Energy expenditure in Crocidurinae shrews (Insectivora): Is metabolism a key component of the insular syndrome? - Archive ouverte HAL Access content directly
Journal Articles Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology Year : 2005

Energy expenditure in Crocidurinae shrews (Insectivora): Is metabolism a key component of the insular syndrome?

(1, 2) , (1, 2) , (3) , (4)
1
2
3
4

Abstract

A cascade of morphological, ecological, demographical and behavioural changes operates within island communities compared to mainland. We tested whether metabolic rates change on islands. Using a closed circuit respirometer, we investigated resting metabolic rate (RMR) of three species of Crocidurinae shrews: Suncus etruscus, Crocidura russula, and C. suaveolens. For the latter, we compared energy expenditure of mainland and island populations. Our measurements agree with those previously reported for others Crocidurinae: the interspecific comparison (ANCOVA) demonstrated an allometric relation between energy requirements and body mass. Energy expenditure also scaled with temperature. Island populations (Corsica and Porquerolles) of C suaveolens differed in size from mainland (gigantism). A GLM showed a significant relationship between energy expenditure, temperature, body mass and locality. Mass specific RMR allometrically scales body mass, but total RMR does not significantly differ between mainland and island, although island shrews are giant. Our results are consistent with other studies: that demonstrated that the evolution of mammalian metabolism on islands is partially independent of body mass. In relation to the insular syndrome, we discuss how island selective forces (changes in resource availability, decrease in competition and predation pressures) can operate in size and physiological adjustments.
Not file

Dates and versions

hal-03884419 , version 1 (05-12-2022)

Identifiers

Cite

Elodie Magnanou, Roger Fons, Jacques Blondel, Serge Morand. Energy expenditure in Crocidurinae shrews (Insectivora): Is metabolism a key component of the insular syndrome?. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 2005, 142 (3), pp.276-285. ⟨10.1016/j.cbpb.2005.07.006⟩. ⟨hal-03884419⟩
0 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More