Journal of Comparative Physiology B

, Volume 160, Issue 5, pp 573–581 | Cite as

Capacity for sustained terrestrial locomotion in an insect: Energetics, thermal dependence, and kinematics

  • Robert J. Full
  • Alexa Tullis
Article

Summary

The capacity for sustained, terrestrial locomotion in the cockroach. Blaberus discoidalis, was determined in relation to running speed, metabolic cost, aerobic capacity, and ambient temperature (Ta=15, 23, and 34°C; acclimation temperature=24°C). Steady-state thoracic temperature (Ttss) increased linearly with speed at each Ta.The difference between Ttss and Tawas similar at each experimental temperature with a maximum increase of 7°C. Steady-state oxygen consumption (VO2ss) increased linearly with speed at each Taand had a low thermal dependence (Q10=1.0-1.4). The minimum cost of locomotion (the slope of the VO2ss versus speed function) was independent of Ta.Cockroaches attained a maximal oxygen consumption (VO2max). increased with Tafrom 2.1 ml O2·g-1·h-1 at 15°C to 4.9 ml O2·g-1·h-1 at 23°C, but showed no further increase at 34°C, VO2max increased 23-fold over resting VO2 at 23°C, 10-fold at 34°C, and 15-fold at 15°C. Endurance correlated with the speed at which VO2max was attained (MAS, maximal aerobic speed). Temperature affected the kinematics of locomotion. compared to cockroaches running at the same speed, but higher temperatures (23–34°C), low temperature (15°C) increased protraction time, reduced stride frequency, and reduced stability by increasing body pitching. The thermal independence of the minimum cost of locomotion (Cmin), the low thermal dependence of VO2ss (i.e., y-intercept of the VO2ss versus speed function), and a typical Q10 of 2.0 for VO2max combined to increase MAS and endurance in B. discoidalis when Tawas increased from 15 to 23°C. Exerciserelated endothermy enabled running cockroaches to attain a greater VO2max, metabolic scope, and endurance capacity at 23°C than would be possible if Ttss remained equal to Ta. The MAS of B. discoidalis was similar to that of other arthropods that use trachea, but was 2-fold greater than ectotherms, such as salamanders, frogs, and crabs of a comparable body mass.

Key words

Endurance Locomotion Energetics Temperature Insects 

Abbreviations

Ta

ambient temperature

Tt

thoracic temperature

Ttss

steady state thoracic temperature during exercise

Ttrest

thoracic temperature during rest

VO2

oxygen consumption

VO2rest

oxygen consumption during rest

VO2ss

steady-state oxygen consumption during exercise

VO2max

maximal oxygen consumption; MAS maximum aerobic speed

Cmin

minimum cost of locomotion

tend

endurance time

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • Robert J. Full
    • 1
  • Alexa Tullis
    • 1
  1. 1.Department of Integrative BiologyUniversity of California at BerkeleyBerkeleyUSA

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