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

2012 ◽  
Vol 215 (19) ◽  
pp. 3388-3393 ◽  
Author(s):  
E. P. Snelling ◽  
P. G. D. Matthews ◽  
R. S. Seymour
Keyword(s):  
Gas Exchange ◽  
Allometric Scaling ◽  
Locusta Migratoria ◽  
Exchange Patterns

scholarly journals Gas exchange patterns and water loss rates in the Table Mountain cockroach, Aptera fusca (Blattodea: Blaberidae)

2013 ◽  
Vol 216 (20) ◽  
pp. 3844-3853 ◽  
Author(s):  
B. Groenewald ◽  
C. S. Bazelet ◽  
C. P. Potter ◽  
J. S. Terblanche
Keyword(s):  
Gas Exchange ◽  
Water Loss ◽  
Table Mountain ◽  
Exchange Patterns ◽  
Loss Rates

scholarly journals Water Costs of Gas Exchange by a Speckled Cockroach and a Darkling Beetle

Insects ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 632
Author(s):  
Waseem Abbas ◽  
Philip C. Withers ◽  
Theodore A. Evans
Keyword(s):  
Body Size ◽  
Gas Exchange ◽  
Metabolic Rate ◽  
Water Loss ◽  
Evaporative Water ◽  
Factors Affecting ◽  
Darkling Beetle ◽  
Terrestrial Insects ◽  
Exchange Patterns ◽  
Respiratory Cost

Respiratory water loss during metabolic gas exchange is an unavoidable cost of living for terrestrial insects. It has been suggested to depend on several factors, such as the mode of gas exchange (convective vs. diffusive), species habitat (aridity), body size and measurement conditions (temperature). We measured this cost in terms of respiratory water loss relative to metabolic rate (respiratory water cost of gas exchange; RWL/V˙CO2) for adults of two insect species, the speckled cockroach (Nauphoeta cinerea) and the darkling beetle (Zophobas morio), which are similar in their mode of gas exchange (dominantly convective), habitat (mesic), body size and measurement conditions, by measuring gas exchange patterns using flow-through respirometry. The speckled cockroaches showed both continuous and discontinuous gas exchange patterns, which had significantly a different metabolic rate and respiratory water loss but the same respiratory water cost of gas exchange. The darkling beetles showed continuous gas exchange pattern only, and their metabolic rate, respiratory water loss and respiratory cost of gas exchange were equivalent to those cockroaches using continuous gas exchange. This outcome from our study highlights that the respiratory water cost of gas exchange is similar between species, regardless of gas exchange pattern used, when the confounding factors affecting this cost are controlled. However, the total evaporative water cost of gas exchange is much higher than the respiratory cost because cuticular water loss contributes considerably more to the overall evaporative water loss than respiratory water. We suggest that the total water cost of gas exchange is likely to be a more useful index of environmental adaptation (e.g., aridity) than just the respiratory water cost.

scholarly journals An experimental evolution study confirms that discontinuous gas exchange does not contribute to body water conservation in locusts

2016 ◽  
Vol 12 (12) ◽  
pp. 20160807 ◽  
Author(s):  
Stav Talal ◽  
Amir Ayali ◽  
Eran Gefen
Keyword(s):  
Gas Exchange ◽  
Water Loss ◽  
Experimental Evolution ◽  
Water Conservation ◽  
Locusta Migratoria ◽  
Body Water ◽  
Evaporative Water ◽  
Migratory Locust ◽  
Evolutionary Response ◽  
Evolution Study

The adaptive nature of discontinuous gas exchange (DGE) in insects is contentious. The classic ‘hygric hypothesis’, which posits that DGE serves to reduce respiratory water loss (RWL), is still the best supported. We thus focused on the hygric hypothesis in this first-ever experimental evolution study of any of the competing adaptive hypotheses. We compared populations of the migratory locust ( Locusta migratoria ) that underwent 10 consecutive generations of selection for desiccation resistance with control populations. Selected locusts survived 36% longer under desiccation stress but DGE prevalence did not differ between these and control populations (approx. 75%). Evolved changes in DGE properties in the selected locusts included longer cycle and interburst durations. However, in contrast with predictions of the hygric hypothesis, these changes were not associated with reduced RWL rates. Other responses observed in the selected locusts were higher body water content when hydrated and lower total evaporative water loss rates. Hence, our data suggest that DGE cycle properties in selected locusts are a consequence of an evolved increased ability to store water, and thus an improved capacity to buffer accumulated CO 2 , rather than an adaptive response to desiccation. We conclude that DGE is unlikely to be an evolutionary response to dehydration challenge in locusts.

Gas exchange patterns of Pterostichus niger (Carabidae) in dry and moist air

2010 ◽  
Vol 36 (1) ◽  
pp. 62-67 ◽  
Author(s):  
IRJA KIVIMÄGI ◽  
AARE KUUSIK ◽  
KATRIN JÕGAR ◽  
ANGELA PLOOMI ◽  
INGRID H. WILLIAMS ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Moist Air ◽  
Exchange Patterns
Sign in / Sign up

Export Citation Format

Share Document