(4), 823-833.
    
  • Pancaldi, F., Galvn-Magaa, F., Gonzlez-Armas, R., Soto-Jimenez, M. F., Whitehead, D. A., O'Hara, T., ... Pez-Osuna, F. (2019). Mercury and selenium in the filter-feeding whale shark (Rhincodon typus) from two areas of the Gulf of California, Mexico. MARINE POLLUTION BULLETIN.  146, 955-961.
    
  • Cyr, A., Lpez, J. A., Rea, L., Wooller, M. J., Loomis, T., Mcdermott, S., & O'Hara, T. M. (2019). Mercury concentrations in marine species from the Aleutian Islands: Spatial and biological determinants. Science of the Total Environment.  664, 761-770.
    
  • Pancaldi, F., Pez-Osuna, F., Soto-Jimnez, M. F., Gonzlez-Armas, R., O'Hara, T., Marmolejo-Rodrguez, A. J., Vzquez, A., & Galvn-Magaa, F. (2019). Trace Elements in Tissues of Whale Sharks (Rhincodon typus) Stranded in the Gulf of California, Mexico. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY.  103(4), 515-520.
    
  • Murillo-Cisneros, D. A., O'Hara, T. M., Elorriaga-Verplancken, F. R., Snchez-Gonzlez, A., Marn-Enrquez, E., Marmolejo-Rodrguez, A. J., & Galvn-Magaa, F. (2019). Trophic Structure and Biomagnification of Total Mercury in Ray Species Within a Benthic Food Web. Archives of Environmental Contamination and Toxicology.  77(3), 321-329.
    
  • Murillo-Cisneros, D. A., OHara, T. M., Elorriaga-Verplancken, F. R., Curiel-Godoy, P., Snchez-Gonzlez, A., Marmolejo-Rodrguez, A. J., Marn-Enrquez, E., & Galvn-Magaa, F. (2019). Trophic assessment and isotopic niche of three sympatric ray species of western Baja California Sur, Mexico. Environmental Biology of Fishes.  102(12), 1519-1531.
    
  • Harley, J., Gaxiola-Robles, R., Zenteno-Savn, T., Mndez-Rodrguez, L. C., Bencomo-Alvarez, A. E., Thiede, A., & O'Hara, T. M. (2019). Using carbon and nitrogen stable isotope modelling to assess dietary mercury exposure for pregnant women in Baja California Sur, Mexico. Chemosphere.  234, 702-714.
    
  • Kennedy, S. N., Wilhite, B., Castellini, J. M., Rea, L. D., Kuhn, T., & OHara, T. (2018). Validation of a Protein A-based ELISA for quantifying Immunoglobulin G in a non-traditional wildlife species, the Steller sea lion ( Eumatopias jubatus ). 200(1_Supplement), 120.44-120.44.
    
  • O'Hara, T. M., Templeton, M., Castellini, J. M., Wells, R., Beckmen, K., & Berner, J. (2018). Use of Blood-soaked Cellulose Filter Paper for Measuring Carbon and Nitrogen Stable Isotopes. Journal of Wildlife Diseases.  54(2), 375-379.
    
  • McGrew, A. K., O'Hara, T. M., Stricker, C. A., Salman, M. D., Van Bonn, W., Gulland, F., Whiting, A., & Ballweber, L. R. (2018). Ecotoxicoparasitology of the gastrointestinal tracts of pinnipeds: the effect of parasites on the potential bioavailability of total mercury (THg). Science of the Total Environment.  631-632, 233-238.
    
  • Kennedy, S. N., Wilhite, B., Margaret Castellini, J., Rea, L. D., Kuhn, T. B., Ferrante, A., & O'Hara, T. M. (2018). Enhanced quantification of serum immunoglobulin G from a non-model wildlife species, the Steller sea lion (Eumetopias jubatus), using a protein A ELISA. Immunotechnology : an international journal of immunological engineering.  462, 42-47.
    
  • Murillo-Cisneros, D. A., O'Hara, T. M., Castellini, J. M., Snchez-Gonzlez, A., Elorriaga-Verplancken, F. R., Marmolejo-Rodrguez, A. J., Marn-Enrquez, E., & Galvn-Magaa, F. (2018). Mercury concentrations in three ray species from the Pacific coast of Baja California Sur, Mexico: Variations by tissue type, sex and length. MARINE POLLUTION BULLETIN.  126, 77-85.
    
  • Doll, A. C., Taras, B. D., Stricker, C. A., Rea, L. D., O'Hara, T. M., Cyr, A. P., ... Wunder, M. B. (2018). Temporal records of diet diversity dynamics in individual adult female Steller sea lion (Eumetopias jubatus) vibrissae. Oecologia.  188(1), 263-275.
    
  • Lian, M., Johnson, S., Gelatt, T., O'Hara, T. M., Beckmen, K. B., & Rea, L. D. (2018). Field anesthesia of juvenile Steller sea lions (Eumetopias jubatus) using inhalation anesthesia. Marine Mammal Science.  34(1), 125-135.
    
  • Gribble, M. O., Karimi, R., Feingold, B. J., Nyland, J. F., O'hara, T. M., Gladyshev, M. I., & Chen, C. Y. (2017). Mercury, selenium and fish oils in marine food webs and implications for human health - CORRIGENDUM. The Journal of the Marine Biological Association of the United Kingdom.  97(6), 1435-1435.
    
  • Cyr, A., Sergeant, C. J., Lopez, J. A., & O'Hara, T. (2017). Assessing the influence of migration barriers and feeding ecology on total mercury concentrations in Dolly Varden (Salvelinus malma) from a glaciated and non-glaciated stream. Science of the Total Environment.  580, 710-718.
    
  • Hayden, M., Bhawal, R., Escobedo, J., Harmon, C., O'Hara, T. M., Klein, D., ... Godard-Codding, C. (2017). Nanospray liquid chromatography/tandem mass spectrometry analysis of steroids from gray whale blubber. Rapid Communications in Mass Spectrometry.  31(13), 1088-1094.
    
  • HernndezAlmaraz, P., MndezRodrguez, L., ZentenoSavn, T., O'Hara, T. M., Harley, J. R., & ServiereZaragoza, E. (2016). Concentrations of trace elements in sea urchins and macroalgae commonly present in Sargassum beds: implications for trophic transfer. Ecological Research.  31(6), 785-798.
    
  • Harley, J. R., Bammler, T. K., Farin, F. M., Beyer, R. P., Kavanagh, T. J., Dunlap, K. L., ... O'Hara, T. M. (2016). Using Domestic and Free-Ranging Arctic Canid Models for Environmental Molecular Toxicology Research. Environmental Science and Technology (Washington).  50(4), 1990-1999.
    
  • Gribble, M. O., Karimi, R., Feingold, B. J., Nyland, J. F., O'Hara, T. M., Gladyshev, M. I., & Chen, C. Y. (2016). Mercury, selenium and fish oils in marine food webs and implications for human health. 96(1), 43-59.
    
  • Peterson, S. H., McHuron, E. A., Kennedy, S. N., Ackerman, J. T., Rea, L. D., Castellini, J. M., O'Hara, T. M., & Costa, D. P. (2016). Evaluating Hair as a Predictor of Blood Mercury: The Influence of Ontogenetic Phase and Life History in Pinnipeds. Archives of Environmental Contamination and Toxicology.  70(1), 28-45.
    
  • Bentzen, R., Castellini, J. M., Gerlach, R., Dykstra, C., & O'Hara, T. (2016). Mercury concentrations in Alaska Pacific halibut muscle relative to stable isotopes of C and N and other biological variables. MARINE POLLUTION BULLETIN.  113(1-2), 110-116.
    
  • Moses, S. K., Harley, J. R., Lieske, C. L., Muir, D., Whiting, A. V., & O'Hara, T. M. (2015). Variation in bioaccumulation of persistent organic pollutants based on octanol-air partitioning: Influence of respiratory elimination in marine species. MARINE POLLUTION BULLETIN.  100(1), 122-127.
    
  • Van Hoomissen, S., Gulland, F., Greig, D. J., Castellini, J. M., & O'Hara, T. M. (2015). Blood and Hair Mercury Concentrations in the Pacific Harbor Seal (Phoca vitulina richardii) Pup: Associations with Neurodevelopmental Outcomes. Ecohealth.  12(3), 490-500.
    
  • Furin, C. G., von Hippel, F. A., Postlethwait, J., Buck, C. L., Cresko, W. A., & O'Hara, T. M. (2015). Developmental timing of perchlorate exposure alters threespine stickleback dermal bone. General and Comparative Endocrinology.  219, 36-44.
    
  • Furin, C. G., von Hippel, F. A., Postlethwait, J. H., Buck, C. L., Cresko, W. A., & O'Hara, T. M. (2015). Developmental timing of sodium perchlorate exposure alters angiogenesis, thyroid follicle proliferation and sexual maturation in stickleback. General and Comparative Endocrinology.  219, 24-35.
    
  • McGrew, A. K., O'Hara, T. M., Stricker, C. A., Margaret Castellini, J., Beckmen, K. B., Salman, M. D., & Ballweber, L. R. (2015). Ecotoxicoparasitology: Understanding mercury concentrations in gut contents, intestinal helminths and host tissues of Alaskan gray wolves (Canis lupus). Science of the Total Environment.  536, 866-871.
    
  • Montrose, L., Noonan, C. W., Cho, Y. H., Lee, J., Harley, J., O'Hara, T., Cahill, C., & Ward, T. J. (2015). Evaluating the effect of ambient particulate pollution on DNA methylation in Alaskan sled dogs: potential applications for a sentinel model of human health. Science of the Total Environment.  512-513, 489-494.
    
  • Harley, J., Lieske, C., Bhojwani, S., Castellini, J. M., Lpez, J. A., & O'Hara, T. M. (2015). Mercury and methylmercury distribution in tissues of sculpins from the Bering Sea. Polar Biology.  38(9), 1535-1543.
    
  • Correa, L., Castellini, J. M., Quakenbush, L. T., & O'Hara, T. M. (2015). Mercury and selenium concentrations in skeletal muscle, liver, and regions of the heart and kidney in bearded seals from Alaska, USA. Environmental Toxicology and Chemistry.  34(10), 2403-2408.
    
  • 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.  83(1), 48-57.
    
  • Correa, L., Rea, L. D., Bentzen, R., & O'Hara, T. M. (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(1-2), 175-182.
    
  • McGrew, A. K., Ballweber, L. R., Moses, S. K., Stricker, C. A., Beckmen, K. B., Salman, M. D., & O'Hara, T. M. (2014). Mercury in gray wolves (Canis lupus) in Alaska: increased exposure through consumption of marine prey. Science of the Total Environment.  468-469, 609-613.
    
  • van Wijngaarden, E., Harrington, D., Kobrosly, R., Thurston, S. W., O'Hara, T., McSorley, E. M., ... Davidson, P. W. (2014). Prenatal exposure to methylmercury and LCPUFA in relation to birth weight. ANNALS OF EPIDEMIOLOGY.  24(4), 273-278.
    
  • Hansen, C. M., Hueffer, K., Gulland, F., Wells, R. S., Balmer, B. C., Castellini, J. M., & O'Hara, T. (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.
    
  • Bentzen, T. W., Shideler, R. T., & O'Hara, T. M. (2014). Use of stable isotope analysis to identify food-conditioned grizzly bears on Alaska's North Slope. Ursus.  25(1), 14-23.
    
  • Schillaci, M. A., Castellini, J. M., Stricker, C. A., Jones-Engel, L., Lee, B., & O'Hara, T. M. (2014). Variation in hair (13)C and (15)N values in long-tailed macaques (Macaca fascicularis) from Singapore. Primates: journal of primatology.  55(1), 25-34.
    
  • Gaxiola-Robles, R., Bentzen, R., Zenteno-Savn, T., Labrada-Martagn, V., Castellini, J. M., Celis, A., O'Hara, T., & Celina Mndez-Rodrguez, L. (2014). Marine diet and tobacco exposure affects mercury concentrations in pregnant women (I) from Baja California Sur, Mexico. Toxicology Reports.  1, 1123-1132.
    
  • Bentzen, R., Castellini, J. M., Gaxiola-Robles, R., Zenteno-Savn, T., Mndez-Rodrguez, L. C., & O'Hara, T. (2014). Relationship between self-reported fish and shellfish consumption, carbon and nitrogen stable isotope values and total mercury concentrations in pregnant women (II) from Baja California Sur, Mexico. Toxicology Reports.  1, 1115-1122.
    
  • Rosa, C., Zeh, J., George, J. C., Botta, O., Zauscher, M., Bada, J., & O'Hara, T. M. (2013). Age estimates based on aspartic acid racemization for bowhead whales (Balaena mysticetus) harvested in 19982000 and the relationship between racemization rate and body temperature. Marine Mammal Science.  29(3), 424-445.
    
  • Hueffer, K., Gende, S. M., & O'Hara, T. M. (2013). Assay dependence of Brucella antibody prevalence in a declining Alaskan harbor seal (Phoca vitulina) population. Acta Veterinaria Scandinavica.  55(1), 2.
    
  • Correa, L., Castellini, J. M., Wells, R. S., & O'Hara, T. (2013). Distribution of mercury and selenium in blood compartments of bottlenose dolphins (Tursiops truncatus) from Sarasota Bay, Florida. Environmental Toxicology and Chemistry.  32(11), 2441-2448.
    
  • Willacker, J. J., von Hippel, F. A., Ackerly, K. L., & O'Hara, T. M. (2013). Habitat-specific foraging and sex determine mercury concentrations in sympatric benthic and limnetic ecotypes of threespine stickleback. Environmental Toxicology and Chemistry.  32(7), 1623-1630.
    
  • Van Hemert, C., Armin, A. G., Blake, J. E., Handel, C. M., & O'Hara, T. M. (2013). Macroscopic, histologic, and ultrastructural lesions associated with avian keratin disorder in black-capped chickadees (Poecile atricapillus). Veterinary Pathology.  50(3), 500-513.
    
  • Rea, L. D., Castellini, J. M., Correa, L., Fadely, B. S., & O'Hara, T. M. (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.
    
  • Furin, C. G., von Hippel, F. A., Hagedorn, B., & O'Hara, T. M. (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.
    
  • Barrera-Garca, A., O'Hara, T., Galvn-Magaa, F., Mndez-Rodrguez, L. C., Castellini, J. M., & Zenteno-Savn, T. (2013). Trace elements and oxidative stress indicators in the liver and kidney of the blue shark (Prionace glauca). Comparative Biochemistry and Physiology Part A: Molecular and Integrative Physiology.  165(4), 483-490.
    
  • Dietz, R., Sonne, C., Basu, N., Braune, B., O'Hara, T., Letcher, R. J., ... Aars, J. (2013). What are the toxicological effects of mercury in Arctic biota?. Science of the Total Environment.  443, 775-790.
    
  • Barrera-Garca, A., O'Hara, T., Galvn-Magaa, F., Mndez-Rodrguez, L. C., Castellini, J. M., & Zenteno-Savn, T. (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 C: Toxicology and Pharmacology.  156(2), 59-66.
    
  • Van Hemert, C., Handel, C. M., Blake, J. E., Swor, R. M., & O'Hara, T. M. (2012). Microanatomy of passerine hard-cornified tissues: beak and claw structure of the black-capped chickadee (Poecile atricapillus). JOURNAL OF MORPHOLOGY.  273(2), 226-240.
    
  • Van Hemert, C., Handel, C. M., & O'Hara, T. M. (2012). Evidence of accelerated beak growth associated with avian keratin disorder in black-capped chickadees (Poecile atricapillus). Journal of Wildlife Diseases.  48(3), 686-694.
    
  • McHuron, E. A., Harvey, J. T., Castellini, J. M., & O'Hara, T. M. (2012). Hair sampling location in harbor seals (Phoca vitulina) affects selenium and mercury concentrations: implications for study design of trace element determination in pinnipeds. MARINE POLLUTION BULLETIN.  64(11), 2519-2522.
    
  • Knott, K. K., Boyd, D., Ylitalo, G. M., & O'Hara, T. M. (2012). Lactational transfer of mercury and polychlorinated biphenyls in polar bears. Chemosphere.  88(4), 395-402.
    
  • Castellini, J. M., Rea, L. D., Lieske, C. L., Beckmen, K. B., Fadely, B. S., Maniscalco, J. M., & O'Hara, T. M. (2012). Mercury concentrations in hair from neonatal and juvenile Steller Sea Lions (Eumetopias jubatus): implications based on age and region in this northern Pacific marine sentinel piscivore. Ecohealth.  9(3), 267-277.
    
  • Kenney, L. A., von Hippel, F. A., Willacker, J. J., & O'Hara, T. M. (2012). Mercury concentrations of a resident freshwater forage fish at Adak Island, Aleutian Archipelago, Alaska. Environmental Toxicology and Chemistry.  31(11), 2647-2652.
    
  • van Wijngaarden, E., Harrington, D., Kobrosly, R., Thurston, S., O'Hara, T., McSorley, E., ... Davidson, P. (2012). O-095. Epidemiology.  23(5S), &na-1.
    
  • Bernhardt, R. R., von Hippel, F. A., & O'Hara, T. M. (2011). Chronic perchlorate exposure causes morphological abnormalities in developing stickleback. Environmental Toxicology and Chemistry.  30(6), 1468-1478.
    
  • Hueffer, K., O'Hara, T. M., & Follmann, E. H. (2011). Adaptation of mammalian host-pathogen interactions in a changing arctic environment. Acta Veterinaria Scandinavica.  53(1), 17.
    
  • Hueffer, K., Lieske, C. L., McGilvary, L. M., Hare, R. F., Miller, D. L., & O'Hara, T. M. (2011). Streptococcus phocae isolated from a spotted seal (Phoca largha) with pyometra in Alaska. Journal of Zoo and Wildlife Medicine.  42(1), 108-112.
    
  • Knott, K. K., Schenk, P., Beyerlein, S., Boyd, D., Ylitalo, G. M., & 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. Environmental Research.  111(8), 1124-1136.
    
  • Knott, K. K., Boyd, D., Ylitalo, G. M., & OHara, T. M. (2011). Concentrations of mercury and polychlorinated biphenyls in blood of Southern Beaufort Sea polar bears (Ursus maritimus) during spring: variations with lipids and stable isotope (15N, 13C) values. Canadian Journal of Zoology.  89(11), 999-1012.
    
  • Schillaci, M. A., Lee, B., Castellini, J. M., Reid, M., & O'Hara, T. M. (2011). Lead levels in long-tailed macaque (Macaca fascicularis) hair from Singapore. Primates: journal of primatology.  52(2), 163-170.
    
  • Lieske, C. L., Moses, S. K., Castellini, J. M., Klejka, J., Hueffer, K., & O'Hara, T. M. (2011). Toxicokinetics of mercury in blood compartments and hair of fish-fed sled dogs. Acta Veterinaria Scandinavica.  53(1), 66.
    
  • Engel, G., O'Hara, T. M., Cardona-Marek, T., Heidrich, J., Chalise, M. K., Kyes, R., & Jones-Engel, L. (2010). Synanthropic primates in Asia: potential sentinels for environmental toxins. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY.  142(3), 453-460.
    
  • O'Hara, T. M., Holcomb, D., Elzer, P., Estepp, J., Perry, Q., Hagius, S., & Kirk, C. (2010). Brucella species survey in polar bears (ursus maritimus) of northern Alaska. Journal of Wildlife Diseases.  46(3), 687-694.
    
  • Kirk, C. M., Amstrup, S., Swor, R., Holcomb, D., & O'Hara, T. M. (2010). Hematology of southern Beaufort Sea polar bears (2005-2007): biomarker for an Arctic ecosystem health sentinel. Ecohealth.  7(3), 307-320.
    
  • Kirk, C. M., Amstrup, S., Swor, R., Holcomb, D., & O'Hara, T. M. (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), 321-331.
    
  • Brookens, T. J., O'Hara, T. M., Taylor, R. J., Bratton, G. R., & Harvey, J. T. (2009). Total mercury body burden in Pacific harbor seal, Phoca vitulina richardii, pups from central California (vol 56, pg 27, 2008). MARINE POLLUTION BULLETIN.  58(12), 1953-1953.
    
  • Cardona-Marek, T., Knott, K. K., Meyer, B. E., & O'Hara, T. M. (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.
    
  • Li Chen, T., Wise, S. S., Kraus, S., Shaffiey, F., Levine, K. M., Thompson, W. D., ... Wise, J. P. (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), 387-393.
    
  • Moses, S. K., Whiting, A. V., Bratton, G. R., Taylor, R. J., & O'Hara, T. M. (2009). Inorganic nutrients and contaminants in subsistence species of Alaska: linking wildlife and human health. International Journal of Circumpolar Health.  68(1), 53-74.
    
  • Reynolds, III, J. E., Wetzel, D. L., & O'Hara, T. M. (2009). Human Health Implications of Omega-3 and Omega-6 Fatty Acids in Blubber of the Bowhead Whale (Balaena mysticetus). Arctic.  59(2),
    
  • Moses, S. K., Whiting, A. V., Muir, D., Wang, X., & O'Hara, T. M. (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.
    
  • Burek, K. A., Gulland, F., & O'Hara, T. M. (2008). Effects of climate change on Arctic marine mammal health. ECOLOGICAL APPLICATIONS.  18(2 Suppl), S126-S134.
    
  • Rosa, C., Blake, J. E., Bratton, G. R., Dehn, L., Gray, M. J., & O'Hara, T. M. (2008). Heavy metal and mineral concentrations and their relationship to histopathological findings in the bowhead whale (Balaena mysticetus). Science of the Total Environment.  399(1-3), 165-178.
    
  • Wise, J. P., Wise, S. S., Kraus, S., Shaffiey, F., Grau, M., Chen, T. L., ... O'Hara, T. (2008). Hexavalent chromium is cytotoxic and genotoxic to the North Atlantic right whale (Eubalaena glacialis) lung and testes fibroblasts. Mutation Research - Fundamental and Molecular Mechanisms of Mutagenesis.  650(1), 30-38.
    
  • Woshner, V., Knott, K., Wells, R., Willetto, C., Swor, R., & 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(3), 360-370.
    
  • Brookens, T. J., O'Hara, T. M., Taylor, R. J., Bratton, G. R., & Harvey, J. T. (2008). Total mercury body burden in Pacific harbor seal, Phoca vitulina richardii, pups from central California. MARINE POLLUTION BULLETIN.  56(1), 27-41.
    
  • Dehn, L., Sheffield, G. G., Follmann, E. H., Duffy, L. K., Thomas, D. L., & OHara, T. M. (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 Biology.  30(2), 167-181.
    
  • Rosa, C., Blake, J. E., Mazzaro, L., Hoekstra, P., Ylitalo, G. M., & O'Hara, T. M. (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 B: Biochemistry and Molecular Biology.  148(4), 454-462.
    
  • Brookens, T. J., Harvey, J. T., & O'Hara, T. M. (2007). Trace element concentrations in the Pacific harbor seal (Phoca vitulina richardii) in central and northern California. Science of the Total Environment.  372(2-3), 676-692.
    
  • Kucklick, J. R., Krahn, M. M., Becker, P. R., Porter, B. J., Schantz, M. M., York, G. S., O'Hara, T. M., & Wise, S. A. (2006). Persistent organic pollutants in Alaskan ringed seal (Phoca hispida) and walrus (Odobenus rosmarus) blubber. Environmental Science Processes and Impacts.  8(8), 848-854.
    
  • Dehn, L., Follmann, E. H., Rosa, C., Duffy, L. K., Thomas, D. L., Bratton, G. R., Taylor, R. J., & O'Hara, T. M. (2006). Stable isotope and trace element status of subsistence-hunted bowhead and beluga whales in Alaska and gray whales in Chukotka. MARINE POLLUTION BULLETIN.  52(3), 301-319.
    
  • Godard, C., Wise, S. S., Kelly, R. S., Goodale, B., Kraus, S., Romano, T., O'Hara, T., & Wise, J. P. (2006). Benzo[a]pyrene cytotoxicity in right whale (Eubalaena glacialis) skin, testis and lung cell lines. Marine Environmental Research.  62+Suppl, S20-S24.
    
  • O'Hara, T. M., Hanns, C., Bratton, G., Taylor, R., & Woshner, V. M. (2006). Essential and non-essential elements in eight tissue types from subsistence-hunted bowhead whale: nutritional and toxicological assessment. International Journal of Circumpolar Health.  65(3), 228-242.
    
  • Dehn, L., Follmann, E. H., Thomas, D. L., Sheffield, G. G., Rosa, C., Duffy, L. K., & O'Hara, T. M. (2006). Trophic relationships in an Arctic food web and implications for trace metal transfer. Science of the Total Environment.  362(1-3), 103-123.
    
  • Hughes-Hanks, J. M., Rickard, L. G., Panuska, C., Saucier, J. R., O'Hara, T. M., Dehn, L., & Rolland, R. M. (2005). Prevalence of Cryptosporidium spp. and Giardia spp. in five marine mammal species. Journal of Parasitology.  91(5), 1225-1228.
    
  • Dehn, L. A., Sheffield, G. G., Follmann, E. H., Duffy, L. K., Thomas, D. L., Bratton, G. R., Taylor, R. J., & O'Hara, T. M. (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.
    
  • Riget, F., Muir, D., Kwan, M., Savinova, T., Nyman, M., Woshner, V., & O'Hara, T. (2005). Circumpolar pattern of mercury and cadmium in ringed seals. Science of the Total Environment.  351-352, 312-322.
    
  • O'Hara, T. M., Hoekstra, P. F., Hanns, C., Backus, S. M., & Muir, D. (2005). Concentrations of selected persistent organochlorine contaminants in store-bought foods from northern Alaska. International Journal of Circumpolar Health.  64(4), 303-313.
    
  • Bradley, M., Kutz, S. J., Jenkins, E., & O'Hara, T. M. (2005). The potential impact of climate change on infectious diseases of Arctic fauna. International Journal of Circumpolar Health.  64(5), 468-477.
    
  • Holt, D. W., Hanns, C., O'Hara, T., Burek, K., & Frantz, R. (2005). New distribution records of Echinococcus multilocularis in the brown lemming from Barrow, Alaska, USA. Journal of Wildlife Diseases.  41(1), 257-259.
    
  • Elsner, R., George, J. C., & O'hara, T. (2004). VASOMOTOR RESPONSES OF ISOLATED PERIPHERAL BLOOD VESSELS FROM BOWHEAD WHALES: THERMOREGULATORY IMPLICATIONS. Marine Mammal Science.  20(3), 546-553.
    
  • Kenny, D. E., O'Hara, T. M., Chen, T. C., Lu, Z., Tian, X., & Holick, M. F. (2004). Vitamin D content in Alaskan Arctic zooplankton, fishes, and marine mammals. Zoo Biology.  23(1), 33-43.
    
  • Beckmen, K. B., Ylitalo, G. M., O'Hara, T. M., & Stott, J. L. (2004). Reply to P. Ross. MARINE POLLUTION BULLETIN.  48(7-8), 808-809.
    
  • Hoekstra, P. F., Letcher, R. J., O'Hara, T. M., Backus, S. M., Solomon, K. R., & Muir, D. (2003). Hydroxylated and methylsulfone-containing metabolites of polychlorinated biphenyls in the plasma and blubber of bowhead whales (Balaena mysticetus). Environmental Toxicology and Chemistry.  22(11), 2650-2658.
    
  • Beckmen, K. B., Blake, J. E., Ylitalo, G. M., Stott, J. L., & O'Hara, T. M. (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). 46(5), 594-606.
    
  • O'Hara, T. M., George, J. C., Blake, J., Burek, K., Carroll, G., Dau, J., ... Woshner, V. (2003). Investigation of Heavy Metals in a Large Mortality Event in Caribou of Northern Alaska. Arctic.  56(2),
    
  • Hoekstra, P. F., Braune, B. M., O'Hara, T. M., Elkin, B., Solomon, K. R., & Muir, D. (2003). Organochlorine contaminant and stable isotope profiles in Arctic fox (Alopex lagopus) from the Alaskan and Canadian Arctic. Environmental Pollution.  122(3), 423-433.
    
  • Hoekstra, P. F., O'Hara, T. M., Fisk, A. T., Borg, K., Solomon, K. R., & Muir, D. (2003). Trophic transfer of persistent organochlorine contaminants (OCs) within an Arctic marine food web from the southern Beaufort-Chukchi Seas. Environmental Pollution.  124(3), 509-522.
    
  • Hoekstra, P. F., Wong, C. S., O'Hara, T. M., Solomon, K. R., Mabury, S. A., & Muir, D. (2002). Enantiomer-specific accumulation of PCB atropisomers in the bowhead whale (Balaena mysticetus). Environmental Science and Technology (Washington).  36(7), 1419-1425.
    
  • Siefker, C., Rickard, L. G., Pharr, G. T., Simmons, J. S., & O'Hara, T. M. (2002). Molecular characterization of Cryptosporidium sp. isolated from northern Alaskan caribou (Rangifer tarandus). Journal of Parasitology.  88(1), 213-216.
    
  • Hoekstra, P. F., O'Hara, T. M., Pallant, S. J., Solomon, K. R., & Muir, D. (2002). Bioaccumulation of organochlorine contaminants in bowhead whales (Balaena mysticetus) from Barrow, Alaska. Archives of Environmental Contamination and Toxicology.  42(4), 497-507.
    
  • Woshner, V. M., Ohara, T. M., Eurell, J. A., Wallig, M. A., Bratton, G. R., Suydam, R. S., & Beasley, V. R. (2002). Distribution of inorganic mercury in liver and kidney of beluga and bowhead whales through autometallographic development of light microscopic tissue sections. Toxicologic Pathology.  30(2), 209-215.
    
  • Tittlemier, S., Borrell, A., Duffe, J., Duignan, P. J., Fair, P., Hall, A., ... Norstrom, R. (2002). Global distribution of halogenated dimethyl bipyrroles in marine mammal blubber. Archives of Environmental Contamination and Toxicology.  43(2), 244-255.
    
  • Siefker, C., Rickard, L. G., Pharr, G. T., Simmons, J. S., & O'Hara, T. M. (2002). Molecular Characterization of Cryptosporidium sp. Isolated from Northern Alaskan Caribou (Rangifer tarandus). Journal of Parasitology.  88(1), 213-213.
    
  • Kucklick, J. R., Struntz, W., Becker, P. R., York, G. W., O'Hara, T. M., & Bohonowych, J. E. (2002). Persistent organochlorine pollutants in ringed seals and polar bears collected from northern Alaska. Science of the Total Environment.  287(1-2), 45-59.
    
  • Hoekstra, P. F., O'Hara, T. M., Teixeira, C., Backus, S., Fisk, A. T., & Muir, D. (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.
    
  • Hoekstra, P. F., Dehn, L. A., George, J. C., Solomon, K. R., Muir, D. C., & O'Hara, T. M. (2002). Trophic ecology of bowhead whales (Balaena mysticetus) compared with that of other arctic marine biota as interpreted from carbon-, nitrogen-, and sulfur-isotope signatures. Canadian Journal of Zoology.  80(2), 223-231.
    
  • Woshner, V. M., O'Hara, T. M., Bratton, G. R., Suydam, R. S., & Beasley, V. R. (2001). Concentrations and interactions of selected essential and non-essential elements in bowhead and beluga whales of arctic Alaska. Journal of Wildlife Diseases.  37(4), 693-710.
    
  • Woshner, V. M., O'Hara, T. M., Bratton, G. R., & Beasley, V. R. (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(4), 711-721.
    
  • O'Hara, T. M., Carroll, G., Barboza, P., Mueller, K., Blake, J., Woshner, V., & Willetto, C. (2001). Mineral 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.
    
  • Cooper, L. W., Larsen, I. L., O'Hara, T. M., Dolvin, S., Woshner, V., & Cota, G. F. (2000). Radionuclide Contaminant Burdens in Arctic Marine Mammals Harvested During Subsistence Hunting. Arctic.  53(2),
    
  • O'Hara, T. M., Krahn, M. M., Boyd, D., Becker, P. R., & Philo, L. M. (1999). Organochlorine contaminant levels in Eskimo harvested bowhead whales of arctic Alaska. Journal of Wildlife Diseases.  35(4), 741-752.
    
  • Edmonds, M. D., Ward, F. M., O'Hara, T. M., & Elzer, P. H. (1999). Use of western immunoblot analysis for testing moose serum for Brucella suis biovar 4 specific antibodies. Journal of Wildlife Diseases.  35(3), 591-595.
    
  • O'Hara, T. M., Albert, T. F., Oen, E. O., Philo, L. M., George, J. C., & Ingling, A. L. (1999). The role of Eskimo hunters, veterinarians, and other biologists in improving the humane aspects of the subsistence harvest of bowhead whales. Journal of the American Veterinary Medical Association.  214(8), 1193-1198.
    
  • George, J. C., Bada, J., Zeh, J., Scott, L., Brown, S. E., O'Hara, T., & Suydam, R. (1999). Age and growth estimates of bowhead whales (Balaena mysticetus) via aspartic acid racemization. Canadian Journal of Zoology.  77(4), 571-580.
    
  • Beckmen, K. B., Ylitalo, G. M., Towell, R. G., Krahn, M. M., O'Hara, T. M., & Blake, J. E. (1999). Factors affecting organochlorine contaminant concentrations in milk and blood of northern fur seal (Callorhinus ursinus) dams and pups from St. George Island, Alaska. Science of the Total Environment.  231(2-3), 183-200.
    
  • O'Hara, T. M., Dasher, D., George, J. C., & Woshner, V. (1999). Radionuclude Levels in Caribou of Northern Alaska in 1995-96. Arctic.  52(3),
    
  • George, J. C., Bada, J., Zeh, J., Scott, L., Brown, S. E., O'Hara, T., & Suydam, R. (1999). Age and growth estimates of bowhead whales (Balaena mysticetus) via aspartic acid racemization. Canadian Journal of Zoology.  77(4), 571-580.
    
  • Krone, C. A., Robisch, P. A., Tilbury, K. L., Stein, J. E., Mackey, E. A., Becker, P. R., O'hara, T. M., & Philo, L. M. (1999). ELEMENTS IN LIVER TISSUES OF BOWHEAD WHALES (BALAENA MYSTICETUS). Marine Mammal Science.  15(1), 123-142.
    
  • O'Hara, T. M., House, C., House, J. A., Suydam, R. S., & George, J. C. (1998). Viral serologic survey of bowhead whales in Alaska. Journal of Wildlife Diseases.  34(1), 39-46.
    
  • O'Hara, T. M., Bennett, L., McCoy, C. P., Jack, S. W., & Fleming, S. (1995). Lead poisoning and toxicokinetics in a heifer and fetus treated with CaNa2 EDTA and thiamine. Journal of Veterinary Diagnostic Investigation.  7(4), 531-537.
    
  • Fairbrother, A., Fix, M., O'Hara, T., & Ribic, C. A. (1994). Impairment of growth and immune function of avocet chicks from sites with elevated selenium, arsenic, and boron. Journal of Wildlife Diseases.  30(2), 222-233.
    
  • Hoekstra, P. F., O'Hara, T. M., Backus, S. M., Hanns, C., & Muir, D. Concentrations of persistent organochlorine contaminants in bowhead whale tissues and other biota from northern Alaska: implications for human exposure from a subsistence diet. Environmental Research.  98(3), 329-340.
    
  • Bentzen, T. W., Muir, D., Amstrup, S. C., & O'Hara, T. M. Organohalogen concentrations in blood and adipose tissue of Southern Beaufort Sea polar bears. Science of the Total Environment.  406(1-2), 352-367.
    

• chapter

  • McHuron, E. A., Peterson, S. H., & OHara, T. M. (2018). Chapter 2 Feeding Ecology Tools to Assess Contaminant Exposure in Coastal Mammals. Marine Mammal Ecotoxicology. (pp. 39-74). Elsevier.
    
  • OHara, T., Kunito, T., Woshner, V., & Tanabe, S. (2011). Organic Contaminants in Marine Mammals. Environmental Contaminants in Biota. (pp. 349-375). Taylor & Francis.
    
  • OHara, T., Kunito, T., Woshner, V., & Tanabe, S. (2011). Select Elements and Potential Adverse Effects in Cetaceans and Pinnipeds. Environmental Contaminants in Biota. (pp. 377-406). Taylor & Francis.
    
  • Smith, P., Afzal, M., Al-Hasan, R., Bouwman, H., Castillo, L., Depledge, M., ... Godard-Codding, C. (2010). Global Perspectives on Wildlife Toxicology Emerging Issues. Wildlife Toxicology. (pp. 197-255). Taylor & Francis.
    

• conference paper

  • Beltran-Valdivia, V., O'Hara, T., Gaxiola-Robles, R., & Zenteno-Savin, T. (2020). Validation of Nobuto Filter Paper for the Quantification of Health Indicators in Livestock. Free Radical Biology and Medicine. S77-S78.
    

• institutional repository document

  • Rea, L. D., Ylitalo, G. M., Crawford, S. G., Taras, B. D., Fadely, B. S., Rehberg, M. J., & O'Hara, T. M. (2022). One Health, Spatial, and Cumulative Organochlorines and Mercury Exposure Assessment in Steller Sea Lions of Alaska: Emphasizing Pups
    

Teaching

teaching activities

• VIBS689 Sptp: One Health Tox Instructor

Background

education and training

• D.V.M., University of Wisconsin - Madison - (Madison, Wisconsin, United States) 1992
• Ph.D. in Pharmacology/Toxicology, Virginia Commonwealth University - (Richmond, Virginia, United States) 1988
• M.S. in Biology, Villanova University - (Radnor, Pennsylvania, United States) 1985

Contact

first name

• Todd

has last name

• O'hara

Other

email

• tmohara@tamu.edu