... demonstrate that the hooded seal ( Cystophora cristata ), a deep-diving Arctic pinniped, shows strong daily patterning of diving behaviour in the wild. Cultures of hooded seal skin fibroblasts exhibit robust circadian oscillation of the core clock genes per2 and arntl . In liver tissue collected from captive...

... Ltd 2023 Summary: Efficient neurotransmission supported by increased sphingomyelin and reduced glutamate levels, as well as increased glycolytic capacity, may contribute to the hypoxia tolerance of the pinniped brain. Lipidome Hypoxia Oxidative stress Marine mammals Pinniped Brain...

... elephant seal). Power output and mechanical COT were compared for all four pinniped species by tracking the animals' center of mass. The quadrupedal gait of sea lions showed lower vertical displacements of the center of mass, and higher velocities compared with the terrestrial gait of phocids. Northern...

... attributed. Summary: Harbour seals are vocal learners that can escape acoustic allometry despite complying with anatomical allometric constraints. Advanced neural control over their vocal organs may allow them to break acoustic allometry. Pinniped Harbour seal Vocal anatomy Acoustic...

..., cardiorespiratory system and other attributes of diving physiology for pinnipeds and cetaceans to assess how physiological immaturity makes young marine mammals vulnerable to disturbance. Generally, the duration required for body oxygen stores to mature varies across species in accordance with the maternal...

... is not associated with oxidative stress in Weddell seals, suggesting that protection against diving-related increases in ROS generation is maintained into old age in these animals. Pinniped Aging Senescence Antioxidants Redox Ischemia–reperfusion Diving vertebrates employ a physiological diving...

...), and exhibited behavioral flexibility when targeting whole prey in controlled feeding trials with four prey treatments. Suction feeding and biting are common pinniped feeding strategies ( Werth, 2000 ; Hocking et al., 2017 ; Kienle et al., 2017 ) and are widely used by many diverse aquatic taxa, including...

... strategy for these species, indicating that skull morphology alone does not capture the true diversity of feeding behaviors used by pinnipeds. The ability of all four species to use more than one feeding strategy is likely advantageous for foraging in spatially and temporally dynamic marine ecosystems...

... effects of lung collapse and bubble formation. Innate immunity Cytokine IL6 Endotoxin Pinniped Marine mammals such as pinnipeds (seals and sea lions) are highly specialized predators that pursue and capture prey while breath-holding. During these dives they draw down their body oxygen...

..., if any, de novo production from glucose or ketone precursors within the mammary gland ( Fowler et al., 2014 ). Thus, the source of lipid in pinniped milk is likely derived predominantly from maternal lipid stores rather than de novo synthesis. The high degree of similarity between fatty acids...

... - 1484 . Miersch , L. , Hanke , W. , Wieskotten , S. , Hanke , F. D. , Oeffner , J. , Leder , A. , Brede , M. , Witte , M. and Dehnhardt , G. ( 2011 ). Flow sensing by pinniped whiskers . Philos. Trans. R. Soc. B Biol. Sci.   366 , 3077 - 3084 . 10.1098/rstb...

... a source of sensory information for seals (Pinnipedia) in the detection of prey fish. KEY WORDS: Vibrissae Pinniped Benthic prey Foraging Hydrodynamic sensory system Harbour seals are food generalists and feed on pelagic as well as benthic prey fish ( Bowen et al., 2002 ; Sharples et al...

... Summary: Regional variation in diving ability and behavior of the South American sea lion suggests that exposure to different habitats and geographical locations better explains oxygen storage capacities and diving capability than body size alone. Aerobic dive limit Diving Oxygen stores Pinniped...

...Kristina S. Ydesen; Danuta M. Wisniewska; Janni D. Hansen; Kristian Beedholm; Mark Johnson; Peter T. Madsen A key component in understanding the ecological role of marine mammal predators is to identify how and where they capture prey in time and space. Satellite and archival tags on pinnipeds...

... Resting Pinniped The diving physiology and capabilities of breath-hold divers are crucial to their ability to exploit prey resources, thereby influencing their role in the ecosystem. The dive capacity of breath-hold divers is dependent on both the available O 2 stores and the rate at which the O...

.... * Author for correspondence ( [email protected] ) 29 11 2011 5 4 2012 © 2012. 2012 sexual dimorphism fasting body composition field metabolic rate pinniped Energy used for reproduction comes from body reserves in ‘capital breeding’ animals. Body reserves available...

... to pinnipeds, ASSRs elicited by single and multiple simultaneous tones were used to measure aerial hearing thresholds in several California sea lions ( Zalophus californianus ) and Steller sea lions ( Eumetopias jubatus ). There were no significant differences between thresholds measured using the single...

... are discussed in the light of pinniped sensory biology and potential biomimetic applications. Fig. 2. Head-mounted camera. (A) Position of the head-mounted camera (red ellipse) fixed to the eye-mask that the seal is wearing. The head-mounted camera monitored the position and movements of the whiskers while...

... stores aerobic dive limit pinniped Zalophus californianus For air-breathing vertebrates, an individual's ability to acquire food resources in the marine environment results from the interaction between an animal's behavior and its physiological capability, both of which may vary by age, body...

...Rebecca R. Watson; Todd A. Miller; Randall W. Davis SUMMARY There is strong evidence that pinnipeds maintain a lipid-based, aerobic metabolism during diving. However, the few fiber-typing studies performed on pinniped skeletal muscles are not consistent with an aerobic physiological profile...