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Respiratory metabolism of Hydromedion sparsutum and Perimylops antarcticus (Col., Perimylopidae) from South Georgia
Authors:L Sømme  R A Ring  W Block  M R Worland
Institution:(1) Department of Biology, Division of Zoology, University of Oslo, Blindern, P.O. Box 1050, N-0316, Oslo 3, Norway;(2) Department of Biology, University of Victoria, P.O. Box 1700, V8W 2Y2 Victoria, British Columbia, Canada;(3) British Antarctic Survey, High Cross, Madingley Road, CB3 OET Cambridge, UK
Abstract:Summary Metabolic rates were studied in adults and larvae of the two phytophagous beetles Hydromedion sparsutum and Perimylops antarcticus (Col., Perimylopidae) indigenous to the Sub-Antarctic island of South Georgia. From the regression lines for log10 metabolic rate on temperature no difference in oxygen consumption was found between adults and larvae of Hydromedion or adults of Perimylops from lower sites near sea level and upper sites at about 200 m. Elevated rates of metabolism, however, was found in larvae of Perimylops from upper sites. The slopes of the regression lines of corresponding upper and lower sites adults or larvae were similar in all cases. The metabolic rates were of the same level in adults of both species and in the larvae, but generally higher in adults than in larvae. The activation energies, calculated from Arrhenius plots, varied from 6.7 to 13.6 kcal.mol–1 in larvae and from 10.7 to 11.3 kcal.mol–1 in adults. The low values may be interpreted as an expression of cold adapted metabolism. Compared with published data on phytophagous beetles, the metabolic rates of the two species from South Georgia are comparable to two alpine species, but lower than the rates of an Arctic species.
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