PUBLICATIONS

 

J.G. Soñanez-Organis, J.P. Vázquez-Medina, D.E. Crocker and R.M. Ortiz. Prolonged fasting activates hypoxia inducible factor -1α, -2α and -3α in a tissue-specific manner in northern elephant seal pups. Gene (in press).

M. Suzuki, J.P. Vázquez-Medina, J.A Viscarra, J.G. Soñanez- Organis, D.E. Crocker, and R.M. Ortiz. Activation of systemic, but not local, renin-angiotensin system is associated with up-regulation of TNF-α during prolonged fasting in northern elephant seal pups. Journal of Experimental Biology (in press).

Tift, M.S. E.L. Ranalli, D.S. Houser, R.M. Ortiz, and D.E. Crocker. Development enhances hypometabolism in northern elephant seal pups (Mirounga angustirostris). Functional Ecology (in press).

Vàzquez-Medina, J.P., J.G. Soñanez-Organis, R.Rodriguez, J.A. Viscarra, A. Nishiyama, D.E. Crocker, and R.M. Ortiz. Prolonged fasting activates Nrf2 in postweaned elephant seals. Journal of Experimental Biology (in press).

Hassrick, J.L., D.E. Crocker, and D.P. Costa. Effects of maternal age and mass on foraging behavior and foraging success in the northern elephant seal. Functional Ecology (in press).

Tavoni, S.K., C.D. Champagne, D.S. Houser and D.E. Crocker. 2013. Lactate flux and gluconeogenesis in fasting, weaned northern elephant seals (Mirounga angustirostris). Journal of Comparative Physiology B. 4:537-546.

 

Champagne, C.D., S.M Boaz, M.A Fowler, D.S. Houser, D.P. Costa. and D.E Crocker. 2013. A profile of carbohydrate metabolites in the fasting northern elephant seal. Journal of Comparative Physiology D. 8:141-151.

 

Currylow, A.F., M.S. Tift, J.L. Meyer, D.E. Crocker, and R.N. Williams. 2013. Seasonal variations in plasma vitellogenin and sex steroids in male and female eastern box turtles, Terrapene c. carolina. General and Comparative Endocrinology. 180: 48-55.

 

Houser, D.S., D.E. Crocker, M.S. Tift and C.D. Champagne. 2012. Glucose oxidation and non-oxidative glucose disposal during prolonged fasts of the northern elephant seal pup (Mirounga angustirostris). American Journal of Physiology: Regulatory, Integrative and Comparative Physiology. 303: 562-570.

 

Habran, S., D.E. Crocker, C. Debier and K. Das. 2012. How are trace elements mobilized during the post-weaning fast in northern elephant seals? Environmental Toxicology and Chemistry. 212: 2354-2365.

 

Crocker, D.E., D.S. Houser, and P.M. Webb. 2012. Impact of body reserves on energy expenditure, water flux, and mating success in breeding male northern elephant seals. Physiological and Biochemical Zoology. 85:11-20.

 

Champagne, C.D., D.S. Houser, M.A. Fowler, D.P. Costa, and D.E. 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.

 

E.J. Kelso, C.D. Champagne,  M.S. Tift, D.S. Houser and D.E. Crocker. 2012. Sex differences in fuel use and metabolism during development in fasting juvenile northern elephant seals. Journal of Experimental Biology. 215: 2637-2645.

 

Houser, D.S., L.C. Yeates, D.E. Crocker, S.W. Martin, J.J. Finneran. 2012. Controlled exposure study of dolphins and sea lions to midfrequency sonarlike signals. Advances in Experimental Medicine and Biology. 730:269-72.

 

Viscarra, J., J.P. Vázquez-Medina, R. Rodriguez, C.D. Champagne, S.H. Adams, D.E. Crocker, and R.M. Ortiz. 2012. Decreased expression of adipose CD36 and FATP1 are associated with increased plasma nonesterified fatty acids during prolonged fasting in northern elephant seal pups (Mirounga angustirostris). Journal of Experimental Biology. 215: 2455-2464.

 

Maxwell, S.M. J.J. Frank, G.A. Breed, P.W. Robinson, S.E. Simmons, D.E. Crocker, J.P. Gallo-Reynoso, and D.P. Costa.  2012. Benthic foraging on seamounts: a specialized foraging behavior in a deep diving marine mammal. Marine Mammal Science. 28: E333-E344.

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

Champagne, C.D., D.S. Houser, D.P. Costa, and D.E. Crocker. 2012. The effects of handling and anesthetic agents on the stress response and carbohydrate metabolism in northern elephant seals. PLoS ONE. 7(5): e36728.

Hückstädt, L.A., P.L. Koch, J.M. Burns, D.E. Crocker and D.P. Costa. 2012. Being a specialist in a changing environment: the diet of the crabeater seal along the western Antarctica Peninsula. Marine Ecology Progress Series. 455: 287-301.
 
Champagne, C.D., D.E. Crocker, M.A. Fowler and D.S. Houser. 2012. Fasting physiology of the pinnipeds: the challenges of fasting while maintaining high energy expenditure and nutrient delivery for lactation. In: The Comparative Physiology of Starvation, Fasting and Food Limitation. (ed. M.D. McCue). Springer-Verlag, Berlin. pp. 309-336.

Robinson, P.W., D.P. Costa, D.E. Crocker, J.P. Gallo-Reynoso, C.D. Champagne, M.A. Fowler, C. Goetsch, K.T. Goetz, J.L. Hassrick, L.A. Huckstadt, C.E. Kuhn, J.L. Maresh, S.M. Maxwell, B.I. McDonald, S.H. Peterson, S.E. Simmons, N.M. Teutschel, S.Villegas-Amtmann, K. Yoda. 2012. Foraging behavior and success of a mesopelagic predator in the northeast Pacific Ocean:  insights from a data-rich species, the northern elephant seal. PLoS One. 7(5): e36728. 

Hückstädt, L.A., P.L. Koch, B.I. McDonald,, M.E. Goebel, D.E. Crocker and D.P. 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.I., M.E. Goebel, D.E. Crocker, and D.P. 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. 85: 243-254.

Soñanez-Organis J.G^., J.P. Vázquez-Medina, T. Zenteno-Tavin, A. Aguilar A, D.E. Crocker, and R.M. Ortiz. 2012. Prolonged fasting increases purine recycling in postweaned northern elephant seals. Journal of Experimental Biology. 215:1448-1455.

McDonald, B.I., M.E. Goebel, D.E. Crocker, and D.P. Costa. 2012. Biological and environmental drivers of energy allocation in a dependent mammal, the Antarctic fur seal pup. Physiological and Biochemical Zoology. 85:134-147.

Crocker, D.E.,  R.M. Ortiz, D.S. Houser, P.M. Webb and D.P. Costa. 2012. Hormone and metabolite changes associated with extended breeding fasts in male northern elephant seals (Mirounga angustirostris). Journal of Comparative Biochemistry and Physiology A. 161:388-394.

 

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

 

Lyons, E.T., T. Kuzmina, T.R. Spraker, N. Jaggi, D.P. Costa, D.E. Crocker, and M.S. Tift. 2012. Parasitological examination for presence of hookworms (Uncinaria spp.) in northern elephant seals (Mirounga angustirostris) at Año Nuevo State Reserve, California. Parasitology Research. 111:1847-1850

 

Houser, D.S., L.C. Yeates, and D.E. Crocker. 2011. Cold stress induces an adrenocortical response in bottlenose dolphins (Tursiops truncatus). Journal of Zoo and Wildlife Medicine. 42(4): 565-571.

 

Vázquez-Medina, J.P., T. Zenteno-Savín, M.S. Tift, H.J. Forman, D.E. Crocker, and R.M. Ortiz. 2011. Apnea stimulates the adaptive response to oxidative stress in elephant seal pups.  Journal of Experimental Biology. 214: 4193-4200.

 

Habran, S., C. Debier, D.E. Crocker, D.S. Houser, and K. Das. 2011. Blood dynamics of mercury and selenium in northern elephant seals during the lactation period. Environmental Pollution. 159:2523-2529.

Aoki, K.Y., Y. Watanabe, D.E. Crocker, P.W. Robinson, M. Biuw, D.P. Costa, N. Miyazaki, M.A. Fedak, and P.J.O. Miller. 2011. Northern elephant seals adjust gliding and stroking patterns with changes in buoyancy: validation of at-sea metrics of body density. Journal of Experimental Biology. 214:2973-2987.

Tift, M.S., D.S. Houser, D.E. Crocker. 2011. High-density lipoprotein remains elevated despite reductions in total cholesterol in fasting adult male elephant seals (Mirounga angustirostris). Journal of Comparative Biochemistry and Physiology B. 159:214-219.

Viscarra, J., C.D. Champagne, D.E. Crocker, and R.M. 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. 209:317-325.

Vázquez-Medina, J.P., T. Zenteno-Savin, H.J. Forman, D.E. Crocker and R.M. Ortiz. 2011. Prolonged fasting increases glutathione synthesis in post-weaned elephant seals. Journal of Experimental Biology. 214:1294-1299.

Viscarra, J., J.P. Vazquez-Medina, D.E. Crocker, and R.M. 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. 300:R1501-R154.

Norris, A.L., D.S. Houser, D.E. Crocker. 2010. Environment and activity affect skin temperature in breeding adult male elephant seals (Mirounga angustirostris). Journal of Experimental Biology. 213: 4205-4212.

Costa, D.P. L. Huckstadt, D.E. Crocker, B.I. McDonald, M.E. Goebel, M.A. Fedak. 2010. Approaches to studying climatic change and its role in the habitat selection of Antarctic pinnipeds. Integrative and Comparative Biology. 50(6): 1018-1030.

Habran, S., C. Debier, D.E. Crocker, D.S. Houser, G. Lepoint, J. Bouquegneau, Jean-Marie and K. Das. 2010. Assessment of the gestation, lactation and fasting effects on stable isotope ratios in northern elephant seals (Mirounga angustirostris). Marine Mammal Science. 26(4):880-895.

Robinson, P.W., S.E. Simmons, D.E. Crocker, and D.P. Costa. 2010. Measurements of foraging success in a highly pelagic marine predator, the northern elephant seal. Journal of Animal Ecology. 79(6):1146-1156.

M.A. Hindell, D.E. Crocker, Y. Mori, and P. Tyack. 2010. Foraging behavior. In: Marine Mammal Ecology and Conservation: A Handbook of Techniques. (eds. I.L. Boyd, W.D. Bowen, and S.J. Iverson). Oxford University Press, London, pp. 243-262.

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

Simmons, S.E., D.E. Crocker, J.L. Hassrick, C.E. Kuhn, P.W. Robinson, Y. Tremblay and D. P. Costa. 2010. Climate scale hydrographic features related to foraging success in a capital breeder: the northern elephant seal (Mirounga angustirostris). Endangered Species Research. 10:233-243.

Costa, D.P, P.W. Robinson, J. P.Y. Arnould, A. Harrison, S. E. Simmons, J. L. Hassrick, A. Hoskins, S. Kirkman, H. Oosthuizen, S. Villegas-Amtmann and D.E. Crocker. 2010. Accuracy of ARGOS locations of pinnipeds at-sea estimated using Fastloc GPS. PLoS ONE. 5(1):e8677 .

Hassrick, J.L., D.E. Crocker, N.M Teutschel, B.I. McDonald, P.W. Robinson, S.E. Simmons and D.P. Costa. 2010. Condition and mass impact oxygen stores and dive duration in female northern elephant seals. Journal of Experimental Biology. 213:585-592.

McDonald B.I., M.E. Goebel, D.E. Crocker, Y. Tremblay, D.P. Costa. 2009. Impacts of maternal traits, environment, and individual behavior on foraging strategies and provisioning of an income breeder, the Antarctic fur seal. Marine Ecology Progress Series. 394: 277-276.

C.E. Kuhn, D.E. Crocker, Y. Tremblay, and D. P. Costa. 2009. Measurements of feeding behavior in a large marine predator, the northern elephant seal (Mirounga angustirostris). Journal of Animal Ecology . 78: 513-523

Crocker, D.E. and D.P. Costa. Pinniped Physiology. 2008. Revised. Pp. 873-878. In: The Encyclopedia of Marine Mammals. Academic Press. New York.

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

Houser, D. S., D.E. Crocker, and J.J. Finneran. 2008. Click-evoked potentials in a large marine mammal, the adult male northern elephant seal (Miroungaangustirostris). Journal of the Acoustical Society of America. 124(1): 44-47.

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

Zeno, R.A., D.E. Crocker, J.S. Hassrick, S.A. Allen, and D.P. Costa. 2008. Development of foraging behavior in juvenile northern elephant seals. Journal of Zoology. 274: 180-187.

Houser, D.S., C.D. Champagne, and D.E. Crocker. 2007. Lipolysis and glycerol gluconeogenesis in simultaneously fasting and lactating northern elephant seals. American Journal of Physiology: Regulatory, Integrative and Comparative Physiology. 293:R2376-R2381.

Crocker, D.E., N. Kofahl, G.D. Fellers, N.B.Gates and D.S. Houser. 2007. High rates of energy expenditure and water flux in free ranging Pt. Reyes mountain beavers. Physiological and Biochemical Zoology. 80(6): 635-642.

Simmons, S.E., D.E. Crocker, R.M. Kudela, and D.P. Costa. 2007. Linking foraging behaviour with oceanography and bathymetry at mesoscales in the northern elephant seal. Marine Ecology Progress Series. 346:265-275.

Debier, C., D.E. Crocker, D.S. Houser, V. Xhonneux, J.P. Thome. 2007. Organochlorines and lactation : mobilization and transfer to offspring in northern elephant seals. Organohalogen Compounds 69: 833-836

Biuw, M., L. Boehme, C. Guinet, M. Hindell, D. Costa, J-B. Charrassin, F. Roquet, F. Bailleul, M. Meredith, S. Thorpe, Y. Tremblay, B. McDonald, Y-H. Park, S.Rintoul, N. Bindoff, M. Goebel, D. Crocker, P. Lovell, J. Nicholson, F. Monks and M.Fedak. 2007. Variations in behaviour and condition of a Southern Ocean top predator in relation to in-situ oceanographic conditions. Proceedings of the National Academy of Sciences. 104(34): 13705-13710.

Houser, D.S., D.E. Crocker, C. Kastak, J. Mulsow, and J.J. Finneran. 2007. Auditory evoked potentials in northern elephant seals (Mirounga angustirostris). Aquatic Mammals. 33(1): 110-121.

Robinson, P.W., Y. Tremblay, M. Antolos, D.E. Crocker, C.E. Kuhn, S.A. Shaffer, S. E. Simmons, and D.P. Costa. 2007. A comparison of ARGOS-tracking-based indirect measures of foraging behavior. Deep Sea Research II. 54:356-368.

Hassrick, J.L., D. E. Crocker, R. L. Zeno, S.B. Blackwell, D.P. Costa, and B. J. LeBoeuf. 2007. Swimming speed and foraging strategies of northern elephant seals. Deep Sea Research II. 54:369-383.

Ortiz, R.M., D.E. Crocker, D.S. Houser and P.M. Webb. 2006. Angiotensin II and Aldosterone increase with fasting in breeding adult male northern elephant seals (Mirounga angustirostris). Physiological and Biochemical Zoology. 79(6):1106-1112.

Champagne, C.D., D.S. Houser, D.E. Crocker. 2006. Glucose metabolism during lactation in a fasting animal, the northern elephant seal. American Journal of Physiology: Regulatory, Integrative and Comparative Physiology. 291:R1129-R1137.

McDonald, B.I. and D.E. Crocker. 2006. Physiology and behavior impact lactation efficiency in northern elephant seals. Physiological and Biochemical Zoology. 79(3):484-496.

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

Crocker, D.E., D.P. Costa, B.J. Le Boeuf, P.M. Webb and D.S. Houser. 2006. Impact of El Nino on the foraging behavior of female northern elephant seals. Marine Ecology Progress Series. 309:1-10.

Kuhn, C.E., B.I. McDonald, S.A. Shaffer, J. Barnes, D E. Crocker, J. Burns, D.P. Costa. 2006. Diving physiology and winter foraging behavior of a juvenile leopard seal (Hydrurga leptonyx). Polar Biology. 29(4):303-307.

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

Le Boeuf, B.J. and D.E. Crocker. 2005. Ocean climate and seal condition. BMC Biology. 3:9.

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

Houser, D.S., D.E. Crocker, and D.P. Costa. 2004. Ecology of Water Relations and Thermoregulation. Nature Encyclopedia of Life Sciences. 10.1038:1-8.

Houser, D.S. and D.E. Crocker. 2004. Age, sex, and reproductive state influence free amino acid concentrations in the fasting elephant seal. Physiological and Biochemical Zoology. 77(5):838-846.

Burns, J.M. D. P. Costa, M. A. Fedak, C. J. A. Bradshaw, M. A. Hindell, N. Gales, G. McDonald, S. J. Trumble, D. E. Crocker. 2004. Winter habitat use and foraging behavior of crabeater seals along the Western Antarctic Peninsula. Deep-Sea Research II 51:2279-2303.

Noren, D.P, D. E. Crocker, T. M. Williams and D. P. Costa. 2003. Energy reserve utilization in northern elephant seal (Mirounga angustirostris) pups during thepostweaning fast: size does matter. Journal of Comparative Physiology B. 173:443-454.

Costa, D.P., D.E. Crocker, J. Gedamke, P.M. Webb, D.S. Houser, S.B. Blackwell, D. Waples, S.A. Hayes, and B.J. Le Boeuf. 2002. The effect of a low frequency sound source (ATOC) on the diving behavior of northern elephant seals, Mirounga angustirostris. Journal of the Acoustical Society of America. 113(2):1155-1165.

Boehlert, G.W, P. Green-Jessen, D.P. Costa. D.E. Crocker. T. O'Brien, and S. Levitus. 2002. Marine animals as oceanographic data collectors. Earth System Monitor. 12(4): 1-4.

Crocker.D.E., J.D. Williams, D.P. Costa, and B.J. Le Boeuf. 2001. Maternal traits and reproductive effort in northern elephant seals. Ecology. 82(12):3451-3555.

Boehlert, G.W., D. P. Costa, D. E. Crocker, P. Green, T. O'Brien, S. Levitus, and B. J. Le Boeuf. 2001. Autonomous Pinniped Environmental Samplers; Using Instrumented Animals as Oceanographic Data Collectors. Journal of Atmospheric and Oceanic Technology. 18 (11): 1882-1893.

Crocker, D.E. and D.P. Costa. Pinniped Physiology. 2001. Pp. 926-931. In: The Encyclopedia of Marine Mammals. Academic Press. New York.

Thornton, S.J., D.M. Speilman, N.J. Pelc, W.F. Block, D.E. Crocker, D.P. Costa, B.J. Le Boeuf, and P.W. Hochachka. 2001. Effects of forced diving on the spleen and hepatic sinus in northern elephant seals pups. Proceedings of the National Academy of Sciences. 98(16):9413-9418.

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

Houser, D. S., D.E. Crocker, P.M. Webb, and D.P. Costa. 2001. Renal function in suckling and fasting pups of the northern elephant seal. Comparative Biochemistry and Physiology, Part A.129:405-415.

Goebel, M. E., D. P. Costa, D.E. Crocker, J.T. Sterling, and D.A. Demer. 2000. Foraging range and dive patterns in relation to location of Antarctic fur seals, Cape Shirreff, Livingston Island, Antarctica. Pages 47-50 in Antarctic Ecosystem: Models for Wider Ecological Understaning. Eds W. Davison, C. Howard-Williams & P. Brady Caxton Press, New Zealand.

Le Boeuf, B.J., D.E. Crocker, J. Grayson, J. Gedamke, S.B. Blackwell, P.M. Webb, and D.P. Costa. 2000. Surface breathing rate and heart rate in free-ranging elephant seals. Journal of Experimental Biology.203: 3265-3274.

Le Boeuf, B.J., D.E. Crocker, D.P. Costa, S.B. Blackwell, P.M. Webb, and D.S. Houser. 2000. Foraging ecology of northern elephant seals. Ecological Monographs. 70(3): 353-382.

Costa, D.P. and D.E. Crocker. 1999. Seals (Pinnipedia). In: The Encyclopedia of Reproduction, Volume 4, ed. Knobil, E. and Neill, J.D. Academic Press. New York. pp. 313-321.

Costa, D.P. and D.E. Crocker. 1999. Whales and Porpoises (Cetacea). In: The Encyclopedia of Reproduction, Volume 4, ed. Knobil, E. and Neill, J.D. Academic Press. New York. pp. 1015 - 1020.

Crocker, D.E., P.M. Webb, D.P. Costa, and B.J. Le Boeuf. 1998. Protein catabolism and renal function in lactating northern elephant seals. Physiological Zoology. 71(5):485 - 491.

Webb, P.M., D.E. Crocker , S.B. Blackwell, D.P. Costa, and B.J. Le Boeuf. 1998. The effects of buoyancy on the diving behavior of northern elephant seals. Journal of Experimental Biology. 201:2349 - 2358.

Costa, D.P., N.J. Gales, and D.E. Crocker. 1998. Blood volume and diving ability of the New Zealand Sea Lion, Phocarctos hookei. Physiological Zoology 71:208 - 213.

Costa, D.P., D.E. Crocker, D.M. Waples, P.M. Webb, J. Gedamke, D. Houser, P.D. Goley, B.J. Le Boeuf, and J. Calambokidis. 1998. The California Marine Mammal Research Program of the Acoustic Thermometry of Ocean Climate experiment: Potential effects of low frequency sound on distribution and behavior of marine mammals. Taking a Look at California's Ocean Resources: An Agenda for the Future, ASCE, Reston, VA (USA), 1998, vol. 2, pp. 1542-1553

Campagna, C., F. Quintana, B.J. Le Boeuf, S. Blackwell, and D.E. Crocker. 1998. Diving behaviour and foraging ecology of female southern elephant seals from Patagonia. Aquatic Mammals 24(1): 1 - 11.

Costa, D.P, D.E. Crocker, B. J. Le Boeuf. 1997. The effects of low frequency sounds on pinnipeds. In: Pinniped Populations, Eastern North Pacific: Status, Trends, and Issues. (eds. G. Stone, J. Goebel, S. Webster). New England Aquarium and Monterey Bay Aquarium, pp. 95 - 106.

Crocker, D.E., B.J. Le Boeuf, and D.P. Costa. 1997. Drift diving in female northern elephant seals: implications for food processing. Canadian Journal of Zoology. 75: 27 - 39.

Costa, D.P. and D.E. Crocker. 1996. Marine mammals of the Southern Ocean. In: Foundations for Ecological Research West of the Antarctic Peninsula,Eds.R. Ross, E. Hoffmann, and L. Quentin. Antartic Research Series, Volume 70, American Geophysical Union, pp. 287 - 301.

Le Boeuf, B.J. and D.E. Crocker. 1996. Diving behavior of northern elephant seals: implications for predator avoidance. In: Great White Sharks, The Biology ofCarcharodon carcharias (eds. A. P. Klimley and D.G. Ainley), Academic Press, San Diego, pp. 193 - 206.

Le Boeuf, B.J., P.A. Morris, S.B. Blackwell, D.E. Crocker, and D.P. Costa. 1996. Diving behavior of juvenile northern elephant seals. Canadian Journal Of Zoology. 74:1632 - 1644.

Campagna, C., B.J. Le Boeuf, S.B. Blackwell, D.E. Crocker, and F. Quintana. 1995. Diving behavior and foraging location of female southern elephant seals from Patagonia. Journal of Zoology, London. 236: 55 -71.

Crocker, D.E., B.J. Le Boeuf, Y. Naito, T. Asaga, and D.P. Costa. 1994. Swim speed and dive function in a female northern elephant seal. In: Elephant Seals: Population Ecology, Behavior, and Physiology. (eds. B.J. Le Boeuf and R.M. Laws). University of California Press, Los Angeles. pp. 328 - 342.

Deutsch, C.D., D.E. Crocker, D.P. Costa, and B.J. Le Boeuf. 1994. Sex and age related variation in reproductive effort in the northern elephant seal. In: Elephant Seals: Population Ecology, Behavior, and Physiology. (eds. B.J. Le Boeuf and R.M. Laws). University of California Press, Los Angeles. pp. 169 -210.

Le Boeuf, B.J., D.E. Crocker, S.B. Blackwell, P.A. Morris, and P.H. Thorson. 1993. Sex differences in the diving and foraging behavior of northern elephant seals. In: Recent Advances in Marine Mammal Science. Symposium of the zoological Society of London. No.66: 149 - 178.

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