oa Journal of the Entomological Society of Southern Africa - Oxygen consumption and haemocyanin oxygen affinity in the scorpion Opisthophthalmus latimanus Koch



The oxygen consumption rate of adult Opisthophthalmus latimanus is 4,2 ± 0,8 mmol/l/h/g (96 ± 17,9 microlitres/h/g) at 25°C with Q 10 values of 2,4 between 15°C and 25°C and 1,57 between 25°C and 35°C. The pH of centrifuged haemolymph (concentration: 1 15 ± 7,5 mg/ml) is 7,43 ± 0,09 at 25°C. The ionic composition found in the Indian scorpion (Padmanabhanaidu, 1966b) is the same in O. latimanus. The Mg and total carbon dioxide concentrations are 1,80 ± 0,2 mmol/l and 6,5 ± 0,2 mmol/l respectively. Sub-unit co-operativety of the haemocyanin molecule was significantly increased and haemocyanin affinity significantly decreased by rising temperatures. From the results it can be concluded that the respiration physiology in O. lalimanus is suppressed at high temperature regimes (25°C-35°C).


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