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Physiological adaptations in Coleoptera on Spitsbergen

Authors:	JOHN ALEXANDER STRøMME THOMAS WANJOHI NGARI KARL ERIK ZACHARIASSEN

Institution:	John Alexander Strømme and Karl Erik Zachariassen, Department of Zoology, University of Trondheim, 7055 Dragvoll, Norway;Thomas Wanjohi Ngari, Department of Geography, University of Trondheim, 7055 Dragvoll, Norway;December 1985 (revised July 1986).

Abstract:	Metabolic rates and Q₁₀ values were determined for three species of Spitsbergen Coleoptera, Amara quenseli, Simplocaria metallica and Rhynchaenus flagellum . The beetles had metabolic rates which were elevated compared to values of Coleoptera from other regions. This is interpreted as an adaptation to the prevailing low temperatures and short activity period on Spitsbergen. A. quenseli had rates of water loss comparable to values of beetles in temperate and tropical xeric habitats, indicating that the habitat of the beetles on Spitsbergen at least occasionally is xeric. Determination of cold-hardiness parameters such as supercooling point and haemolymph melting point of A. quenseli beetles revealed that the beetles had values corresponding to those of active insects in the temperate and tropical region. They had no thermal hysteresis factors. Thus, during summer they show no physiological adaptations to cold.

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