Metabolic rate and thermoregulation in two species of tuco-tuco, Stenomys talarum and Ctenomys australis (Caviomorpha, Octodontidae)

Busch, Christina

doi:10.1016/0300-9629(89)90048-0

Cited by 52 publications

(47 citation statements)

References 5 publications

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“…The intervals for the thermoneutral zones obtained in the present study are in accordance with data available for other caviomorph terrestrial rodents such as O. degus (27-35 °C), Thrichomys apereoides Lund, 1839 (25-35 °C), Chinchilla laniger Bennett, 1829 (22-35 °C), Dazyprocta azarae Lichtenstein, 1823 (18-35 °C) (Arends and Mcnab 2001) and fossorial rodents such as Ctenomys talarum Thomas, 1898 (25-35 °C) (Bush 1989). Trinomys setosus showed a relatively broad thermoneutral zone with a lower limit at T a = 25.7 °C extending at least to T a = 32 °C (Fig.…”

Section: Discussionsupporting

confidence: 88%

“…Moreover, C. bishopi seems not be able to cope well with experimental T a = 40 °C, since mortality was observed in the only tested animal at T a = 40 °C. Ctenomys talarum shows a broader thermoneutral zone (25-35 °C) than C. bishopi, but this species was also not able to survive temperatures above its thermoneutral zone at T a = 40 °C (Bush 1989). Such a thermoregulatory constrain may be expected in fossorial rodents as long as burrow temperature variation is predictable and animals are able to use behavioral strategies to avoid overheating, i.e.…”

Section: Discussionmentioning

confidence: 93%

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Temperature and circadian effects on metabolic rate of South American echimyid rodents, Trinomys setosus and Clyomys bishopi (Rodentia: Echimyidae)

Fabio-Braga¹,

Klein²

2018

Zoologia

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ABSTRACT. Basal metabolic rate (BMR) represents the lowest level of metabolic activity capable to sustain homeostasis in an endotherm and is an important tool to compare metabolic rates of different species. Echimyidae is the most specious family within caviomorph rodents, however, little is known about the biology of its species, such as Trinomys setosus (Desmarest, 1817) and Clyomys bishopi (Ávila-Pires & Wutke, 1981), a ground and an underground dwelling echimyid, respectively. The ambient temperature and circadian effects on metabolic rate were evaluated through closed-system respirometry for these two species, as well as the circadian effects on CO 2 production and respiratory exchange ratio (RER). Trinomys setosus and C. bishopi showed the lowest metabolic rates (0.56 ± 0.02 mLO 2 .h , respectively) at 32 °C and during the light phase. Under laboratory conditions, T. setosus showed metabolic rate variation compatible with nocturnal activity, whereas C. bishopi activity cycle remains unclear. Both species showed BMR lower than expected by allometric regressions for rodents.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 93%

Temperature and circadian effects on metabolic rate of South American echimyid rodents, Trinomys setosus and Clyomys bishopi (Rodentia: Echimyidae)

Fabio-Braga¹,

Klein²

2018

Zoologia

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“…V O2 was measured at 25°C [within the range of thermoneutrality for C. talarum (Busch, 1989)] in the morning or in the afternoon, because C. talarum exhibits an arrhythmic pattern of daily activity (Luna et al, 2000). Animal body temperature was recorded after measuring V O2 (Cole Parmer Thermistor 8402-10, YSI probe model 93k73545-402, Vernon Hills, IL, USA; nearest 0.1°C).…”

Section: Measurement Of V O2mentioning

confidence: 99%

“…However, antibody Only pregnant females were considered in the breeding season, because lactating females were not used in this study. Data on energy costs associated with different processes were obtained from previous studies [cellular maintenance (Luna et al, 2002), thermoregulation (Busch 1989), movements (Luna and Antinuchi, 2003), burrow construction (Luna et al, 2002;Antinuchi et al, 2007), and pregnancy (Zenuto et al, 2002a)]. …”

Section: Implications For Interspecific Immunological Variationmentioning

confidence: 99%

“…moisture, low ventilation and protection from UV light) that favour high levels of parasite transmission (Rossin and Malizia, 2002). Additionally, the moist and stagnant conditions of the subterranean environment are hypothesised to have favoured low basal metabolic rate (BMR), observed in C. talarum (Busch, 1989;Luna et al, 2002) and other subterranean rodents, as an adaptation to avoid overheating during digging (McNab, 1966) or to cope with the costs of burrowing (Vleck, 1979;Luna and Antinuchi, 2007;Luna et al, 2009). This low BMR has been associated to other singular traits of this species: tuco-tucos live 'slow pace' reproductive lives; females have a long gestation period (95 days) and give birth to altricial pups (Zenuto et al, 2002a) only twice a year .…”

Section: Introductionmentioning

confidence: 99%

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Mounting a specific immune response increases energy expenditure of the subterranean rodentCtenomys talarum(tuco-tuco): implications for intraspecific and interspecific variation in immunological traits

Cutrera

Zenuto

Luna

et al. 2010

Journal of Experimental Biology

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SUMMARYIt was recently hypothesised that specific induced defences, which require substantial time and resources and are mostly beneficial against repeated infections, are more likely to be favoured in 'slow-living-pace' species. Therefore, understanding how different types of immune defences might vary with life history requires knowledge of the costs and benefits of defence components. Studies that have explored the energetic costs of immunity in vertebrates have done so with a focus primarily on birds and less so on mammals, particularly surface-dwelling rodents. In this study, we evaluated whether an experimental induction of the immune system with a non-pathogenic antigen elevates the energetic expenditure of a subterranean rodent: Ctenomys talarum (tuco-tucos). In both seasons studied, a significant increase in oxygen consumption was verified in immune-

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Varying intensity of simulated infection partially affects the magnitude of the acute‐phase immune response in the subterranean rodent Ctenomys talarum

et al. 2022

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The acute phase response (APR), coordinated by a complex network of components of the immune and neuroendocrine systems, plays a key role in early immune defense. This response can be elicited by a wide variety of pathogens at different intensities (frequencies and doses), hence experimental immune challenges with antigen gradients makes it possible to evaluate sickness progression with a better representation of what occurs in natural systems. However, how infection intensity could shape the APR magnitude in wild species is still poorly understood. Here, the immune response was activated in the subterranean rodent Ctenomys talarum with a gradient of lipopolysaccharide (LPS) doses (0.5, 1, 1.5, and 2 mg/kg of body mass). Changes in body temperature, body mass, and energetic costs were evaluated over time. We also assessed cortisol levels, white blood cells counts and neutrophil: lymphocyte ratios, before and after injection. Results indicated that during the APR, C. talarum shows a hyperthermic response, which is maintained for 6 h, with slight differences among antigen doses in the pattern of thermal response and body mass change. A maximum increase in body temperature of 0.83°C to 1.63°C was observed during the first hour, associated with a metabolic cost that ranged from 1.25 to 1.41 ml O2/gh. Although no clear effects of treatment were detected on leukocyte abundance, we found increments in neutrophil: lymphocyte ratios and gradual increases in cortisol levels corresponding to the intensity of simulated infection, which may indicate redistribution of immune cells and enhancement of immune function. An evident sickness syndrome was observed even at the lowest LPS dose that was characterized by an increase in body temperature, energy expenditure, and N: L ratio, as well as a dose‐dependent increase in cortisol levels. Although in nature, other constraints and challenges could affect the magnitude and costs of immune responses, C. talarum mounts an effective APR with a low increase in their daily energy expenditure, regardless of LPS dose.

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Metabolic rate and thermoregulation in two species of tuco-tuco, Stenomys talarum and Ctenomys australis (Caviomorpha, Octodontidae)

Cited by 52 publications

References 5 publications

Temperature and circadian effects on metabolic rate of South American echimyid rodents, Trinomys setosus and Clyomys bishopi (Rodentia: Echimyidae)

Temperature and circadian effects on metabolic rate of South American echimyid rodents, Trinomys setosus and Clyomys bishopi (Rodentia: Echimyidae)

Mounting a specific immune response increases energy expenditure of the subterranean rodentCtenomys talarum(tuco-tuco): implications for intraspecific and interspecific variation in immunological traits

Varying intensity of simulated infection partially affects the magnitude of the acute‐phase immune response in the subterranean rodent Ctenomys talarum

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