Journal of Comparative Physiology B

, Volume 184, Issue 8, pp 1041–1053 | Cite as

Effects of reproductive status and high ambient temperatures on the body temperature of a free-ranging basoendotherm

  • Danielle L. Levesque
  • Kerileigh D. Lobban
  • Barry G. Lovegrove
Original Paper

Abstract

Tenrecs (Order Afrosoricida) exhibit some of the lowest body temperatures (Tb) of any eutherian mammal. They also have a high level of variability in both active and resting Tbs and, at least in cool temperatures in captivity, frequently employ both short- and long-term torpor. The use of heterothermy by captive animals is, however, generally reduced during gestation and lactation. We present data long-term Tb recordings collected from free-ranging S. setosus over the course of two reproductive seasons. In general, reproductive females had slightly higher (~32 °C) and less variable Tb, whereas non-reproductive females and males showed both a higher propensity for torpor as well as lower (~30.5 °C) and more variable rest-phase Tbs. Torpor expression defined using traditional means (using a threshold or cut-off Tb) was much lower than predicted based on the high degree of heterothermy in captive tenrecs. However, torpor defined in this manner is likely to be underestimated in habitats where ambient temperature is close to Tb. Our results caution against inferring metabolic states from Tb alone and lend support to the recent call to define torpor in free-ranging animals based on mechanistic and not descriptive variables. In addition, lower variability in Tb observed during gestation and lactation confirms that homeothermy is essential for reproduction in this species and probably for basoendothermic mammals in general. The relatively low costs of maintaining homeothermy in a sub-tropical environment might help shed light on how homeothermy could have evolved incrementally from an ancestral heterothermic condition.

Keywords

Evolution of endothermy Parental care Thermoregulation Reproduction Heterothermy Torpor Madagascar Tropics Setifer setosus Tenrec 

Abbreviations

Ta

Ambient temperature measured via a black body apparatus

Tb

Core body temperature

Tsoil

Ambient temperature measured at a depth of 250 mm below the surface

Ttree

Ambient temperature measured in a tree cavity

T

Temperature differential (Tb − Ta)

Tbmax

Average of the 5 highest Tb data for each day

Tbmin

Average of the 5 lowest Tb data for each day

Tb

Difference between the daily maximum and minimum Tb

Notes

Acknowledgments

All procedures involving the use of animals were approved by the Madagascar National Parks (Permit 218/09/MEF/SG/DGF/DCB.SAP/SLRSE and 158/10/MEF/SG/DGF/DCB.SAP/SCBSE) and comply with all national Malagasy laws. We wish to thank the following individuals and institutions for their assistance: C.I. Canale for help with the Tb analysis spreadsheets, Prof. D. Rakotondravony (Département de Biologie Animale, Université d’Antananarivo), the local guides (Tosy, Alpha and Ndrema), Oliva Malala Loavasoa Andriambola, Sophie Nirina Rakotoharimala, Christophe Bouvier, the Malagasy National Parks, and the Malagasy Institute for the Conservation of Tropical Environments. We are grateful to Dr. Akiro Mori, Kyoto University, for extracting one of the transmitters from a boa without harm to the snake. The research was funded through an Ad Hoc Travel Grant, an incentive grant, and a competitive grant, from the National Research Foundation (South Africa), and from incentive grants from the University of KwaZulu-Natal, to BGL. A generous donation was received from Idea Wild for the purchase of GPS units. DLL was funded by the above-mentioned grants, as well as a National Science and Engineering Research Council (Canada) postgraduate scholarship.

Supplementary material

360_2014_858_MOESM1_ESM.docx (18 kb)
Supplementary material 1 (DOCX 18 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Danielle L. Levesque
    • 1
    • 2
  • Kerileigh D. Lobban
    • 2
  • Barry G. Lovegrove
    • 2
  1. 1.Institute of Biodiversity and Environmental ConservationUniversiti Malaysia SarawakKota SamarahanMalaysia
  2. 2.School of Life SciencesUniversity of KwaZulu-NatalScottsvilleSouth Africa

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