Physiological and biochemical basis of basal metabolic rates in Brandt's voles (Lasiopodomys brandtii) and Mongolian gerbils (Meriones unguiculatus)

Li, Yong-Guo; Yan, Zhong-Cheng; Wang, Dehua

doi:10.1016/j.cbpa.2010.06.183

Cited by 44 publications

(35 citation statements)

References 51 publications

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“…Both RMR and T 3 levels varied with seasonal changes in food availability and T a , and thus T 3 could have a direct influence on RMR, as indicated by several laboratory studies (Banta and Holcombe, 2002;Joos and John-Alder, 1990;Li et al, 2010). To our knowledge, this study is the first to examine seasonal changes in the relationship between thyroid hormone levels and RMR in a freeliving mammal.…”

Section: Discussionmentioning

confidence: 74%

“…Accordingly, a positive relationship between thyroid hormone levels and metabolic rate has been found in captive reptiles (Joos and John-Alder, 1990), birds (Vézina et al, 2009) and mammals (Banta and Holcombe, 2002;Brinkmann et al, 2016;Li et al, 2010), including humans (reviewed in Hulbert, 2000;Kim, 2008). In contrast, other studies report no relationship between metabolic rate and thyroid hormones in captive mammals (Nilssen et al, 1984;Ostrowski et al, 2006), including humans (Bernstein et al, 1983;Johnstone et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Both thyroid hormone levels and resting metabolic rate decrease in African striped mice when food availability decreases

Rimbach

Pillay

Schradin

2016

Journal of Experimental Biology

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In response to variation in food availability and ambient temperature (T a ), many animals show seasonal adaptations in their physiology. Laboratory studies showed that thyroid hormones are involved in the regulation of metabolism, and their regulatory function is especially important when the energy balance of an individual is compromised. However, little is known about the relationship between thyroid hormones and metabolism in free-living animals and animals inhabiting seasonal environments. Here, we studied seasonal changes in triiodothyronine (T 3 ) levels, resting metabolic rate (RMR) and two physiological markers of energy balance (blood glucose and ketone bodies) in 61 free-living African striped mice (Rhabdomys pumilio) that live in an semi-arid environment with food shortage during the dry season. We predicted a positive relationship between T 3 levels and RMR. Further, we predicted higher T 3 levels, blood glucose levels and RMR, but lower ketone body concentrations, during the moist season when food availability is high compared with summer when food availability is low. RMR and T 3 levels were negatively related in the moist season but not in the dry season. Both RMR and T 3 levels were higher in the moist than in the dry season, and T 3 levels increased with increasing food availability. In the dry season, blood glucose levels were lower but ketone body concentrations were higher, indicating a change in substrate use. Seasonal adjustments in RMR and T 3 levels permit a reduction of energy expenditure when food is scarce, and reflect an adaptive response to reduced food availability in the dry season.

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Section: Discussionmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Both thyroid hormone levels and resting metabolic rate decrease in African striped mice when food availability decreases

Rimbach

Pillay

Schradin

2016

Journal of Experimental Biology

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“…Oxygen consumption rates were measured at 30±0.5°C, which is within the thermal neutral zone of Chinese bulbuls (Zheng et al, 2008a). Baseline O 2 concentrations were obtained before and after each test (Li et al, 2010). All measurements of gas exchange were obtained during the resting phase of the birds' circadian cycles (between 20:00 h and 24:00 h) in darkened chambers when individual birds could reasonably be expected to be postabsorptive.…”

Section: Measurement Of Metabolic Ratementioning

confidence: 99%

Temperature and photoperiod as environmental cues affect body mass and thermoregulation in Chinese bulbulsPycnonotus sinensis

Zhu

Lin

et al. 2017

Journal of Experimental Biology

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Seasonal changes in temperature and photoperiod are important environmental cues used by small birds to adjust their body mass (M b ) and thermogenesis. However, the relative importance of these cues with respect to seasonal adjustments in M b and thermogenesis is difficult to distinguish. In particular, the effects of temperature and photoperiod on energy metabolism and thermoregulation are not well known in many passerines. To address this problem, we measured the effects of temperature and photoperiod on M b , energy intake, resting metabolic rate (RMR), organ mass and physiological and biochemical markers of metabolic activity in the Chinese bulbul (Pycnonotus sinensis). Groups of Chinese bulbuls were acclimated in a laboratory to the following conditions: (1) warm and long photoperiod, (2) warm and short photoperiod, (3) cold and long photoperiod, and (4) cold and short photoperiod, for 4 weeks. The results indicate that Chinese bulbuls exhibit adaptive physiological regulation when exposed to different temperatures and photoperiods. M b , RMR, gross energy intake and digestible energy intake were higher in cold-acclimated than in warm-acclimated bulbuls, and in the short photoperiod than in the long photoperiod. The resultant flexibility in energy intake and RMR allows Chinese bulbuls exposed to different temperatures and photoperiods to adjust their energy balance and thermogenesis accordingly. Cold-acclimated birds had heightened state-4 respiration and cytochrome c oxidase activity in their liver and muscle tissue compared with warmacclimated birds indicating the cellular mechanisms underlying their adaptive thermogenesis. Temperature appears to be a primary cue for adjusting energy budget and thermogenic ability in Chinese bulbuls; photoperiod appears to intensify temperature-induced changes in energy metabolism and thermoregulation.

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“…During the measurement of metabolic rates, we pumped dry CO 2 -free air through the chamber at 300 mL/min with a flow control system (AEI technologies R-1, USA) calibrated to ±1 % accuracy with a general purpose thermal mass flow-meter (TSI 4100 Series, USA), to maintain the fractional concentration of O 2 in the chamber at about 20 % (McNab 2006). We obtained the baseline O 2 concentration before and after each test (Li et al 2010;Wu et al 2015). We measured oxygen consumption rates at 30 ± 0.5 °C, which is within the thermal neutral zone for Bramblings, Little Buntings and Eurasian Tree Sparrows (Zheng et al 2008b(Zheng et al , 2014b.…”

Section: Measurement Of Metabolic Ratementioning

confidence: 99%

Relationships between interspecific differences in the mass of internal organs, biochemical markers of metabolic activity, and the thermogenic properties of three small passerines

Bai

Cai

et al. 2016

Avian Res

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Background:The capacity for thermogenesis is considered part of an animal's adaptive strategy for survival, and basal metabolic rate (BMR) is one of the fundamental physiological standards for assessing the energy cost of thermoregulation in endotherms. BMR has been shown to be a highly flexible phenotypic trait both between, and within, species, but the metabolic mechanisms involved in the regulation of BMR, which range from variation in organ mass to biochemical adjustments, remain unclear. In this study, we investigated the relationship between organ mass, biochemical markers of metabolic tissue activity, and thermogenesis, in three species of small passerines: wild Bramblings (Fringilla montifringilla), Little Buntings (Emberiza pusilla) and Eurasian Tree Sparrows (Passer montanus), caught in Wenzhou, southeastern China. Methods:Oxygen consumption was measured using an open-circuit respirometry system. Mitochondrial state-4 respiration and cytochrome c oxidase (COX) activity in liver and pectoral muscle were measured with a Clark electrode. Results:Our results show that Eurasian Tree Sparrows had significantly higher BMR, digestive organ mass, mitochondrial state-4 respiration capacity and COX activity in liver and muscle, than Bramblings and Little Buntings. Furthermore, interspecific differences in BMR were strongly correlated with those indigestive tract mass, state-4 respiration and COX activity. Conclusions:Our findings suggest that the digestive organ mass, state-4 respiration and COX activity play an important role in determining interspecific differences in BMR.

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Physiological and biochemical basis of basal metabolic rates in Brandt's voles (Lasiopodomys brandtii) and Mongolian gerbils (Meriones unguiculatus)

Cited by 44 publications

References 51 publications

Both thyroid hormone levels and resting metabolic rate decrease in African striped mice when food availability decreases

Both thyroid hormone levels and resting metabolic rate decrease in African striped mice when food availability decreases

Temperature and photoperiod as environmental cues affect body mass and thermoregulation in Chinese bulbulsPycnonotus sinensis

Relationships between interspecific differences in the mass of internal organs, biochemical markers of metabolic activity, and the thermogenic properties of three small passerines

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