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The California State University

Publications

  • Peck, H., D. Costa, D. Crocker and J. Goldbogen. 2016. Body reserves influence allocation to immune responses in capital breeding female northern elephant seals. Functional Ecology 30: 389-397.

  • Fowler, M., C. Debier, C. Champagne, D. Crocker and D. Costa. 2016. demands of lactation promote differential regulation of lipid stores in fasting elephant seals. General and Comparative Endocrinology 225: 125-132.

  • Louis, C., A. Covaci, D. Crocker and C. Debier. 2016. Lipophilicity of PCBs and fatty acids determines their mobilisation from blubber of weaned northern elephant seal pups. Science of the Total Environment 541: 599-602.

  • Louis, C., M. Tift, D. Crocker, D. Alexander, D. Smith and C. Debier. 2015. Isolation of progenitor cells from the blubber of northern elephant seals (Mirounga angustirostris) in order to obtain an in vitro adipocyte model—preliminary results. Marine Mammal Science 31: 764-773.

  • Peterson, S., M. Peterson, C. Debier, A. Covaci, A. Dirtu, G. Malarvannan, D. Crocker, L. Schwarz and D. Costa. 2015. Deep-ocean foraging northern elephant seals bioaccumulate persistent organic pollutants. The Science of the Total Environment 533: 144-155.

  • Louis, C., L. Perdaens, S. Suciu, S. Tavoni, D. Crocker and C. Debier. 2015. Mobilisation of blubber fatty acids of northern elephant seal pups (Mirounga angustirostris) during the post-weaning fast. Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology 183: 78-86.

  • Barjau Pérez-Milicua, M., T. Zenteno-Savín, D. Crocker and J. Gallo-Reynoso. 2015. Hypoxanthine-guanine phosphoribosyltransferase and inosine 5'-monophosphate dehydrogenase activities in three mammalian species. Frontiers in Physiology 6: 212-218.

  • Khudyakov, J., C. Champagne, L. Preeyanon, R. Ortiz and D. Crocker. 2015. Muscle transcriptome response to ACTH administration in a free-ranging marine mammal. Physiological Genomics 47: 318-330.

  • Somo, D., D. Ensminger, J. Sharick, S. Kanatous and D. Crocker. 2015. Development of Dive Capacity in Northern Elephant Seals (Mirounga angustirostris). Physiological and Biochemical Zoology 88: 471-482.

  • Moore, C., A. Fahlman, D. Crocker, K. Robbins and S. Trumble. 2015. degradation of proteins in pinniped skeletal muscle. Conservation Physiology.

  • Fowler, M., C. Debier, C. Champagne, D. Crocker and D. Costa. 2015. demands of lactation promote differential regulation of lipid stores in fasting elephant seals. General and Comparative Endocrinology.

  • Atkinson, S., D. Crocker, D. Houser and K. Mashburn. 2015. Stress physiology in marine mammals. Journal of Comparative Physiology B 185: 463-486.

  • Champagne, C., M. Tift, D. Houser and D. Crocker. 2015. Adrenal sensitivity to stress is maintained despite variation in baseline glucocorticoids in moulting seals. Conservation Physiology.

  • Sharick, J., J. Vazquez‐Medina, R. Ortiz, D. Crocker and D. Costa. 2015. Oxidative stress is a potential cost of breeding in male and female northern elephant seals. Functional Ecology 29: 367-376.

  • Suzuki, M., A. Lee, J. Vázquez-Medina, J. Viscarra, D. Crocker and R. Ortiz. 2015. Plasma FGF21 concentrations, adipose fibroblast growth factor receptor-1 and β-klotho expression decrease with fasting in northern elephant seals. General and Comparative Endocrinology.

  • Khudyakov, J., L. Preeyanon, C. Champagne, R. Ortiz and D. Crocker. 2015. Transcriptome analysis of northern elephant seal (Mirounga angustirostris) muscle tissue provides a novel molecular resource and physiological insights. BMC Genomics 16: 64-64.

  • Fowler, M., D. Costa, D. Crocker, W. Shen and F. Kraemer. 2015. Adipose Triglyceride Lipase, Not Hormone-Sensitive Lipase, Is the Primary Lipolytic Enzyme in Fasting Elephant Seals (Mirounga angustirostris). Physiological and Biochemical Zoology 88: 284-294.

  • Louis, C., A. Covaci, M. Stas, D. Crocker, G. Malarvannan, A. Dirtu and C. Debier. 2015. Bioaccumulation of hydroxylated polychlorinated biphenyls and pentachlorophenol in the serum of northern elephant seal pups (Mirounga angustirostris). Environmental Research 136: 441-448.

  • Peterson, S., J. Hassrick, A. Lafontaine, J. Thome, D. Crocker, C. Debier and D. Costa. 2014. Effects of Age, Adipose Percent, and Reproduction on PCB Concentrations and Profiles in an Extreme Fasting North Pacific Marine Mammal. .

  • Chicco, A., C. Le, A. Schlater, A. Nguyen, S. Kaye, J. Beals, R. Scalzo, C. Bell, E. Gnaiger and D. Costa. 2014. High fatty acid oxidation capacity and phosphorylation control despite elevated leak and reduced respiratory capacity in northern elephant seal muscle mitochondria. The Journal of Experimental Biology 217: 2947-2955.

  • Peterson, S., J. Hassrick, A. Lafontaine, J. Thomé, D. Crocker, C. Debier and D. Costa. 2014. Effects of age, adipose percent, and reproduction on PCB concentrations and profiles in an extreme fasting North Pacific marine mammal. PloS One 9: e96191-e96112.

  • Maresh, J., S. Simmons, D. Crocker, B. McDonald, T. Williams and D. Costa. 2014. Free-swimming northern elephant seals have low field metabolic rates that are sensitive to an increased cost of transport. The Journal of Experimental Biology 217: 1485-1495.

  • Louis, C., A. Dirtu, M. Stas, Y. Guiot, G. Malarvannan, K. Das, D. Costa, D. Crocker, A. Covaci and C. Debier. 2014. Mobilisation of lipophilic pollutants from blubber in northern elephant seal pups (Mirounga angustirostris) during the post-weaning fast. Environmental Research 132: 438-448.

  • Spraker, T., E. Lyons, T. Kuzmina, M. Tift, S. Raverty, N. Jaggi and D. Crocker. 2014. Causes of death in preweaned northern elephant seal pups (Mirounga angustirostris, Gill, 1866), Año Nuevo State Reserve, California, 2012. Journal of Veterinary Diagnostic Investigation : Official Publication of the American Association of Veterinary Laboratory Diagnosticians, Inc 26: 320-326.

  • Crocker, D., C. Champagne, M. Fowler and D. Houser. 2014. Adiposity and fat metabolism in lactating and fasting northern elephant seals. Advances in Nutrition (Bethesda, Md.) 5: 57-64.

  • Moore, C., D. Crocker, A. Fahlman, M. Moore, D. Willoughby, K. Robbins, S. Kanatous and S. Trumble. 2014. Ontogenetic changes in skeletal muscle fiber type, fiber diameter and myoglobin concentration in the Northern elephant seal (Mirounga angustirostris). Frontiers in Physiology 5: 217.

  • Tift, M., P. Ponganis and D. Crocker. 2014. Elevated carboxyhemoglobin in a marine mammal, the northern elephant seal. The Journal of Experimental Biology 217: 1752-1757.

  • Ensminger, D., D. Somo, D. Houser and D. Crocker. 2014. Metabolic responses to adrenocorticotropic hormone (ACTH) vary with life-history stage in adult male northern elephant seals. General and Comparative Endocrinology 204: 150-157.

  • Fowler, M., C. Debier, E. Mignolet, C. Linard, D. Crocker and D. Costa. 2014. Fatty acid mobilization and comparison to milk fatty acid content in northern elephant seals. Journal of Comparative Physiology B: Biochemical, Systemic & Environmental Physiology 184: 125-135.

  • Lopez-Cruz, R., M. Barjau Perez-Milicua, D. Crocker, R. Gaxiola-Robles, J. Bernal-Vertiz, A. de la Rosa, J. Vazquez-Medina and T. Zenteno-Savin. 2014. Purine nucleoside phosphorylase and xanthine oxidase activities in erythrocytes and plasma from marine, semiaquatic and terrestrial mammals. Comparative Biochemistry & Physiology Part A: Molecular & Integrative Physiology 171: 31-35.

  • Crocker, D., M. Fowler, C. Champagne, A. Vanderlugt and D. Houser. 2014. Metabolic response to a glucagon challenge varies with adiposity and life-history stage in fasting northern elephant seals. General & Comparative Endocrinology 195: 99-106.

  • Houser, D., C. Champagne and D. Crocker. 2013. Non-Traditional Model of the Metabolic Syndrome. .

  • Martinez, B., J. Sonanez-Organis, J. Vazquez-Medina, J. Viscarra, D. MacKenzie, D. Crocker and R. Ortiz. 2013. Prolonged food deprivation increases mRNA expression of deiodinase 1 and 2, and thyroid hormone receptor beta-1 in a fasting-adapted mammal. Journal of Experimental Biology: 4647-4654.

  • Tavoni, S., C. Champagne, D. Houser and D. Crocker. 2013. Lactate flux and gluconeogenesis in fasting, weaned northern elephant seals ( Mirounga angustirostris). Journal of Comparative Physiology B: Biochemical, Systemic & Environmental Physiology 183: 537-546.

  • Hassrick, J., D. Crocker, D. Costa and S. Patek. 2013. Effects of maternal age and mass on foraging behaviour and foraging success in the northern elephant seal. Functional Ecology 27: 1055-1063.

  • Tift, M., E. Ranalli, D. Houser, R. Ortiz and D. Crocker. 2013. Development enhances hypometabolism in northern elephant seal pups ( Mirounga angustirostris). Functional Ecology 27: 1155-1165.

  • Currylow, A., M. Tift, J. Meyer, D. Crocker and R. Williams. 2013. Seasonal variations in plasma vitellogenin and sex steroids in male and female Eastern Box Turtles, Terrapene carolina carolina. General & Comparative Endocrinology 180: 48-55.

  • Champagne, C., S. Boaz, M. Fowler, D. Houser, D. Costa and D. Crocker. 2013. profile of carbohydrate metabolites in the fasting northern elephant seal. Comparative Biochemistry and Physiology Part D Genomics & Proteomics: 141-151.

  • Vazquez-Medina, J., J. Sonanez-Organis, R. Rodriguez, J. Viscarra, A. Nishiyama, D. Crocker and R. Ortiz. 2013. Prolonged fasting activates Nrf2 in post-weaned elephant seals. Journal of Experimental Biology: 2870-2878.

  • Suzuki, M., J. Vazquez-Medina, J. Viscarra, J. Sonanez-Organis, D. Crocker and R. Ortiz. 2013. Activation of systemic, but not local, renin-angiotensin system is associated with upregulation of TNF-alpha during prolonged fasting in northern elephant seal pups. Journal of Experimental Biology: 3215-3221.

  • Sonanez-Organis, J., J. Vazquez-Medina, D. Crocker and R. Ortiz. 2013. Prolonged fasting activates hypoxia inducible factors-1 alpha,-2 alpha and-3 alpha in a tissue-specific manner in northern elephant seal pups. Gene (Amsterdam): 155-163.

  • Champagne, C., D. Crocker and M. Fowler. 2012. Fasting Physiology of the Pinnipeds. Comparative Physiology of Fasting, Starvation, and Food Limitation: 309-336.

  • Champagne, C., D. Houser, M. Fowler, D. Costa and D. Crocker. 2012. Gluconeogenesis is associated with high rates of tricarboxylic acid and pyruvate cycling in fasting northern elephant seals. American Journal of Physiology - Regulatory, Integrative and Comparative Physiology 303: 340-352.

  • Houser, D., D. Crocker, M. Tift and C. Champagne. 2012. Glucose oxidation and nonoxidative glucose disposal during prolonged fasts of the northern elephant seal pup (Mirounga angustirostris). American Journal of Physiology - Regulatory Integrative and Comparative Physiology.

  • Habran, S., D. Crocker, C. Debier and K. Das. 2012. How are trace elements mobilized during the postweaning fast in Northern elephant seals? Environmental Toxicology & Chemistry 31: 2354-2365.

  • Hueckstaedt, L., J. Burns, P. Koch, B. McDonald, D. Crocker and D. Costa. 2012. Diet of a specialist in a changing environment. Marine Ecology Progress Series: 287-301.

  • Huckstadt, L., P. Koch, B. McDonald, M. Goebel, D. Crocker and D. Costa. 2012. Stable isotope analyses reveal individual variability in the trophic ecology of a top marine predator, the southern elephant seal. Oecologia 169: 395-406.

  • McDonald, B., M. Goebel, D. Crocker and D. Costa. 2012. Biological and Environmental Drivers of Energy Allocation in a Dependent Mammal, the Antarctic Fur Seal Pup. Physiological & Biochemical Zoology 85: 134-147.

  • Boaz, S., C. Champagne, M. Fowler, D. Houser and D. Crocker. 2012. Water-soluble vitamin homeostasis in fasting northern elephant seals (Mirounga angustirostris) measured by metabolomics analysis and standard methods. Comparative Biochemistry & Physiology Part A: Molecular & Integrative Physiology 161: 114-121.

  • McDonald, B., M. Goebel, D. Crocker and D. Costa. 2012. Dynamic Influence of Maternal and Pup Traits on Maternal Care during Lactation in an Income Breeder, the Antarctic Fur Seal. Physiological and Biochemical Zoology: 243-254.

  • Sonanez-Organis, J., J. Vazquez-Medina, T. Zenteno-Savin, A. Aguilar, D. Crocker and R. Ortiz. 2012. Prolonged fasting increases purine recycling in post-weaned northern elephant seals. Journal of Experimental Biology: 1448-1455.

  • Robinson, P., D. Costa, D. Crocker, J. Pablo Gallo-Reynoso, C. Champagne, M. Fowler, C. Goetsch, K. Goetz, J. Hassrick and L. Hueckstaedt. 2012. Foraging Behavior and Success of a Mesopelagic Predator in the Northeast Pacific Ocean. PLoS One.

  • Champagne, C., D. Houser, D. Costa and D. Crocker. 2012. Effects of Handling and Anesthetic Agents on the Stress Response and Carbohydrate Metabolism in Northern Elephant Seals. PLoS One.

  • Maxwell, S., J. Frank, G. Breed, P. Robinson, S. Simmons, D. Crocker, J. Pablo Gallo-Reynoso and D. Costa. 2012. Benthic foraging on seamounts. Marine Mammal Science.

  • Kelso, E., C. Champagne, M. Tift, D. Houser and D. Crocker. 2012. Sex differences in fuel use and metabolism during development in fasting juvenile northern elephant seals. Journal of Experimental Biology: 2637-2645.

  • Debier, C., D. Crocker, D. Houser, M. Vanden Berghe, M. Fowler, E. Mignolet, T. de Tillesse, J. Rees, J. Thome and Y. Larondelle. 2012. Differential changes of fat-soluble vitamins and pollutants during lactation in northern elephant seal mother-pup pairs. Comparative Biochemistry & Physiology Part A: Molecular & Integrative Physiology 162: 323-330.

  • Viscarra, J., J. Vazquez-Medina, R. Rodriguez, C. Champagne, S. Adams, D. Crocker and R. Ortiz. 2012. Decreased expression of adipose CD36 and FATP1 are associated with increased plasma non-esterified fatty acids during prolonged fasting in northern elephant seal pups (Mirounga angustirostris). Journal of Experimental Biology: 2455-2464.

  • Crocker, D., R. Ortiz, D. Houser, P. Webb and D. Costa. 2012. Hormone and metabolite changes associated with extended breeding fasts in male northern elephant seals (Mirounga angustirostris). Comparative Biochemistry & Physiology Part A: Molecular & Integrative Physiology 161: 388-394.

  • Crocker, D., D. Houser and P. Webb. 2012. Impact of Body Reserves on Energy Expenditure, Water Flux, and Mating Success in Breeding Male Northern Elephant Seals. Physiological and Biochemical Zoology: 11-20.

  • Houser, D., L. Yeates and D. Crocker. 2011. Cold Stress Induces an Adrenocortical Response in Bottlenose Dolphins (Tursiops truncatus). Journal of Zoo and Wildlife Medicine 42: 565-571.

  • Houser, D., L. Yeates, D. Crocker, S. Martin and J. Finneran. 2011. Behavioral reactions of dolphins and sea lions to sonarlike sound exposures. The Journal of the Acoustical Society of America 129: 2432.

  • Viscarra, J., C. Champagne, D. Crocker and R. Ortiz. 2011. 5 ' AMP-activated protein kinase activity is increased in adipose tissue of northern elephant seal pups during prolonged fasting-induced insulin resistance. Journal of Endocrinology: 317-325.

  • Aoki, K., Y. Watanabe, D. Crocker, P. Robinson, M. Biuw, D. Costa, N. Miyazaki, M. Fedak and P. Miller. 2011. Northern elephant seals adjust gliding and stroking patterns with changes in buoyancy. Journal of Experimental Biology: 2973-2987.

  • Habran, S., C. Debier, D. Crocker, D. Houser and K. Das. 2011. Blood dynamics of mercury and selenium in northern elephant seals during the lactation period. Environmental Pollution: 2523-2529.

  • Houser, D., L. Yeates and D. Crocker. 2011. COLD STRESS INDUCES AN ADRENOCORTICAL RESPONSE IN BOTTLENOSE DOLPHINS (TURSIOPS TRUNCATUS). Journal of Zoo and Wildlife Medicine: 565-571.

  • Vazquez-Medina, J., T. Zenteno-Savin, M. Tift, H. Forman, D. Crocker and R. Ortiz. 2011. Apnea stimulates the adaptive response to oxidative stress in elephant seal pups. Journal of Experimental Biology: 4193-4200.

  • Vazquez-Medina, J., T. Zenteno-Savin, H. Forman, D. Crocker and R. Ortiz. 2011. Prolonged fasting increases glutathione biosynthesis in postweaned northern elephant seals. Journal of Experimental Biology: 1294-1299.

  • Viscarra, J., C. Champagne, D. Crocker and R. Ortiz. 2011. 5 ' AMP-activated protein kinase activity is increased in adipose tissue of northern elephant seal pups during prolonged fasting-induced insulin resistance. Journal of Endocrinology: 317-325.

  • Viscarra, J., J. Vazquez-Medina, D. Crocker and R. Ortiz. 2011. Glut4 is upregulated despite decreased insulin signaling during prolonged fasting in northern elephant seal pups. American Journal of Physiology - Regulatory Integrative and Comparative Physiology.

  • Tift, M., D. Houser and D. Crocker. 2011. High-density lipoprotein remains elevated despite reductions in total cholesterol in fasting adult male elephant seals (Mirounga angustirostris). Comparative Biochemistry and Physiology Part B Biochemistry & Molecular Biology: 214-219.

  • Hassrick, J., D. Crocker, N. Teutschel, B. McDonald, P. Robinson, S. Simmons and D. Costa. 2010. Condition and mass impact oxygen stores and dive duration in adult female northern elephant seals. Journal of Experimental Biology: 585-592.

  • Norris, A., D. Houser and D. Crocker. 2010. Environment and activity affect skin temperature in breeding adult male elephant seals (Mirounga angustirostris). Journal of Experimental Biology: 4205-4212.

  • Simmons, S., D. Crocker, J. Hassrick, C. Kuhn, P. Robinson, Y. Tremblay and D. Costa. 2010. Climate-scale hydrographic features related to foraging success in a capital breeder, the northern elephant seal Mirounga angustirostris. Endangered Species Research: 1-3.

  • Costa, D., P. Robinson, J. Arnould, A. Harrison, S. Simmons, J. Hassrick, A. Hoskins, S. Kirkman, H. Oosthuizen and S. Villegas-Amtmann. 2010. Accuracy of ARGOS Locations of Pinnipeds at-Sea Estimated Using Fastloc GPS. PLoS One.

  • Vazquez-Medina, J., D. Crocker, H. Forman and R. Ortiz. 2010. Prolonged fasting does not increase oxidative damage or inflammation in postweaned northern elephant seal pups. Journal of Experimental Biology: 2524-2530.

  • Habran, S., C. Debier, D. Crocker, D. Houser, G. Lepoint, J. Bouquegneau and K. Das. 2010. Assessment of gestation, lactation and fasting on stable isotope ratios in northern elephant seals (Mirounga angustirostris). Marine Mammal Science: 880-895.

  • Costa, D., L. Huckstadt, D. Crocker, B. McDonald, M. Goebel and M. Fedak. 2010. Approaches to Studying Climatic Change and its Role on the Habitat Selection of Antarctic Pinnipeds. Integrative and Comparative Biology: 1018-1030.

  • Hassrick, J., D. Crocker, N. Teutschel, B. McDonald, P. Robinson, S. Simmons and D. Costa. 2010. Condition and mass impact oxygen stores and dive duration in adult female northern elephant seals. Journal of Experimental Biology: 585-592.

  • Costa, D., P. Robinson, J. Arnould, A. Harrison, S. Simmons, J. Hassrick, A. Hoskins, S. Kirkman, H. Oosthuizen and S. Villegas-Amtmann. 2010. Accuracy of ARGOS locations of Pinnipeds at-sea estimated using Fastloc GPS. PLoS One.

  • Crocker, D. and D. Costa. 2009. Pinniped Physiology. Encyclopedia of Marine Mammals: 873-878.

  • McDonald, B., M. Goebel, D. Crocker, Y. Tremblay and D. Costa. 2009. Effects of maternal traits and individual behavior on the foraging strategies and provisioning rates of an income breeder, the Antarctic fur seal. Marine Ecology Progress Series: 277-288.

  • Kuhn, C., D. Crocker, Y. Tremblay and D. Costa. 2009. Time to eat: Measurements of at-sea foraging in a amrine predator. Journal of Animal Ecology 78: 513-523.

  • McDonald, B., D. Crocker, J. Burns and D. Costa. 2008. Body condition as an index of winter foraging success in crabeater seals (Lobodon carcinophaga). Deep-Sea Research Part II, Topical Studies in Oceanography 55: 515-522.

  • Houser, D., D. Crocker and J. Finneran. 2008. Click-evoked potentials in a large marine mammal, the adult male northern elephant seal (Mirounga angustirostris) (L). Journal of the Acoustical Society of America: 44-47.

  • Fowler, M., C. Champagne, D. Houser and D. Crocker. 2008. Hormonal regulation of glucose clearance in lactating northern elephant seals (Mfrounga angustirostris). Journal of Experimental Biology 211: 2943-2949.

  • McDonald, B., D. Crocker, J. Burns and D. Costa. 2008. Body condition as an index of winter foraging success in crabeater seals (Lobodon carcinophaga). Deep-Sea Research Part II, Topical Studies in Oceanography 55: 515-522.

  • Houser, D., D. Crocker and J. Finneran. 2008. Click-evoked potentials in a large marine mammal, the adult male northern elephant seal (Mirounga angustirostris). Journal of the Acoustical Society of America 124: 44-47.

  • Costa, D., D. Houser and D. Crocker. 2007. Ecology of Water Relations and Thermoregulation. Encyclopedia of Life Sciences: Supplementary Set: 448-455.

  • Biuw, M., L. Boehme, C. Guinet, M. Hindell, D. Costa, J. Charrassin, F. Roquet, F. Bailleul, M. Meredith, S. Thorpe and D. Crocker. 2007. Variations in behavior and condition of a Southern Ocean top predator in relation to in situ oceanographic conditions. Proc Natl Acad Sci U S a: 13705-13710.

  • Hassrick, J., D. Crocker, R. Zeno, S. Blackwell, D. Costa and B. Le Boeuf. 2007. Swimming speed and foraging strategies of northern elephant seals. Deep-Sea Research Part II, Topical Studies in Oceanography 54: 369-383.

  • Simmons, S., D. Crocker, R. Kudela and D. Costa. 2007. Linking foraging behaviour of the northern elephant seal with oceanography and bathymetry at mesoscales. Marine Ecology Progress Series: 265-275.

  • Houser, D., D. Crocker, C. Reichmuth, J. Mulsow and J. Finneran. 2007. Auditory evoked potentials in northern elephant seals (Mirounga angustirostris). Aquatic Mammals: 110-121.

  • Houser, D., C. Champagne and D. Crocker. 2007. Lipolysis and glycerol gluconeogenesis in simultaneously fasting and lactating northern elephant seals. American Journal of Physiology: Regulatory, Integrative & Comparative Physiology 62: 2376-2381.

  • Crocker, D., N. Kofahl, G. Fellers, N. Gates and D. Houser. 2007. High rates of energy expenditure and water flux in free-ranging Point Reyes mountain beavers Aplodontia rufa phaea. Physiological and Biochemical Zoology: 635-642.

  • Kuhn, C., B. McDonald, S. Shaffer, J. Barnes, D. Crocker, J. Burns and D. Costa. 2006. Diving physiology and winter foraging behavior of a juvenile leopard seal (Hydrurga leptonyx). Polar Biology: 303-307.

  • Tremblay, Y., S. Shaffer, S. Fowler, C. Kuhn, B. McDonald, M. Weise, C. Bost, H. Weimerskirch, D. Crocker and M. Goebel. 2006. Interpolation of animal tracking data in a fluid environment. Journal of Experimental Biology: 128-140.

  • Kuhn, C., B. McDonald, S. Shaffer, J. Barnes, D. Crocker, J. Burns and D. Costa. 2006. Diving physiology and winter foraging behavior of a juvenile leopard seal (Hydrurga leptonyx). Polar Biology: 303-307.

  • McDonald, B. and D. Crocker. 2006. Physiology and Behavior Influence Lactation Efficiency in Northern Elephant Seals (Mirounga angustirostris). Physiological & Biochemical Zoology 79: 484-496.

  • Tremblay, Y., S. Shaffer, S. Fowler, C. Kuhn, B. McDonald, M. J.Weise, C. Bost, H. Weimerskirch, D. Crocker and M. Goebel. 2006. Interpolation of animal tracking data in a fluid environment. Journal of Experimental Biology 209: 128-140.

  • Crocker, D., D. Costa, B. Le Boeuf, P. Webb and D. Houser. 2006. Impact of El Nino on the foraging behavior of female northern elephant seals. Marine Ecology Progress Series: 1-10.

  • Champagne, C., D. Houser and D. Crocker. 2006. Glucose metabolism during lactation in a fasting animal, the northern elephant seal. American Journal of Physiology: Regulatory, Integrative & Comparative Physiology 60: 1129-1137.

  • Kuhn, C., B. McDonald, S. Shaffer, J. Barnes, D. Crocker, J. Burns and D. Costa. 2006. Diving physiology and winter foraging behavior of a juvenile leopard seal ( Hydrurga leptonyx). Polar Biology 29: 303-307.

  • Ortiz, R., D. Crocker, D. Houser and P. Webb. 2006. Angiotensin II and Aldosterone Increase with Fasting in Breeding Adult Male Northern Elephant Seals (Mirounga angustirostris). Physiological & Biochemical Zoology 79: 1106-1112.

  • Thornton, S., P. Hochachka and D. Crocker. 2005. Stroke volume and cardiac output in juvenile elephant seals during forced dives. The Journal of Experimental Biology 208: 3637-3643.

  • Thornton, S., P. Hochachka, D. Crocker, D. Costa, B. LeBoeuf, D. Spielman and N. Pelc. 2005. Stroke volume and cardiac output in juvenile elephant seals during forced dives. Journal of Experimental Biology 208: 3637-3643.

  • Le Boeuf, B. and D. Crocker. 2005. Ocean climate and seal condition. BMC Biology 3: 9-10.

  • Champagne, C., D. Houser and D. Crocker. 2005. Glucose production and substrate cycle activity in a fasting adapted animal, the northern elephant seal. Journal of Experimental Biology 208: 859-868.

  • Burns, J., D. Costa, M. Fedak, M. Hindell, C. Bradshaw, N. Gales, B. McDonald, S. Trumble and D. Crocker. 2004. Winter habitat use and foraging behavior of crabeater seals along the Western Antarctic Peninsula. Deep-Sea Research Part II, Topical Studies in Oceanography 51: 2279-2303.

  • Houser, D. and D. Crocker. 2004. Age, Sex, and Reproductive State Influence Free Amino Acid Concentrations in the Fasting Elephant Seal. Physiological & Biochemical Zoology 77: 838-846.

  • Noren, D., D. Crocker, T. Williams and D. Costa. 2003. Energy reserve utilization in northern elephant seal (Mirounga angustirostris) pups during the postweaning fast. J Comp Physiol B: 443-454.

  • Costa, D., D. Crocker, J. Gedamke, P. Webb, D. Houser, S. Blackwell, D. Waples, S. Hayes and B. Le Bouef. 2003. effect of a low-frequency sound source (acoustic thermometry of the ocean climate) on the diving behavior of juvenile northern elephant seals, Mirounga angustirostris. Journal of the Acoustical Society of America 113: 1155-1165.

  • Boehlert, G., D. Costa, D. Crocker, T. O'Brien, S. Levitus and P. Green-Jessen. 2002. Marine Animals as Oceanographic Data Collectors. .

  • Crocker, D., N.J. Gales and D.P. Costa. 2001. Swimming speed and foraging strategies of New Zealand sea lions. Journal of Zoology, London 254: 267-277.

  • Houser, D., D. Crocker, P. Webb and D. Costa. 2001. Renal function in suckling and fasting pups of the northern elephant seal. Comparative Biochemistry and Physiology Part a Molecular and Integrative Physiology: 2-3.

  • Thornton, S., D. Spielman, N. Pelc, W. Block, D. Crocker, D. Costa, B. LeBoeuf and P. Hochachka. 2001. Effects of forced diving on the spleen and hepatic sinus in northern elephant seal pups. Proceedings of the National Academy of Sciences of the United States of America: 9413-9418.

  • Crocker, D., J. Williams, D. Costa and B. Le Boeuf. 2001. Maternal Traits and reproductive effeort in northern elephant seals. Ecology 82: 3541-3555.

  • Boehlert, G., D. Costa, D. Crocker, P. Green, T. O'Brien, S. Levitus and B. Le Boeuf. 2001. Autonomous Pinniped Environmental Samplers. Journal of Atmospheric & Oceanic Technology 18: 1882-1893.

  • Le Boeuf, B., D. Crocker, J. Grayson, J. Gedamke, P. Webb, S. Blackwell and D. Costa. 2000. Respiration and heart rate at the surface between dives in northern elephant seals. Journal of Experimental Biology: 3265-3274.

  • Costa, D., N. Gales and D. Crocker. 1998. Blood Volume and Diving Ability of the New Zealand Sea Lion. .

  • Campagna, C., F. Quintana, B. Le Boeuf, S. Blackwell and D. Crocker. 1998. Diving behaviour and foraging ecology of female southern elephant seals from Patagonia. Aquatic Mammals: 1-11.

  • Costa, D., N. Gales and D. Crocker. 1998. Blood volume and diving ability of the New Zealand seal lion, Phocarctos hookeri. Physiological Zoology: 208-213.

  • Crocker, D., P. Webb, D. Costa and B. Le Boeuf. 1998. Protein catabolism and renal function in lactating northern elephant seals. Physiological Zoology: 485-491.

  • Crocker, D., B. Boeuf and D. Costa. 1997. Drift diving in female northern elephant seals. Canadian Journal of Zoology 75: 27-39.

  • Le Boeuf, B. and D. Crocker. 1996. Diving Behavior of Elephant Seals. Great White Sharks: 193-205.

  • Costa, D. and D. Crocker. 1996. Marine Mammals of the Southern Ocean. .

  • Le Boeuf, B., P. Morris, S. Blackwell, D. Crocker and D. Costa. 1996. Diving behavior of juvenile northern elephant seals. Canadian Journal of Zoology: 1632-1644.

  • Crocker, D. 1995. Reproductive effort and fasting physiology of female northern elephant seals, Mirounga angustirostris. .

  • Le Boeuf, B., Y. Naito, T. Asaga, D.E. Crocker and D.P. Costa. 1992. Swim speed in a female northern elephant seal. Canadian Journal of Zoology 70: 786-795.

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Educational Background

  • 1995 – Ph.D., University of California, Santa Cruz (Biology)

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