Abstract
Body temperatures, critical thermal minima and the daily variation in heat resistance are reported for Bufo marinus in Queensland. Body temperatures ranged from 17.0 to 27.2 C (mean 21.3 t+ 2.4 C) with only 30.9 per cent of the observations exceeding ambient. The critical thermal minimum was 6.1 C (range 5.0-7.5 C) and is lower than previously reported values for B. marinus from Central America. The onset of spasms (range 37.8-39.5 C) varied significantly over a 24 hr period and appeared to show a temporal pattern in heat resistance for which the functional significance is unknown at present, but possibly has survival value for this toad during the breeding season. * * *
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