Oxygen consumption, carbon dioxide excretion and respiratory quotient of larval lampreys (Mordacia mordax) in air.
The standard rates of O2 consumption of larval Mordacia mordax (weight range 1.3-2.3 g), after these ammocetes had been in humidified air for 18 hr, were 26.8, 46.3 and 71.2 microL x g(-1) x hr(-1) at 10, 15 and 20 degrees C, respectively. The corresponding rates of CO2 excretion were 20.7, 35.6 and 54.1 microL x g(-1) x hr(-1). The RQs at the three temperatures were essentially identical (0.76 or 0.77) and similar to that of adults of the lamprey Geotria australis in air at 15 degrees C. The above RQs for ammocoetes, which are probably similar to those that would be recorded in water, are consistent with the view that the aerobic respiration of these animals relies predominantly on lipid as an energy source, but that some energy is derived from carbohydrate and/or protein. The RQs for larval and adult lampreys in air lie well within the range recorded for amphibious fishes in air.
School of Biological Sciences, Murdoch University, Western Australia, Australia. i-potter@possum.murdoch.edu.au
I C
IC
Potter
D J
DJ
Macey
A R
AR
Roberts
P C
PC
Withers
D000388:Air; D000818:Animals; D002245:Carbon Dioxide / Q000378:metabolism*; D019069:Cell Respiration / Q000502:physiology; D007798:Lampreys / Q000502:physiology*; D007814:Larva / Q000502:physiology; D010101:Oxygen Consumption / Q000502:physiology*; D013696:Temperature
D002245:Carbon Dioxide