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Production of metabolic gases by nests of the termite Macrotermes jeanneli in Kenya

Published online by Cambridge University Press:  10 July 2009

J. P. E. C. Darlington ,
P. R. Zimmerman ,
J. Greenberg ,
C. Westberg  and
P. Bakwin
J. P. E. C. Darlington
Affiliation:
National Center for Atmospheric Research (NCAR), P.O. Box 3000, Boulder, Colorado 80307, U.S.A.
P. R. Zimmerman
Affiliation:
National Center for Atmospheric Research (NCAR), P.O. Box 3000, Boulder, Colorado 80307, U.S.A.
J. Greenberg
Affiliation:
National Center for Atmospheric Research (NCAR), P.O. Box 3000, Boulder, Colorado 80307, U.S.A.
C. Westberg
Affiliation:
National Center for Atmospheric Research (NCAR), P.O. Box 3000, Boulder, Colorado 80307, U.S.A.
P. Bakwin
Affiliation:
National Center for Atmospheric Research (NCAR), P.O. Box 3000, Boulder, Colorado 80307, U.S.A.
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Abstract

Nests of a fungus-growing termite Macrotermes jeanneli discharge all their metabolic gases through a single outlet to the atmosphere. This made it possible to measure the production of metabolic gases, and the rates of water loss, for intact nests in the field. Rates of production of carbon dioxide and methane from isolated nest components (different termite castes and intact fungus combs) were measured. Using previously published nest population data and fungus comb weights in relation to nest size, the expected gas production rates for intact nests were calculated. These estimates were compared with direct observations of the gaseous outflow from intact nests. The rates were in reasonable agreement, but some nests emitted excess carbon dioxide, probably produced by respiration of tree roots and non-termite soil organisms. Large nests may have a total gas outflow of 100,000 to 400,000 1 d–1 including 800 to 1500 1 d–1 of CO2 and 0.5 to 1.3 1 d–1 of CH4. Nests lose water at the rate of up, to 13 1 d–1 gross, but allowing for ambient humidity the net water loss was up to about 5 1 d–1. Some of this is metabolic water, but the larger proportion comes from the soil. Area-based estimates of gas production were made for this and two other species of Macrotermes, but they are not accurate because the field distribution and mound density are not adequately known.

Keywords

carbon dioxidediurnal cyclesfungus-growing termitesheatmethanenestsventilationwater
Type
Research Article
Information
Journal of Tropical Ecology , Volume 13 , Issue 4 , July 1997 , pp. 491 - 510
Copyright
Copyright © Cambridge University Press 1997

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