Allometric scaling of discontinuous gas exchange patterns in the locust Locusta migratoria throughout ontogeny

Snelling, Edward P., Matthews, Philip G. D. and Seymour, Roger S. (2012) Allometric scaling of discontinuous gas exchange patterns in the locust Locusta migratoria throughout ontogeny. Journal of Experimental Biology, 215 19: 3388-3393.


Author Snelling, Edward P.
Matthews, Philip G. D.
Seymour, Roger S.
Title Allometric scaling of discontinuous gas exchange patterns in the locust Locusta migratoria throughout ontogeny
Journal name Journal of Experimental Biology   Check publisher's open access policy
ISSN 0022-0949
1477-9145
Publication date 2012-10
Sub-type Article (original research)
DOI 10.1242/jeb.072769
Volume 215
Issue 19
Start page 3388
End page 3393
Total pages 6
Place of publication Cambridge, United Kingdom
Publisher The Company of Biologists
Collection year 2013
Language eng
Formatted abstract The discontinuous gas exchange cycle (DGC) is a three-phase breathing pattern displayed by many insects at rest. The pattern consists of an extended breath-hold period (closed phase), followed by a sequence of rapid gas exchange pulses (flutter phase), and then a period in which respiratory gases move freely between insect and environment (open phase). This study measured CO 2 emission in resting locusts Locusta migratoria throughout ontogeny, in normoxia (21 kPa P O2), hypoxia (7 kPa P O2) and hyperoxia (40 kPa P O2), to determine whether body mass and ambient O 2 affect DGC phase duration. In normoxia, mean CO 2 production rate (ṀCO 2; μmol h -1) scales with body mass (M b; g) according to the allometric power equation Ṁ CO2=9.9M b 0.95±0.09, closed phase duration (C; min) scales with body mass according to the equation C=18.0M b 0.38±0.29, closed+flutter period (C+F; min) scales with body mass according to the equation C+F=26.6M b 0.20±0.25 and open phase duration (O; min) scales with body mass according to the equation O=13.3M b 0.23±0.18. Hypoxia results in a shorter C phase and longer O phase across all life stages, whereas hyperoxia elicits shorter C, C+F and O phases across all life stages. The tendency for larger locusts to exhibit longer C and C+F phases might arise if the positive allometric scaling of locust tracheal volume prolongs the time taken to reach the minimum O 2 and maximum CO 2 set-points that determine the duration of these respective periods, whereas an increasingly protracted O phase could reflect the additional time required for larger locusts to expel CO 2 through a relatively longer tracheal pathway. Observed changes in phase duration under hypoxia possibly serve to maximise O2 uptake from the environment, whereas the response of the DGC to hyperoxia is difficult to explain, but could be affected by elevated levels of reactive oxygen species.
Keyword Allometry
Discontinuous gas exchange
Insect
Locust
Respiration
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
School of Biological Sciences Publications
 
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