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Data from: Does habitat fragmentation promote climate-resilient phenotypes?
- 负责人：
- DOI：
- doi:10.5061/dryad.5620vc8
- 摘要：
- (M); the upper limit to heat production) and basal metabolic rate (BMR; the lower limit related to energy acquisition and processing) often constrain aspects
Data from: Speeding up growth: selection for mass-independent maximal metabolic rate alters growth rates
- 负责人：
- DOI：
- doi:10.5061/dryad.7vd0j
- 摘要：
- (BMR). In contrast, investigators rarely examine maximal metabolic rate (MMR) as a relevant metric of energy metabolism, even though it indic
Data from: Climate change and temporal trends in body size: the case of rodents
- 负责人：
- DOI：
- doi:10.5061/dryad.3q67545
- 摘要：
- and basal metabolic rate (BMR) for each species. We found that: 1) ten species (58.8%) showed no significant changes in mb, while the remaining seven species (41
Data from: Locomotion during digestion changes current estimates of seed dispersal kernels by fish
- 负责人：
- DOI：
- doi:10.5061/dryad.72ft2
- 摘要：
- plant species (Carex acuta and C. riparia) by the common carp (Cyprinus carpio) subjected to three different activity levels: low (basal metabolic rate, BMR
Data from: Resting and daily energy expenditures during reproduction are adjusted in opposite directions in free-living birds
- 负责人：
- 关键词：
- BMR daily energy expenditure body temperature doubly-labeled water endothermy field metabolic rate hypothermia resting metabolic rate
- DOI：
- doi:10.5061/dryad.t9q56
- 摘要：
- 1. Reproduction is energetically expensive, and daily energy expenditure (DEE) often peaks during the period of rearing young. The “potentiation” hypothesis predicts that high DEE needs to be sustained by a corresponding up-regulation of metabolic machinery, thus a concomitant increase of the resting metabolic rate (RMR) is expected. Alternatively, the “compensation” hypothesis predicts that DEE and RMR are regulated independently and animals may maintain low RMR to maximize the energy available for reproduction. This might particularly be the case if DEE was limited, e.g. by extrinsic food supply or intrinsic physiological factors. 2. We tested these hypotheses in free-living seabirds by manipulating their energy demands (experimentally reduced or increased brood size) and supplies (providing supplemental food), and simultaneously measuring their DEE and RMR (by the doubly-labeled water method and an indirect hormonal proxy, respectively). 3. In support of the ‘compensation’ hypothesis, metabolic rates were adjusted independently and in opposite directions with an increase of DEE and a decrease of the hormonal proxy for RMR in individuals rearing young compared to birds with removed broods. Energy expenditure of unfed birds with chicks appeared to be limited as experimental brood enlargement did not cause an increase in DEE. Supplemental feeding did not allow DEE to exceed this apparent limitation. 4. We propose that a reduction of the resting metabolism is a strategy to increase allocation of energy to reproduction when DEE is constrained, and that this constraint is unlikely to be related to food supply.
Data from: Hummingbirds budget energy flexibly in response to changing resources
- 负责人：
- DOI：
- doi:10.5061/dryad.r18r8p1
- 摘要：
- 1. Managing energy stores in response to variable resource availability is a key component to individual fitness, yet because directly measuring energy budgets is difficult, daily energy management is rarely measured. 2. Hummingbirds’ energy management is relatively simple to model compared to other endotherms because they have high mass-specific metabolic rates and store little fat. 3. We determined which aspects of the hummingbird daily energy budget (i.e. thermoregulation, daytime activity costs, nighttime costs) change at the individual level in response to environmental variation. 4. We found that daily energy expenditure varied three-fold in two populations of broad-billed hummingbirds (Cynanthus latirostris). 5. Our model indicated the energy budget was distributed in the following proportions: daytime activity, 59% (range 22-84%); thermoregulation, 23% (11 – 32%), basal metabolism, 7% (3 – 16%), and nighttime energy 17% (6 – 37%). Activity costs were higher at the hotter, homogeneous site and during the early-wet season at both sites. 6. Increased daily energy expenditure was related to decreased nectar availability, and not significantly related to temperature or bird mass. With climate change, the indirect energetic costs of shifting resources could have greater impacts on endotherm energy budgets than direct costs such as thermoregulation. Increased foraging and activity costs could decrease the energy available to birds for somatic repair and reproduction, potentially causing differential fitness across seasons and sites.
Data from: Early life experience drives short-term acclimation of metabolic and osmoregulatory traits in the leaf-eared mouse
- 负责人：
- DOI：
- doi:10.5061/dryad.cn8mk
- 摘要：
- d lower basal metabolic rate (BMR), lower total evaporative water loss (TEWL), and body mass (Mb) compared to those developing in the cold treatment; neve
Data from:Physiological effects of increased foraging effort in a small passerine
- 负责人：
- Yap, Kang Nian
- DOI：
- doi:10.5061/dryad.7qs70
- 摘要：
- - or long-term effects of “training” (3 days and 90 days of “training” respectively) and some of these effects were sex-specific. There were no effects of treatment on BMR
