Skip to Main Content
Table 2.

Characteristics of the discontinuous gas exchange cycle from the anterior and posterior spiracles of four dung beetle species

P. femoralis
S. gariepinus
S. striatum
C. bacchus*
SpeciesMesothoracic spiraclesPosterior spiraclesMesothoracic spiraclesElytral caseMesothoracic spiraclesElytral caseMesothoracic spiraclesElytral case
Closed period         
   sCO2(μl g-10.16±0.06 0.44±0.24 0.70±0.6 2.64±3.2 6.33±8.8 1.91±1.4 0.57±0.22 — 
   Duration (s) 307.2±102.5  1620.8±1265.3  604.7±187.6  1858.3±917.1 — 
   %DGC duration 20.7±5.5  42.7±16.4  34.2±11.9  42.9±10.4 — 
Flutter period         
   sCO2(μl g-10.60±0.4 4.44±2.6 1.01±0.9 —     
   Duration (s) 496.4±290.1  534.7±353.0      
   %DGC duration 29.0±9.8  17.52±12.4      
Burst period         
   sCO2(μl g-12.40±2.3 35.86±13.7 7.47±3.9 44.26±16.83 14.89±12.5 17.62±12.9 36.1±15.5 — 
   Duration (s) 785.7±288.6  1301±455.4 1836±533.2 1194.7±331.2  2230.4±325.1 — 
   %DGC duration 50.3±5.6  17.5±12.4 57.2±17.5 66.6±11.2  55.2±12.0 — 
P. femoralis
S. gariepinus
S. striatum
C. bacchus*
SpeciesMesothoracic spiraclesPosterior spiraclesMesothoracic spiraclesElytral caseMesothoracic spiraclesElytral caseMesothoracic spiraclesElytral case
Closed period         
   sCO2(μl g-10.16±0.06 0.44±0.24 0.70±0.6 2.64±3.2 6.33±8.8 1.91±1.4 0.57±0.22 — 
   Duration (s) 307.2±102.5  1620.8±1265.3  604.7±187.6  1858.3±917.1 — 
   %DGC duration 20.7±5.5  42.7±16.4  34.2±11.9  42.9±10.4 — 
Flutter period         
   sCO2(μl g-10.60±0.4 4.44±2.6 1.01±0.9 —     
   Duration (s) 496.4±290.1  534.7±353.0      
   %DGC duration 29.0±9.8  17.52±12.4      
Burst period         
   sCO2(μl g-12.40±2.3 35.86±13.7 7.47±3.9 44.26±16.83 14.89±12.5 17.62±12.9 36.1±15.5 — 
   Duration (s) 785.7±288.6  1301±455.4 1836±533.2 1194.7±331.2  2230.4±325.1 — 
   %DGC duration 50.3±5.6  17.5±12.4 57.2±17.5 66.6±11.2  55.2±12.0 — 

`—' Denotes a negligible amount. Data shown are mean ± s.d.

*

From Duncan and Byrne(2002)

Note that these are the measurements for combined closed and flutter periods

Close Modal

or Create an Account

Close Modal
Close Modal