A Single Origin of Heterothermy in Mammals

  • Barry G. Lovegrove


Some mammal lineages survived the global fires that occurred in the hours following the asteroid impact at Chicxulub, Yucatan, at the Cretaceous/Tertiary Boundary (K/T Boundary) 65 mya. Several studies have proposed that it was the capacity for torpor and refuge underground, in tree holes, caves, and underwater, that ensured the short- and long-term survival of the post-impact conditions. Here I test the hypothesis that heterothermy was a pleisiomorphic condition in ancestral mammals which allowed certain mammal lineages to survive the K/T Boundary. I employed a maximum likelihood approach to reconstruct the likely heterothermic status of the last mammalian ancestor. With our current knowledge, the probability of heterothermy (58%) slightly exceeds that of no heterothermy. However, if some mammals that have yet to be studied, but which have been identified as highly likely heterotherms, are scored as heterotherms, the proportional likelihood of heterothermy in ancestral mammals exceeds the 96% probability. At the least, these data confirm that there was single origin of heterothermy in mammals, but further research is required to determine how extensive heterothermy was in Mesozoic mammals.


Placental Mammal Tree Shrew Close Phylogenetic Relationship Daily Torpor Arctic Ground Squirrel 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The research was financed by incentive grants from the University of KwaZulu-Natal and the National Research Foundation, South Africa.


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© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.School of Life SciencesUniversity of KwaZulu-NatalScottsvilleSouth Africa

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