Repeatability of Daily Field Metabolic Rate in Female Meadow Voles (Microtus pennsylvanicus)

Berteaux, Dominique; Thomas, Donald W.; Bergeron, Jean‐Marie; Lapierre, H.

doi:10.2307/2390510

Cited by 93 publications

(74 citation statements)

References 30 publications

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“…It is worth noting here that of these 19 DEE measurements, 14 were made on reproductive individuals. Thus, our results support the conjecture of Berteaux and colleagues (Berteaux et al, 1996) that repeatability of DEE in wild animals is more likely to be obtained during energydemanding periods, such as during periods of cold exposure or reproduction (see also Fyhn et al, 2001). The significant repeatability of DEE in eastern chipmunks raises the possibility that this trait is heritable and thus may respond to selection (see Bergeron et al, 2011a), or be genetically correlated with other traits such as animal personality (Careau et al, 2008;Careau and Garland, 2012).…”

Section: Repeatability Of Dee and Rmrsupporting

confidence: 88%

Context-dependent correlation between resting metabolic rate and daily energy expenditure in wild chipmunks

Careau

Réale

Garant

et al. 2012

Journal of Experimental Biology

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SUMMARYSeveral empirical studies have shown that variation in daily energy expenditure (DEE) and resting metabolic rate (RMR) is influenced by environmental and individual factors, but whether these shared influences are responsible for, or independent of, relationships between DEE and RMR remains unknown. The objectives of this study were to (i) simultaneously evaluate the effects of environmental and individual variables on DEE and RMR in free-ranging eastern chipmunks (Tamias striatus) and (ii) quantify the correlation between DEE and RMR before and after controlling for common sources of variation. We found that the influence of individual factors on DEE and RMR is most often shared, whereas the influence of environmental factors tends to be distinct. Both raw and mass-adjusted DEE and RMR were significantly correlated, but this correlation vanished after accounting for the shared effect of reproduction on both traits. However, within reproductive individuals, DEE and RMR remained positively correlated after accounting for all other significant covariates. The ratio of DEE to RMR was significantly higher during reproduction than at other times of the year and was negatively correlated with ambient temperature. DEE and RMR appear to be inherently correlated during reproduction, but this correlation does not persist during other, less energy-demanding periods of the annual cycle. Supplementary material available online at

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Section: Repeatability Of Dee and Rmrsupporting

confidence: 88%

Context-dependent correlation between resting metabolic rate and daily energy expenditure in wild chipmunks

Careau

Réale

Garant

et al. 2012

Journal of Experimental Biology

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“…Intra-and inter-individual variations were considered to be only noise, reducing the capacity of statistical tests to detect differences between groups. Berteaux et al (1996) however showed that inter-individual differences, in physiological characteristics for example, may represent biological relevant variation rather than random noise and that inter-individual variability is the raw material upon which natural selection acts. Selection (natural or artificial) can favour the coexistence of different types of behaviour patterns, referred to as 'strategies' within a population (Jensen, 1995).…”

Section: Discussionmentioning

confidence: 99%

Voluntary intake and digestibility in horses: effect of forage quality with emphasis on individual variability

Edouard

Fleurance

Martin‐Rosset

et al. 2008

Animal

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Food intake is a key biological process in animals, as it determines the energy and nutrients available for the physiological and behavioural processes. In herbivores, the abundance, structure and quality of plant resources are known to influence intake strongly. In ruminants, as the forage quality declines, digestibility and total intake decline. Equids are believed to be adapted to consume high-fibre low-quality forages. As hindgut fermenters, it has been suggested that their response to a reduction in food quality is to increase intake to maintain rates of energy and nutrient absorption. All reviews of horse nutrition show that digestibility declines with forage quality; for intake, however, most studies have found no significant relationship with forage quality, and it has even been suggested that horses may eat less with declining forage quality similarly to ruminants. A weakness of these reviews is to combine data from different studies in meta-analyses without allowing the differences between animals and diets to be controlled for. In this study, we analysed a set of 45 trials where intake and digestibility were measured in 21 saddle horses. The dataset was analysed both at the group (to allow comparisons with the literature) and at the individual levels (to control for individual variability). As expected, dry matter digestibility declined with forage quality in both analyses. Intake declined slightly with increasing fibre contents at the group level, and there were no effects of crude protein or dry matter digestibility on intake. Overall, the analysis for individual horses showed a different pattern: intake increased as digestibility and crude protein declined, and increased with increasing fibre. Our analysis at the group level confirms previous reviews and shows that forage quality explains little of the variance in food intake in horses. For the first time, using mixed models, we show that the variable 'individual' clarifies the picture, as the horses showed different responses to a decrease in forage quality: some compensated for the low nutritional value of the forages by increasing intake, few others responded by decreasing intake with declining forage quality, but not enough to cause any deficit in their energy and protein supplies. On the whole, all the animals managed to meet their maintenance requirements. The individual variability may be a by-product of artificial selection for performance in competition in saddle horses.

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“…Previous work has indicated the accuracy of this method to measure DEE in small mammals (Speakman and Król, 2005b). Measurements were made across 2 days to minimise the potential day-today variability in DEE (Speakman et al, 1994;Berteaux et al, 1996). Recycling of isotopes between the mother and her pups was considered negligible (Scantlebury et al, 2000).…”

Section: Deementioning

confidence: 99%

Limits to sustained energy intake. XXII. Reproductive performance of two selected mouse lines with different thermal conductance

Jothery

Król

Hawkins

et al. 2014

Journal of Experimental Biology

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Maximal sustained energy intake (SusEI) appears limited, but the factors imposing the limit are disputed. We studied reproductive performance in two lines of mice selected for high and low food intake (MH and ML, respectively), and known to have large differences in thermal conductance (29% higher in the MH line at 21°C). When these mice raised their natural litters, their metabolisable energy intake significantly increased over the first 13 days of lactation and then reached a plateau. At peak lactation, MH mice assimilated on average 45.3% more energy than ML mice (222.9±7.1 and 153.4±12.5 kJ day −1 , N=49 and 24, respectively). Moreover, MH mice exported on average 62.3 kJ day −1 more energy as milk than ML mice (118.9±5.3 and 56.6±5.4 kJ day, N=subset of 32 and 21, respectively). The elevated milk production of MH mice enabled them to wean litters (65.2±2.1 g) that were on average 50.2% heavier than litters produced by ML mothers (43.4±3.0 g), and pups that were on average 27.2% heavier (9.9±0.2 and 7.8±0.2 g, respectively). Lactating mice in both lines had significantly longer and heavier guts compared with non-reproductive mice. However, inconsistent with the 'central limit hypothesis', the ML mice had significantly longer and heavier intestines than MH mice. An experiment where the mice raised litters of the opposing line demonstrated that lactation performance was not limited by the growth capacity of offspring. Our findings are consistent with the idea that the SusEI at peak lactation is constrained by the capacity of the mothers to dissipate body heat.

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Repeatability of Daily Field Metabolic Rate in Female Meadow Voles (Microtus pennsylvanicus)

Cited by 93 publications

References 30 publications

Context-dependent correlation between resting metabolic rate and daily energy expenditure in wild chipmunks

Context-dependent correlation between resting metabolic rate and daily energy expenditure in wild chipmunks

Voluntary intake and digestibility in horses: effect of forage quality with emphasis on individual variability

Limits to sustained energy intake. XXII. Reproductive performance of two selected mouse lines with different thermal conductance

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