... both energy expenditure and intake in 48 Adélie penguins ( Pygoscelis adeliae ) during the chick-rearing stage. We employed the machine learning algorithm random forest (RF) to predict accelerometry-derived metrics for feeding behaviour using depth data (our proxy for energy acquisition). We also built...

... acceleration (ODBA) derived from accelerometer data is widely used as a proxy for energy expenditure (EE) in free-ranging animals, its utility has not been tested in species that predominately use body rotations or exploit environmental energy for movement. We tested a suite of sensor-derived movement metrics...

... that both variables fluctuate along with variation in energy expenditure, independently of the trigger. Exposure to the two stimuli occurring subsequently did not cause a difference in GC or glucose responses compared with exposure to a single stimulus, suggesting a limited capacity to respond...

... ; Smith, 1981 ). While white muscle K s values are much lower than liver or gut, white muscle makes up ∼50–60% of the body mass. Therefore, its overall contribution to whole-animal energy expenditure is significant ( Milligan, 1996 ). Studies in Arctic char and rainbow trout have reported...

... that inhabit marine environments. There is therefore a demand for a framework through which to estimate energy expenditure from readily available data. We present the energetic costs associated with important time- and energy-intensive behaviours across nine families of marine bird (including seabirds, ducks...

... with real time physiological measurements; energy expenditure, water loss rate and respiratory exchange rate, to characterize the response to water deprivation. Mice without access to water had significantly lower energy expenditures and in turn, reduced water loss compared to mice with access to water...

...Mason R. Cole; Colin Ware; Elizabeth A. McHuron; Daniel P. Costa; Paul J. Ponganis; Birgitte I. McDonald ABSTRACT Diving is central to the foraging strategies of many marine mammals and seabirds. Still, the effect of dive depth on foraging cost remains elusive because energy expenditure...

... to be facultative rather than obligate in many fish species ( Kolok, 1991 ; Suski and Ridgway, 2009 ; Hasler et al., 2009 ). Lethargic or dormant fish species may simply prioritize activity reduction in the cold to minimize energy expenditure. This prioritization may lead to the evolution of a consistent adaptive...

... habitat selection by moose . J. Wildl. Manage.   79 , 505 - 512 . 10.1002/jwmg.859 Szafrańska , P. A. , Zub , K. , Wieczorek , M. , Książek , A. , Speakman , J. R. and Konarzewski , M. ( 2014 ). Shaving increases daily energy expenditure in free-living root voles . J...

... that of novel or aversive odors, fox odor or moderate restraint stress. Exposure to predator odor increased energy expenditure, and both the thermogenic and energetic effects persisted when physical activity levels were controlled. Predator odor-induced muscle thermogenesis is subject to associative learning...

...: McNabb, 2006 ; and the HPA axis: Jimeno et al., 2017 ; Landys et al., 2006 ]. Several studies have shown that these two axes and circulating levels of CORT and thyroid hormones are positively correlated with RMR, activity and energy expenditure in vertebrates (corticosterone: Astheimer et al., 1992...

... ability . Nat. Neurosci.   17 , 312 - 321 . 10.1038/nn.3616 Zarrugh , M. Y. , Todd , F. N. and Ralston , H. J. ( 1974 ). Optimization of energy expenditure during level walking . Eur. J. Appl. Physiol. Occup. Physiol.   33 , 293 - 306 . 10.1007/BF00430237 Funding...

... over the active season under flea-augmented and control conditions. We also measured the prevalence of an internal parasite ( Trypanosoma otospermophili ). Doubly labeled water (DLW) was intra-peritoneally injected at peak lactation to examine energy expenditure. Effects of parasites on oxidative...

... of the implications: regression dilution results in an underestimation of the true slope value. This is particularly problematic when the slope value is diagnostic. For example, energy management strategies of animals can be determined from the regression slope estimate of mean energy expenditure against resting...

... association to be significantly steeper in the hard foraging environment. This supports the metabolic explanation of GC variation, underlining the importance of accounting for variation in energy expenditure when interpreting GC variation. References Blas , J. ( 2015 ). Stress in birds...

... demonstrate a high metabolic sensitivity to an acute temperature increase, as well as the metabolic responses to stress. Gastrointestinal Teleost Oxygen consumption Metabolism Energy expenditure The gut is a multifunctional organ system responsible for a range of crucial, intricately linked...

... energy expenditure, enhance thermoregulatory capacity and adjust functioning of the hypothalamic-pituitary-adrenal (HPA) axis to match the winter increase in energy demands. Within each season, stress plays an important role in the flexible adjustments of a phenotype to environmental perturbations...

... an ecological perspective. When animals move through their environment, they encounter topographical variation, and this is a key factor that can dramatically affect their energy expenditure. We collated published data on the costs for birds and mammals to locomote terrestrially on inclines, and investigated...

...: 5°C (similar to minimum nighttime temperatures during early breeding), 15°C (similar to nighttime temperatures during late breeding) and 28°C (thermal neutrality). Nest use alone had modest effects: even for solitary babblers at 5°C, it reduced nighttime energy expenditures by <15%. However...

... no competing or financial interests. 8 2 2016 2 6 2016 © 2016. Published by The Company of Biologists Ltd 2016 Summary: Thyroid hormones and energy expenditure are correlated in a semi-free-living ungulate. Energy expenditure Food restriction Resting heart rate Horses...