Search Results - (Author, Cooperation:D. P. Costa)
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1Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2018-03-21Publisher: National Academy of SciencesPrint ISSN: 0027-8424Electronic ISSN: 1091-6490Topics: BiologyMedicineNatural Sciences in GeneralPublished by: -
2Latest Papers from Table of Contents or Articles in PressB. A. Block ; I. D. Jonsen ; S. J. Jorgensen ; A. J. Winship ; S. A. Shaffer ; S. J. Bograd ; E. L. Hazen ; D. G. Foley ; G. A. Breed ; A. L. Harrison ; J. E. Ganong ; A. Swithenbank ; M. Castleton ; H. Dewar ; B. R. Mate ; G. L. Shillinger ; K. M. Schaefer ; S. R. Benson ; M. J. Weise ; R. W. Henry ; D. P. Costa
Nature Publishing Group (NPG)
Published 2011Staff ViewPublication Date: 2011-06-24Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Animal Identification Systems ; Animal Migration ; Animals ; Aquatic Organisms/*physiology ; Bayes Theorem ; Biodiversity ; California ; Climate ; *Ecosystem ; Locomotion/*physiology ; North America ; Pacific Ocean ; Population Dynamics ; Predatory Behavior/*physiology ; Seasons ; Species Specificity ; Water Movements ; WildernessPublished by: -
3Latest Papers from Table of Contents or Articles in PressHazen, E. L., Scales, K. L., Maxwell, S. M., Briscoe, D. K., Welch, H., Bograd, S. J., Bailey, H., Benson, S. R., Eguchi, T., Dewar, H., Kohin, S., Costa, D. P., Crowder, L. B., Lewison, R. L.
American Association for the Advancement of Science (AAAS)
Published 2018Staff ViewPublication Date: 2018-05-31Publisher: American Association for the Advancement of Science (AAAS)Electronic ISSN: 2375-2548Topics: Natural Sciences in GeneralPublished by: -
4Latest Papers from Table of Contents or Articles in PressPagano, A. M., Durner, G. M., Rode, K. D., Atwood, T. C., Atkinson, S. N., Peacock, E., Costa, D. P., Owen, M. A., Williams, T. M.
American Association for the Advancement of Science (AAAS)
Published 2018Staff ViewPublication Date: 2018-02-03Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyGeosciencesComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Ecology, PhysiologyPublished by: -
5Articles: DFG German National LicensesCastellini, M. A. ; Costa, D. P. ; Castellini, J. M.
Oxford, UK : Blackwell Publishing Ltd
Published 1992Staff ViewISSN: 1748-7692Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: BiologyType of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 1432-0762Source: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Summary Intraspecific allometry of pup mass as a function of maternal mass was analysed in Antarctic fur seals (Arctocephalus gazella), a highly dimorphic species. The allometric exponent was 0.6, much lower than in interspecific comparisons. Slopes were the same for mother-son pairs as for mother-daughter pairs, but adjusted means were significantly higher for the former, indicating higher reproductive effort of mothers of sons. The correlation of maternal mass with pup mass explained 59% of the variance in female pup mas but only 18% of that in male pup mass. Females appeared to produce sons which were as big as possible. Relative pup mass decreased with increasing maternal mass indicating a lower reproductive effort of bigger and presumably older mothers, contrary to expectations from life history theory. Sex ratio of pups showed no relation to maternal mass.Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 1432-136XSource: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineNotes: Summary The turnover of two plasma free fatty acids (FFA) were measured in 5 northern elephant seal pups (Mirounga angustirostris) after approximately 2 months of post-weaning fasting. Turnover was determined using simultaneous bolus injections of14C-palmitate,3H-oleate and Evans blue (EB) administered via an indwelling extradural intravertebral catheter. At this time in their natural fast, the seals exhibited plasma FFA levels and turnover values higher than reported for other marine mammals and most terrestrial carnivores. There was no consistent difference between plasma FFA turnover measured by palmitate or oleate tracers. The results imply that FFA metabolism is the primary source of energy during fasting. This is interesting in light of previous observations of minimal ketoacid accumulation and low levels of glucose and protein energy production during fasting in these juvenile seals.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesWater conservation and protein metabolism in northern elephant seal pups during the postweaning fastStaff View
ISSN: 1432-136XKeywords: Glomerular filtration rate ; Fasting ; Water conservation ; Protein catabolism ; Elephant seal, MiroungaSource: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineNotes: Abstract Urine production and N output were monitored in northern elephant seal (Mirounga angustirostris) pups progressing through 10 weeks of a natural postweaning fast. Urine output declind by 84% (to 69±12 ml·day−1) at 10 weeks (P〈0.05). Glomerular filtration rate at 10 weeks was 51% of the 67±3 ml serum·min−1 observed during week 1 (P〈0.05). Urine N excretion fell by 69% to 1.2±0.17 g·day−1, while urinary concentration increased (P〈0.05). Serum urea declined from an initial 11 mmol·1−1 to 5–7 mmol·1−1 by 5 weeks. The fall in urinary N loss (and thus amino acid oxidation) was concomitant with depressed metabolic rate. Therefore, protein contributed little toward meeting energy demands (i.e., 〈4% of average metabolic rate) throughout fasting. These data indicate that fasting pups improve water conservation and minimize protein catabolism during prolonged natural fasts without an exogenous source of water.Type of Medium: Electronic ResourceURL: