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Transpirationsmessungen an den beiden Schabenarten Periplaneta americana und Blaberus trapezoideus

1976; Elsevier BV; Volume: 22; Issue: 7 Linguagem: Inglês

10.1016/0022-1910(76)90076-7

1879-1611

Dieter Coenen-Staß, W. Kloft,

Allergic Rhinitis and Sensitization

The transpiration rate of adult males of the two cockroaches Periplaneta americana and Blaberus trapezoideus has been investigated by weight measurements and a tracer method. Measurements by constant temperature and increasing relative humidities show in both species a reduction of weight loss. In experiments with increasing temperatures and constant vapour pressure, P. americana shows above 30°C a disproportional transpiration increase. The rate of living animals is somewhat lower than of dead ones. This could indicate an active reduction of cuticular permeability. Living species of B. trapezoideus show above 34°C a distinctly increased transpiration rate. In this case living animals show a higher rate than dead animals. The additional increase above 43°C of dead. B. trapezoideus could be regarded, as done by Beament, as an indication of another lipid layer above the cement layer. When the transpiration rates of dead cockroaches were compared as a measure of cuticular permeability, it was found that Periplaneta was more permeable than Blaberus.