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Adjusting energy expenditures to energy supply: food availability regulates torpor use and organ size in the Chilean mouse-opossum Thylamys elegans

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Abstract

We studied how food abundance and consumption regulates torpor use and internal organ size in the Chilean mouse-opossum Thylamys elegans (Dielphidae), a small nocturnal marsupial, endemic in southern South America. We predicted that exposure to food rations at or above the minimum energy levels necessary for maintenance would not lead to any signs of torpor, while reducing food supply to energy levels below maintenance would lead to marked increases in frequency, duration and depth of torpor bouts. We also analyzed the relationship between food availability and internal organ mass. We predicted a positive relationship between food availability and internal organ size once the effect of body size is removed. Animals were randomly assigned to one of two groups and fed either 70, 100 or 130% of their daily energy requirement (DER). We found a positive and significant correlation between %DER and body temperature, and also between %DER and minimum body temperature. In contrast, for torpor frequency, duration and depth, we found a significant negative correlation with %DER. Finally, we found a significant positive correlation between the %DER and small intestine and ceacum dry mass. We demonstrate that when food availability is limited, T. elegans has the capacity to reduce their maintenance cost by two different mechanisms, that is, increasing the use of torpor and reducing organ mass.

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Abbreviations

DER:

Daily energy requirement

T b :

Mean body temperature

T bmin :

Minimum daily body temperature

Torporfreq :

Mean number of torpor bout per day

T btorpor :

Mean temperature during torpor events

T s :

Skin surface temperature

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Acknowledgments

Funded by FONDAP 1501-0001 (program 1) to FB and FONDECYT 3060046 to DEN. Two anonymous reviewers made valuable comments.

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Authors and Affiliations

  1. Center for Advanced Studies in Ecology and Biodiversity and Departamento de Ecología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, 6513677, Chile

    Francisco Bozinovic, José L. P. Muñoz & Daniel E. Naya

  2. Departamento de Zoologia, Instituto de Biociências, UNESP, Rio Claro, CP 199, SP, Brasil

    Ariovaldo P. Cruz-Neto

Authors
  1. Francisco Bozinovic
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  2. José L. P. Muñoz
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  3. Daniel E. Naya
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  4. Ariovaldo P. Cruz-Neto
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Corresponding author

Correspondence to Francisco Bozinovic.

Additional information

Communicated by I.D. Hume.

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Bozinovic, F., Muñoz, J.L.P., Naya, D.E. et al. Adjusting energy expenditures to energy supply: food availability regulates torpor use and organ size in the Chilean mouse-opossum Thylamys elegans . J Comp Physiol B 177, 393–400 (2007). https://doi.org/10.1007/s00360-006-0137-0

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  • DOI: https://doi.org/10.1007/s00360-006-0137-0

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