Thermal responses of an insect subjected to temperature variations |
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Authors: | Andre Buatois Jean Paul Croze |
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Institution: | Laboratoire de Biométrie, et Institut Universitaire de Technologie, Département de Biologie Générale et Appliquée, Université Lyon I, 43 Bd du 11 Novembre 1918, 69621, Villeurbanne France |
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Abstract: | Temperature responses of the cockroach, Blaberus craniifer, to rapid changes of ambient temperature (Ta) have been studied. In static conditions at Ta = 27°C the body-to-ambient temperature difference was only 0.10 ± 0.07°C. Two test situations were used, either a ramp increase of Ta from 27 to 31°C (0.1°C/min) or “step” changes from 27 to 28°C and back (0.5°C/min). In both cases body temperature closely followed Newtonian model, the body time constants measured in various conditions being very similar: 543 ± 99 sec in ramp tests, 550 ± 68 sec and 542 ± 124 sec in rising and falling step tests respectively. It is concluded that in spite of evident differences between the cockroach and an inert solid, the Newtonian model adequately represents the thermal responses of this insect to moderate changes in ambient temperature. |
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Keywords: | ectotherms poikilotherms Influence of temperature on insects environmental temperature |
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