Simultaneous measurement of oxygen uptake and carbon dioxide emission during discontinuous ventilation in the tok-tok beetle, Psammodes striatus

摘要: Abstract Rates of oxygen uptake and carbon dioxide emission during cycles discontinuous ventilation by the tok-tok beetle, Psammodes striatus , were measured with computerized flowthrough respirometry. Mean long-term rates (LVO 2 ) (LVCO 0.160 ml g −1 h 0.130 respectively (mean > = 10 in each 8 beetles, mean mass 2.80 g). RQ over entire cycle was 0.83. During closed-spiracle (closed) phase cycle, exchange declined to very low levels. fluttering-spiracle (flutter) phase, short-term VO (SVO increased ∼ LVO thus meeting tissue requirements, while VCO (SVCO only 13% LVCO . The flutter respiratory ratio 0.15. open-spiracle this 1.27, 228% peaked rapidly then settled a second plateau marginally above Abdominal pulsations invariably occurred open cost 2% total uptake. accounted for 33.9% 63.9% uptake; terms emission, phases 5.7 93.1%, respectively.