Research Topics
| D P CostaSummaryAffiliation: University of California Country: USA Publications
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Detail Information
Publications
The effect of a low-frequency sound source (acoustic thermometry of the ocean climate) on the diving behavior of juvenile northern elephant seals, Mirounga angustirostrisDaniel P Costa
Department of Ecology and Evolutionary Biology and the Institute of Marine Sciences, University of California, Santa Cruz California 95064, USA
J Acoust Soc Am 113:1155-65. 2003..This is the first study to quantify behavioral responses of an animal underwater with simultaneous measurements of SPL of anthropogenic sounds recorded at the animal...- Field physiology: physiological insights from animals in natureDaniel P Costa
Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California 95064, USA
Annu Rev Physiol 66:209-38. 2004..We view this theme as the cornerstone of physiological analysis and supply a number of paradigms on homeostasis that have been tested in the context of field physiology... 
Accuracy of ARGOS locations of Pinnipeds at-sea estimated using Fastloc GPSDaniel P Costa
Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, California, United States of America
PLoS ONE 5:e8677. 2010..ARGOS location estimates do not include complete error estimations, and for many marine organisms, the most commonly acquired locations (Location Class 0, A, B, or Z) are provided with no declared error estimate...- Foraging energetics and diving behavior of lactating New Zealand sea lions, Phocarctos hookeriD P Costa
Department of Biology, Institute of Marine Science, University of California, Santa Cruz, CA 95064, USA
J Exp Biol 203:3655-65. 2000.... 
Approaches to studying climatic change and its role on the habitat selection of antarctic pinnipedsDaniel P Costa
Long Marine Laboratory, University of California, 100 Shaffer Road, Santa Cruz, CA 95060, USA
Integr Comp Biol 50:1018-30. 2010..These data inform us on how these important top predators are likely to respond to climatic change, as well as about how the Southern Ocean is changing...- The effects of water temperature on the energetic costs of juvenile and adult California sea lions (Zalophus californianus): the importance of skeletal muscle thermogenesis for thermal balanceH E M Liwanag
Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95060, USA
J Exp Biol 212:3977-84. 2009..377, P=0.583) in swimming metabolic rate was found among water temperatures, suggesting that thermal disadvantages due to small body size in juvenile sea lions may be circumvented by recycling endogenous heat during locomotor activity... - Measurements of foraging success in a highly pelagic marine predator, the northern elephant sealP W Robinson
Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, 100 Shaffer Road, Santa Cruz, CA 95060, USA
J Anim Ecol 79:1146-56. 2010..4. These results support the use of transit rate as an index of foraging success: a metric that is easily derived from tracking measurements on a wide range of marine species... - The ontogeny of metabolic rate and thermoregulatory capabilities of northern fur seal, Callorhinus ursinus, pups in air and waterM J Donohue
Department of Biology, University of California, Santa Cruz, CA 95064, USA
J Exp Biol 203:1003-16. 2000..This study demonstrates that the development of thermoregulatory capabilities plays a significant role in determining when northern fur seal pups enter the water... - Effects of buoyancy on the diving behavior of northern elephant sealsP M Webb
Department of Biology, University of California, Santa Cruz, CA 95064, USA
J Exp Biol 201:2349-58. 1998..This study also validated the truncated cones method of calculating body composition in this species by comparing it with body composition determined using tritium dilution... - Stable isotope analyses reveal individual variability in the trophic ecology of a top marine predator, the southern elephant sealL A Hückstädt
Ocean Sciences Department, University of California Santa Cruz, Santa Cruz, CA 95060, USA
Oecologia 169:395-406. 2012.... - Renal function in suckling and fasting pups of the northern elephant sealD S Houser
Department of Biology, University of California, Santa Cruz, CA 95064, USA
Comp Biochem Physiol A Mol Integr Physiol 129:405-15. 2001..It is further hypothesized that aldosterone is primarily responsible for mediating renal water reabsorption in this system... - Condition and mass impact oxygen stores and dive duration in adult female northern elephant sealsJ L Hassrick
Institute of Marine Sciences, University of California at Santa Cruz, 100 Shaffer Road, Santa Cruz, CA 95060, USA
J Exp Biol 213:585-92. 2010..Our data suggest that individual physiological state variables and condition interact to determine breath-hold ability and that both should be considered in life-history studies of foraging behavior... - Respiration and heart rate at the surface between dives in northern elephant sealsB J Le Boeuf
Department of Biology and Institute of Marine Sciences, University of California, Santa Cruz, CA 95064, USA
J Exp Biol 203:3265-74. 2000..This implies that elephant seals minimize surface time spent loading oxygen depending on rates of oxygen uptake and previous depletion of stores... - Diving and swimming performance of white whales, Delphinapterus leucas: an assessment of plasma lactate and blood gas levels and respiratory ratesS A Shaffer
Marine Sciences Department, University of California, Santa Cruz, CA 95064, USA
J Exp Biol 200:3091-9. 1997..8 m s-1. The results of this study are consistent with the calculated aerobic dive limit (O2 store/metabolic rate) of 9-10 min. In addition, white whales are not well adapted for high-speed swimming compared with other small cetaceans... - Fractal landscape method: an alternative approach to measuring area-restricted searching behaviorYann Tremblay
University of California, Santa Cruz, Long Marine Laboratory, Center for Ocean Health, 100 Shaffer Road, Santa Cruz, CA 95060, USA
J Exp Biol 210:935-45. 2007..The method provides a significant new tool for studies of animals' foraging behavior and habitat selection, because it provides a method to precisely quantify each ARS separately, which is not possible with existing methods... - Total body oxygen stores and physiological diving capacity of California sea lions as a function of sex and ageMichael J Weise
Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Center for Ocean Health, 100 Shaffer Road, Santa Cruz, CA 95060, USA
J Exp Biol 210:278-89. 2007..We hypothesize that the greater mass-specific oxygen stores of female sea lions compared to males is related to differences in foraging behavior between the sexes... - Validation of water flux and body composition in glaucous gulls (Larus hyperboreus)Scott A Shaffer
Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, 95060, USA
Physiol Biochem Zool 79:836-45. 2006..The difference in TBW determined by BCA versus isotopic dilution ranged between -1.02% and +8.59% of mass. On average, TBW measured isotopically (632 +/- 24 g kg(-1)) overestimated true body water by a factor of 1.033... - Ontogeny of diving behaviour in the Australian sea lion: trials of adolescence in a late bloomerShannon L Fowler
Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95064, USA
J Anim Ecol 75:358-67. 2006..These issues may be an important factor as to why the Australian sea lion population is currently at risk... - Interpolation of animal tracking data in a fluid environmentYann Tremblay
University of California, Santa Cruz, Long Marine Laboratory, Center for Ocean Health, 100 Shaffer Road, Santa Cruz, CA 95060, USA
J Exp Biol 209:128-40. 2006..We also provide some guidelines for choosing an algorithm that is most likely to maximize track quality for different types of marine vertebrates... - Ecological implications of body composition and thermal capabilities in young antarctic fur seals (Arctocephalus gazella)Matthew R Rutishauser
Long Marine Laboratory, 100 Shaffer Road, Santa Cruz, CA 95060, USA
Physiol Biochem Zool 77:669-81. 2004..8 to 36.2 d before succumbing to starvation. The most likely maximum travel distance within this time constraint suggests that food resources close to the natal rookery are important to first-year survival for this species... - Migratory shearwaters integrate oceanic resources across the Pacific Ocean in an endless summerScott A Shaffer
Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95064, USA
Proc Natl Acad Sci U S A 103:12799-802. 2006..Sooty shearwater populations today are declining, and because they operate on a global scale, they may serve as an important indicator of climate change and ocean health... - Identifying and quantifying prey consumption using stomach temperature change in pinnipedsCarey E Kuhn
Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, Long Marine Laboratory, 100 Shaffer Road, CA 95064, USA
J Exp Biol 209:4524-32. 2006.... - Comparison of methods for evaluating energy expenditure of incubating wandering albatrossesS A Shaffer
Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, Santa Cruz, CA, 95064, USA
Physiol Biochem Zool 74:823-31. 2001.... - Aerobic dive limit: how often does it occur in nature?D P Costa
Department of Biology, Institute of Marine Science, University of California, Santa Cruz, CA 95064, USA
Comp Biochem Physiol A Mol Integr Physiol 129:771-83. 2001..The two sea lions forage on the benthos while the fur seals feed shallow in the water column. It appears that benthic foraging requires these animals to reach or exceed their aerobic dive limit... - Protein catabolism in suckling and fasting northern elephant seal pups (Mirounga anglstirostris)D S Houser
Department of Biology, University of California, Santa Cruz 95064, USA
J Comp Physiol B 171:635-42. 2001..It is proposed that strict protein conservation across suckling and fasting compensates for relative reductions in maternal investment associated with the abbreviated lactation period of the elephant seal... - Localization and visual verification of a complex minke whale vocalizationJ Gedamke
Ocean Sciences Department, University of California, Santa Cruz 95064, USA
J Acoust Soc Am 109:3038-47. 2001..At this early stage, the SW vocalization appears similar to the songs of other whale species and has characteristics consistent with those of reproductive advertisement displays... - The evolution of maximum body size of terrestrial mammalsFelisa A Smith
Department of Biology, MSC03 2020, University of New Mexico, Albuquerque, NM 87131, USA
Science 330:1216-9. 2010..Our analysis suggests that although the primary driver for the evolution of giant mammals was diversification to fill ecological niches, environmental temperature and land area may have ultimately constrained the maximum size achieved... - Milk intake and energy expenditure of free-ranging northern fur seal, Callorhinus ursinus, pupsM J Donohue
University of California, Santa Cruz, CA 95064, USA
Physiol Biochem Zool 75:3-18. 2002..Northern fur seal pups increased energy intake over lactation, while concurrent changes in body composition and pelage condition resulted in mass-specific metabolic savings after the molt... - Maneuverability by the sea lion Zalophus californianus: turning performance of an unstable body designFrank E Fish
Department of Biology, West Chester University, West Chester, PA 19383, USA
J Exp Biol 206:667-74. 2003..Enhanced turning performance is necessary for sea lions to forage after highly elusive prey in structurally complex environments... - Standard metabolic rate at the surface and during trained submersions in adult California sea lions (Zalophus californianus)J A Hurley
Department of Biology and Institute of Marine Sciences, University of California, Santa Cruz, CA 95064, USA
J Exp Biol 204:3273-81. 2001..Such metabolic flexibility enables sea lions to moderate their oxygen use during diving and to extend their aerobic diving capability... - Energy reserve utilization in northern elephant seal (Mirounga angustirostris) pups during the postweaning fast: size does matterD P Noren
Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95064, USA
J Comp Physiol B 173:443-54. 2003..This suggests that body composition at weaning influences lipid utilization patterns and ultimately the duration of the postweaning fast in northern elephant seal pups... - Water conservation in fasting northern elephant seals (Mirounga angustirostris)Christopher W Lester
Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95064, USA
J Exp Biol 209:4283-94. 2006..A combination of apneic breathing and the complex nasal turbinates allows fasting elephant seals to reduce REWL well below the rate of MWP so that they can maintain water balance during the fast... - The role of body size in individual-based foraging strategies of a top marine predatorMichael J Weise
Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Center for Ocean Health, 100 Shaffer Rd, Santa Cruz, California 95060, USA
Ecology 91:1004-15. 2010..The occurrence of foraging specializations within a species and age class has implications for quantitative modeling of population-level predator-prey interactions and ecosystem structure... - Mating system and reproductive success in eastern Pacific harbour sealsSean A Hayes
NMFS Southwest Fisheries Science Center, 110 Shaffer Road, Santa Cruz, CA 95060, USA
Mol Ecol 15:3023-34. 2006..Habitat appeared to influence male strategies as the most successful males in open coast environments patrolled offshore, while the most successful male in this study defended a territory along the travel corridor... - Renal effects of fresh water-induced hypo-osmolality in a marine adapted sealR M Ortiz
A316 Earth and Marine Sciences, Department of Biology, University of California Santa Cruz, Santa Cruz, CA 95064, USA
J Comp Physiol B 172:297-307. 2002..Urea excretion appears to be a significant mechanism by which NES pups sustain electrolyte resorption during conditions that can negatively affect ionic homeostasis such as prolonged fasting... - Stroke volume and cardiac output in juvenile elephant seals during forced divesSheila J Thornton
Department of Zoology, University of British Columbia, Vancouver, Canada
J Exp Biol 208:3637-43. 2005..In this study, the degree of bradycardia during diving was less than in previous pinniped studies, suggesting that the reduction in vagal input may contribute to the observed increase in Vs... - The shifting baseline of northern fur seal ecology in the northeast Pacific OceanSeth D Newsome
Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015, USA
Proc Natl Acad Sci U S A 104:9709-14. 2007..P., long before European contact. The relative roles of human hunting versus climatic factors in explaining this ecological shift are unclear, as more paleoclimate information is needed from the coastal zone... 
Stroke frequency, but not swimming speed, is related to body size in free-ranging seabirds, pinnipeds and cetaceansKatsufumi Sato
International Coastal Research Centre, Ocean Research Institute, The University of Tokyo, 2 106 1 Akahama, Otsuchi, Iwate 028 1102, Japan
Proc Biol Sci 274:471-7. 2007..These results suggest that muscle characteristics may constrain swimming during cruising travel, with convergence among diving specialists in the proportions and contraction rates of propulsive muscles...- Renal responses to plasma volume expansion and hyperosmolality in fasting seal pupsRudy M Ortiz
NASA ARC
Am J Physiol Regul Integr Comp Physiol 282:R805-17. 2002..Fasting pups appear to have well-developed kidneys capable of both extreme conservation and excretion of Na(+)... - PCBs and DDT in the serum of juvenile California sea lions: associations with vitamins A and E and thyroid hormonesCathy Debier
Unite de Biochimie de la Nutrition, Universite Catholique de Louvain, Croix du Sud 2 8, B 1348 Louvain la Neuve, Belgium
Environ Pollut 134:323-32. 2005..1). As juvenile California sea lions are useful sentinels of coastal contamination, the high levels encountered in their serum is cause for concern about the ecosystem health of the area... - Control of pulmonary surfactant secretion in adult California sea lionsNatalie J Miller
Environmental Biology, School of Earth and Environmental Sciences, University of Adelaide, Adelaide SA 5005, Australia
Biochem Biophys Res Commun 313:727-32. 2004....