Thermal biology of Bubas bubalus (Olivier 1811) (Coleoptera: Scarabaeidae).
Boletín Sociedad Entomológica Aragonesa, 32: 21 - 28.

Javier MENA


The crepuscular dung beetle Bubas bubalus (Ol., 1811)(Coleoptera, Scarabaeidae) is a medium sized beetle (ranging: 0,2 - 0,9 g) and it can be found in the dung pads since October to July in the Iberian Peninsula. After dusk, adults of B. bubalus experienced body temperatures elevated above ambient temperature. Taking off, beetles kept thoracic temperatures (Tth) between 27°C and 35,6°C. The minimum and maximum thoracic temperature for sustained flight was about 28,1°C and 36,2°C respectively. Regression lines of Tth on air temperature (Ta) at taking off and flying were both significantly different from 0 and 1. At rest, however, the body temperatures of the beetles did not differ significantly from those of the surroundings, soil or dung (the slope of the regression Tth vs Ta was not significantly different from 1). The ecological implications of endothermy ability in B. bubalus are discussed.

Keywords: Coleoptera, Scarabaeidae, Bubas, dung beetle, endothermy, thermoregulation, Mediterranean area.


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