Basal metabolism is correlated with habitat productivity among populations of degus (Octodon degus)

Bozinovic, Francisco; Rojas, José M.; Broitman, Bernardo R.; Vásquez, Rodrigo A.

doi:10.1016/j.cbpa.2008.12.015

Cited by 52 publications

(38 citation statements)

References 27 publications

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“…This has previously been suggested by Auer et al (2015a,b) for ectotherms, and earlier by Mueller and Diamond (2001) and Bozinovic et al (2009) for endotherms. In other words, it appears plausible that the capacity for assimilating energy under conditions of abundant resources is determined adaptively by NAS, as animals with higher NAS would be promoted by selection.…”

Section: Discussionsupporting

confidence: 77%

Is Maximum Food Intake in Endotherms Constrained by Net or Factorial Aerobic Scope? Lessons from the Leaf-Eared Mouse

et al. 2016

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Food availability varies substantially throughout animals' lifespans, thus the ability to profit from high food levels may directly influence animal fitness. Studies exploring the link between basal metabolic rate (BMR), growth, reproduction, and other fitness traits have shown varying relationships in terms of both magnitude and direction. The diversity of results has led to the hypothesis that these relationships are modulated by environmental conditions (e.g., food availability), suggesting that the fitness consequences of a given BMR may be context-dependent. In turn, there is indirect evidence that individuals with an increased capacity for aerobic work also have a high capacity for acquiring energy from food. Surprisingly, very few studies have explored the correlation between maximum rates of energy acquisition and BMR in endotherms, and to the best of our knowledge, none have attempted to elucidate relationships between the former and aerobic capacity [e.g., maximum metabolic rate (MMR), aerobic scope (Factorial aerobic scope, FAS; Net aerobic scope, NAS)]. In this study, we measured BMR, MMR, maximum food intake (recorded under low ambient temperature and ad libitum food conditions; MFI), and estimated aerobic scope in the leaf-eared mouse (Phyllotis darwini). We, then, examined correlations among these variables to determine whether metabolic rates and aerobic scope are functionally correlated, and whether an increased aerobic capacity is related to a higher MFI. We found that aerobic capacity measured as NAS is positively correlated with MFI in endotherms, but with neither FAS nor BMR. Therefore, it appears plausible that the capacity for assimilating energy under conditions of abundant resources is determined adaptively by NAS, as animals with higher NAS would be promoted by selection. In theory, FAS is an invariant measurement of the extreme capacity for energy turnover in relation to resting expenditure, whereas NAS represents the maximum capacity for simultaneous aerobic processes above maintenance levels. Accordingly, in our study, FAS and NAS represent different biological variables; FAS, in contrast to NAS, may not constrain food intake. The explanations for these differences are discussed in biological and mathematical terms; further, we encourage the use of NAS rather than FAS when analyzing the aerobic capacity of animals.

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Section: Discussionsupporting

confidence: 77%

Is Maximum Food Intake in Endotherms Constrained by Net or Factorial Aerobic Scope? Lessons from the Leaf-Eared Mouse

et al. 2016

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“…This is widely recognized among mammalian and avian physiologists, who commonly compare BMR of adult individuals (e.g. Bozinovic et al. 2009).…”

Section: Discussionmentioning

confidence: 99%

Effects of food ration on SMR: influence of food consumption on individual variation in metabolic rate in juvenile coho salmon (Onchorhynchus kisutch)

Leeuwen

Rosenfeld

Richards

2011

Journal of Animal Ecology

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Summary1. Consistency of differences in standard metabolic rate (SMR) between individual juvenile salmonids and the apparently limited ability of individuals to regulate their SMR has led many researchers to conclude that differences in individual SMR are fixed (i.e. genetic). 2. To test for the effects of food ration on individual performance and metabolism, SMR was estimated by measuring oxygen consumption using flow-through respirometry on individually separated young of the year coho salmon (Oncorhynchus kisutch) placed on varying food rations over a period of 44 days. 3. Results demonstrate that the quantity of food consumed directly affects SMR of juvenile coho salmon, independent of specific dynamic action (SDA, an elevation in metabolic rate from the increased energy demands associated with digestion immediately following a meal) and indicates that higher food consumption is a cause of elevated SMR rather than a consequence of it. Juvenile coho salmon therefore demonstrated an ability to regulate their SMR according to food availability and ultimately food consumption. 4. This study indicates that food consumption may play a pivotal role in understanding individual variation in SMR independent of inherent genetic differences. We suggest that studies involving SMR need to be cautious about the effects of intra-individual differences in food consumption in communal tanks or in different microhabitats in the wild as disproportionate food consumption may contribute more to variation in SMR than intrinsic (genetic) factors. 5. In general, our results suggest that evolutionary changes in SMR are likely a response to selection on food consumption and growth, rather than SMR itself.

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“…The ecological physiology of degus populations, in the seasonal Mediterranean and semiarid environment of Chile, indicates that degus’ thermal opportunities for activity shift seasonally/spatially along with the habitat's biotic and abiotic conditions (Bozinovic and Vásquez 1999). Seasonal changes in the availability and quality of food affect foraging, digestion, and nutritional ecology (Bozinovic 1995), as well as the level of seasonal and spatial metabolic expenditure (Bozinovic et al 2009). Such flexibility in the timing of activity allows degus to maintain a thermal homeostasis and energy balance throughout the year and in different localities (Kenagy et al 2002).…”

Section: Uses Of the Degu As An Animal Modelmentioning

confidence: 99%

Octodon degus (Molina 1782): A Model in Comparative Biology and Biomedicine

Ardiles

Ewer

Acosta

et al. 2013

Cold Spring Harb Protoc

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One major goal of integrative and comparative biology is to understand and explain the interaction between the performance and behavior of animals in their natural environment. The Caviomorph, Octodon degus, is a native rodent species from Chile, and represents a unique model to study physiological and behavioral traits, including cognitive and sensory abilities. Degus live in colonies and have a well-structured social organization, with a mostly diurnal–crepuscular circadian activity pattern. More notable is the fact that in captivity, they reproduce and live for between 5 and 7 years and exhibit hallmarks of neurodegenerative diseases (including Alzheimer's disease), diabetes, and cancer.

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Basal metabolism is correlated with habitat productivity among populations of degus (Octodon degus)

Cited by 52 publications

References 27 publications

Is Maximum Food Intake in Endotherms Constrained by Net or Factorial Aerobic Scope? Lessons from the Leaf-Eared Mouse

Is Maximum Food Intake in Endotherms Constrained by Net or Factorial Aerobic Scope? Lessons from the Leaf-Eared Mouse

Effects of food ration on SMR: influence of food consumption on individual variation in metabolic rate in juvenile coho salmon (Onchorhynchus kisutch)

Octodon degus (Molina 1782): A Model in Comparative Biology and Biomedicine

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