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First published online November 10, 2003

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Repeatability of standard metabolic rate and gas exchange characteristics in a highly variable cockroach, Perisphaeria sp.

Elrike Marais and Steven L. Chown^*

Spatial, Physiological and Conservation Ecology Group, Department of Zoology, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa

View larger version (53K): [in a new window]   Fig. 1. Gas exchange patterns shown by Perisphaeria sp. (Blattodea, Blaberidae). (A) Gas exchange during activity, (B) Continuous gas exchange pattern, (C) Discontinuous gas exchange cycle pattern, (D) Interburst–Burst pattern, (E) Pulsation pattern. In each case, CO2 is shown as the lower curve (left axis) and activity as the upper curve (right axis). Activity is interpreted as the variance of activity about the mean value, rather than the absolute value of this activity. It is negligible except in the case of A.

View larger version (26K): [in a new window]   Fig. 2. Repeatability values (r), and their upper and lower 95% confidence limits for all the components of the cyclic patterns, as well as for the components across patterns. (A) Discontinuous gas exchange cycle pattern, (B) Interburst-Burst pattern, (C) Pulsation pattern, (D) the three gas exchange patterns combined for females only, (E) the three gas exchange patterns combined for males and females, (F) mass, metabolic rate and frequency. Mnemonics are as follows: in A–E, O = O-period, C = C-period, F = F-period, I = Interburst period, B = Burst period, E = emission rate, V = volume, D = duration; in F, M = mass, MRMF = metabolic rate for males and females combined, MRF = metabolic rate for females only, FMF = frequency for males and females combined, FF = frequency for females only.