Life histories of the Insectivora : the role of phylogeny, metabolism and sex differences

Symonds, Matthew R. E. 1999, Life histories of the Insectivora : the role of phylogeny, metabolism and sex differences, Journal of zoology, vol. 249, no. 3, pp. 315-337.

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Title Life histories of the Insectivora : the role of phylogeny, metabolism and sex differences
Author(s) Symonds, Matthew R. E.
Journal name Journal of zoology
Volume number 249
Issue number 3
Start page 315
End page 337
Publisher Wiley - Blackwell Publishing
Place of publication London, England
Publication date 1999-11
ISSN 0952-8369
1469-7998
Keyword(s) comparative method
Insectivora
life history
phylogenetic error
seasonality
Summary Life-history data for 63 species from the mammalian order Insectivora have been collated from the literature. These data were analysed for covariation and for correlations with body mass, brain mass and mass-specific resting metabolic rate. An independent contrasts method has been used to remove the effect of phylogeny. Due to uncertainties surrounding their evolutionary relationships, 22 different phylogenies of insectivores have been used as a basis for comparative analysis. The results show that several key correlations between life-history variables are only significant when certain phylogenies are used, highlighting the problems of such analyses when the phylogeny used is inaccurate. After removing the effect of phylogeny, relatively few significant correlations remain. Insectivores that have a high body mass have relatively lower metabolic rates, longer lifespans and longer gestation lengths. There is some support for a fast±slow continuum in insectivore life-history evolution: there are some significant positive correlations between measures of growth rates (e.g. gestation length and age at weaning) and lifespan, and some negative correlations between growth rates and measures of reproductive output. It is suggested that the seasonality of life of many insectivores may have played an influential role in the evolution of the group, in particular in delaying the onset of sexual maturity. There is little indication that brain size influences life-history evolution in this order, but metabolism may play an important role. The energetic requirements of maintaining high metabolic rates in small mammals such as insectivores may be constraining life histories to a greater extent than occurs in larger mammals. This effect may have obscured the relationship between metabolic rate and life histories in wider inter-order analyses. Finally, there is considerable evidence that sex differences play a large role in shaping insectivore evolution, and it is suggested that this factor must be considered more often in future studies of mammalian life histories in general.
Language eng
Field of Research 060201 Behavioural Ecology
060203 Ecological Physiology
060308 Life Histories
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©1999, The Zoological Society of London
Persistent URL http://hdl.handle.net/10536/DRO/DU:30039059

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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