Scaling of gas exchange cycle frequency in insects

Terblanche, J.S., White, C.R., Blackburn, T.M., Marais, E. and Chown, S.L. (2008) Scaling of gas exchange cycle frequency in insects. Biology Letters, 4 1: 127-129. doi:10.1098/rsbl.2007.0522


Author Terblanche, J.S.
White, C.R.
Blackburn, T.M.
Marais, E.
Chown, S.L.
Title Scaling of gas exchange cycle frequency in insects
Journal name Biology Letters   Check publisher's open access policy
ISSN 1744-9561
Publication date 2008-02-01
Sub-type Article (original research)
DOI 10.1098/rsbl.2007.0522
Open Access Status DOI
Volume 4
Issue 1
Start page 127
End page 129
Total pages 3
Place of publication United Kingdom
Publisher The Royal Society
Language eng
Subject C1
970106 Expanding Knowledge in the Biological Sciences
060604 Comparative Physiology
Abstract Previously, it has been suggested that insect gas exchange cycle frequency (fC) is mass independent, making insects different from most other animals where periods typically scale as mass−0.25. However, the claim for insects is based on studies of only a few closely related taxa encompassing a relatively small size range. Moreover, it is not known whether the type of gas exchange pattern (discontinuous versus cyclic) influences the fC–mass scaling relationship. Here, we analyse a large database to examine interspecific fC–mass scaling. In addition, we investigate the effect of mode of gas exchange on the fC–scaling relationship using both conventional and phylogenetically independent approaches. Cycle frequency is scaled as mass−0.280 (when accounting for phylogeneticnon-independence and gas exchange pattern), which did not differ significantly from mass−0.25. The slope of the fC–mass relationship was shallower with a significantly lower intercept for the species showing discontinuous gas exchange than for those showing the cyclic pattern, probably due to lower metabolic rates in the former. Insects therefore appear no different from other animals insofar as the scaling of gas exchange fC is concerned, although gas exchange fC may scale in distinct ways for different patterns.
Formatted abstract
Previously, it has been suggested that insect gas exchange cycle frequency (fC) is mass independent, making insects different from most other animals where periods typically scale as mass−0.25. However, the claim for insects is based on studies of only a few closely related taxa encompassing a relatively small size range. Moreover, it is not known whether the type of gas exchange pattern (discontinuous versus cyclic) influences the fC–mass scaling relationship. Here, we analyse a large database to examine interspecific fC–mass scaling. In addition, we investigate the effect of mode of gas exchange on the fC–scaling relationship using both conventional and phylogenetically independent approaches. Cycle frequency is scaled as mass−0.280 (when accounting for phylogeneticnon-independence and gas exchange pattern), which did not differ significantly from mass−0.25. The slope of the fC–mass relationship was shallower with a significantly lower intercept for the species showing discontinuous gas exchange than for those showing the cyclic pattern, probably due to lower metabolic rates in the former. Insects therefore appear no different from other animals insofar as the scaling of gas exchange fC is concerned, although gas exchange fC may scale in distinct ways for different patterns.
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Biological Sciences Publications
 
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Created: Wed, 25 Mar 2009, 20:58:41 EST by Gail Walter on behalf of School of Biological Sciences